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• aac : Correctly map multichannel ADTS AAC with non-zero channel_config + PCE

  3 juin 2015, par nu774

  aac : Correctly map multichannel ADTS AAC with non-zero channel_config + PCE
  The decoder assigns channels using default channel configuration
  
  for 5.1ch when it parses an ADTS frame header using consecutive
  
  channel ids.
  When a PCE comes, it reassigns channels using PCE configuration
  
  using directly the ids provided. They can be arbitrary.
  Always use consecutive channel ids to avoid decoding glitches due
  
  spurious reconfigurations due the channel ids mismatch between the
  
  two otherwise-identical channel maps.
  Signed-off-by : Luca Barbato <lu_zero@gentoo.org>
  

  • [DBH] libavcodec/aacdec.c

• Copy chapters in MP4 input stream to output stream in ffmpeg

  18 juin 2017, par WheresWardy

  I’m using ffmpeg to copy two MP4 input streams into one output container and I’m having trouble maintaining the chapter indexes from both files into the output stream.

  I have two files, specified by streams.txt which is in the correct format, that both contain an H.264 video stream, an AC-3 audio stream and an AAC audio stream, and am concatenating the two files using the following ffmpeg command :

  ffmpeg -f concat -safe 0 -i streams.txt -map 0:0 -map 0:1 -map 0:2 -c:v copy -c:a:0 copy -c:a:1 copy output.mp4

  This correctly produces the output file that I want, with both files combined into an output file with all three streams. I am however having trouble adding the chapters from both input files into the output one. I understand that I’m supposed to use the -map_metadata option, but I’m having trouble with the format of it that doesn’t produce the following error message :

  Invalid chapter index 0 while processing metadata maps.

• Audio issues when overlaying two videos (ffmpeg)

  4 août 2021, par crashyourtesla

  I'm trying to overlay a short 10 second video on top of a 2 minute video and have the 10 second video show up at the 30 second mark. Here is what I have so far

  


  start = 30
subprocess.run(
    f'ffmpeg -y \
        -i {os.path.join(path, "2minutevideo.mp4")} \
        -i {os.path.join(path, "popup.mov")} \
        -filter_complex \
        "[0:v]setpts=PTS-STARTPTS[v0]; \
        [1:v]setpts=PTS-STARTPTS+{notify_start}/TB[v1]; \
        [v0][v1]overlay=enable=\'between(t, {notify_start}, {notify_start + get_duration(os.path.join(path, "popup.mp4"))})\' [out1]" \
        {render_flags} -r 24 -map 1:a -map [out1] -async 1 \
        {os.path.join(source_folder, "test.mp4")}')


  


  What this does is that popup.mov shows up at 30 seconds and plays for its entire duration. However, I have two issues :

  


  

  1. popup.mov's audio still plays at the beginning. I've tried itsoffset, setting the pts but both seem to not work or have errors.

  


  2. The only audio playing is popup.mov's audio. I would like both 2minutevideo and popup.mov to play audio. Yes, I'm aware it's because -map 1:a only maps the popup's audio to the final video, but I have no idea how to have both audio play. Would I have to mix it ?

  


  


  Thank you