[FFmpeg-user] Image extraction broken with ffmpeg, but not with mencoder. How can I fix this?

James Board jpboard2 at yahoo.com
Wed Sep 4 22:46:12 CEST 2013

>> I understand the fact that if the output is cfr and the input is vfr, then

>> some frames may need to be duplicated or dropped.  But if the output is
>> merely a sequence of images, why does this matter?  There's no frame rate
>> in a sequence of images,
>Except it is. What you are using is not simple & dumb frame extraction tool.
>So before making such assumptions consult documentation.

I consulted the documentation.  It doesn't explain why how '-vsync 0' stops
ffmpeg from artificially inserting duplicate frames into your output image files.
If you think the documentation does explain this, them point out which sections

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