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• fftools/ffmpeg_dec : abort if avcodec_send_packet() returns EAGAIN

  22 mai 2023, par James Almer

  fftools/ffmpeg_dec : abort if avcodec_send_packet() returns EAGAIN
  As the comment in the code mentions, EAGAIN is not an expected value here
  
  because we call avcodec_receive_frame() until all frames have been returned.
  
  avcodec_send_packet() returning EAGAIN means a packet is still buffered, which
  
  hints that the underlying decoder is buggy and not fetching packets as it
  
  should.
  An example of this behavior was in the libdav1d wrapper before f209614290,
  
  where feeding it split frames (or individual OBUs) would result in the CLI
  
  eventually printing the confusing "Error submitting packet to decoder : Resource
  
  temporarily unavailable" error message, and just keep going until EOF without
  
  returning new frames.
  Signed-off-by : James Almer <jamrial@gmail.com>
  

  • [DH] fftools/ffmpeg_dec.c

• avcodec/mediacodecdec : warn when input buffers are not configured with proper size

  5 septembre 2019, par Aman Gupta

  avcodec/mediacodecdec : warn when input buffers are not configured with proper size
  In rare circumstances, if the codec is not configured with the
  
  proper parameters the input buffers can be allocated with a size
  
  that's too small to hold an individual packet. Since MediaCodec
  
  expects exactly one incoming buffer with a given PTS, it is not
  
  valid to split data for a given PTS across two input buffers.
  See https://developer.android.com/reference/android/media/MediaCodec#data-processing:
    > Do not submit multiple input buffers with the same timestamp
  Signed-off-by : Aman Gupta <aman@tmm1.net>
  

  • [DH] libavcodec/mediacodecdec.c

• FFMPEG overlay:enable removing video from screen ?

  28 août, par Harold Obasi

  i am working on a filter that shows each video on a screen based on which video's turn it is

  


  in this case the screen is 1080x1920 (for tik tok, short form content etc) with a black background, and this is the filter i have so far

  


  turns (time ranges each video should be present on screen)
v0 : (0 - 5), (10 - 15)
v1 : (5 - 10)

  


  ffmpeg -i video1.mp4 -i video2.mp4 -i audio.mp3 -filter_complex "
[0:v]scale=1080:-1[v0];
[1:v]scale=1080:-1[v1];

color=size=1080x1920:color=black[bg];

[v0][v1]overlay=x=0:y=100:enable='between(t,5,10)'[base];
[bg][base]overlay=x=0:y=0[outv]
" -map "[outv]" -map 2:a -c:v libx264 -c:a aac -preset fast -shortest out.mp4


  


  with this i get the turn based switching I am looking for

  


  the issue with this is that in some cases i'd like to be able to move the positions of the individual videos

  


  for example in the above filter i set y=100 for v1, but i whenever its' not v1's turn it's inactive

  


  I'd like for it to simply go behind v0, because i need all the videos to be visible, except they have the exact positions

  


  from the docs, i understand that this is because enable, will prevent my video from showing when its condition isn't met

  


  please, how can i solve this issue this, is there a filter for this exact case