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• How to record playable video files in gstreamer even if recording is interrupted unexpectedly (e.g. power disconnects) ?

  16 septembre 2021, par Otter_warrior

  I have been recording video streams on my Jetson Xavier NX using a simple gstreamer pipeline such as this

  


  gst-launch-1.0 -v \
nvarguscamerasrc sensor-id=0 ! \
'video/x-raw(memory:NVMM), width=(int)1920, height=(int)1080, format=(string)NV12, framerate=(fraction)30/1' ! \
nvv4l2h265enc ! 'video/x-h265, stream-format=(string)byte-stream' ! \
h265parse ! qtmux ! filesink location=video.mp4 -e


  


  All is working if the recording is interrupted by keyboard interrupt Ctrl + C, but if the recording is interrupted unexpectedly (e.g. power gets disconnected) the resulting file has no playable stream, even if the file size is correct.

  


  I know that mp4 recording needs to be stopped properly otherwise it won't have the necessary information at the end of the file, but I was wondering if there was any other gstreamer pipelines or final file formats that would allow for an H265 encoded video file to be playable even if the recording is ended unexpectedly.

  


  It would be good even if the recorded file needed to be converted before being playable (e.g. with ffmpeg), as long as the information can be recovered without having to go through non-free mp4 recovery tools.

  


• lavu/tx : refactor power-of-two FFT

  10 avril 2021, par Lynne

  lavu/tx : refactor power-of-two FFT
  This commit refactors the power-of-two FFT, making it faster and
  
  halving the size of all tables, making the code much smaller on
  
  all systems.
  
  This removes the big/small pass split, because on modern systems
  
  the "big" pass is always faster, and even on older machines there
  
  is no measurable speed difference.
  

  • [DH] libavutil/tx_priv.h
  • [DH] libavutil/tx_template.c

• I am trying to use ffmpeg to separate audio from video, but after downloading the ffmpeg build I cannot seem to activate it in Power Shell [duplicate]

  19 janvier 2021, par Row Boater

  Ok, look y'all, I am NOT an aspiring programmer. I'm simply trying to separate audio from video of a youtube video I downloaded.

  


  What I've done :

  


  Downloaded YT vid using 4k video Downloader

  


  I downloaded ffmpeg build from https://ffmpeg.org/download.html#build-windows

  


  I downloaded WinZip in order to access the ffmpeg files.

  


  I thought I used winzip correctly, but whenever I paste the command code line recommended to me, ffmpeg -i video.mp4 -c:a pcm_s16le audio.wav, I receive the following :

  


  


  PS C :\Users\user\Videos\4K Video Downloader> ffmpeg -i video.mp4 -c:a
pcm_s16le audio.wav ffmpeg : The term 'ffmpeg' is not recognized as
the name of a cmdlet, function, script file, or operable program.
Check the spelling of the name, or if a path was included, verify that
the path is correct and try again. At line:1 char:1

  


  

  • ffmpeg -i video.mp4 -c:a pcm_s16le audio.wav

  


  • 


      + CategoryInfo          : ObjectNotFound: (ffmpeg:String) [], CommandNotFoundException
  + FullyQualifiedErrorId : CommandNotFoundException



    


  


  


  PS C :\Users\user\Videos\4K Video Downloader>

  


  


  This is all Phoenician to me, but what I take away is that I have not completed some step to fully incorporate the ffmpeg code into my system. I believe that I am not using Winzip correctly.

  


  Thanks for your time.