[FFmpeg-user] Replacing an audio stream in an MP4

[Gyan Doshi]

On 5/7/2018 6:26 AM, Dan Bridges wrote:

> 1. Is this the most efficient way to perform this task?  Could I mux the
> AVC stream in test.mp4 with the AAC stream in replacement.mp4 without
> first demuxing them. That is, could this all be performed in one FFMPEG
> command?

No need to demux to separate files first.

     ffmpeg -i test.mp4 -i replacement.mp4 -map 0:v -map 1:a -c copy 
replaced.mp4

This will also be devoid of the PTS msgs, which were due to your use of 
.h264, which is a raw stream without timestamps.

Regards,
Gyan