The VideoLAN Forums

Hey, since I last posted in the froums, my old duron@892 Mhz went to my sister and my main box is faster, so i went and downloaded a few mHD files.

With one (an mkv of about 832*something res), i got a strange frame skipping issue during the intro, black background, red letters. When the text dades to black, a few frames are skipped. Also whn a character goes under a bridge and the scene fades to black because of the light changes, it skipps some frames.

It seems not related to viewtopic.php?f=14&t=59354&p=199190 .
Vlc 1.0 rc1 DOES use more cpu on the 2 h.264 files i tested, but when the frame skipping occurs on this one the cpu usage drops quite a bit (eg: it's close to 33% and on the frameskipping it drops to about 11%).

An old mplayer svn trough mplayerui did not have this issue, but the quality of the video was by far superior on vlc.

This happens with 0.9.8a, 0.9.9 and 1.0 rc1 as far as i know. Disabling the loop filters did not seem to fix the problem. Since that often allows people with older procesors watch full hd video, i really don't understand what may be going on. Any pointers will be apreciated.

I'll post more details about the file when I get home.

My specs:
pentium 4 2.40 GHZ
512 MB ram
Windows XP sp3
Zogis Nvidia Geforce 5500 fx based video card

Hey, I came back with some info on the file (all taken with vlc 1.0 rc1).

Codec Info:


Message log plus:

Hope this helps...

Could you share us the problematic file or small sample from it?

Sure, i'll try to cut a sample when I get home. Hopefully avidemux can deal with the files and i won't have to hunt for another app

Here it is, uploaded to rapidshare (no password): MKV Merge gui was able to do the job .

main warning: late picture skipped (4000 > -4047)
main warning: late picture skipped (39000 > -4001)
main warning: late picture skipped (2000 > -4250)
main warning: late picture skipped (39000 > -3750)
main warning: late picture skipped (2000 > -3812)
main warning: late picture skipped (419000 > -2521)
main warning: late picture skipped (378000 > -2521)
main warning: late picture skipped (340000 > -2890)
main warning: late picture skipped (304000 > -2890)
main warning: late picture skipped (268000 > -2890)

I get lots of messages like that when problem shows up. I assume it is some sort of decoder issue that hopefully gets solved during next libavcodec update.

Ok.
When do you think it'll happen? 1.0 final?

Just to be sure i installed the latest "mplayer for windows" package from mulder's page (dated 5/18/2009), and it also plays those parts fine.

Yep, there are still problems with some H264 videos.

These troubles are known and reported:
https://trac.videolan.org/vlc/ticket/2671
https://trac.videolan.org/vlc/ticket/2670

It seems that there might be many things involved (CPU usage, filters, splitters, slices, files with many ref frames and/or B frames) so let's give the devs some time to cure them and hopefully it will be fixed for v1.0.0 release

Damn.... Well, I'll just wait then. I don't have that many h.264 videos yet.

Just to keep you guys posted, It seems to still happen with 1.0.5, but it's noticebly not as much as before. So, we have an improvement. Yes, still happens when disabling loop filters.
If anyone wants it, I still have the sample I'd cut lying around and can re-upload it.