[FFmpeg-trac] #2454(avcodec:new): h264 frame-mt performance regression
FFmpeg
trac at avcodec.org
Tue Apr 9 22:38:27 CEST 2013
#2454: h264 frame-mt performance regression
--------------------------------------+---------------------------------
Reporter: heleppkes | Owner:
Type: defect | Status: new
Priority: normal | Component: avcodec
Version: git-master | Keywords: h264
Blocked By: | Blocking:
Reproduced by developer: 0 | Analyzed by developer: 0
--------------------------------------+---------------------------------
Summary of the bug:
The performance of the H264 decoder in frame multi-threading mode on
certain interlaced files has gone down significantly since
644092c8e8892f4f7e44a01b83487b398cafeb5a.
Latest git-head produces ~40 fps on my box, reverting the mentioned commit
brings me back to ~55 fps.
With git-head:
{{{
% ffmpeg -i
E:\Downloads\Taylor.Swift.BRIT.Awards.2013.1080i50.H264.422.44Mbps.ts -f
null -
ffmpeg version N-51697-g1043cb8 Copyright (c) 2000-2013 the FFmpeg
developers
built on Apr 9 2013 22:28:47 with gcc 4.7.2 (GCC)
configuration: --enable-gpl
libavutil 52. 25.100 / 52. 25.100
libavcodec 55. 2.100 / 55. 2.100
libavformat 55. 1.100 / 55. 1.100
libavdevice 55. 0.100 / 55. 0.100
libavfilter 3. 49.101 / 3. 49.101
libswscale 2. 2.100 / 2. 2.100
libswresample 0. 17.102 / 0. 17.102
libpostproc 52. 2.100 / 52. 2.100
Input #0, mpegts, from
'E:\Downloads\Taylor.Swift.BRIT.Awards.2013.1080i50.H264.422.44Mbps.ts':
Duration: 00:00:17.13, start: 27251.076611, bitrate: 43898 kb/s
Program 1
Stream #0:0[0x134]: Video: h264 (High 4:2:2) ([27][0][0][0] / 0x001B),
yuv422p, 1920x1080 [SAR 1:1 DAR 16:9], 25 fps
, 50 tbr, 90k tbn, 50 tbc
Stream #0:1[0x100](eng): Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz,
stereo, s16p, 256 kb/s
Output #0, null, to 'pipe:':
Metadata:
encoder : Lavf55.1.100
Stream #0:0: Video: rawvideo (Y42B / 0x42323459), yuv422p, 1920x1080
[SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 90k tbn,
25 tbc
Stream #0:1(eng): Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
Stream mapping:
Stream #0:0 -> #0:0 (h264 -> rawvideo)
Stream #0:1 -> #0:1 (mp2 -> pcm_s16le)
Press [q] to stop, [?] for help
[null @ 05E589C0] Encoder did not produce proper pts, making some up.
PES packet size mismatch0 size=N/A time=00:00:16.68 bitrate=N/A dup=12
drop=0
[mp2 @ 032B84C0] incomplete frame
Error while decoding stream #0:1: Invalid data found when processing input
[h264 @ 05D1B5A0] error while decoding MB 100 8, bytestream (td)
frame= 425 fps= 39 q=0.0 Lsize=N/A time=00:00:17.00 bitrate=N/A dup=12
drop=0
video:27kB audio:3096kB subtitle:0 global headers:0kB muxing overhead
-100.000688%
}}}
And with 644092c reverted, just the relevant line for breviety:
{{{
frame= 425 fps= 54 q=0.0 Lsize=N/A time=00:00:17.00 bitrate=N/A dup=12
drop=0
}}}
A change from 39 to 54 fps in this run.
The sample used in this test can be found here:
http://files.1f0.de/samples/Taylor.Swift.BRIT.Awards.2013.1080i50.H264.422.44Mbps.ts
--
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2454>
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