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• ffprobe : support printing AVStream and AVPacket side data

  3 mai 2015, par Michael Niedermayer

  ffprobe : support printing AVStream and AVPacket side data
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] doc/ffprobe.xsd
  • [DH] ffprobe.c

• multithreaded client/server listener using ffmpeg to record video

  29 janvier 2014, par user1895639

  I've got a python project where I need to trigger start/stop of two Axis IP cameras using ffmpeg. I've gotten bits and pieces of this to work but can't put the whole thing together. A "listener" program runs on one machine that can accept messages from other machines to start and stop recordings.

  The listener responds to two commands only :

  START v :/video_dir/myvideo.mov
  STOP

  The START command is followed by the full path of a video file that it will record.
  When receiving a STOP command, the video recording should stop.

  I am using ffmpeg to attach to cameras, and manually doing this works :

  ffmpeg.exe -i rtsp ://cameraip/blah/blah -vcodec copy -acodec copy -y c :\temp\output.mov

  I can attach to the stream and upon hitting 'q' I can stop the recording.

  What I'd like to be able to do is relatively simple, I just can't wrap my head around it :

  Listener listens
  When it receives a START signal, it spawns two processes to start recording from each camera
  When it receives a STOP signal, it sends the 'q' keystroke to each process to tell ffmpeg to stop recording.

  I've got the listener part, but I'm just not sure how to get the multithreaded part down :

  while True:
  
      client,address = s.accept()
  
      data = client.recv( size )
  
      if data:
  
          if data.startswith('START'):
  
              # start threads here
  
          elif data.startswith('STOP'):
  
              # how to send a stop to the newly-created processes?

  In the thread code I'm doing this (which may be very incorrect) :

  subprocess.call('ffmpeg.exe -i "rtsp://cameraipstuff -vcodec copy -acodec copy -t 3600 -y '+filename)  

  I can get this process to spawn off and I see it recording, but how can I send it a "q" message ? I can use a Queue to pass a stop message and then do something like

  win32com.client.Dispatch('WScript.Shell').SendKeys('q')

  but that seems awkward. Perhaps a pipe and sending q to stdin ? Regardless, I'm pretty sure using threads is the right approach (as opposed to calling subprocess.call('ffmpeg.exe ...') twice in a row), but I just don't know how to tie things together.

• How to decode video using AMF, Intel Media SDK, and NVIDIA CUDA for hardware decoding all platforms ?

  23 novembre 2022, par Guy

  I want to make a multi-platform video streaming app but idk how to implement hardware decoding for AMD, NVIDIA and Intel.
For this project I also want to use FFmpeg.
Pls help.

  


  I tried d3d11va on windows but I want other rendering API's as well.