View Single Post
Old 22nd March 2011, 19:35   #17  |  Link
roozhou
Registered User
 
Join Date: Apr 2008
Posts: 1,181
Quote:
Originally Posted by eathasa View Post
Ah, well, that would explain it
Next question: Why is it necessary to set both the sample aspect ratio and the display aspect ratio -- if either one is honored, the other is a given. Is there a reason that both values are stored and can be inconsistent with each other?
Because sar is not always honored by players. Some players (e.g. QuickTime) requires a valid DAR value in MP4.

IMO DAR should not be set unless there is no place to put sar in the bitstream(e.g. WMV3). So ffmpeg build from my fork does not write DAR for mkv since no player requires DAR in MKV.
roozhou is offline   Reply With Quote