Am 26.12.18 um 15:08 schrieb Reino Wijnsma:
Stream #0:0: Video: h264 (High), yuv420p(progressive), 688x560 [SAR 64:45
DAR 2752:1575], SAR 172:121 DAR 7396:4235, 50 fps, 50 tbr, 1k tbn, 100 tbc
(default)
What does SAR (and DAR) mean in the brackets compared to the second SAR
172:121, which is slightly different?
As far as I know:
688 x 64/45 = 978,49w
978,49 x 1575/2752 = 560h --> 978x560 @ bitstream level
688 x 172/121 = 977,98w
977,98 x 4235/7396 = 560h --> 977x560 @ container level
So when I understand correctly, it could be that somewhere in ffmpeg,
the 64/45 is rounded to 978, given to another function / class
calculating the SAR for the container level, and this calculates to
172/121, which is best matching for 978?
Instead, the better solution would then be to give the SAR to whatever
calculates the SAR to store at container level not as a double or int,
but as a "AVRational", which contains the "num" and "den" values (in
this case 64 and 45)?
Could this be done, or is there a reason not to do that?
Regards,
Uwe
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