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The matroska codec specs is unfortunately vague on the subject, stating for H264: AVC/H.264 stored as described in [@!ISO.14496-15] and for H265: HEVC/H.265 stored as described in [@!ISO.14496-15] This spec however specifies multiple stream formats, our implementation has opted for interpreting this as avc1 / hvc1, both of which disallow in-band SPS. Most decoders however will support in-band SPS / PPS, and this commit gives the option to explicitly mux in avc3 / hev1, which allows changing stream parameters on the fly, that is useful for smart encoding for example. When either of these stream formats are picked as the input, changes in codec_data / tier / level / profile do not cause renegotiation failure, a warning is logged however as it isn't clear how compliant such a stream is. The stream-format field is correctly ordered in the template caps to avoid selecting potentially non-compliant options on automatic negotiation. Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/-/merge_requests/1047> |
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