[FFmpeg-devel] [PATCH]Mention in the documentation that fieldmatch needs cfr input

Carl Eugen Hoyos cehoyos at ag.or.at
Wed Oct 29 17:21:41 CET 2014

Calvin Walton <calvin.walton <at> kepstin.ca> writes:

> For content that was in mpeg2 with field flags set 
> appropriate for display on an interlaced TV 

This is unrelated to this issue:
FFmpeg simply ignores the flag and interprets the 
input as progressive.

> which basically accounts for all DVD content

I live in PAL-country but from user reports and 
samples (like the one in question) I know that 
this unfortunately isn't true;-(

This whole issue is about vob files that contain 
both progressive 24000/1001 and (hard-) telecined 
30000/1001 video in the same stream (with actual 
switching frame rates).
It appears to me that decimate should detect the 
frame rate changes and not drop anything for the 
progressive content.

Carl Eugen

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