[Webkit-unassigned] [Bug 226776] New: Colorimetry-related warnings with H264 encoded with iOS Safari

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=226776

            Bug ID: 226776
           Summary: Colorimetry-related warnings with H264 encoded with
                    iOS Safari
           Product: WebKit
           Version: Safari 14
          Hardware: iPhone / iPad
                OS: iOS 14
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebRTC
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: nazar at mokrynskyi.com
                CC: youennf at gmail.com

When encoding H264 on iOS, its contents doesn't seem to contain colorimetry information when decoded by GStreamer, resulting in following warnings:
> 2:59:30.649107764     1 0x7f0298049400 WARN              video-info video-info.c:204:validate_colorimetry: Need to specify a color matrix when using YUV format (I420)
> 2:59:30.649125302     1 0x7f0298049400 WARN              video-info video-info.c:520:gst_video_info_from_caps: invalid colorimetry, using default

Those warnings are not present when VP8 is used, not present with desktop Safari and H264 (which makes me think it is related to hardware-accelerated encoder) and not present with Firefox/Chromium.

Those are annoying warnings and would be nice to fix in iOS version of Safari.

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