Re: [FFmpeg-user] Why _COPYing_ a variable encoded audio (AAC) channel will produce a variably encoded one?

Hello Sophoklis, Short version: I strongly suspect the audio data was copied directly and simply. I strongly suspect it is bit-for-bit identical audio data, it was not decompressed and recompressed with different settings. Advice for you: I am not sure this is the case, we will have more

Re: [FFmpeg-user] Why _COPYing_ a variable encoded audio (AAC) channel will produce a variably encoded one?

2018-02-28 13:40 GMT+01:00 Sophoklis Goumas : > I have a .3gp file containing a video and an audio channel. > > I'm trying to get the audio channel in a separate m4a file but when I issue: > ffmpeg -i foo.3gp -vn -c:a copy foo.m4a Complete, uncut console output

[FFmpeg-user] Why _COPYing_ a variable encoded audio (AAC) channel will produce a variably encoded one?

Hello. I have a .3gp file containing a video and an audio channel. I'm trying to get the audio channel in a separate m4a file but when I issue: ffmpeg -i foo.3gp -vn -c:a copy foo.m4a I get a constantly encoded AAC audio channel while the original was a variably encoded one. In more detail,