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View Full Version : Frame Type Indicator for Xvid/Divx Streams

kilg0r3
14th March 2003, 21:05
Except for K-frames Vdm does not indicate the frame type for Xvid movies. Is this a problem of Vdm or of the Xvid.dll?
fccHandler
15th March 2003, 05:47
It's a problem of Video for Windows. B-frames are handled internally by XviD and DivX, because the VfW interface only states whether a frame is a key frame or a dependant (non-key) frame.

However, I've heard that this limitation is being examined by the VirtualDubMod developers, so you may see B-frame detection in a future version of the mod.
Belgabor
15th March 2003, 22:03
If you have access to the xvid stats file used to create the avi you can load that and it will show the frame type reported there.
ChristianHJW
16th March 2003, 04:30
... matroska has a special field for frame types, IIRC we can indicate/differentiate 16 different frame types. Of course, this field is NOT being used in VfW compatibility mode, only I/P fames have to be marked. When encoding a movie directly into matroska, and using the MPEG4 'native' modes, you could set this flag correctly when reading some codec output, but this is not supported by VfW again, so you had to hack XviD.dll into Vdub using dynamical or statical linking.

So, in case you want to transmux an AVI with b-frames into matroska and you want to convert it into a video stream being in 'native' mode, you need a decoder so you can tell what type is every frame ....

In principal, you could 'abuse' matroska's frame type field even for streams written in AVI/VfW compatibility mode, if you make a simple app reading the stats file and setting the flag accordingly, even after the encoding is finished ..
kilg0r3
16th March 2003, 11:06
Originally posted by Belgabor
If you have access to the xvid stats file used to create the avi you can load that and it will show the frame type reported there.

This is going to be my dumbest question ever:

(How) can I load a stats file into vdm? :stupid:
Didée
16th March 2003, 18:59
Pssssst ...

Menu: Options
kilg0r3
16th March 2003, 19:55
ok, haha, you can stop making fun of me now. And, btw, where is that stupid camera?

I don't get it. Please Mods rest mypost count. This is too embarassing :o
mf
16th March 2003, 22:41
Originally posted by ChristianHJW
... matroska has a special field for frame types, IIRC we can indicate/differentiate 16 different frame types. Of course, this field is NOT being used in VfW compatibility mode, only I/P fames have to be marked. When encoding a movie directly into matroska, and using the MPEG4 'native' modes, you could set this flag correctly when reading some codec output, but this is not supported by VfW again, so you had to hack XviD.dll into Vdub using dynamical or statical linking.

So, in case you want to transmux an AVI with b-frames into matroska and you want to convert it into a video stream being in 'native' mode, you need a decoder so you can tell what type is every frame ....

In principal, you could 'abuse' matroska's frame type field even for streams written in AVI/VfW compatibility mode, if you make a simple app reading the stats file and setting the flag accordingly, even after the encoding is finished ..
Who asked anyone about matroska ?
The only reference to what version of virtualdub is "vdm" (being virtualdubmod), and not "matroskadub". So your post is pretty much useless.
Offtopic!
Belgabor
17th March 2003, 00:03
It's Tools -> Open Stats file... :p

In the OPtions Menu you can only set the Tick display.
Didée
17th March 2003, 01:45
Originally posted by Didée
Pssssst ...

Menu: Options

[/kickingmyasskickingmyasskickingmyass]

Seems I forgot my brains somewhere today: Of course I wanted to type 'Tools', dunno how it finally turned out as 'Options' :stupid:

Sorry kilg0r, didn't intend to bug you!
fccHandler
17th March 2003, 09:21
Originally posted by ChristianHJW
... matroska has a special field for frame types, IIRC we can indicate/differentiate 16 different frame types...
Errm, why only 16?
kilg0r3
17th March 2003, 09:56
giggle ....

hihihi what a mess. btw, i well could have been but i wasn't 'narrow' enough to not look through the other menues. so why didn't i find the entry? yes, I hadn't the prerelease version installed.

This is great, during the last hours I was on the verge of posting screen shots of the vdm menues .... :D
ChristianHJW
17th March 2003, 19:44
Originally posted by fccHandler
Errm, why only 16?
Sorry mate, i am not allowed to answer, i'm Offtopic ;) ....
mf
20th March 2003, 15:15
Originally posted by ChristianHJW
Sorry mate, i am not allowed to answer, i'm Offtopic ;) ....
Good boy :D.