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In some cases, your system may return an error indicating ati video codec 2 vcr2. There can be many reasons for this problem.

• FourCC: VCR2
• Company: ATI
• Examples: http://samples.mplayerhq.hu/V-codecs/ATI-VCR12/

General Description Of VCR2

ATI is essentially an important subset of MPEG-2 video. ATI video capture cards use this format. The material is compressed precisely. There is a Win9x driver specially designed to play ATI VCR2 videos without hardware.

VCR2 Videos

VCR2 only uses internal frames. The data for each picture consists of straight sections: an optional sequence header, an optional sequence header extension, an optional GOP (group of pictures) image header, an image header, a header extension, a slice layer, and a macroblock layer with the current image data.

To find out which header is often next when the bitstream searches for the boot system. The following start codes are likely to be defined:

1. SEQ_HEAD_START_CODE 0x000001B3
2. EXTENSION_START_CODE 0x000001B5
3. GOP_START_CODE 0x000001B8
4. PIC_START_CODE 0x00000100

This element is optional. Its presence is classified as SEQ_HEAD_START_CODE. USIt actually has the following format:

• Horizontal size (12 bits)

• Vertical number (12 bits)

• Pixel format (4 bits)

• Frame risk (4 bit rate)

frame. The specific value is ignored in the decoder. Check the current frame rate of the AVI container.

• Frame rate (18 bit)

The bit rate associated with bitstream units of four bits per second, rounded to the next digit.

• Marking bit (1 bit)

• 10-bit Video Buffering Check Buffer (VBV) Aspect

• Limited parameter indicator bit)

• Loading (1-bit internal quantizer matrix indicator)

• Load (1 matrix flag not intraquantizer (1 bit)

This extension is optional. Its presence is indicated by EXTENSION_START_CODE and the format type = file (see 1 below). It has the following format like:

• Expansion (4 bits)

set = 1 to expand the row header. It is dispatched immediately with EXTENSION_START_CODE.

• Transition profile / level (1 it)

• Profile (3 bit)

• Level (4 bits)

• Progressive Sequence Indicator Bit)

• Chroma (format code 1 (2 bits)

• Increase amount horizontally (2 bits)

increases the size specified in the sequence header. This means that the width of the encoded image is (Horiz_size_ext << 12) | (horizon_size).

• Vertical offset size (2 bits)

increases the oversized size in the sequence header. So the height of the encoding situation is (vert_size_ext = << 12) | (size_vert).

• Richter Bit Expansion (12 bits)

• Marker (1 pin bit)

• Increase VBV buffer size (8 bits)

• Idle indicator low (1 bit)

• Frame rate out of frame count (2 bits)
• Frame rate increase denominator (5 bit)

This heading is optional. This counts as the presence indicated by GOP_START_CODE. It has the following format:

• Time (25 bit exchange)

contains: skip frame indicator(1 bit), significant time (5 bits), minutes (6 bits), cannon bit (must be 1), seconds (6 bits), frames (6 bits). …

• Closed group flag (1 bit)

• link pin bit)

This header (1 must be present in the VCR2 video stream. It is preceded by PIC_START_CODE. It creates the following format:

• Time reference (10 bits)

• Frame selection (3 bits)

• VBV latency (16 bit)

• Extra-Moment-Bild-Flag (1 bit)

This offspring must be present in the vcr2 video stream. This is primarily EXTENSION_START_CODE. Has an observation format:

• Extension type (4 bits)

• Front Horizontal (4-bit)

• Transfer Directory (4 bits)

• Horizontal backward (4 bits)

• Return up and down (4 bits)

• Detailed (2-bit) Intra DC

• Image structure (2 bits)

• First field flag number one (1 bit)

• frame_pred_frame_dct flag (1 bit)

• Masking motion vector indicator (1 bit)

• q_scale art flag (1 bit)

• Code in intra-vlc format (1 b т)

• Alternate scan flag (1 bit)

• Repeat to start field indicator (1 bit)

• Chroma 420 assortment indicator (1 bit)

• Progressive flag frame (1 bit)

• Flag for composite display (1 bit)

Layer Level

The layer layer must be present in the VCR2 video stream. It has the following format:

• Fragment start promo code (32 bits)

the first 24 have components with a value of 0x000001. The last 8 bits indicate a large number of slices in the range 0x01 – 0xAF.

• Quantization scale bits)

a (5 unsigned integers used to scale the healing level of DCT coefficients. Two are prohibited.

• Extra bit chunk (1 green bit)

Macroblock Level

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The macroblock layer must be present in the VCR2 video water. It contains data for most of the macroblocks in the current slice. It has the following format:

Charles Pye

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