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Re: [AVT] RFC3984bis - profile & level in offer/answer
To: &&, &&
Subject: Re: [AVT] RFC3984bis - profile & level in offer/answer
From: &Roni Even& &&
Date: Wed, 10 Sep :25 +0300
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My preference is to mandate profile match and level can be downgraded based
on the hierarchy.
I assume that 1b should be in the hierarchy between level 1 and 1.1
As for the flags my view is that they should be matched.
I think that H.264 compliance point is based on defined profiles. And the
levels gives hierarchy inside a specific profile.
I think that will make it simple enough. Note that there are more H264
parameters defined and offer enough challenge.
-----Original Message-----
From: avt-bounces at ietf.org [ at ietf.org] On Behalf Of
Ye-Kui.Wang
Sent: Wednesday, September 10,
To: avt at ietf.org
Subject: [AVT] RFC3984bis - profile & level in offer/answer
I feel that this issue should be publicly discussed.
The media type parameter profile-level-id includes three bytes,
profile_idc (8 bits), some flags and reserved bits (8 bits), and
level_idc (8 bits). It has been discussed that level 1b is signaled in
an ad-hoc manner, such that a lower value of level_idc does not always
mean a lower level. Actually, there is also an issue for profile, which
has not been mentioned as far as I know.
For example, a bitstream with profile_idc=66 (Baseline profile) and
constraint_set1_flag (the second bit of the middle byte)=1 can also be
marked with profile_idc=77 (Main profile) and constraint_set0_flag (the
first flag)=1, and a Baseline profile decoder of a particular level can
decode any bitstream with constraint_set0_flag=1 with a level not higher
than the particular level. This means the following in SDP offer/answer:
- If the direction attribute is sendrecv, two different profile-level-id
values 42401E and 4D801E in the offer and the answer should be
considered equivalent. In this case, if other symmetric parameters
match, the offer/answer should be considered matched. Just to be more
complicated (but accurate :-), the second byte in the first value 42401E
can be replaced with any value with the second bit
(constraint_set1_flag) equal to 1, and the second byte in the second
value 4D801E can be replaced with any value with the first bit
(constraint_set0_flag) equal to 1, and the offer/answer are still
- If the offer has direction attribute sendonly and
profile-level-id=42XX1E (XX is any value in the range of 00-FF,
inclusive), and the answer has direction attribute recvonly and
profile-level-id=YYZZ1E (YY is any value in the range of 00-FF,
inclusive, and ZZ is any value with the first bit equal to 1), then the
offer/answer should be considered matched.
And there are many other different combinations of profiles and
constraint flags to be considered to make the list complete. RFC 3984
considers all these cases as un-matched.
So, opinion requested: should this issue be addressed in the bis draft?
_______________________________________________
Audio/Video Transport Working Group
avt at ietf.org
_______________________________________________
Audio/Video Transport Working Group
avt at ietf.org
Follow-Ups:
From: Ye-Kui.Wang
References:
From: Ye-Kui.Wang
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