From: Niklas Haas <ffmpeg@haasn.xyz>
To: ffmpeg-devel@ffmpeg.org
Subject: [FFmpeg-devel] [PATCH 0/8] DoVi metadata compression
Date: Tue, 18 Jun 2024 21:35:30 +0200
Message-ID: <20240618194221.26073-1-ffmpeg@haasn.xyz> (raw)
Moves metadata compression out of the codecs and into a bitstream
filter. This is required by design, because keyframes must have
compression disabled (for obvious reasons). Therefore, we _must_
generate the dolby vision RPUs after encoding.
The downside of this approach is that it requires "redundantly" encoding
+ decoding RPUs in between the codec and the bsf. However, the tradeoff
is that it allows us to also strip/modify DV metadata when not
transcoding (-c:v copy). Such a feature has a legitimate use case, as it
allows enabling/disabling Dolby Vision compression on existing streams
(to e.g. minimize size, or to maximize compatibility).
If we wanted to avoid this overhead, we could hypothetically introduce
a new packet side data type for dolby vision metadata, and have the
codec merely copy the frame side data to the packet. But I am somewhat
unwilling to add yet more packet side data types that are aliases of
frame side data types, and I don't think the overhead is significant.
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next reply other threads:[~2024-06-18 19:42 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-06-18 19:35 Niklas Haas [this message]
2024-06-18 19:35 ` [FFmpeg-devel] [PATCH 1/8] avcodec/dovi_rpudec: clarify semantics Niklas Haas
2024-06-18 19:35 ` [FFmpeg-devel] [PATCH 2/8] avcodec/dovi_rpuenc: also copy ext blocks to dovi ctx Niklas Haas
2024-06-18 19:35 ` [FFmpeg-devel] [PATCH 3/8] avcodec/dovi_rpuenc: try to re-use existing vdr_rpu_id Niklas Haas
2024-06-18 19:50 ` Niklas Haas
2024-06-18 19:35 ` [FFmpeg-devel] [PATCH 4/8] avcodec/dovi_rpuenc: add `flags` to ff_dovi_rpu_generate() Niklas Haas
2024-06-18 19:35 ` [FFmpeg-devel] [PATCH 5/8] avcodec/dovi_rpuenc: make encapsulation optional Niklas Haas
2024-06-18 19:35 ` [FFmpeg-devel] [PATCH 6/8] avcodec/dovi_rpuenc: disable metadata compression by default Niklas Haas
2024-06-18 19:35 ` [FFmpeg-devel] [PATCH 7/8] avcodec/dovi_rpu: add ff_dovi_get_metadata() Niklas Haas
2024-06-18 19:35 ` [FFmpeg-devel] [PATCH 8/8] avcodec/bsf/dovi_rpu: add new bitstream filter Niklas Haas
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