Capturing In Virtual Dub

[Down1oader]

hi im capturing tv through my wintv hauppauge theatre card my problem is, is tht when i choose mp3 for audio it always crashes the program, i can record perfectly with pcm, nebody help me out here ? thnx in advance

[spooky]

Which MP3 codec are you using, try Lame MP3 Codec, also what codec are you using to capture your video? Maybe the CPU is working too hard on the video encoding. The only other thing I can think of is make sure you have the latest Creative drivers for your Creative Live card.
HTH

[crahak]

Recording straight to mp3 is problematic for lots of people, will cause async sounds sometimes... PCM works good anyways. As well, the mp3 codec that comes with the creative card interferes with other mp3 codecs at times. (It made my encodes stop at frame 9995 time after time till I found out the culprit)

[Down1oader]

rite video codecs i use are huffyuv 2.1.1 which uses 40% cpu, picvideo mjpeg which uses %50 cpu, both ive used with the format 352x288 RGB 24 bit. PCM Cd quality audio doesnt add anything to my cpu load. i know i have lame installed because i installed it, so i go to the format and change it to Mp3 (i cant see anything saying lame or any other mp3 codecs which im sure i have) i then try a variety of bit rates from lowest to highest and as soon as i start it capturing virtual dub says it has encountered a crash in one of its routines and tells me to restart the program and computer. pls help cuz i onlg have 4Gb left on my pc so i need to compress on the go, this might mean buying a new hard drive!!!!

[Down1oader]

i also now have another problem, when i go to set form at at 720x576, it says error unsupported video format, and thn when i go to capture it says, error out of memory for video buffers, does all this mean im gonna have to get a bigger hard drive and proper real time capture card?, oh yea dont forget to answer my other qs above, thnx in advance

[Down1oader]

i wouldnt mind a little help here!!!!

[zuberal2]

Excerpt from VDub documentation at http://www.virtualdub.org/docs_capture. (assuming your familiar errors are in VDUB)

Why do I get errors when I try to capture with a height above 240 (288 for PAL/SECAM)?

This following only applies to devices based on the BT848(A) or BT878(A).

NTSC video is composed of alternating fields of 240 scanlines, and PAL/SECAM of 288. If you specify a height equal to or lower than that, the capture driver only snags one field. If you specify a taller image, both fields are grabbed. In either case when you specify a size smaller than the height of the field(s) captured, the result is then scaled down.

The BT8x8(A) can only DMA to one destination at a time, and the output pixel format can only be set on a per-field basis. If you specify Overlay mode, then the capture driver will instruct the chip to DMA one field to memory for capture, and the other field to the video card. The catch is that if you are capturing both fields, both DMA lists have to point to main memory. This means that overlay mode is impossible when both fields are captured, and depending on your exact driver, you will either have overlay disabled when the capture starts, or, as is more often the case, get a cryptic error about being out of memory. Note that this is not a bandwidth issue -- you can capture 640x240 in overlay mode, but not 80x480.

To "fix" the problem, specify Preview mode; this unfortunately is slower since the CPU is now doing a blit from the captured frame to the video card. It may be that your system is not fast enough to handle this, in which case you will need to disable the video preview entirely and capture blind. A secondary consequence of all of this is that you see exactly what is being captured in Preview mode, while you are actually seeing the other field in Overlay. If you have a strange source where one field is much cleaner than the other, it is possible with an Overlay display that you will see a clean display on screen and end up capturing crap. (I have had this happen.)

This may not apply to you if you have such a chip built onto your video card, since in that case the chip can DMA into video memory, and then other video hardware can transfer from there into main memory for capture.