Mermaid Technology 190 ,

mermaid ActiveMedia Users Manual ver 2.0

Appendix F: Supported file types

• JPEG and EXIF 2.2 format upto 19 megapixel

• For best performance – use file resolution at 640 x 480 pixels

• MPEG-1 and MPEG-2 video Playback

• Motion JPEG file playback

1. Files must consist of a Program-stream including 1 video-track and 1 stereo audio-track

2. Files must not be Elementary-stream or Transport-stream.

3. Recommended file extension is .mpg

4. Use 4:2:0 sampling

5. File resoluton must be 720x480, 60 fields (30 frames) NTSC (VGA 640x480 60 Hz ) or

720x576, 50 fields (25 frames) PAL (VGA 800x600 50Hz) - Recommended

6. It is recommende to use Closed GOB including one I-frame at least each 15th frame. VBV

buffer (Video Buffer) should be 224.

7. Both fields must be encoded (Automatic procedure)

8. It is recommeded to use Constant videobitrate larger then 4 Mbit/s, to avoid motion

artifacts. In comparation, DVD’s are typically encoded at 5-6 Mbit/s and satellite TV at 7-8

Mbit/s. In order to achieve optimum picture quality, please encode at 6-8 Mbit/s.

9. Recommended Audio bitrate is 384 kbit/s. Sample rate 48 khz. Recommende sound level I

0 db by means of standard test tone. Max peak should be +6 db.

10. To produce MPEG2 files, it is recommende to use software, with possibility to configure a

standard template, to be used each time a “unknown” content is received. This will ensure

that the output files always are encoded and produced according the the above stated “rules”

E.g. the program “Procoder2” from “Canopus” will suit the common needs.

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Mermaid Technology 190 user manual ,