HD Player
Appendix D: Specifications
101
Rev. 6.4
Appendix C:
Encoding Guidelines
The following notes present encoding details required for the MediaSonic High Definition Player.
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MPEG files must be encoded as a Transport Stream.
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Elementary Video stream must be Main Profile High Level
MP@HL
4:2:0.
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Elementary Audio Stream must be AC3 encoded.
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Transport stream packet size is 188bytes. This is the standard size, although some encoders generate
packets of 204 bytes. The extra data contains error detection information, used for satellite transmission.
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Stream must start with an I frame and finish on a 188 bytes packet boundary.
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The two most popular resolutions supported are 1920 x 1080 x 59.94 interlace and 1280 x 720 x 59.94
progressive.
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Recommended Video PID numbers are 17, 33 & 49. Audio PID numbers are video PID + 3. Try to ensure
that all files are encoded with the same PID. MediaSonic normally use 49.
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The standard ATSC bit rate is 19.39Mb/s. Higher bit rates up to 50Mb/s can be accommodated.25Mb/s is
an excellent compromise between image quality and file size (storage).
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It is preferable to use closed Group of Pictures (GOPs) if this option is available with the encoder. The
preferred, though not required, GOP size is 15 frames. This provides a good compromise between
compression and random access in the stream.
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A GOP pattern containing I, B & P frames will provide the most efficient compression.
I B B P B B P… generally produces good results.
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Each GOP should contain a sequence header.
