[FFmpeg-user] The concat filter and duplicate frames from prores files

[Gyan Doshi]

On 06-08-2018 02:38 AM, Nick Ludlam wrote:

> Is there a likely culprit for this? Something where the audio is fractionally longer than the video, somehow? 

This is likely it.

Try with -vsync vfr i.e.

     ffmpeg -loglevel verbose \
     -i 
/Users/nickludlam/Work/data-ingest/Resolve_prores_422/s1-4-1_004_04_25mm_5.mov 
\
     -i 
/Users/nickludlam/Work/data-ingest/Resolve_prores_422/s1-4-1_004_04_25mm_5.mov 
\
     -i 
/Users/nickludlam/Work/data-ingest/Resolve_prores_422/s1-4-1_004_04_25mm_5.mov 
\    -t 1 -f lavfi -i anullsrc=r=48000:cl=stereo -vsync vfr -pix_fmt 
yuv420p -filter_complex "[0:v] [0:a] [1:v] [1:a] [2:v] [2:a] 
concat=n=3:v=1:a=1[v][a]" -map "[v]" -map "[a]"  -preset fast -c:v 
libx264 -b:v 2000k -c:a aac -b:a 96k /tmp/output.mp4


Regards,
Gyan