[FFmpeg-trac] #5117(undetermined:new): Seeking performance regression

[FFmpeg]

#5117: Seeking performance regression
-------------------------------------+-------------------------------------
               Reporter:  cehoyos    |                  Owner:
                   Type:  defect     |                 Status:  new
               Priority:  important  |              Component:
                Version:  git-       |  undetermined
  master                             |               Keywords:  aac seek
             Blocked By:             |  regression
Reproduced by developer:  0          |               Blocking:
                                     |  Analyzed by developer:  0
-------------------------------------+-------------------------------------
 http://thread.gmane.org/gmane.comp.video.ffmpeg.user/60315
 Seeking in a very large aac file with FFplay (and MPlayer) takes longer
 since 7f5af80ba42bbd82da53dfd95236e9d47159a96a
 {{{
 $ ffmpeg -f lavfi -i "sine=frequency=800:duration=7200" -c:a aac -b:a 320k
 test.aac
 }}}
 Trying to seek in this file with Page-Up takes significantly longer than
 before.
 {{{
 $ ffplay test.aac
 ffplay version N-77567-g29e6606 Copyright (c) 2003-2015 the FFmpeg
 developers
   built with gcc 4.7 (SUSE Linux)
   configuration: --enable-gpl
   libavutil      55. 11.100 / 55. 11.100
   libavcodec     57. 20.100 / 57. 20.100
   libavformat    57. 21.100 / 57. 21.100
   libavdevice    57.  0.100 / 57.  0.100
   libavfilter     6. 22.100 /  6. 22.100
   libswscale      4.  0.100 /  4.  0.100
   libswresample   2.  0.101 /  2.  0.101
   libpostproc    54.  0.100 / 54.  0.100
 [aac @ 0x7ff9b0000920] Estimating duration from bitrate, this may be
 inaccurate
 Input #0, aac, from 'test.aac':
   Duration: 02:04:19.00, bitrate: 144 kb/s
     Stream #0:0: Audio: aac (LC), 44100 Hz, mono, fltp, 144 kb/s
  761.17 M-A:  0.000 fd=   0 aq=   13KB vq=    0KB sq=    0B f=0/0
 }}}
 In addition, the seek is very imprecise, I quit immediately after the seek
 that should have been to 600 seconds.
 The performance regression is also reproducible with FFmpeg:
 {{{
 $ time ./ffmpeg -ss 1:45:00 -i test.aac -f null -
 ffmpeg version N-76321-g856b19d Copyright (c) 2000-2015 the FFmpeg
 developers
   built with gcc 4.7 (SUSE Linux)
   configuration:
   libavutil      55.  4.100 / 55.  4.100
   libavcodec     57. 11.100 / 57. 11.100
   libavformat    57. 11.100 / 57. 11.100
   libavdevice    57.  0.100 / 57.  0.100
   libavfilter     6. 14.100 /  6. 14.100
   libswscale      4.  0.100 /  4.  0.100
   libswresample   2.  0.100 /  2.  0.100
 [aac @ 0x23ec3e0] Estimating duration from bitrate, this may be inaccurate
 Input #0, aac, from 'test.aac':
   Duration: 02:04:19.00, bitrate: 144 kb/s
     Stream #0:0: Audio: aac (LC), 44100 Hz, mono, fltp, 150 kb/s
 Output #0, null, to 'pipe:':
   Metadata:
     encoder         : Lavf57.11.100
     Stream #0:0: Audio: pcm_s16le, 44100 Hz, mono, s16, 705 kb/s
     Metadata:
       encoder         : Lavc57.11.100 pcm_s16le
 Stream mapping:
   Stream #0:0 -> #0:0 (aac (native) -> pcm_s16le (native))
 Press [q] to stop, [?] for help
 size=N/A time=00:15:00.04 bitrate=N/A
 video:0kB audio:77523kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: unknown

 real    0m1.242s
 user    0m1.219s
 sys     0m0.022s
 }}}
 {{{
 $ time ./ffmpeg -ss 1:45:00 -i test.aac -f null -
 ffmpeg version N-76323-g7f5af80 Copyright (c) 2000-2015 the FFmpeg
 developers
   built with gcc 4.7 (SUSE Linux)
   configuration:
   libavutil      55.  4.100 / 55.  4.100
   libavcodec     57. 12.100 / 57. 12.100
   libavformat    57. 11.100 / 57. 11.100
   libavdevice    57.  0.100 / 57.  0.100
   libavfilter     6. 14.100 /  6. 14.100
   libswscale      4.  0.100 /  4.  0.100
   libswresample   2.  0.100 /  2.  0.100
 [aac @ 0x24993e0] Estimating duration from bitrate, this may be inaccurate
 Input #0, aac, from 'test.aac':
   Duration: 02:04:19.00, bitrate: 144 kb/s
     Stream #0:0: Audio: aac (LC), 44100 Hz, mono, fltp, 4 kb/s
 Output #0, null, to 'pipe:':
   Metadata:
     encoder         : Lavf57.11.100
     Stream #0:0: Audio: pcm_s16le, 44100 Hz, mono, s16, 705 kb/s
     Metadata:
       encoder         : Lavc57.12.100 pcm_s16le
 Stream mapping:
   Stream #0:0 -> #0:0 (aac (native) -> pcm_s16le (native))
 Press [q] to stop, [?] for help
 size=N/A time=00:15:00.04 bitrate=N/A
 video:0kB audio:77523kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: unknown

 real    0m1.361s
 user    0m1.339s
 sys     0m0.022s
 }}}

--
Ticket URL: <https://trac.ffmpeg.org/ticket/5117>
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