[FFmpeg-user] synchronisation problem on encoding video files

[Carl Eugen Hoyos]

Andrei Danila <andrei.danila <at> code932.com> writes:

> /usr/local/bin/ffmpeg -y -i input -isync -async 1 
> -f mp4 -threads 0 -b:v 2500k -s 1280x720 -c:v libx264
> -pass 1 -preset veryslow -tune film -r 24000/1001 
> -an -map_metadata -1 output 
> /usr/local/bin/ffmpeg -y -i input -isync -async 1 
> -f mp4 -threads 0 -b:v 2500k -s 1280x720 -c:v libx264
> -pass 2 -preset veryslow -tune film -r 24000/1001 
> -c:a libfaac -b:a 128k -ar 44100 -ac 2 
> -map_metadata -1 output

Complete, uncut console ouput missing.
Is two-pass encoding needed to reproduce your problem?
Why are you using "-isync"? (What effect is it supposed 
to have?)

Note that -async 1 may have adverse effects on input 
files not needing it.

Carl Eugen