Virtual. Dub documentation: Capture - virtualdub. How fast of a CPU do I need? This is a hard question to answer, but I can tell you what I've been able to do: Celeron 3. Hauppauge Win. TV, 4. KHz 1. 6- bit stereo PCM, 6. YUY2 at 2. 9. 9. 7 fps compressed with Pic. ![]()
Video at quality 1. Pentium III 7. 33, Hauppauge Win. TV, 4. 4KHz 1. 6- bit stereo PCM, 6. YUY2 at 2. 9. 9. 7 fps compressed with Huffyuv in Predict Median, Preview on. Note that these are with a 1. Virtual. Dub needs a Video for Windows capture driver to capture. Most Firewire (DV) devices do not provide a VFW driver, and thus cannot be used by Virtual. Pinnacle - Dazzle* Hardware Installer for Studio 10 look-up chart. I just bought a new computer and I'm trying to install Studio 18. I get a pop-up window saying "Can't continue because Pinnacle Studio requires Vista Service Pack 2". ![]() Dub at all. Also, ATI appears to be shipping their current devices with a WDM (Windows Driver Model) driver only; this can be used indirectly by Virtual. Dub through a Microsoft wrapper, but it is crippled in functionality and it also appears that the wrapper is buggy. The wrapper will show up as . Video for Windows only captures audio through a sound device; with DV, the audio is interleaved with the video itself. I don't have any DV specs, so I can't make Virtual. Dub extract the audio. I get no sound. First, check that you aren't missing the pass- through. Next, bring up Volume Control (sndvol. Properties, then switch to Recording controls. Finally, if you have a Hauppauge Win. TV, check for an AUDIOSEL. ![]() ![]() ![]() ![]() ![]() EXE application on your hard disk or driver CD. No one has a rock- solid answer for why these problems occur, but it appears to be caused by contention on the PCI bus, which then prevents the sound card and video capture devices from emptying their buffers in time. Also, check the websites for the hardware manufacturers to see if they have utilities which may help. If you are using RGB2. YUY2 to drop your raw datarate by 3. PCI bus load to workable levels. I see a greyish, wavering line at the bottom of my capture. It looks sort of like the picture, but distorted. If it's only a few lines at the bottom, it's likely VHS head switching noise. Ignore it or crop it out afterward. I see a lot of thin lines in my image, like a comb. That's interlacing - - what you're seeing is two fields, taken at slightly different times, and combined together to form a single frame. You'll see it whenever you capture with a height more than 2. NTSC) or 2. 88 lines (PAL). Interlacing is not a defect in the video and cannot be ? Ultimately, you will need to choose a format which is compatible with the codec, but if you have a choice, always choose YUY2, UYVY, or YVYU over RGB2. Choosing YUY2/UYVY/YVYU over RGB2. Huffyuv. RGB1. 6 introduces horrible banding and signal loss, while RGB3. RGB2. 4. This following only applies to devices based on the BT8. A) or BT8. 78(A). NTSC video is composed of alternating fields of 2. PAL/SECAM of 2. 88. The BT8x. 8(A) can only DMA to one destination at a time, and the output pixel format can only be set on a per- field basis. It's likely that the other people are dealing with a PAL (Phase Alternating Line) standard, while you are dealing with the NTSC (National Television System Committee) standard. You can only use codecs which are compatible with the current capture format, so try changing the capture format in the Video Settings or Video Format dialogs. RGB formats will give you the widest selection; YCr. Cb (YUV) formats will whittle the list down, and exotic formats such as VCR2 or MJPG will usually clear the list. This restriction is necessary because the format may require hardware assist to decode, and it may be impossible for Virtual. Dub to decompress the video during capture in order to transcode to another format. What's the difference between compatibility mode and normal (internal) capture? Compatibility capture mode (F5 key) is a no- frills, straight Video for Windows capture - - it lets Video for Windows do as much work as possible and is the failsafe mode you should use to diagnose problems when regular capture mode doesn't work. It has a number of disadvantages: Timing correction is disabled, so audio on long captures may be out of sync. The capture file will be invalid if it exceeds 2. GB. Only one capture file is allowed - - no multisegment captures. Virtual. Dub won't be able to display the compressed video frame size. Video filtering options that change the size of the frame aren't allowed. Disk I/O is buffered, so you may encounter problems when pushing the limits of your hard disk bandwidth. It's basically like Vidcap. Use normal capture mode (F6) when possible. If you find that you can't capture even in compatibility mode, chances are something is seriously wrong with your system configuration. The audio isn't in sync in the capture file. It's what we get for putting audio and video capture on separate clocks. If you are running Virtual. Dub 1. 4c or earlier, check the Knowledge Base for a possible workaround if your sound card isn't very accurate. This is a nasty way to get audio in sync, because it will make editing harder - - to coerce the clips to a single frame rate for rendering, frames will have to be dropped or duplicated. Perhaps one of: Insufficient CPU power. If you're running near the limits (> 9. CPU), then you can sporadically drop frames when busy scenes pass by. Slow hard disk. Note that most hard disks cannot handle capturing full frame, uncompressed video; that requires 1. MB/sec for 1. 6- bit RGB/YUY2 and 2. MB/sec for 2. 4- bit RGB, not counting filesystem and seek overhead. Also, if you don't have DMA set on an IDE disk, you'll get slower performance than usual and additionally will load the CPU significantly during disk access, often by 4. Bus bottleneck. Bad source, such as VHS video tape, or a signal interruption such as changing the channel. Timing correction necessary to keep the audio synchronized. Most sound cards will deviate a small fraction from the video capture device, requiring that a few frames be dropped to keep the audio in sync. Another possibility is that the source is outputting a slightly slow or fast frame rate; old videotape can do this, as well as game consoles. The key to remember is that one dropped frame per thousand is nearly indescernable, but ten dropped frames at a single point is. Why does my video capture stop at 1 hour, 1. I still get audio? This is a bug in many video capture drivers. The exact limit is actually 2. Many TV tuner devices are susceptable to this bug, as are the miro/Pinnacle DCxx devices; you may be able to fix the problem simply by upgrading to the latest capture drivers. There are two incarnations of this problem. In the non- fatal version, video frames are still sent to the application, but the timestamp on the video stream starts over from zero. Virtual. Dub will correct for this problem automatically, allowing you to capture beyond 7. The other possibility is that the driver stops sending data altogether. Virtual. Dub will notify you if this occurs, but will not be able to capture past 7. Vanilla capture devices based on the Conexant/Brooktree BT8. I'm told that the bug in Pinnacle's DC3. As of this writing, the bug in the DC1. There are apparently a few drivers that are even susceptable to half this limit (3. You'll get this problem if you either (a) are running Windows 9. SE/ME, or are saving to a FAT3. Either limits you to 4. GB. If you want to capture a single file bigger than 4. GB, you must have your capture partition formatted as NTFS and you must be running Windows NT/2. The error message itself is caused by Windows, and not by the limitations of the AVI file format. So how do I capture more than 4. GB? You must do all of the following: Use normal capture (F6 key) and not compatibility mode capture (F5 key). Check Capture/Enable multisegmented capture. Add one or more drives to Capture/Spill drives. Set the thresholds to 5. MB, and make sure you use a full path (i. E: \ and not E: ). Also, set priority of all drives to 0 to avoid a bug in V1. Virtual. Dub will then capture in segments to a bunch of 2. GB files. How do I change the channel or capture in MPEG- 1/2? You can't - - this functionality isn't available through the Video for Windows capture interface. The application that comes with your capture device can do it because it uses a proprietary interface that other programs can't use.
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