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• Encoding a growing video file in realtime fails prematurely

  17 janvier 2023, par Macster

  This batch script is repeatedly concatenating video clips from an textfile. The output file is then beeing encoded in realtime into dash format. Unfortunately the realtime encoding will always end prematurely and I can't figure out why. From what I observed, it shouldn't be possible that the realtime encoding would catch up to the concating - which is happening each time after the duration of the clip that was just added - because I'm setting an offset, to when the encoding has to start, via timeout.

  


  I've tried other formats like .mp4 and .h264 and other options, but nothing seems to help. So my assumption is, that there is a conflict when read/write operation is made and these operations overlap at a certain point. But how do I find out when and how to avoid it ? I haven't had the feeling that something was happening at the exact same time, when observing the command promt.

  


  
The screenshot was taken right at failing. As you can see, the concat file queue1.webm is already more than 10 seconds longer than the realtime encoding at its failing position. That's why I don't think it has to do with catching up too fast. It will fail randomly, so one time it fails at 25 seconds and next time it might fail at 2 minutes and 20 seconds.

  


  To avoid the possibility of different video settings causing troubble, I'm using only one video file. I will link it here : BigBuckBunny (Mega NZ) It's a 10 sec snippet from BigBuckBunny. I hope this is legal !? But you can use what ever clip you want.

  


  IMPORTANT : If you try to reproduce the behaviour, please make sure you make at least one entry,
  like file 'bigbuckbunny_webm.webm' in mylist.txt, because adding something if the file is empty is kinda broken :)

  


  So here is the code :

  


  Just the FFMPEG commands :

  


  ffmpeg -f concat -i "mylist.txt" -safe 0  -c copy -f webm -reset_timestamps 1 -streaming 1 -live 1 -y queue1.webm
[..]
ffmpeg -re -i queue1.webm -c copy -map 0:v -use_timeline 1 -use_template 1 -remove_at_exit 0 -window_size 10 -adaptation_sets "id=0,streams=v" -streaming 1 -live 1 -f dash -y queue.mpd


  


  makedir.bat

  


  @ECHO on

:: Create new queue
IF NOT EXIST "queue1.webm" mkfifo "queue1.webm"

setlocal EnableDelayedExpansion

set string=file 'bigbuckbunny_webm.webm'
set video_path=""
SET /a c=0
set file=-1
set file_before=""

:loop
::Get last entry from "mylist.txt"
for /f "delims=" %%a in ('type mylist.txt ^| findstr /b /c:"file"') do (
  set video_path=%%a
)
echo %video_path%

::Insert file 'bigbuckbunny_webm.webm' if mylist.txt is empty.
if "%video_path%" EQU """" (echo %string% >> mylist.txt && set file=%string:~6,-1%) else (set file=%video_path:~6,-1%)

::Insert file 'bigbuckbunny_webm.webm' into mylit.txt if actual entry(%file%) is the same than before(file 'bigbuckbunny_webm.webm').
if "%file%" EQU "%file_before%" (echo. >> mylist.txt && echo %string%>>mylist.txt) 

echo %file%

::Get the video duration
for /f "tokens=1* delims=:" %%a in ('ffmpeg -i %file% 2^>^&1 ^| findstr "Duration"') do (set duration=%%b)
echo %duration%

::Crop format to HH:MM:SS
set duration=%duration:~1,11%
echo %duration%

::Check if seconds are double digits, less than 10, like 09. Then use only 9.
if %duration:~6,1% EQU 0 (
  set /a sec=%duration:~7,1% 
    ) else ( 
        set /a sec=%duration:~6,2%

)
echo %sec%

::Convert duration into seconds
set /a duration=%duration:~0,2%*3600+%duration:~3,2%*60+%sec%
echo %duration%

::echo %duration%

::Increase iteration count.
set /a c=c+1

::Add new clip to queue.
ffmpeg -f concat -i "mylist.txt" -safe 0  -c copy -f webm -reset_timestamps 1 -streaming 1 -live 1 -y queue1.webm

::Start realtime encoding queue1, if a first clip was added.
if !c! EQU 1 (
  start cmd /k "startRealtimeEncoding.bat"
)

::Wait the duration of the inserted video 
timeout /t %duration%

::Set the actual filename as the previous file for the next iteration.
set file_before=%file%

::Stop after c loops.
if !c! NEQ 20 goto loop

echo %c%

endlocal

:end  


  


  startRealtimeEncoding.bat

  


  @ECHO off

timeout /t 5
ffmpeg -re -i queue1.webm -c copy -map 0:v -seg_duration 2 -keyint_min 48 -use_timeline 1 -use_template 1 -remove_at_exit 0 -window_size 10 -adaptation_sets "id=0,streams=v" -streaming 1 -live 1 -f dash -y queue.mpd

:end


  


• Creating standalone tool-chain for android NDK

  13 avril 2014, par vijay

  I am trying to build latest FFmpeg along with halfninja's code for android since some of the options are not available in older versions.I updated FFmpeg packages and tried to run ./create_toolchain.sh.

  I am getting the following error :

  user@user:~/Android/android-ffmpeg-x264/Project/jni$ ./create_toolchain.sh 
  
      ~/Android/android-ffmpeg-x264/Project/jni ~/Android/android-ffmpeg-x264/Project/jni
  
      /home/user/android/tools:/home/user/android/platform-tools:/usr/lib/lightdm/lightdm:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/home/user/android/tools:/home/user/android/platform-tools:/home/user/Android/android-ndk-r8e:/home/user/Android/android-ffmpeg-x264/Project/jni/toolchain/bin
  
      Host system 'linux-x86' is not supported by the source NDK!
  
      Try --system=<name> with one of:  linux-x86_64
  
  </name>

  My android NDK version is android-ndk-r8e.
  I am facing problems in building latest version of FFmpeg by creating standalone toolchain.

  Any help is appreciated.

• Invalid CFBundleSupportedPlatforms value iPhoneSimulator in (DJIWidget) FFmpeg.framework

  10 mai 2022, par Brien Crean

  I cannot upload my app which contains the DJI-SDK, DJIWidget(which contains FFMpeg) to Testflight after updating to Xcode 13. When I try I get :

  


  


  Invalid CFBundleSupportedPlatforms value. The
CFBundleSupportedPlatforms key in the Info.plist file in
“Payload/app.app/Frameworks/FFmpeg.framework” bundle contains an
invalid value, [iPhoneSimulator]. Consider removing the
CFBundleSupportedPlatforms key from the Info.plist file. If this
bundle is part of a third-party framework, consider contacting the
developer of the framework for an update to address this issue. With
error code STATE_ERROR.VALIDATION_ERROR.90542 for id
f2327257-ad48-4b60-8fc8-a518da5fbac8

  


  


  # relevant pods
pod 'DJI-SDK-iOS', '~> 4.16'
pod 'DJIWidget', '~> 1.6.6'


  


  However FFMpeg seems to be a binary file Framework attached to DJIWidget so I can't edit the Info.plist directly. Is there any way to workaround this or do I have to reach out to the DJI to actually make a change ?