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• rtsp : Fix infinite loop in listen mode with UDP transport

  30 septembre 2020, par Martin Storsjö

  rtsp : Fix infinite loop in listen mode with UDP transport
  In listen mode with UDP transport, once the sender has sent
  
  the TEARDOWN and closed the connection, poll will indicate that
  
  one can read from the connection (indicating that the socket has
  
  reached EOF and should be closed by the receiver as well). In this
  
  case, parse_rtsp_message won't try to parse the command (because
  
  it's no longer in state STREAMING), but previously just returned
  
  zero.
  Prior to f6161fccf8c5720ceac1ed1df8ba60ff8fed69f5, this caused
  
  udp_read_packet to return zero, which is treated as EOF by
  
  read_packet. But after that commit, udp_read_packet would continue
  
  if parse_rtsp_message didn't return an explicit error code.
  To keep the original behaviour from before that commit, more
  
  explicitly return an error in parse_rtsp_message when in the wrong
  
  state.
  Fixes : #8840
  
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DH] libavformat/rtsp.c

• Exporting MPEG Transport Stream (.ts) keyframes to images in C/C++ ? Libavcodec / FFMPEG ?

  11 mai 2021, par CyberBully2003

  I have some buffers made up of 188 byte TS packets. When I write them to a file, I can successfully view these .ts files in a video player. MPEG-2/H.264 is the format of the Transport Streams.

  


  Now, I would like to export the keyframes from these Transport Streams buffers (or .ts files) as .jpeg or some other common image format in my C/C++ project.

  


  This is a trivial task from the command line using ffmpeg, where I just feed it the .ts file and some parameters.

  


  However, for the purpose of this project, I would like to accomplish this conversion/exporting of keyframes as images code-side in my current C/C++ directory because the raw bytes from these generated images will be put into another format.

  


  People online seem to recommend using libavcodec. There is an mpegets file in the ffmpeg source that seems like it might have some of the backend to do what I want.

  


  However, the steps needed to achieve this task using the library is not apparent.

  


  I know I could call ffmpeg from C++ and use stdin, but this isn't a preferred solution for this project.

  


  If someone could give me some guidance (and even better some example code) to accomplish this task, it would be greatly appreciated !

  


• Combining audio (.mp4) file and video (.webm) file to a new (.mp4) file using python [closed]

  3 mai 2020, par D. Damyanov

  How can I merge .webm video file and a .mp4 audio file to a new .mp4 audio/video file using python ? I tried to use the ffmpeg package for PyCharm but I am having troubles with finding the right documentation. On the official site https://ffmpeg.org/ I`ve found only instructions for usage in the terminal or cmd.