[FFmpeg-trac] #7576(avcodec:new): Convert to AC3 fail to give a correct output

FFmpeg trac at avcodec.org
Wed Nov 28 03:39:00 EET 2018


#7576: Convert to AC3 fail to give a correct output
------------------------------------+-----------------------------------
             Reporter:  Sami32      |                    Owner:
                 Type:  defect      |                   Status:  new
             Priority:  normal      |                Component:  avcodec
              Version:  git-master  |               Resolution:
             Keywords:  ac3         |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |
------------------------------------+-----------------------------------

Comment (by cehoyos):

 Replying to [comment:3 Sami32]:
 > Shouldn't this AC3 track have been showed?

 I believe the AC-3 track is shown correctly by current FFmpeg, but maybe I
 misunderstand?
 {{{
 $ ffmpeg -i dolby_EAC3_TrueHD_amaze_lossless-DWEU.m2ts
 ffmpeg version N-92543-g8cc5107 Copyright (c) 2000-2018 the FFmpeg
 developers
   built with gcc 6.4.0 (GCC)
   configuration: --enable-gpl --enable-libxml2 --enable-gnutls
   libavutil      56. 24.101 / 56. 24.101
   libavcodec     58. 40.100 / 58. 40.100
   libavformat    58. 23.100 / 58. 23.100
   libavdevice    58.  6.100 / 58.  6.100
   libavfilter     7. 46.101 /  7. 46.101
   libswscale      5.  4.100 /  5.  4.100
   libswresample   3.  4.100 /  3.  4.100
   libpostproc    55.  4.100 / 55.  4.100
 Input #0, mpegts, from 'dolby_EAC3_TrueHD_amaze_lossless-DWEU.m2ts':
   Duration: 00:01:03.52, start: 4200.000000, bitrate: 22899 kb/s
   Program 1
     Stream #0:0[0x1011](eng): Video: h264 (High) (HDMV / 0x564D4448),
 yuv420p(progressive), 1920x1080, 24 fps, 24 tbr, 90k tbn, 48 tbc
     Stream #0:1[0x1100]: Audio: truehd (AC-3 / 0x332D4341), 48000 Hz, 7.1,
 s32 (24 bit)
     Stream #0:2[0x1100]: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz,
 5.1(side), fltp, 640 kb/s
     Stream #0:3[0x1101]: Audio: eac3 (AC-3 / 0x332D4341), 48000 Hz, 7.1,
 fltp, 1664 kb/s
 At least one output file must be specified
 }}}

 > The audio stream n°1 doesn't seem be a real one.

 What is not real about what audio stream?

 > I suspect it to be a substream.

 Yes, I believe the AC-3 tracks that come with every TrueHD track on a
 Bluray are called ''substreams''.

 > The 0 and 2 seem correct audio streams.

 What makes an audio stream ''correct'' or ''incorrect'' in this context?

--
Ticket URL: <https://trac.ffmpeg.org/ticket/7576#comment:4>
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