[Webkit-unassigned] [Bug 259987] New: H.264 baseline profile is selected but iPhone sends H.264 high profile in the video stream.

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Wed Aug 9 12:00:30 PDT 2023


https://bugs.webkit.org/show_bug.cgi?id=259987

            Bug ID: 259987
           Summary: H.264 baseline profile is selected but iPhone sends
                    H.264 high profile in the video stream.
           Product: WebKit
           Version: Safari 15
          Hardware: iPhone / iPad
                OS: iOS 15
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebRTC
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jbookshar at compunetix.com
                CC: youennf at gmail.com

In our SDP logs we see the following.

SDP Offer from iPhone

a=fmtp:96 level-asymmetry-allowed=1;packetization-mode=1;profile-level-id=640c1f
a=fmtp:98 level-asymmetry-allowed=1;packetization-mode=1;profile-level-id=42e01f
a=fmtp:100 level-asymmetry-allowed=1;packetization-mode=0;profile-level-id=640c1f
a=fmtp:102 level-asymmetry-allowed=1;packetization-mode=0;profile-level-id=42e01f


SDP Answer to iPhone

a=fmtp:102 profile-level-id=42e028;packetization-mode=1


Then our decoder reports that even though baseline profile is selected, we are receiving high profile in the video stream.

WARN  2023-08-09T17:15:20.067Z From: 0x01020101 0x00000031 DEFAULT 1000463: H264Decoder_Cl::parseSPSProfileIdc: profile High profile (100) not supported

I believe we have reported this in the past and a patch to iOS 14 resolved it.

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