Evido EAD-B1000 Manual de usuario descargar pdf (Pagina 23)

Digital Broadcaster User Manual v. 3.4 rev. 3421 17 July 24, 2008

• Resolution: 720 X 480 NTSC

• Frame rate: 29.97 frames/second

• Aspect ratio: 4:3

• Chroma format: 4:2:0

• Structure: Closed GOP (Group of Pictures) with one I-frame and four P-frames every

15 frames, using the pattern IBBPBBPBBPBBPBB

• Pack size of 2048 bytes

• Field Encoding Order: bottom field first (BFF)

• Interlaced video (deinterlaced video for web media)

• Audio bit rate of 192 kbps, 224 kbps, 256 kbps, 384 kbps

• Audio sampling rate of 48 kHz or 44.1 kHz

• Audio sampling rate of 1152

• Audio mode: stereo

• Audio codec: MPEG-1 Layer II, Stereo AC-3, AC-3 5.1, or Linear PCM (LPCM)

depending on your server output type. See the chart on page 16.

• Program stream files should terminate with an end code (00 00 01 b9).

• Maximum program mux rate of 10.08 Mbps for standard-definition interlaced video.

The mux rate is the sum of the video bitrate, the audio bitrate, and the overhead

required by your encoder. You can use the formula M = V + A + O(V + A).

For example, if your encoder requires 10% overhead, you could encode at the

maximum audio bitrate of 384 kbps and be able to encode at a video bitrate up to

8.779 Mbps. (10.08 Mbps = V + 384 kbps + .10[V + 384 kbps] Solve for V to get

8.7796363 Mbps.)

If your encoder requires 25% overhead and you encode at the maximum audio bitrate

of 384 kbps, you would be able to encode at a video bitrate up to 7.68 Mbps. (10.08

Mbps = V + 384 kbps + .25[V + 384 kbps] Solve for V to get 7.68 Mbps.)

• Recommended bit rates for various types of video content are as follows:

o 4 Mbps for good quality video with low motion

o 6 Mbps for good quality with average motion

o 8 Mbps for good quality with high motion and

o 9 Mbps for high quality with high motion content.

• Video sequence header before every GOP to facilitate random access (stop & start

anywhere in file) needed for virtual trims and continuity resume. Files from a DVD

will have the video sequence header (vsh).

• Transport streams should include Random Access Indicators for random access

support.

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Evido EAD-B1000 Manual de usuario Pagina 23