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• Use ffmpeg to extract/remix audio from/into video

  2 décembre 2023, par user37143

  Working on a Mac, I have a bunch of .mkv files that I want to extract the audio from, then use an ML model I have in order to translate them and then mix them back into the video.

  


  For the extraction phase, I am running :
ffmpeg -i {input_video}.mkv -map 0:a -c copy {output_audio}.aac
however I am getting these errors :

  


  [adts @ 0x130708b30] Only AAC streams can be muxed by the ADTS muxer
[out#0/adts @ 0x6000031943c0] Could not write header (incorrect codec parameters ?): Invalid argument
[aost#0:1/copy @ 0x13070a050] Error initializing output stream: 


  


  which I suspect are because of subtitles, seeing these warnings earlier in the output :

  


  [matroska,webm @ 0x130704260] Could not find codec parameters for stream 4 (Subtitle: (pgssub)): unspecified size
Consider increasing the value for the 'analyzeduration' (0) and 'probesize' (5000000) options
[matroska,webm @ 0x130704260] Could not find codec parameters for stream 5 (Subtitle:  (pgssub)): unspecified size
Consider increasing the value for the 'analyzeduration' (0) and 'probesize' (5000000) options
[matroska,webm @ 0x130704260] Could not find codec parameters for stream 6 (Attachment: none): unknown codec
Consider increasing the value for the 'analyzeduration' (0) and 'probesize' (5000000) options


  


  The only command that has worked for me so far is
ffmpeg -i {input_video}.mkv -vn -c:a aac {output_aduio}.wav which however created a completely empty audio file.

  


  Any help would be greatly appreciated

  


• FFmpeg - inverting one of two audio files and merging them

  3 février 2023, par kubinka0505

  I want to merge two files with FFmpeg, but one with inverted phase.

  


  I've used following command, but It doesn't work.

  


  ffmpeg -i "Song.wav" -i "Vocals.wav" -filter_complex "[0:a][1:a]amerge=inputs=2,pan=stereo|c0=c0|c1=-c1[a]" -map [a] "Instrumental.wav"

  


  [Parsed_pan_1 @ 04c69000] Expected in channel name, got "-c1"
[AVFilterGraph @ 04b9bd80] Error initializing filter 'pan' with args 'stereo|c0=c0|c1=-c1'
Error initializing complex filters.
Invalid argument


  


  I've also tried multiple variants of c0code>, etc.

  


  What command should I use ? Or maybe there's an easier workaround ?

  


• FFMPEG - modify only part of video with select filter

  28 janvier 2023, par Compact

  I have a video file - an NTSC DVD rip. I want to convert it into PAL DVD. The problem with that NTSC DVD is that it's a mixture of telecined content, true progressive 29.97 content, true interlaced content at 29.97 fps. The problem is with the true interlaced content - it's sometimes encoded as top field first and sometimes as bottom field first...

  


  To keep quality as much as possible, I would like remove telecined frames, but keep those interlaced sequences and turn them to 25 fps top field first. This is where the problem arises.

  


  I tried to make filter_complex chain with two select filters, where I reverse the fields for bottom field first frames, but the video is not encoding at all when I do that.

  


  Here is an example filter chain I tried to make - I've made a lot of iterations of something similar, using select or metadata select to no avail. I guess I don't understand how select and metadata select filters work. And I don't know how to do what I want.

  


  ffmpeg -i "input" -flags +ildct+ilme \
-filter_complex\
[0:v]idet,setparams=color_primaries=smpte170m:color_trc=bt709:colorspace=smpte170m \
,metadata=select:key=lavfi.idet.single.current_frame:value=bff:function=same_str,phase=b[bot];\[bot]metadata=select:key=lavfi.idet.single.current_frame:value=tff:function=same_str\
,fieldmatch=mode=pcn_ub:combmatch=full,decimate[tff];\
[tff]metadata=select:key=lavfi.idet.single.current_frame:value=progressive:function=same_str\
,fps=24000/1001[v1];[v1]select,setfield=tff[v]"


  


  If all of the interlaced content was top field first, I could simply do something similar to this :

  


  ffmpeg -i "input" -flags +ildct+ilme \
-filter:v "dejudder,fps=30000/1001,fieldmatch=mode=pcn_ub:combmatch=full,\
decimate,settb=1/25000,setpts=N/(25*TB),setfield=tff,setparams=field_mode=tff"


  


  Is that possible with ffmpeg ? To just modify a part of video and then modify it whole, including with the previous modification ?