#5121: Wrong sample rate read from / written to opus webm file
-------------------------------------+-------------------------------------
Reporter: pszemus | Type: defect
Status: new | Priority: normal
Component: | Version:
undetermined | unspecified
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
Summary of the bug:
As reported in https://bugzilla.mozilla.org/show_bug.cgi?id=1227153 trying
to create a 24kHz opus@webm file produces a file that has 48kHz written to
an opus header (?). What's strange is that MediaInfo shows this sample
rate correctly.
How to reproduce:
{{{
$ ffmpeg -i
http://www.soundsnap.com/audio/play/72210%3A1448291371%3Ab4326304c013a3a61b3b87d83158c91b
-c:a libopus -b:a 64k -ar 24000 /tmp/tmp.webm
ffmpeg version N-77704-g68eb208 Copyright (c) 2000-2016 the FFmpeg
developers
built with gcc 4.8.5 (GCC) 20150623 (Red Hat 4.8.5-4)
configuration: --prefix=/home/pszemus/ffmpeg/build --enable-pic
--enable-pthreads --enable-libmp3lame --enable-version3 --enable-libfaac
--enable-gpl --enable-nonfree --enable-libvpx --enable-libvorbis --enable-
libopus --enable-libx264 --enable-libwebp --enable-protocol=https
--enable-openssl --extra-cflags=-I/opt/WP/common.libs/include --extra-
ldflags='-L/opt/WP/common.libs/lib -ldl'
libavutil 55. 12.100 / 55. 12.100
libavcodec 57. 21.100 / 57. 21.100
libavformat 57. 21.100 / 57. 21.100
libavdevice 57. 0.100 / 57. 0.100
libavfilter 6. 23.100 / 6. 23.100
libswscale 4. 0.100 / 4. 0.100
libswresample 2. 0.101 / 2. 0.101
libpostproc 54. 0.100 / 54. 0.100
[mp3 @ 0x2ae63a0] Skipping 0 bytes of junk at 0.
[mp3 @ 0x2ae63a0] Estimating duration from bitrate, this may be inaccurate
Input #0, mp3, from
'http://www.soundsnap.com/audio/play/72210%3A1448291371%3Ab4326304c013a3a61b3b87d83158c91b':
Metadata:
title : PleaseRefesh2015_1
date : 2015
track : 1
Duration: 00:00:04.13, start: 0.000000, bitrate: 192 kb/s
Stream #0:0: Audio: mp3, 44100 Hz, stereo, s16p, 192 kb/s
Output #0, webm, to '/tmp/tmp.webm':
Metadata:
title : PleaseRefesh2015_1
date : 2015
track : 1
encoder : Lavf57.21.100
Stream #0:0: Audio: opus (libopus), 24000 Hz, stereo, s16, 64 kb/s
Metadata:
encoder : Lavc57.21.100 libopus
Stream mapping:
Stream #0:0 -> #0:0 (mp3 (native) -> opus (libopus))
Press [q] to stop, [?] for help
size= 37kB time=00:00:04.13 bitrate= 73.7kbits/s speed=15.4x
video:0kB audio:35kB subtitle:0kB other streams:0kB global headers:0kB
muxing overhead: 5.376523%
}}}
{{{
$ ffmpeg -i /tmp/tmp.webm
ffmpeg version N-77704-g68eb208 Copyright (c) 2000-2016 the FFmpeg
developers
built with gcc 4.8.5 (GCC) 20150623 (Red Hat 4.8.5-4)
configuration: --prefix=/home/pszemus/ffmpeg/build --enable-pic
--enable-pthreads --enable-libmp3lame --enable-version3 --enable-libfaac
--enable-gpl --enable-nonfree --enable-libvpx --enable-libvorbis --enable-
libopus --enable-libx264 --enable-libwebp --enable-protocol=https
--enable-openssl --extra-cflags=-I/opt/WP/common.libs/include --extra-
ldflags='-L/opt/WP/common.libs/lib -ldl'
libavutil 55. 12.100 / 55. 12.100
libavcodec 57. 21.100 / 57. 21.100
libavformat 57. 21.100 / 57. 21.100
libavdevice 57. 0.100 / 57. 0.100
libavfilter 6. 23.100 / 6. 23.100
libswscale 4. 0.100 / 4. 0.100
libswresample 2. 0.101 / 2. 0.101
libpostproc 54. 0.100 / 54. 0.100
Input #0, matroska,webm, from '/tmp/tmp.webm':
Metadata:
title : PleaseRefesh2015_1
encoder : Lavf57.21.100
Duration: 00:00:04.14, start: 0.007000, bitrate: 73 kb/s
Stream #0:0: Audio: opus, 48000 Hz, stereo, fltp (default)
At least one output file must be specified
}}}
{{{
$ mediainfo /tmp/tmp.webm
General
Unique ID :
23699742163318188445154506414781705045
(0x11D46780E7425B3B392AC806ACE92B55)
Complete name : /tmp/tmp.webm
Format : WebM
Format version : Version 4 / Version 2
File size : 37.2 KiB
Duration : 4s 135ms
Overall bit rate : 73.6 Kbps
Track name : PleaseRefesh2015_1
Writing application : Lavf57.21.100
Writing library : Lavf57.21.100
Audio
ID : 1
Format : Opus
Codec ID : A_OPUS
Duration : 4s 135ms
Channel(s) : 2 channels
Channel positions : Front: L R
Sampling rate : 24.0 KHz
Bit depth : 16 bits
Compression mode : Lossy
Default : Yes
Forced : No
}}}
--
Ticket URL: <https://trac.ffmpeg.org/ticket/5121>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker
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