2012/1/13 zhu shi song <span dir="ltr"><<a href="mailto:zhushisongzhu@yahoo.com">zhushisongzhu@yahoo.com</a>></span><br><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div><div style="font-size:12pt;font-family:times new roman,new york,times,serif"><h3><br> </h3><div> 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. <br>
</div><div> The defect causes two unpleasant consequences of user experience:<br></div><div> 1、From user's view, he will be confused by the player because it can't reach the presicely correct position he has specified. <br>
</div><div> 2、The video can't be partially transcoded correctly because -start-time has been changed inside vlc when user passes the value to it. <br></div><div><br></div><div> 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:</div><div>' 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)' .</div><div>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.</div></div>
</div></blockquote><div><br></div><div>Most decoders only support fast I frame seeking. But usually long I frame distances (like 250 frames) are only used in H.264 videos, so most other videos should have fast seeking accuracy of ±2 seconds. </div>
<div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div style="font-size:12pt;font-family:times new roman,new york,times,serif"><div><br></div></div></div>
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