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A key feature for a capture device is the card s ability to provide various color formats via hardware processing Host processing tasks often have preferred formats For example, the Windows media codec internally uses the IYUV format (this is the same as I420 in Table 53) If a user were using this codec and chose to capture images in an RGB format, then the capture device would first color-convert YUV 4:2:2 to RGB, and then the host encoder would have to convert these RGB data back to YUV as well as subsample the images down to YUV 4:2:0 If the user plans on editing capture footage before encoding, in this example it would be best to capture the video in YUV 4:2:2 because this is probably the native pixel format of the source video signal Editing could be done in YUV 4:2:2 space, and then later this material could be subsampled down to YUV 4:2:0 and used by the encoder
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Resolution and Capture Rates
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Another core feature used to define a capture device is the video data rate and resolutions at which the device can provide video to the host for further processing (Figure 55) While this is truly a key measurement, it is probably the most difficult to nail down because there are a number of system components that affect this measurement An analog or digital video signal enters a video capture device that captures these data to memory The locations into which video frames are typically captured are memory buffers provided by a host application Once the data are captured into a memory buffer, the video device returns the memory buffer to the host application, where the buffer is processed further (perhaps saved to disk or encoded for streaming purposes)
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Figure 55 Video flow into a capture device
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Credit: Osprey Video Division for the ViewCast Corporation
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Audio/Video Capture Devices: The Second Component of Quality
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The First Bottleneck: Device-to-Host Memory Capture Speed
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The speed at which video can be captured from the device to host memory is the first potential bottleneck For example, due to the limited bandwidth associated with USB 10, many USB video capture devices can only transfer 320 240 sized images to the host and perhaps only at 15 frames per second (fps) Some USB video capture devices may attempt to get around the bandwidth issue by compressing video in the device itself and then decompressing the resulting data stream on the host While this may allow for larger resolutions at faster rates, the quality of the resulting video suffers (It had to be compressed and then decompressed) In addition, precious central processing unit (CPU) cycles are used on the host for the decompression in order to provide the application with its requested color format PCI-based devices are not as limited in bandwidth as are USB devices, but even some PCI-based capture cards do some form of compression in hardware and decompression in software in order to capture fullresolution images Some video capture cards even may provide to the host application what appears to be full-resolution video but is, in fact, a line-doubled or scaled single field of video Even PCI capture devices that can capture full resolution and full rates to the host can be at the mercy of other devices on the PCI bus because all devices on the bus roughly share the bus s bandwidth It is critical that a PCI capture device is able to direct memory access (DMA) video it is capturing into memory DMA uses little, if any, CPU resources to move video from the device into memory DV over an IEEE-1394 device normally does not have bottleneck issues in terms of the transfer to host memory Thus every DV frame, at full resolution and full frame rates, can be captured to host memory However, DV is a compressed format and is not readily usable by most streaming encoders without some additional CPU processing on the DV data, as follows:
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First, the DV data stream will need to be decompressed, producing a 4:2:0 or 4:1:1 YUV format DV is also in a CCIR-601 aspect ratio (720 480) format Thus, the host will need to resize the nonsquare DV pixels into square aspect ratio pixels (640 480)
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