[FFmpeg-user] Quicktime DV MOVs - 2 different SAR informations

[Carl Eugen Hoyos]

Christoph Gerstbauer <christophgerstbauer <at> gmx.at> writes:

> Fileprobe 1:
> a.) 720x576 [SAR 16:15 DAR 4:3]
> b.) SAR 59:54 DAR 295:216

> Fileprobe 2 has
> a.) 720x576 [SAR 64:45 DAR 16:9]
> b.) SAR 118:81 DAR 295:162

> When I use "-show_frames" the video frames 
> have the same SAR like in the "b.)"s.
> But where do the right SAR values (which are 
> place in brackets) come from?

Why do you believe that one SAR value is "right" 
(and the other wrong)? Both are stored in the 
file, one in the container, one in the video 
stream.

(Of course one is correct and the other one 
isn't but FFmpeg cannot know.)

Note that in your examples, the difference 
is negligible afaict; unfortunately there are 
samples where the difference is immediately 
visible.

Carl Eugen