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[Didier Barvaux <question269935@xxxxxxxxxxxxxxxxxxxxx>]

Question #269935 on rohc changed:
https://answers.launchpad.net/rohc/+question/269935

    Status: Open => Answered

Didier Barvaux proposed the following answer:
Hello,

> It seems to be working but I got header compression to 1 Byte
> from 40 byte.Is this correct ? can we achieve compression to
> this minimal size ?.If yes , its great .Please confirm

Yes, 1-byte ROHC header is the minimal size you can get from the ROHC
library. Link-assisted profiles defined in IETF RFC 4362 [1] may reduce
it further to 0 byte, but they are not implemented in the ROHC library.

Please note that your increases the RTP TS by the length of data you
send in the RTP packet. In real-world, the RTP TS shall be the time at
which the data sampling. See the description of the timestamp field in
§5.1 page 14 and 15 of IETF RFC3550 [2]. If you use a monotonic clock
and your sampling rate is constant, it should result in a linear
increase of the RTP TS value which will be efficiently compressed by
ROHC.

Regards,
Didier

[1] http://tools.ietf.org/html/rfc4362
[2] http://tools.ietf.org/html/rfc3550#section-5.1

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