#7706: 20-30% perf drop in FFmpeg (H264) transcode performance with VAAPI
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Reporter: eero-t | Owner:
Type: defect | Status: new
Priority: normal | Component:
Version: git-master | undetermined
Keywords: vaapi | Resolution:
regression | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Comment (by eero-t):
Did manual bisect (they go from newer to older commits):
* slow: 2019-01-23 23-04-12 916b3b9079f783f0e00823e19bba85fa0f7d012f:
vaapi_encode_vp9: Support more complex reference structures
* slow: 2019-01-23 23-04-11 494bd8df782efe53e85de8ce258a079cea4eca72:
vaapi_encode: Let the reconstructed frame pool be sized dynamically
* slow: 2019-01-23 23-04-11 5fdcf85bbffe7451c227478fda62da5c0938f27d:
vaapi_encode: Convert to send/receive API
* fast: 2019-01-23 23-04-11 26ce3a43a35fe3a43c895945252aa22c6b46ffb7:
vaapi_encode: Allocate picture-private data in generic code
=> encode perf regression came from:
{{{
commit 5fdcf85bbffe7451c227478fda62da5c0938f27d
Author: Mark Thompson <[email protected]>
AuthorDate: Thu Dec 20 20:39:56 2018 +0000
Commit: Mark Thompson <[email protected]>
CommitDate: Wed Jan 23 23:04:11 2019 +0000
vaapi_encode: Convert to send/receive API
This attaches the logic of picking the mode of for the next picture to
the output, which simplifies some choices by removing the concept of
the picture for which input is not yet available. At the same time,
we allow more complex reference structures and track more reference
metadata (particularly the contents of the DPB) for use in the
codec-specific code.
It also adds flags to explicitly track the available features of the
different codecs. The new structure also allows open-GOP support, so
that is now available for codecs which can do it.
}}}
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Ticket URL: <https://trac.ffmpeg.org/ticket/7706#comment:2>
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