Opened 5 years ago

Closed 5 years ago

#4006 closed defect (duplicate)

FFmpeg not parsing Center channel in mov as Center.

Reported by: billys Owned by:
Priority: normal Component: avutil
Version: git-master Keywords: mov chan
Cc: Blocked By:
Blocking: Reproduced by developer: no
Analyzed by developer: no

Description

I am trying to extract the audio channel assignments from a MOV. The channel assignments where done using Quicktime Pro 7. The file has 6 mono audio streams which make up a 5.1 channel set. I am expecting to see FL, FR, FC, LFE, BL, BR across the streams.

The issue is that I am seeing 'mono' instead of FC.

I believe this is an issue with avutil, where that it cannot distinguish between a true mono 1.0 channel and a Center channel that is a part of a surround sound channel set.

I will attach the file I have used to this post. Please find the full uncut console output below. Thank you.

ffmpeg started on 2014-10-05 at 02:21:30
Report written to "ffmpeg-20141005-022130.log"
Command line:
ffmpeg -i qpro.mov -report
ffmpeg version 2.3.3 Copyright (c) 2000-2014 the FFmpeg developers

built on Oct 4 2014 22:09:55 with Apple LLVM version 6.0 (clang-600.0.38) (based on LLVM 3.5svn)
configuration: --prefix=/usr/local/Cellar/ffmpeg/2.3.3 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-nonfree --enable-hardcoded-tables --enable-avresample --enable-vda --cc=clang --host-cflags= --host-ldflags= --enable-libx264 --enable-libfaac --enable-libmp3lame --enable-libxvid --enable-libfdk-aac --enable-openssl
libavutil 52. 92.100 / 52. 92.100
libavcodec 55. 69.100 / 55. 69.100
libavformat 55. 48.100 / 55. 48.100
libavdevice 55. 13.102 / 55. 13.102
libavfilter 4. 11.100 / 4. 11.100
libavresample 1. 3. 0 / 1. 3. 0
libswscale 2. 6.100 / 2. 6.100
libswresample 0. 19.100 / 0. 19.100
libpostproc 52. 3.100 / 52. 3.100

Splitting the commandline.
Reading option '-i' ... matched as input file with argument 'qpro.mov'.
Reading option '-report' ... matched as option 'report' (generate a report) with argument '1'.
Finished splitting the commandline.
Parsing a group of options: global .
Applying option report (generate a report) with argument 1.
Successfully parsed a group of options.
Parsing a group of options: input file qpro.mov.
Successfully parsed a group of options.
Opening an input file: qpro.mov.
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fb90300f000] Format mov,mp4,m4a,3gp,3g2,mj2 probed with size=2048 and score=100
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fb90300f000] ISO: File Type Major Brand: qt
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fb90300f000] Before avformat_find_stream_info() pos: 158489 bytes read:43765 seeks:1
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fb90300f000] All info found
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fb90300f000] After avformat_find_stream_info() pos: 18468 bytes read:76533 seeks:2 frames:6
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'qpro.mov':

Metadata:

major_brand : qt
minor_version : 512
compatible_brands: qt
encoder : Lavf55.21.100

Duration: 00:00:00.17, start: 0.000000, bitrate: 7414 kb/s

Stream #0:0(eng), 1, 1/48000: Audio: pcm_s24be (in24 / 0x34326E69), 48000 Hz, 1 channels (FL), s32, 1152 kb/s (default)
Metadata:

handler_name : Apple Alias Data Handler

Stream #0:1(eng), 1, 1/48000: Audio: pcm_s24be (in24 / 0x34326E69), 48000 Hz, 1 channels (FR), s32, 1152 kb/s
Metadata:

handler_name : Apple Alias Data Handler

Stream #0:2(eng), 1, 1/48000: Audio: pcm_s24be (in24 / 0x34326E69), 48000 Hz, mono, s32, 1152 kb/s
Metadata:

handler_name : Apple Alias Data Handler

Stream #0:3(eng), 1, 1/48000: Audio: pcm_s24be (in24 / 0x34326E69), 48000 Hz, 1 channels (LFE), s32, 1152 kb/s
Metadata:

handler_name : Apple Alias Data Handler

Stream #0:4(eng), 1, 1/48000: Audio: pcm_s24be (in24 / 0x34326E69), 48000 Hz, 1 channels (BL), s32, 1152 kb/s
Metadata:

handler_name : Apple Alias Data Handler

Stream #0:5(eng), 1, 1/48000: Audio: pcm_s24be (in24 / 0x34326E69), 48000 Hz, 1 channels (BR), s32, 1152 kb/s
Metadata:

handler_name : Apple Alias Data Handler

Successfully opened the file.
At least one output file must be specified
[AVIOContext @ 0x7fb9025011a0] Statistics: 76533 bytes read, 2 seeks

Attachments (1)

qpro.mov (154.8 KB) - added by billys 5 years ago.
Mov with 5.1 channels spread over 6 mono audio streams.

Download all attachments as: .zip

Change History (3)

Changed 5 years ago by billys

Mov with 5.1 channels spread over 6 mono audio streams.

comment:1 Changed 5 years ago by cehoyos

  • Keywords mov chan added
  • Version changed from unspecified to git-master

This is a duplicate of (one aspect of) ticket #2865 but please understand that there is nothing to fix: FFmpeg calls the center channel "mono".

For future tickets: Please always test current FFmpeg git head before reporting issues.

comment:2 Changed 5 years ago by cehoyos

  • Resolution set to duplicate
  • Status changed from new to closed
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