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• avcodec/hevcdec : check that the local context list was allocated before dereferencing it

  10 février 2021, par James Almer

  avcodec/hevcdec : check that the local context list was allocated before dereferencing it
  Since the decoder is not flagged as init cleanup capable, hevc_decode_free()
  
  is being called manually if the hevc_decode_extradata() call fails at the end
  
  of hevc_decode_init().
  
  In a frame threading scenario, however, if AVCodec->init() returns an error,
  
  ff_frame_thread_free() will be called regardless of the above flag being set
  
  or not, resulting in hevc_decode_free() being called a second time for the
  
  same context.
  Workaround this by ensuring pointers are not dereferenced if they are NULL,
  
  and set the decoder as init cleanup capable while at it.
  Fixes ticket #9099.
  Signed-off-by : James Almer <jamrial@gmail.com>
  

  • [DH] libavcodec/hevcdec.c

• ffprobe get pts of last audio/video packet

  17 novembre 2018, par Vinay

  I have an mov file that I need to get the ending pts for both the audio and video streams. I’m able to do this by doing the following (manually) :

  ffprobe -show_packets file.mov

  Which gives me an output like (with many more packets of course) :

  [PACKET]
  
  codec_type=audio
  
  stream_index=0
  
  pts=221184
  
  pts_time=5.015510
  
  dts=221184
  
  dts_time=5.015510
  
  duration=580
  
  duration_time=0.013152
  
  convergence_duration=N/A
  
  convergence_duration_time=N/A
  
  size=304
  
  pos=4833575
  
  flags=K_
  
  [/PACKET]
  
  [PACKET]
  
  codec_type=video
  
  stream_index=1
  
  pts=29800
  
  pts_time=4.966667
  
  dts=29400
  
  dts_time=4.900000
  
  duration=200
  
  duration_time=0.033333
  
  convergence_duration=N/A
  
  convergence_duration_time=N/A
  
  size=20707
  
  pos=4837376
  
  flags=__
  
  [/PACKET]

  In the scenario above, the ending pts is 221764 for audio and 30000 for video (pts + duration).

  I was wondering if there was an easy way to either get the final audio/video packet pts directly via ffprobe flags or by intelligently parsing the output.

• Dealing with 302 Redirection in FFMPEG

  25 mars 2015, par Bilal Ahmed Yaseen

  I am using FFMPEG Library to Stream Audio from RTSP URL. My Sample Streaming URL is :

  rtsp://username:password@machine-ip/708314c4eba2a041

  And I am using the following command for streaming this RTSP URL :

  ffmpeg -i RTSP_URL -f mov C:\FFMPEG_Recordings\bay.mov

  So, the above FFMPEG command will capture the media stream from RTSP_URL and will store in bay.mov media file.

  Sometimes, I get 302 Redirection Error from the Server which is actually propagating streams. Such as :

  [rtsp @ 0000000002cc8100] Status 302: Redirecting to rtsp://server-ip:server-port/708314c4eba2a041?token=708114c4e99dbcd1^LA^0^0^0^1427248150^e77149b2a2c209982a74367d0f72c2e11ba6636c

  And after this process gets stuck (on Command Prompt) until I press CTRL+C twicely to terminate it in cmd where I run this command.

  While It should start streaming from the redirected URL automatically.

  I read that It’s a FFMPEG’s bug on FFMPEG Track and also read about it on FFMPEG Discussion Community but didn’t get any solution or workaround for this.

  Please guide to overcome this scenario If anyone ever encountered it that what are workarounds for this. Thnaks