deinterlace: Better alternate support

Improve TFF/BFF autodetection according to first frame after a segment, instead of letting it continuously switch between TFF and BFF. Results in smoother transitions. Also handle the buffer state the same as mixed.

This is kind of related to #838 (CC @bilboed ). Fixing that is probably part of doing it right here. And that probably needs someone to reverse-engineer what these GST_DEINTERLACE_BUFFER_STATE actually mean (and document it!).

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• 682342e7 - deinterlace: Fix telecine/onefield mixup

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• e7e598f9 - deinterlace: Provide documentation for GST_DEINTERLACE_BUFFER_STATE

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resolved all threads

marked this merge request as ready

added 3 commits

• 1f1404ee - deinterlace: Better alternate support
• bb85cadd - deinterlace: Fix telecine/onefield mixup
• 377b34ba - deinterlace: Provide documentation for GST_DEINTERLACE_BUFFER_STATE

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added 3 commits

• 43c5cc49 - deinterlace: Better alternate support
• e8a73b6c - deinterlace: Fix telecine/onefield mixup
• 200ca892 - deinterlace: Provide documentation for GST_DEINTERLACE_BUFFER_STATE

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Still getting combs in this test case: gst-launch-1.0 videotestsrc pattern=ball ! video/x-raw,interlace-mode=progressive ! queue ! interlace field-pattern=0 top-field-first=true ! video/x-raw\(format:Interlaced\),interlace-mode=alternate ! queue ! deinterlace ! queue ! autovideosink

but not with interlace top-field-first=false, and also not with two test files that I have (one TFF which I can't make public, and one in https://trac.ffmpeg.org/ticket/5514)

mentioned in merge request gst-plugins-bad!1996 (merged)

added 5 commits

• 200ca892...5f00810e - 2 commits from branch gstreamer:master
• 132390c0 - deinterlace: Better alternate support
• 78049963 - deinterlace: Fix telecine/onefield mixup
• e786c973 - deinterlace: Provide documentation for GST_DEINTERLACE_BUFFER_STATE

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resolved all threads

resolved all threads

added 3 commits

• 77a0ac97 - deinterlace: Better alternate support
• 873e7aab - deinterlace: Fix telecine/onefield mixup
• c26ed317 - deinterlace: Provide documentation for GST_DEINTERLACE_BUFFER_STATE

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LGTM! 👍

approved this merge request

assigned to @gstreamer-merge-bot