What should I set for VBV for my (X)SVCD?

[puertorican138]

When I tried multi-plexing with TMPGEnc, I got an error about Buffer Underflow. I'm trying to create an (X)SVCD. What should I set the VBV to? Should I raise it?

Here are my file details for my (X)SVCD in TMPGEnc:


Stream type: MPEG-2 Video
Size: 352 (Horizontal) X 240 (Vertical), 352X240
Aspect ratio: 4:3 Display
Frame rate: 23.976 fps (internally 29.97 fps)
Rate control mode: 2-pass VBR(VBR)
Average bitrate: 1000
Maximum bitrate: 3000
Minimum bitrate: 300
VBV buffer size: 112
Profile & Level: Main Profile & Main Level (MP@ML)
Video format: NTSC
Encode mode: 3:2 pulldown when playback
YUV format: 4:2:0
DC component precision: 10 bits
Motion search precison: High quality (slow)


Note: I have an APEX AD-1500 Player.

[puertorican138]

Can anybody help???

[jkl]

i've never had that problem but try setting bffer to 2000 then try.

[puertorican138]

2000 . That's way too high.

[BabyHuey]

Can anyone tell me what the VBV Buffer Size is. Is the buffer size used to burn the disk, is it a setting the controls how big a buffer your player uses? I am a little lost so please forgive the stupid question. But I have searched for it, looked at the help menues of vcdeasy, etc. No luck.

[DJRumpy]

Modify it at your own risk. If you set it too high, or too low for your player, you'll get a coaster.

Off the digvid.info site:

VBV buffer size
This value specifies the size of the decoders "Video Buffering Verifier". It represents the amount of coded video data that can be buffered by the decoder. At constant bitrates the buffer allows best use of the MPEG compression techniques. It is filled at a constant rate (that of the video stream) and partially emptied when a frame is decoded. The buffer fills up during sequences that compress well and empties during sequences that do not compress well.

Usual values are 40 for producing an MPEG-1 VCD and 112 for an MPEG-2 SVCD. These are the minimum allowed by the specifications, but if you are encoding for a particular player it may have a larger VBV buffer, so these could be increased (producing XVCD or XSVCD discs).

[wulf109]

Guides I've read say set it zero which allows Tmpeg to automatically assign the buffer rate.

[puertorican138]

Modify it at your own risk. If you set it too high, or too low for your player, you'll get a coaster.

Off the digvid.info site:

VBV buffer size
This value specifies the size of the decoders "Video Buffering Verifier". It represents the amount of coded video data that can be buffered by the decoder. At constant bitrates the buffer allows best use of the MPEG compression techniques. It is filled at a constant rate (that of the video stream) and partially emptied when a frame is decoded. The buffer fills up during sequences that compress well and empties during sequences that do not compress well.

Usual values are 40 for producing an MPEG-1 VCD and 112 for an MPEG-2 SVCD. These are the minimum allowed by the specifications, but if you are encoding for a particular player it may have a larger VBV buffer, so these could be increased (producing XVCD or XSVCD discs).

Great explanation!!! :P

[puertorican138]

wulf109, I agree with you. I always set my V.B.V to 0 (autamatic) in TMPGEnc and have never had problems. :P

[DJRumpy]

Auto mode (0) will give you the same settings as above, and will stick to spec. I agree. Leave it on 0, or if your not using TMPGenc, use the settings above per spec.