[vlc-devel] WMV2 timestamp positioning problem in vlc-1.2.0-pre4
zhu shi song
zhushisongzhu at yahoo.com
Fri Jan 13 06:13:06 CET 2012
I use vlc-1.2.0-pre4 to test some WMV2 videos, I find that vlc 1.2 can't position timestamp correctly when I seek the video.
The defect causes two unpleasant consequences of user experience:
1、From user's view, he will be confused by the player because it can't reach the presicely correct position he has specified.
2、The video can't be partially transcoded correctly because -start-time has been changed inside vlc when user passes the value to it.
I doubt the problem is from ffmpeg. I test the video using ffplay. It has the same problem. I report it to ffmpeg bug track. Cehoyos responsed the problem with the following words:
' For most videos, media players can only seek to keyframes ("I-frames"),
they cannot seek to non-keyframes (all other frames), if they seem to
allow to seek to non-keyframes, they do it by seeking further back and
not displaying the frames in-between (this can be different for H264,
but your sample is WMV2)' .
I wonder whether TS has the same mechnanism with WMV2. If vlc 1.2 can now control timestamp of TS video correctly, it should fix the problem in WMV2 seeking problem.
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