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by corobo 3172 days ago
That always results in desynced A/V whenever I try it.

Usually lots of errors like the following from ffmpeg, then the audio is about a second behind the video

[mp4 @ 0x98668b4620] Non-monotonous DTS in output stream 0:1; previous: 132227, current: 131204; changing to 132228. This may result in incorrect timestamps in the output file.