Missed frames in Xvid 1.0 rc1

[LowTech]

Hi,

just dealing with some MPEG2 issues of Pinnacle Studio software. A little 10 sec DV test clip, with 250 numbered frames, helped a lot. Got following problem after converting this small video to avi (with VirtualDubMod 1.5.4.1 and Xvid 1.0 rc1):

- using no B-VOPs -> the resulting avi is complete and has all 250 frames
- with 1 max consecutive B-VOPs -> the avi is complete too
- with 2 max consecutive B-VOPs -> last frame is missing, avi has 249 frames
- with 3 max consecutive B-VOPs -> last two frames are missing, avi has 248 frames
- with 4 max consecutive B-VOPs -> last three frames are missing, avi has 247 frames

A interesting point seems to be, that the last two (missed) frames are key-frames! Tried to attach the clip (~500kb), but forum did not allow. I can mail it on request.

[mikeX]

AFAIK this is a virtualdub(mod) issue, it doesn't hack it's way around multiple xvid b-frames correctly

[LowTech]

Replaced VDM by Pinnacle Studio. Again with 3 (and 4) max consecutive B-VOPs. Got now 250 frames. But four (five) times the first frame and without the last three (four) frames!

Is there any program, we can trust in encoding whith xvid and b-frames?

BTW, the video has 248 black frames with big green counting numbers. Frame 249 is red and the last one is yellow. Without b-frames the xvid encoder decides to make the last two frames as key frames.

[Ark]

AFAIK AVS2AVI is the only choice to solve this

I've tested AVS2AVI and it encodes all frames even in movies with more than 1 consecutive B-VOPS

I hope this can help you, I haven't now the link to get AVS2AVI, but a small search in google should solve all!:)

[buzzqw]

google response : http://daveel.leffe.dnsalias.com/

bye

BHH

[LowTech]

Big thanks to all!

Just converted the clip with AVS2AVI and got 250 perfect frames. I am only unsure if it took the (in VDM last used/changed) xvid options? There is an command line switch to load xvid settings from a file, but I have no idea how this file should look like.

[Maurizio]

Such a file is generated by the same program with the -s option.
If you issue the command :
avs2avi file.avs file-avi -s params.xxx
then you can subsequently start it whith the command
avs2avi file.avs file-avi -l params.xxx
Regards
Maurizio

[LowTech]

Thanks Maurizio .. got it :)

[mikeson]

@LowTech:

You can safely use VirtualDub <= 1.5.4.

[LowTech]

.. sorry mikeson, but in my tests VD 1.5.3 and 1.5.4 missed the same frames like VDM 1.5.4.1.

[lamer_de]

I just encountered this bug aswell with RC3.
Processing chain was

avisynth 2.54 (Jan 26th)
Virtualdubmod 1.5.4.1 (build 2066)
XviD-1.0-RC3-29022004.exe from Koepi


Got a video with the last frame missing when using 2 b-frames.
Anybody knows if this is an avisynth, vdubmod or xvid issue?

I don't remember encountering this problem with the alpha version of xvid, so my guess would be xvid is the culprit (or rather the communication between vdubmod and xvid), but I didn't investigated this in extensio, so I might be wrong :D

Using avs2avi to re-encode the video now, let's see if I get the missing frame back ^_^

CU,
lamer_de