[3.0] SPS extensions handling/writing backport

(cherry picked from commit 8d5dd5ea)

added Version::3.0.x label

assigned to @fcartegnie

changed title from SPS extensions handling/writing backport to [3.0] SPS extensions handling/writing backport

changed milestone to %3.0.x maintenance

added MRStatus::Acceptable label

added MRStatus::Accepted label and removed MRStatus::Acceptable label

MR Acceptance result

This MergeRequest has been Accepted! Congratulations.

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• MR should be considered mergeable by Gitlab
• Last pipeline should be successful
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• All threads should be resolved, and score >= 0
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added 7 commits

• b12d9c9a...4c537f29 - 2 commits from branch videolan:3.0.x
• ff632589 - packetizer: h264: write avcC with HIGH extended info
• 7f85a5ad - packetizer: h264: add basic decoding for sequence set extension
• 8530682d - hxxx_helper: process SPS_EXT
• a3df90aa - packetizer: h264: remove scan lookup
• cd18bd16 - packetizer: h264: gather and store SPSEXT

Compare with previous version

enabled an automatic merge when the pipeline for cd18bd16 succeeds

merged

changed milestone to %3.0.17

added Component::Packetizers label