[Matroska-devel] Re: Matroska video blocking problem

Steve Lhomme steve.lhomme at free.fr
Wed Oct 19 18:22:07 CEST 2005


I forward this email to our ML where Haali (who makes our splitter) will 
be able to read it. It sounds like your file only "indexes" the first 
video track and not the other one. Matroska (the format) can support 
index on all tracks, even partial index (called Cue). Maybe you're 
missing a command-line to do that or it's a bug in the muxing program 
(mkvmerge ?) or Haali's splitter that uses the wrong index for this track.

Andrew Bromwich wrote:
> Hi Steve,
> I have been having some problems with what i believe is with the 
> Matroska splitter. I wasnt too sure if posting a bug on the corecodec 
> wesite was the best option or emailing you (so i just emailed you, sorry 
> if this is incorrect).
> The problem I am having is that I have some video files, with a number 
> of video streams (normally 4 streams) and an audio stream, but when the 
> video streams are seeked through i get a large amount of blocking (or 
> periods of video freezing depending on video decompressor) on the 2nd, 
> 3rd and 4th stream. I did quite a lot of testing with a number of 
> different compressors and decompressors but with the same results. The 
> first screen always seems to work great which is really what is throwing 
> me off! I have not personally really got into the insides of the 
> Matroska splitter or muxer but am guessing that it might be some sort of 
> buffer that has been optimised for single video stream playback?? This 
> problem wouldnt be so much of an issue but the software I am developing 
> requires a fair bit of skipping through the video file, then every time 
> i seek it either blocks up or freezes altogether until the next 
> key-frame comes along.
> I have also tried a fair amount of testing using a number of different 
> settings with the video compressors i have been using (w.r.t keyframe 
> rates) but this really doesnt seem to make much difference to the 
> outcome either.
> I do appologise if i have emailed the wrong person (if this is the case 
> can you please point me in the direction of someone who might be able to 
> help).
> Thankyou,
> Andrew

robUx4 on blog <http://robux4.blogspot.com/>

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