How to convert mp4 to h264 adding AUDs using FFMPEG

0
votes

I am trying to convert an mp4 clip to h264 bytestream format using FFMPEG. I have successfully compiled FFMPEG from source with access to libx264.

Looking at the documentation for FFMPEG (version 3.2.2) under libx264 there is a bool flag -aud. In the online documentation it gives the example 

ffmpeg -i input.flac -id3v2_version 3 out.mp3

Using this format, the following command works, but doesn't produce the desired AUDs in the output file:

ffmpeg -i input.mp4 -codec:v libx264 -aud 1 output.h264

I've also tried different variants with this including:

ffmpeg -i input.mp4 -vcodec libx264 -aud 1 output.h264
ffmpeg -i input.mp4 -aud 1 output.h264

etc.

I assume there is something I'm misunderstanding about performing this operation. I basically want to take a h264 movie in an mp4 container and dump it as an h264 stream with AUDs added to it. Any idea why this isn't working?

(I've also tried using x264 with the -aud flag, also ran fine but didn't produce the desired output).

2
ffmpeg

2 Answers

1
votes
ffmpeg -i input.mp4 -x264opts aud=1 output.h264
2
votes

Since MPEG-TS muxer creates AUDs, this 2-step non-destructive process works: 

ffmpeg -i in.mp4 -c copy -map v -vbsf h264_mp4toannexb in.ts

and then

ffmpeg -i in.ts -c copy -map v -f h264 in.h264