From: Anton Khirnov <anton@khirnov.net>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Subject: Re: [FFmpeg-devel] [PATCH v3] ffmpeg CLI multithreading
Date: Wed, 06 Dec 2023 20:36:09 +0100
Message-ID: <170189136997.1197.12625006990874818639@lain.khirnov.net> (raw)
In-Reply-To: <9a6f5c0-35b8-b424-1fc-591ecd618e73@passwd.hu>
Quoting Marton Balint (2023-12-06 20:29:01)
>
>
> On Wed, 6 Dec 2023, Anton Khirnov wrote:
>
> > Hi,
> > this should hopefully be the last version of this set. If nobody has new
> > comments, I will push it in a few days.
>
> In some cases the performance penalty because of threading is quite
> significant:
>
> Example command line:
>
> ffmpeg -f lavfi -i sine -af volume=6dB -f null none
>
> After latest threading changes: speed=810x
> Before latest threading changes: speed=1.13e+03x
> With 6.0 branch: speed=1.43e+03x
> With 5.1 branch: speed=2.92e+03x
>
> This is a significant decline from 5.1, getting slower with each
> release... Is there anything that can be done about this?
Would guess this is caused by overhead from tons of tiny frames. So
1) generate larger frames
2) use -filter_complex with no inputs instead of -f lavfi to eliminate
all overhead from demuxing, decoding, and demux-decode/decode-filter
inter-thread communication
--
Anton Khirnov
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next prev parent reply other threads:[~2023-12-06 19:36 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-12-06 10:27 Anton Khirnov
2023-12-06 10:27 ` [FFmpeg-devel] [PATCH 01/10] fftools/ffmpeg_filter: make sub2video heartbeat more robust Anton Khirnov
2023-12-06 10:27 ` [FFmpeg-devel] [PATCH 02/10] fftools/ffmpeg_filter: move filtering to a separate thread Anton Khirnov
2023-12-06 10:27 ` [FFmpeg-devel] [PATCH 03/10] fftools/ffmpeg_filter: buffer sub2video heartbeat frames like other frames Anton Khirnov
2023-12-06 10:27 ` [FFmpeg-devel] [PATCH 04/10] fftools/ffmpeg_filter: reindent Anton Khirnov
2023-12-06 10:27 ` [FFmpeg-devel] [PATCH 05/10] fftools/ffmpeg_mux: add muxing thread private data Anton Khirnov
2023-12-06 10:27 ` [FFmpeg-devel] [PATCH 06/10] fftools/ffmpeg_mux: move bitstream filtering to the muxer thread Anton Khirnov
2023-12-06 10:27 ` [FFmpeg-devel] [PATCH 07/10] fftools/ffmpeg_demux: switch from AVThreadMessageQueue to ThreadQueue Anton Khirnov
2023-12-06 10:27 ` [FFmpeg-devel] [PATCH 08/10] fftools/ffmpeg_enc: move encoding to a separate thread Anton Khirnov
2023-12-06 10:27 ` [FFmpeg-devel] [PATCH 09/10] fftools/ffmpeg: add thread-aware transcode scheduling infrastructure Anton Khirnov
2023-12-06 10:27 ` [FFmpeg-devel] [PATCH 10/10] fftools/ffmpeg: convert to a threaded architecture Anton Khirnov
2023-12-06 11:22 ` Paul B Mahol
2023-12-06 11:31 ` Anton Khirnov
2023-12-06 10:51 ` [FFmpeg-devel] [PATCH] web: add a news entry for ffmpeg CLI threading Anton Khirnov
2023-12-06 10:55 ` [FFmpeg-devel] [PATCH v3] ffmpeg CLI multithreading Nicolas George
2023-12-06 12:06 ` Zhao Zhili
2023-12-06 12:10 ` Nicolas George
2023-12-06 12:30 ` Anton Khirnov
2023-12-06 12:58 ` Nicolas George
2023-12-06 17:31 ` Anton Khirnov
2023-12-06 20:14 ` Nicolas George
2023-12-06 20:53 ` Vittorio Giovara
2023-12-06 19:29 ` Marton Balint
2023-12-06 19:36 ` Anton Khirnov [this message]
2023-12-06 20:16 ` Nicolas George
[not found] ` <6F5C6E5F-1538-47F0-9C71-CA10A1D38C3F@cosmin.at>
2023-12-06 20:29 ` Cosmin Stejerean via ffmpeg-devel
2023-12-06 21:00 ` Anton Khirnov
2023-12-06 20:29 ` Anton Khirnov
2023-12-06 20:03 ` Vittorio Giovara
2023-12-06 20:21 ` Michael Niedermayer
2023-12-07 10:52 ` Anton Khirnov
2023-12-07 18:10 ` Michael Niedermayer
2023-12-07 18:27 ` Michael Niedermayer
2023-12-11 9:06 ` Anton Khirnov
2024-01-15 23:51 ` Marth64
2024-01-24 12:51 ` Anton Khirnov
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