New answers tagged audio
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My DVB-T recordings always have this issue. Try MC-TVConverter2!
It is a (old but still reliable) graphical interface for several video tools. Try converting your original ts recording(s) using the MPEG2 HQ setting - I've found this option to be more of a repair than a re-encode, as the conversion is quick and the resultant file size is very close to the ...
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Commands are instructions sent from an interface external to the filter, usually an external program using a ZMQ protocol. There is a filter that can execute commands which is what I'll use here.
Base syntax is
ffmpeg -i in -af "asendcmd=c='0.0 afftdn@n sn start; 1.0 afftdn@n sn stop',afftdn@n" noiseout.wav
To use another source for noise profile, you'll ...
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Use
ffmpeg -i input.mkv -map_metadata 0 -map 0 -c copy -c:a:0 ac3 -vbr 3 output.mkv
See https://superuser.com/a/1219824 for an illustrated guide to how stream options are parsed.
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Some media players simply start playing the first audio stream (track). For them you may simply change the order of audio streams.
For example, suppose you have 1 video stream and 3 audio streams in your input file, and you want to move the 3rd audio stream to be the first of audio streams.
Use
ffmpeg -i input.mp4 -map 0:v -map 0:a:2 -map 0:a:0 -map 0:a:1 ...
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Use FFmpeg:
ffmpeg -i input.mp4 -map 0 -c copy -disposition:a:0 0 -disposition:a:1 default output.mp4
Audio tracks (streams) are numbered from 0.
Supposing the input video has 2 audio streams, and the default audio stream is 0, we need to
remove the “default” disposition from it (by setting it to 0: -disposition:a:0 0) and
set it to the audio stream ...
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According to the wiki, you are likely to get worse results with the default AAC encoder when using VBR. See: https://trac.ffmpeg.org/wiki/Encode/AAC
One suggestion would be to use libfdk_aac. The other would be to demux the audio, re-encode it using a different encoder, and then remux that file back in to the video using ffmpeg.
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