[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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