Bus Mastering

Bus Mastering

Improving VFW

The Features

Summary

Sample PIC's



TECHNICAL INFO


A full frame is based on:

640 x 480 (NTSC) = 307,200 active pixels
576 x 768 (PAL) = 442,368 active pixels
Each pixel is coded in 4:2:2 YUV, encoded with 8-bits for Y and 4 pixels each for U and V = 16 bit = 2 bytes.

This results in the following data rates:

NTSC: 307,200 x 2 = 614,400 byte = 600 KB/frame, or 17.6 MB/s at 30 fps
PAL: 442.368 x 2 = 884,736 bytes = 864 KB/frame, or 21.1 MB/s at 25 fps
A 1 Gig drive (1024*1024*1024 byte) can hold about 58 seconds of uncompressed NTSC or 49 seconds of uncompressed PAL video.

Compression Rate

1 GB

4 GB

8 GB

PAL

NTSC

PAL

NTSC

PAL

NTSC

1:1

49"

58"

3'14"

3'53"

6'28"

7'46"

4: 1

3'14"

3'53"

12'56"

15'32"

25'53"

31'04"

5: 1

4'02"

4'51"

16'11"

19'25"

32'22"

38'50"

8: 1

6'28"

7'46"

25'53"

31'04"

51'47"

1h 02'08"

10: 1

8'05"

9'42"

32'21"

38'50"

1h 04'44"

1h 17'40"

15: 1

12'08"

14'34"

48'33"

58'15"

1h 37'06"

1h 56'30"

20: 1

16'10"

19'25"

1h 04'44"

1h 17'40"

2h 09'

2h 35'

50: 1

40'27"

48'33"

2h 42'

3h 14'

5h 24'

6h 28'

100: 1

1h 20'54"

1h 37'05"

5h 24'

6h 28'

10h 47'

12h 56'

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