[FFmpeg-user] amerge problem with 2-pass encoding

Carl Eugen Hoyos cehoyos at ag.or.at
Wed Jun 26 18:04:35 CEST 2013

Alex <doenerbudenchef <at> yahoo.de> writes:

> ffmpeg -y -i test.mxf -filter:v yadif -s "1920x1080" 
> -aspect 16:9 -r 25 -b:v 8000k -bt 8000k -vcodec libx264 
> -pix_fmt yuv420p -f mp4 -pass 1 -fastfirstpass 1 -an 
> -ss 00:00:00 test.mp4 && ffmpeg -y -i test.mxf
> -filter_complex "[0:1] [0:2] amerge"

(Sorry, I originally misread your command.)

Could you test identical command lines (except for "pass n") 
for both passes? I suspect that there are cases when you 
cannot simply skip audio on the first pass with -an.

Carl Eugen

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