[FFmpeg-trac] #6723(avcodec:open): DTS-CD Decoding Distortion

FFmpeg trac at avcodec.org
Mon Oct 9 03:05:25 EEST 2017


#6723: DTS-CD Decoding Distortion
-------------------------------------+-------------------------------------
             Reporter:  nachtzug     |                    Owner:
                 Type:  defect       |                   Status:  open
             Priority:  important    |                Component:  avcodec
              Version:  git-master   |               Resolution:
             Keywords:  dca          |               Blocked By:
  regression                         |  Reproduced by developer:  1
             Blocking:               |
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
Changes (by cehoyos):

 * status:  new => open
 * reproduced:  0 => 1
 * component:  undetermined => avcodec
 * priority:  normal => important
 * version:  unspecified => git-master
 * keywords:   => dca regression


Comment:

 For future tickets: Please test current FFmpeg git head (nothing else is
 supported here), provide the command line you tested together with the
 complete, uncut console output and please cut your samples.

 Regression since a0349ae27c127df8c72de1c30dc4090360ec7ef4, a possibly
 related error - ''Read past end of core frame'' - was shown since ae5b2c52
 (the new dts decoder) but no distortions were audible.
 {{{
 $ ffmpeg -i Engelsstaub\ -\ Anderswelt.dts.cut.wav out.wav
 ffmpeg version N-87764-gb2f256a Copyright (c) 2000-2017 the FFmpeg
 developers
   built with gcc 6.3.0 (GCC)
   configuration: --enable-gpl
   libavutil      55. 77.101 / 55. 77.101
   libavcodec     57.106.104 / 57.106.104
   libavformat    57. 83.100 / 57. 83.100
   libavdevice    57.  9.102 / 57.  9.102
   libavfilter     6.106.101 /  6.106.101
   libswscale      4.  7.103 /  4.  7.103
   libswresample   2.  8.100 /  2.  8.100
   libpostproc    54.  6.100 / 54.  6.100
 [dts @ 0x39fb3a0] Estimating duration from bitrate, this may be inaccurate
 Input #0, dts, from 'Engelsstaub - Anderswelt.dts.cut.wav':
   Duration: 00:00:14.51, start: 0.000000, bitrate: 1411 kb/s
     Stream #0:0: Audio: dts (DTS), 44100 Hz, 5.1(side), fltp, 1411 kb/s
 Stream mapping:
   Stream #0:0 -> #0:0 (dts (dca) -> pcm_s16le (native))
 Press [q] to stop, [?] for help
 Output #0, wav, to 'out.wav':
   Metadata:
     ISFT            : Lavf57.83.100
     Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz,
 5.1(side), s16, 4233 kb/s
     Metadata:
       encoder         : Lavc57.106.104 pcm_s16le
 size=    3750kB time=00:00:07.25 bitrate=4237.4kbits/s speed= 163x
 video:0kB audio:3750kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: 0.002656%
 }}}

--
Ticket URL: <https://trac.ffmpeg.org/ticket/6723#comment:13>
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