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[Friedrich <question230218@xxxxxxxxxxxxxxxxxxxxx>]

Question #230218 on rohc changed:
https://answers.launchpad.net/rohc/+question/230218

Description changed to:
Hi Didier,

I have two questions about the compressed header sizes obtained from
V1.5.1 and V1.3.1.

1)
In my running of V1.5.1, the first four packets are at IR state, then the compressed header size of the rest packets keeps constant at 3 bytes. But in the running of V1.3.1 with the same setup, only the first THREE packets are at IR state. Do you know the reason why V1.5.1 needs one more IR header packet than V1.3.1 does?

V1.5.1: (timestamp_msec:size_bytes)   1263:38 1283:40 1303:40 1323:40 1343:3 1363:3 1383:3
V1.3.1: (timestamp_msec:size_bytes)   1263:38 1283:40 1303:40 1323:3 1343:3 1363:3 1383:3
(note: RTP packets are sent every 20ms in a talkspurt.)

Logs:
V1.5.1: http://pastebin.com/m53vp9Q4
V1.3.1: http://pastebin.com/2He9pUmy

2)
Also under the same setup, the packets at the following timestamps perform different between V1.5.1 and V1.3.1. V1.5.1 has larger compressed header sizes. Does it result from any codes updates?  

V1.5.1: (timestamp_msec:size_bytes)   1463:12 1623:13 1783:13 1883:12 1903:12 1923:12 1943:12
V1.3.1: (timestamp_msec:size_bytes)   1463:4   1623:4   1783:4  1883:4   1903:3   1923:3   1943:3
(note: RTP packets are sent every 20ms in a talkspurt.)

Logs:
V1.5.1: http://pastebin.com/m53vp9Q4
V1.3.1: http://pastebin.com/2He9pUmy

Thanks!

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