Tag Archives: FFmpeg

How to record a video of Amazon AppStream 2.0 streaming sessions

Post Syndicated from Nicolas Malaval original https://aws.amazon.com/blogs/security/how-to-record-video-of-amazon-appstream-2-0-streaming-sessions/

Amazon AppStream 2.0 is a fully managed service that lets you stream applications and desktops to your users. In this post, I’ll show you how to record a video of AppStream 2.0 streaming sessions by using FFmpeg, a popular media framework.

There are many use cases for session recording, such as auditing administrative access, troubleshooting user issues, or quality assurance. For example, you could publish administrative tools with AppStream 2.0, such as a Remote Desktop Protocol (RDP) client, to protect access to your backend systems (see How to use Amazon AppStream 2.0 to reduce your bastion host attack surface) and you may want to record a video of what your administrators do when accessing and operating backend systems. You may also want to see what a user did to reproduce an issue, or view activities in a call center setting, such as call handling or customer support, for review and training.

This solution is not designed or intended for people surveillance, or for the collection of evidence for legal proceedings. You are responsible for complying with all applicable laws and regulations when using this solution.

Overview and architecture

In this section, you can learn about the steps for recording AppStream 2.0 streaming sessions and see an overview of the solution architecture. Later in this post, you can find instructions about how to implement and test the solution.

AppStream 2.0 enables you to run custom scripts to prepare the streaming instance before the applications launch or after the streaming session has completed. Figure 1 shows a simplified description of what happens before, during and after a streaming session.

Figure 1: Solution architecture

Figure 1: Solution architecture

  1. Before the streaming session starts, AppStream 2.0 runs script A, which uses PsExec, a utility that enables administrators to run commands on local or remote computers, to launch script B. Script B then runs during the entire streaming session. PsExec can run the script as the LocalSystem account, a service account that has extensive privileges on a local system, while it interacts with the desktop of another session. Using the LocalSystem account, you can use FFmpeg to record the session screen and prevent AppStream 2.0 users from stopping or tampering with the solution, as long as they aren’t granted local administrator rights.
  2. Script B launches FFmpeg and starts recording the desktop. The solution uses the FFmpeg built-in screen-grabber to capture the desktop across all the available screens.
  3. When FFmpeg starts recording, it captures the area covered by the desktop at that time. If the number of screens or the resolution changes, a portion of the desktop might be outside the recorded area. In that case, script B stops the recording and starts FFmpeg again.
  4. After the streaming session ends, AppStream 2.0 runs script C, which notifies script B that it must end the recording and close. Script B stops FFmpeg.
  5. Before exiting, script B uploads the video files that FFmpeg generated to Amazon Simple Storage Service (Amazon S3). It also stores user and session metadata in Amazon S3, along with the video files, for easy retrieval of session recordings.

For a more comprehensive understanding of how the session scripts works, you can refer to the GitHub repository that contains the solution artifacts, where I go into the details of each script.

Implementing and testing the solution

Now that you understand the architecture of this solution, you can follow the instructions in this section to implement this blog post’s solution in your AWS account. You will:

  1. Create a virtual private cloud (VPC), an S3 bucket and an AWS Identity and Access Management (IAM) role with AWS CloudFormation.
  2. Create an AppStream 2.0 image builder.
  3. Configure the solution scripts on the image builder.
  4. Specify an application to publish and create an image.
  5. Create an AppStream 2.0 fleet.
  6. Create an AppStream 2.0 stack.
  7. Create a user in the AppStream 2.0 user pool.
  8. Launch a streaming session and test the solution.

Step 1: Create a VPC, an S3 bucket, and an IAM role with AWS CloudFormation

For the first step in the solution, you create a new VPC where AppStream 2.0 will be deployed, or choose an existing VPC, a new S3 bucket to store the session recordings, and a new IAM role to grant AppStream 2.0 the necessary IAM permissions.

To create the VPC, the S3 bucket, and the IAM role with AWS CloudFormation

  1. Select the following Launch Stack button to open the CloudFormation console and create a CloudFormation stack from the template. You can change the Region where resources are deployed in the navigation bar.
    Select the Launch Stack button to launch the template

    The latest template can also be downloaded on GitHub.

  2. Choose Next. For VPC ID, Subnet 1 ID and Subnet 2 ID, you can optionally select a VPC and two subnets, if you want to deploy the solution in an existing VPC, or leave these fields blank to create a new VPC. Then follow the on-screen instructions. AWS CloudFormation creates the following resources:
    • (If you chose to create a new VPC) An Amazon Virtual Private Cloud (Amazon VPC) with an internet gateway attached.
    • (If you chose to create a new VPC) Two public subnets on this Amazon VPC with a new route table to make them publicly accessible.
    • An S3 bucket to store the session recordings.
    • An IAM role to grant AppStream 2.0 permissions to upload video and metadata files to Amazon S3.
  3. After the stack creation has completed, choose the Outputs tab in the CloudFormation console and note the values that the process returned: the name and Region of the S3 bucket, the name of the IAM role, the ID of the VPC, and the two subnets.

Step 2: Create an AppStream 2.0 image builder

The next step is to create a new AppStream 2.0 image builder. An image builder is a virtual machine that you can use to install and configure applications for streaming, and then create a custom image.

To create the AppStream 2.0 image builder

  1. Open the AppStream 2.0 console and select the Region in the navigation bar. Choose Get Started then Skip if you are new to the console.
  2. Choose Images in the left pane, and then choose Image Builder. Choose Launch Image Builder.
  3. In Step 1: Choose Image:
    1. Select the name of the latest AppStream 2.0 base image for the Windows Server version of your choice. You can find its name in the AppStream 2.0 base image version history. For example, at the time of writing, the name of the latest Windows Server 2019 base image is AppStream-WinServer2019-07-16-2020.
    2. Choose Next.
  4. In Step 2: Configure Image Builder:
    1. For Name, enter session-recording.
    2. For Instance Type, choose stream.standard.medium.
    3. For IAM role, select the IAM role that AWS CloudFormation created.
    4. Choose Next.
  5. In Step 3: Configure Network:
    1. Choose Default Internet Access to provide internet access to your image builder.
    2. For VPC, select the ID of the VPC, and for Subnet 1, select the ID of Subnet 1.
    3. For Security group(s), select the ID of the security group. Refer back to the Outputs tab of the CloudFormation stack if you are unsure which VPC, subnet and security group to select.
    4. Choose Review.
  6. In Step 4: Review, choose Launch.

Step 3: Configure the solution scripts on the image builder

The session scripts to run before streaming sessions start or after sessions end are specified within an AppStream 2.0 image. In this step, you install the solution scripts on your image builder and specify the scripts to run in the session scripts configuration file.

To configure the solution scripts on the image builder

  1. Wait until the image builder is in the Running state, and then choose Connect.
  2. Within the AppStream 2.0 streaming session, on the Local User tab, choose Administrator.
  3. To install the solution scripts:
    1. From the image builder desktop, choose Start in the Windows taskbar.
    2. Open the context (right-click) menu for Windows PowerShell, and then choose Run as Administrator.
    3. Run the following commands in the PowerShell terminal to create the required folders, and to copy the solution scripts and the session scripts configuration file from public objects in GitHub to the local disk. If you aren’t using Google Chrome or the AppStream 2.0 client, you need to choose the Clipboard icon in the AppStream 2.0 navigation bar, and then select Paste to remote session.
      New-Item -Path C:\SessionRecording -ItemType directory
      New-Item -Path C:\SessionRecording\Scripts -ItemType directory
      New-Item -Path C:\SessionRecording\Output -ItemType directory
      New-Item -Path C:\SessionRecording\Bin -ItemType directory
      $Acl = Get-Acl C:\SessionRecording
      $AccessRule1 = New-Object System.Security.AccessControl.FileSystemAccessRule("Administrators","FullControl","ContainerInherit,ObjectInherit","None","Allow")
      $AccessRule2 = New-Object System.Security.AccessControl.FileSystemAccessRule("SYSTEM","FullControl","ContainerInherit,ObjectInherit","None","Allow")
      $AccessRule3 = New-Object System.Security.AccessControl.FileSystemAccessRule("ImageBuilderAdmin","FullControl","ContainerInherit,ObjectInherit","None","Allow")
      Set-Acl C:\SessionRecording $Acl
      [Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
      Invoke-WebRequest -URI https://github.com/aws-samples/appstream-session-recording/raw/main/script_a.ps1 -OutFile C:\SessionRecording\Scripts\script_a.ps1
      Invoke-WebRequest -URI https://github.com/aws-samples/appstream-session-recording/raw/main/script_b.ps1 -OutFile C:\SessionRecording\Scripts\script_b.ps1
      Invoke-WebRequest -URI https://github.com/aws-samples/appstream-session-recording/raw/main/script_c.ps1 -OutFile C:\SessionRecording\Scripts\script_c.ps1
      Invoke-WebRequest -URI https://github.com/aws-samples/appstream-session-recording/raw/main/variables.ps1 -OutFile C:\SessionRecording\Scripts\variables.ps1
      Invoke-WebRequest -URI https://github.com/aws-samples/appstream-session-recording/raw/main/config.json -OutFile C:\AppStream\SessionScripts\config.json

    4. Close the PowerShell terminal.
  4. To edit the variables.ps1 file with your own values:
    1. From the image builder desktop, choose Start in the Windows taskbar.
    2. Open the context (right-click) menu for Windows PowerShell ISE, and then choose Run as Administrator.
    3. Choose File, then Open. Navigate to the folder C:\SessionRecording\Scripts\ and open the file variables.ps1.
    4. Edit the name and the Region of the S3 bucket with the values returned by AWS CloudFormation in the Outputs tab. You can also customize the number of frames per second, and the maximum duration in seconds of each video file. Save the file.
    5. Save and close the file.
  5. To download the latest FFmpeg and PsExec executables to the image builder:
    1. From the image builder desktop, open the Firefox desktop icon.
    2. Navigate to the URL https://www.gyan.dev/ffmpeg/builds/ffmpeg-release-github and choose the link that contains essentials_build.zip to download FFmpeg. Choose Open to download and extract the ZIP archive. Copy the file ffmpeg.exe in the bin folder of the ZIP archive to C:\SessionRecording\Bin\.

      Note: FFmpeg only provides source code and compiled packages are available at third-party locations. If the link above is invalid, go to the FFmpeg download page and follow the instructions to download the latest release build for Windows.

    3. Navigate to the URL https://download.sysinternals.com/files/PSTools.zip to download PsExec. Choose Open to download and extract the ZIP archive. Copy the file PsExec64.exe to C:\SessionRecording\Bin\. You must agree with the license terms, because the solution in this blog post automatically accepts them.
    4. Close Firefox.

Step 4: Specify an application to publish and create an image

In this step, you publish Firefox on your image builder and create an AppStream 2.0 custom image. I chose Firefox because it’s easy to test later in the procedure. You can choose other or additional applications to publish, if needed.

To specify the application to publish and create the image

  1. From the image builder desktop, open the Image Assistant icon available on the desktop. Image Assistant guides you through the image creation process.
  2. In 1. Add Apps:
    1. Choose + Add App.
    2. Enter the location C:\Program Files (x86)\Mozilla Firefox\firefox.exe to add Firefox.
    3. Choose Open. Keep the default settings and choose Save.
    4. Choose Next multiple times until you see 4. Optimize.
  3. In 4. Optimize:
    1. Choose Launch.
    2. Choose Continue until you can see 5. Configure Image.
  4. In 5. Configure Image:
    1. For Name, enter session-recording for your image name.
    2. Choose Next.
  5. In 6. Review:
    1. Choose Disconnect and Create Image.
  6. Back in the AppStream 2.0 console:
    1. Choose Images in the left pane, and then choose the Image Registry tab.
    2. Change All Images to Private and shared with others. You will see your new AppStream 2.0 image.
    3. Wait until the image is in the Available state. This can take more than 30 minutes.

Step 5: Create an AppStream 2.0 fleet

Next, create an AppStream 2.0 fleet that consists of streaming instances that run your custom image.

To create the AppStream 2.0 fleet

  1. In the left pane of the AppStream 2.0 console, choose Fleets, and then choose Create Fleet.
  2. In Step 1: Provide Fleet Details:
    1. For Name, enter session-recording-fleet.
    2. Choose Next.
  3. In Step 2: Choose an Image:
    1. Select the name of the custom image that you created with the image builder.
    2. Choose Next.
  4. In Step 3: Configure Fleet:
    1. For Instance Type, select stream.standard.medium.
    2. For Fleet Type, choose Always-on.
    3. For Stream view, you can choose to stream either the applications or the entire desktop.
    4. For IAM role, select the IAM role.
    5. Keep the defaults for all other parameters, and choose Next.
  5. In Step 4: Configure Network:
    1. Choose Default Internet Access to provide internet access to your image builder.
    2. Select the VPC, the two subnets, and the security group.
    3. Choose Next.
  6. In Step 5: Review, choose Create.
  7. Wait until the fleet is in the Running state.

Step 6: Create an AppStream 2.0 stack

Create an AppStream 2.0 stack and associate it with the fleet that you just created.

To create the AppStream 2.0 stack

  1. In the left pane of the AppStream 2.0 console, choose Stacks, and then choose Create Stack.
  2. In Step 1: Stack Details:
    1. For Name, enter session-recording-stack.
    2. For Fleet, select the fleet that you created.
  3. Then follow the on-screen instructions and keep the defaults for all other parameters until the stack is created.

Step 7: Create a user in the AppStream 2.0 user pool

The AppStream 2.0 user pool provides a simplified way to manage access to applications for your users. In this step, you create a user in the user pool that you will use later in the procedure to test the solution.

To create the user in the AppStream 2.0 user pool

  1. In the left pane of the AppStream 2.0 console, choose User Pool, and then choose Create User.
  2. Enter your email address, first name, and last name. Choose Create User.
  3. Select the user you just created. Choose Actions, and then choose Assign stack.
  4. Select the stack, and then choose Assign stack.

Step 8: Test the solution

Now, sign in to AppStream 2.0 with the user that you just created, launch a streaming session, and check that the session recordings are delivered to Amazon S3.

To launch a streaming session and test the solution

  1. AppStream 2.0 sends you a notification email. Connect to the sign in portal by entering the information included in the notification email, and set a permanent password.
  2. Sign in to AppStream 2.0 by entering your email address and the permanent password.
  3. After you sign in, you can view the application catalog. Choose Firefox to launch a Firefox window and browse any websites you’d like.
  4. Choose the user icon at the top-right corner, and then choose Logout to end the session.

In the Amazon S3 console, navigate to the S3 bucket to browse the session recordings. For the session you just terminated, you can find one text file that contains user and instance metadata, and one or more video files that you can download and play with a media player like VLC.

Step 9: Clean up resources

You can now delete the two CloudFormation stacks to clean up the resources that were just created.

To clean up resources

  1. To delete the image builder:
    1. In the left pane of the AppStream 2.0 console, choose Images, and then choose Image Builder.
    2. Select the image builder. Choose Actions, then choose Delete.
  2. To delete the stack:
    1. In the left pane of the AppStream 2.0 console, choose Stacks.
    2. Select the image builder. Choose Actions, then choose Disassociate Fleet. Choose Disassociate to confirm.
    3. Choose Actions, then choose Delete.
  3. To delete the fleet:
    1. In the left pane of the AppStream 2.0 console, choose Fleets.
    2. Select the fleet. Choose Actions, then choose Stop. Choose Stop to confirm.
    3. Wait until the fleet is in the Stopped state.
    4. Choose Actions, then choose Delete.
  4. To disable the user in the user pool:
    1. In the left pane of the AppStream 2.0 console, choose User Pool.
    2. Select the user. Choose Actions, then choose Disable user. Choose Disable User to confirm.
  5. Empty the S3 bucket that CloudFormation created (see How do I empty an S3 bucket?). Repeat the same operation with the buckets that AppStream 2.0 created, whose names start with appstream-settings, appstream-logs and appstream2.
  6. Delete the CloudFormation stack on the AWS CloudFormation console (see Deleting a stack on the AWS CloudFormation console).


In this blog post, I showed you a way to record AppStream 2.0 sessions to video files for administrative access auditing, troubleshooting, or quality assurance. While this blog post focuses on Amazon AppStream 2.0, you could adapt and deploy the solution in Amazon Workspaces or in Amazon Elastic Compute Cloud (Amazon EC2) Windows instances.

For a deep-dive explanation of how the solution scripts function, you can refer to the GitHub repository that contains the solution artifacts.

If you have feedback about this post, submit comments in the Comments section below. If you have questions about this post, start a new thread on the Amazon AppStream 2.0 forum or contact AWS Support.

Want more AWS Security how-to content, news, and feature announcements? Follow us on Twitter.


Nicolas Malaval

Nicolas is a Solution Architect for Amazon Web Services. He lives in Paris and helps our healthcare customers in France adopt cloud technology and innovate with AWS. Before that, he spent three years as a Consultant for AWS Professional Services, working with enterprise customers.

2018-03-17 малък видео setup

Post Syndicated from Vasil Kolev original https://vasil.ludost.net/blog/?p=3381

Събирам (засега основно в главата си) setup за видео streaming и запис в hackerspace-овете в България. Изискванията са:

– минимална инвестиция в нов хардуер;
– (сравнително) лесно за използване (предполагам, че хората там са поне донякъде технически грамотни);
– възможност за stream-ване на текущите платформи, и може би и в тяхната си страница;
– запис/архивиране;
– поносимо качество.

Целта на setup-а е да се справи с най-простия тип събитие, което е един лектор с презентация.

Компонентите са следните:

– запис на звука – може да е от въздуха, но по-добре една брошка на лектора, + запис на залата по някакъв начин, за въпроси и т.н.;
– усилване на звука – дори в малка зала е добре да се усили звука от лектора и да се пусне на едни колони, най-малкото има feedback дали си е пуснал микрофона;
– видео запис – да се запише видеото от презентацията и може би самия лектор как говори. Това има варианта с камера, която снима лектора и екрана, или screen capture, директно от лаптопа му (или някой по-сложен setup, за който вероятно няма смисъл да пиша);
– streaming – да се извадят аудио/видео сигнала в/у някакъв протокол и да се stream-нат до някоя услуга;
– restreaming – услугата да го разпрати навсякъде и може би да го запише.

Вариантите за компоненти/setup-и в главата ми са следните:

– ffmpeg команда, която stream-ва екрана + звук от звуковата карта, в която има един свестен микрофон – това го имаме в няколко варианта, тествани и работещи (за windows и linux), трябва да ги качим някъде. Това е най-бързия начин, почти не иска допълнителен хардуер (освен един микрофон, щото тия на лаптопите за нищо не стават). Микрофонът може да е например някоя bluetooth/usb слушалка, или просто от слушалки с микрофон, да е близо до главата на лектора. Може да е от стандартните брошки, които се използват по различни събития, аз имам една китайска цифрова, дето в общи линии ме радва и е около 200-и-нещо лева от aliexpress;

– проста малка камера, която може да записва видео от екрана и звук, която може да бълва и по IP някакси. Това в общи линии са gopro-та (ако се намери как да им се пъхне звук) и още някакви подобни камери, които нямат особено добро качество (особено на звука, та задължително трябва външен микрофон), но на хората и се намират.

– проста камера, която обаче не може да бълва по IP, и има HDMI изход. Това е от нещата, които на хората им се намират по някакви причини, и в тая категория са половината DSLR-и и фотоапарати (които не прегряват след дълга (2-часова) употреба), gopro-та и нормален клас камери. Това се комбинира с устройство, което може да capture-ва HDMI и да го stream-ва, където засега опцията е един китайски device.

– streaming service – човек може да ползва youtube, моя streaming, или ако се мрази, facebook. Много места би трябвало да могат да си пуснат нещо просто при тях (например един nginx с модула за rtmp), да stream-ват до него, то да записва, и от него да restream-ват на други места и да дават някакъв лесен начин на хората ги гледат (с едно video.js/hls.js, както последно направихме за openfest).

Та, за момента основните неща, които издирвам са:

– евтини и работещи микрофони;
– евтини работещи камери с hdmi изход (или с ethernet порт, тва с wifi-то е боза), които да са switchable м/у 50hz и 60hz;
– hdmi capture вариант.

Приемам идеи, и ще гледам да сглобя едно такова за initLab.

Security updates for Tuesday

Post Syndicated from ris original https://lwn.net/Articles/746701/rss

Security updates have been issued by Debian (xen), Fedora (clamav, community-mysql, dnsmasq, flatpak, libtasn1, mupdf, p7zip, rsync, squid, thunderbird, tomcat, unbound, and zziplib), Mageia (clamav, curl, dovecot, ffmpeg, gcab, kernel, libtiff, libvpx, php-smarty, pure-ftpd, redis, and thunderbird), openSUSE (apache-commons-email), Red Hat (rh-mariadb100-mariadb), SUSE (firefox), and Ubuntu (clamav, squid3, and systemd).

Security updates for Monday

Post Syndicated from corbet original https://lwn.net/Articles/745669/rss

Security updates have been issued by Arch Linux (glibc, lib32-glibc, and zziplib), Debian (clamav, ffmpeg, thunderbird, tiff, tiff3, and wireshark), Fedora (firefox, mingw-libtasn1, and webkitgtk4), Gentoo (fossil), Mageia (webkit2), openSUSE (chromium, clamav, and thunderbird), and SUSE (clamav and kernel).

Security updates for New Year’s day

Post Syndicated from ris original https://lwn.net/Articles/742498/rss

Security updates have been issued by Debian (asterisk, gimp, thunderbird, and wireshark), Fedora (global, python-mistune, and thunderbird-enigmail), Mageia (apache, bind, emacs, ffmpeg, freerdp, gdk-pixbuf2.0, gstreamer0.10-plugins-bad/gstreamer1.0-plugins-bad, gstreamer0.10-plugins-ugly, gstreamer0.10-plugins-ugly/gstreamer1.0-plugins-ugly, gstreamer1.0-plugins-bad, heimdal, icu, ipsec-tools, jasper, kdebase4-runtime, ldns, libvirt, mupdf, ncurses, openjpeg2, openssh, python/python3, ruby, ruby-RubyGems, shotwell, thunderbird, webkit2, and X11 client libraries), openSUSE (gdk-pixbuf and phpMyAdmin), and SUSE (java-1_7_1-ibm).

Security updates for Friday

Post Syndicated from jake original https://lwn.net/Articles/740997/rss

Security updates have been issued by Arch Linux (chromium and vlc), Debian (erlang), Mageia (ffmpeg, tor, and wireshark), openSUSE (chromium, opensaml, openssh, openvswitch, and php7), Oracle (postgresql), Red Hat (chromium-browser, postgresql, rh-postgresql94-postgresql, rh-postgresql95-postgresql, and rh-postgresql96-postgresql), SUSE (firefox, java-1_6_0-ibm, opensaml, and xen), and Ubuntu (kernel, linux, linux-aws, linux-kvm, linux-raspi2, linux-snapdragon, linux, linux-raspi2, linux-azure, linux-gcp, linux-hwe, linux-lts-trusty, linux-lts-xenial, linux-aws, and rsync).

Security updates for Tuesday

Post Syndicated from ris original https://lwn.net/Articles/740133/rss

Security updates have been issued by Arch Linux (powerdns and powerdns-recursor), CentOS (curl and samba), Debian (ffmpeg and roundcube), Fedora (cacti and samba), openSUSE (thunderbird), Oracle (curl), Red Hat (java-1.8.0-ibm and rh-mysql56-mysql), Scientific Linux (curl), Slackware (samba), SUSE (kernel-firmware and samba), and Ubuntu (exim4, firefox, libxml-libxml-perl, optipng, and postgresql-common).

Security updates for Wednesday

Post Syndicated from ris original https://lwn.net/Articles/736063/rss

Security updates have been issued by Arch Linux (lame, salt, and xorg-server), Debian (ffmpeg, imagemagick, libxfont, wordpress, and xen), Fedora (ImageMagick, rubygem-rmagick, and tor), Oracle (kernel), SUSE (kernel, SLES 12 Docker image, SLES 12-SP1 Docker image, and SLES 12-SP2 Docker image), and Ubuntu (curl, glance, horizon, kernel, keystone, libxfont, libxfont1, libxfont2, libxml2, linux, linux-aws, linux-gke, linux-kvm, linux-raspi2, linux-snapdragon, linux, linux-raspi2, linux-gcp, linux-hwe, linux-lts-xenial, nova, openvswitch, swift, and thunderbird).

Security updates for Friday

Post Syndicated from jake original https://lwn.net/Articles/735121/rss

Security updates have been issued by Arch Linux (ffmpeg2.8, nvidia, and openvpn), Fedora (git, mercurial, moodle, php-horde-Horde-Image, poppler, and pure-ftpd), openSUSE (fmpeg and vlc), Oracle (firefox, kernel, and nss), Red Hat (firefox and nss), Slackware (mozilla), and SUSE (firefox).

Security updates for Thursday

Post Syndicated from ris original https://lwn.net/Articles/734500/rss

Security updates have been issued by Arch Linux (tomcat7), Debian (kernel and perl), Fedora (libwmf and mpg123), Mageia (bluez, ffmpeg, gstreamer0.10-plugins-good, gstreamer1.0-plugins-good, libwmf, tomcat, and tor), openSUSE (emacs, fossil, freexl, php5, and xen), Red Hat (augeas, rh-mysql56-mysql, samba, and samba4), Scientific Linux (augeas, samba, and samba4), Slackware (samba), SUSE (emacs and kernel), and Ubuntu (qemu).

Security updates for Monday

Post Syndicated from ris original https://lwn.net/Articles/734015/rss

Security updates have been issued by Arch Linux (ffmpeg, lib32-libgcrypt, libgcrypt, linux-zen, and newsbeuter), Debian (emacs25, freexl, and tomcat8), Fedora (cyrus-imapd, FlightGear, freexl, gdm, kernel, LibRaw, ruby, and xen), Gentoo (binutils, chkrootkit, curl, gdk-pixbuf, gimps, git, kpathsea, mod_gnutls, perl, squirrelmail, subversion, supervisor, and webkit-gtk), Mageia (389-ds-base, kernel, kernel-linus, kernel-tmb, and mpg123), openSUSE (ffmpeg, ffmpeg2, qemu, and xen), Slackware (kernel), SUSE (xen), and Ubuntu (gdk-pixbuf).

Digitising film reels with Pi Film Capture

Post Syndicated from Janina Ander original https://www.raspberrypi.org/blog/digitising-reels-pi-film-capture/

Joe Herman’s Pi Film Capture project combines old projectors and a stepper motor with a Raspberry Pi and a Raspberry Pi Camera Module, to transform his grandfather’s 8- and 16-mm home movies into glorious digital films.

We chatted to him about his Pi Film Capture build at Maker Faire New York 2016:

Film to Digital Conversion at Maker Faire New York 2016

Uploaded by Raspberry Pi on 2017-08-25.

What inspired Pi Film Capture?

Joe’s grandfather, Leo Willmott, loved recording home movies of his family of eight children and their grandchildren. He passed away when Joe was five, but in 2013 Joe found a way to connect with his legacy: while moving house, a family member uncovered a box of more than a hundred of Leo’s film reels. These covered decades of family history, and some dated back as far as 1939.

Super 8 film reels

Kodachrome film reels of the type Leo used

This provided an unexpected opportunity for Leo’s family to restore some of their shared history. Joe immediately made plans to digitise the material, knowing that the members of his extensive family tree would provide an eager audience.

Building Pi Film Capture

After a failed attempt with a DSLR camera, Joe realised he couldn’t simply re-film the movies — instead, he would have to capture each frame individually. He combined a Raspberry Pi with an old Super 8 projector, and set about rigging up something to do just that.

He went through numerous stages of prototyping, and his final hardware setup works very well. A NEMA 17 stepper motor  moves the film reel forward in the projector. A magnetic reed switch triggers the Camera Module each time the reel moves on to the next frame. Joe hacked the Camera Module so that it has a different focal distance, and he also added a magnifying lens. Moreover, he realised it would be useful to have a diffuser to ‘smooth’ some of the faults in the aged film reel material. To do this, he mounted “a bit of translucent white plastic from an old ceiling fixture” parallel with the film.

Pi Film Capture device by Joe Herman

Joe’s 16-mm projector, with embedded Raspberry Pi hardware

Software solutions

In addition to capturing every single frame (sometimes with multiple exposure settings), Joe found that he needed intensive post-processing to restore some of the films. He settled on sending the images from the Pi to a more powerful Linux machine. To enable processing of the raw data, he had to write Python scripts implementing several open-source software packages. For example, to deal with the varying quality of the film reels more easily, Joe implemented a GUI (written with the help of PyQt), which he uses to change the capture parameters. This was a demanding job, as he was relatively new to using these tools.

Top half of GUI for Pi Film Capture Joe Herman

The top half of Joe’s GUI, because the whole thing is really long and really thin and would have looked weird on the blog…

If a frame is particularly damaged, Joe can capture multiple instances of the image at different settings. These are then merged to achieve a good-quality image using OpenCV functionality. Joe uses FFmpeg to stitch the captured images back together into a film. Some of his grandfather’s reels were badly degraded, but luckily Joe found scripts written by other people to perform advanced digital restoration of film with AviSynth. He provides code he has written for the project on his GitHub account.

For an account of the project in his own words, check out Joe’s guest post on the IEEE Spectrum website. He also described some of the issues he encountered, and how he resolved them, in The MagPi.

What does Pi Film Capture deliver?

Joe provides videos related to Pi Film Capture on two sites: on his YouTube channel, you’ll find videos in which he has documented the build process of his digitising project. Final results of the project live on Joe’s Vimeo channel, where so far he has uploaded 55 digitised home videos.

m093a: Tom Herman Wedding, Detroit 8/10/63

Shot on 8mm by Leo Willmott, captured and restored by Joe Herman (Not a Wozniak film, but placed in that folder b/c it may be of interest to Hermans)

We’re beyond pleased that our tech is part of this amazing project, helping to reconnect the entire Herman/Willmott clan with their past. And it was great to be able to catch up with Joe, and talk about his build at Maker Faire last year!

Maker Faire New York 2017

We’ll be at Maker Faire New York again on the 23-24 September, and we can’t wait to see the amazing makes the Raspberry Pi community will be presenting there!

Are you going to be at MFNY to show off your awesome Pi-powered project? Tweet us, so we can meet up, check it out and share your achievements!

The post Digitising film reels with Pi Film Capture appeared first on Raspberry Pi.


Post Syndicated from Vasil Kolev original https://vasil.ludost.net/blog/?p=3364

На FOSDEM 2016 видео потоците в локалната мрежа бяха носени през UDP, което при загуби по мрежата водеше до разни неприятни прекъсвания и обърквания на ffmpeg-а.

След разговори по темата за мрежа без загуби, пакети, пренасяни от еднорози и изграждане на infiniband мрежа в ULB, бях стигнал до идеята да търся или нещо с forward error correction, или някакъв reliable multicast. За FEC се оказа, че има някаква реализация от едно време за ffmpeg за PRO-MPEG, която не е била приета по някакви причини, за reliable multicast открих два протокола – PGM и NORM.

За PGM се оказа, че има хубава реализация, която 1) я има в Debian, 2) има прилични примери и 3) може да има средно ужасна документация, но source е сравнително четим и става за дебъгване. Измъкнах си старото ttee, разчистих кода от разни ненужни неща и си направих едно тривиално proxy, което да разнася пакети между UDP и PGM (и stdin/stdout за дебъгване). Може да се намери на https://github.com/krokodilerian/pgmproxy, като в момента е в proof-of-concept състояние и единственото, което мога да кажа е, че успявам да прекарам през него един FLAC през мрежата и да го слушам 🙂 Следват тестове в мрежа със загуби (щото в моя локален wifi са доста малко) и доизчистване, че да го ползваме на FOSDEM.

Security updates for Tuesday

Post Syndicated from ris original https://lwn.net/Articles/732264/rss

Security updates have been issued by Debian (ffmpeg, fontforge, and openjdk-7), Fedora (cvs, java-1.8.0-openjdk-aarch32, krb5, and mercurial), Mageia (chromium and libgxps), Red Hat (rh-nginx110-nginx), SUSE (java-1_7_1-ibm), and Ubuntu (ghostscript, kernel, linux, linux-aws, linux-gke, linux-raspi2, linux-snapdragon, linux, linux-raspi2, linux-hwe, linux-lts-xenial, and python-crypto).

Security updates for Monday

Post Syndicated from ris original https://lwn.net/Articles/730910/rss

Security updates have been issued by Debian (botan1.10, cvs, firefox-esr, iortcw, libgd2, libgxps, supervisor, and zabbix), Fedora (curl, firefox, git, jackson-databind, libgxps, libsoup, openjpeg2, potrace, python-dbusmock, spatialite-tools, and sqlite), Mageia (cacti, ffmpeg, git, heimdal, jackson-databind, kernel-linus, kernel-tmb, krb5, php-phpmailer, ruby-rubyzip, and supervisor), openSUSE (firefox, librsvg, libsoup, ncurses, and tcmu-runner), Oracle (firefox), Red Hat (java-1.8.0-ibm), Slackware (git, libsoup, mercurial, and subversion), and SUSE (kernel).