[FFmpeg-user] mix 2 mp4 audio only

Carl Eugen Hoyos cehoyos at ag.or.at
Tue Feb 5 09:39:51 CET 2013

Madovsky <infos <at> madovsky.org> writes:

> ffmpeg -i "rtmp://server/app/live1 live=1" 
> -i "rtmp://server/app/live2 live=1" -i 
> -filter_complex "[0:0]pad=682:450:21:105[left]; 
> [left][1:0]overlay=341:105; [0:1][1:1]amerge" 
> -shortest -y output.flv
> but as I use filter_complex I can't use -acodec copy 
> to avoid decode encoding audio/video

Yes, this is correct.

> and also amerge above create 2.4 s latency between 
> the first and second stream (if I remove amerge it's ok).

Sorry if you already answered this:
Is this problem (that there is an additional latency) 
also reproducible with two files as input?

Carl Eugen

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