[FFmpeg-user] Issue with A/V sync due to dropped frames

Carl Eugen Hoyos cehoyos at ag.or.at
Fri Apr 15 00:39:11 CEST 2016

Mark Huang <mmhmmh <at> gmail.com> writes:

> *ffmpeg -rtbufsize 100M -probesize 32 -debug_ts -y -threads 4 -vsync vfr

I don't think -vsync vfr is supposed to work with mp4 output.

> -async 1 -f avfoundation -s 640x480 -r 30.000000 -video_device_index 0

Why are you using -async 1?

Carl Eugen

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