[FFmpeg-trac] #2497(avcodec:open): ALAC encoder adds a burst of white noise
FFmpeg
trac at avcodec.org
Wed Apr 24 12:42:15 CEST 2013
#2497: ALAC encoder adds a burst of white noise
------------------------------------+-----------------------------------
Reporter: pneuman | Owner:
Type: defect | Status: open
Priority: normal | Component: avcodec
Version: git-master | Resolution:
Keywords: alac | Blocked By:
Blocking: | Reproduced by developer: 1
Analyzed by developer: 0 |
------------------------------------+-----------------------------------
Changes (by cehoyos):
* status: new => open
* reproduced: 0 => 1
Comment:
{{{
$ ffmpeg -f s16le -ac 2 -i alac_encoding_error_white_noise_burst.raw
-acodec alac out.mov -f crc -
ffmpeg version N-52413-gad56535 Copyright (c) 2000-2013 the FFmpeg
developers
built on Apr 23 2013 16:00:56 with gcc 4.7 (SUSE Linux)
configuration: --enable-gpl --disable-indev=jack
libavutil 52. 27.100 / 52. 27.100
libavcodec 55. 6.100 / 55. 6.100
libavformat 55. 3.100 / 55. 3.100
libavdevice 55. 0.100 / 55. 0.100
libavfilter 3. 60.101 / 3. 60.101
libswscale 2. 2.100 / 2. 2.100
libswresample 0. 17.102 / 0. 17.102
libpostproc 52. 3.100 / 52. 3.100
[s16le @ 0x1957fe0] Estimating duration from bitrate, this may be
inaccurate
Guessed Channel Layout for Input Stream #0.0 : stereo
Input #0, s16le, from 'alac_encoding_error_white_noise_burst.raw':
Duration: 00:00:00.30, bitrate: 1411 kb/s
Stream #0:0: Audio: pcm_s16le, 44100 Hz, stereo, s16, 1411 kb/s
Output #0, mov, to 'out.mov':
Metadata:
encoder : Lavf55.3.100
Stream #0:0: Audio: alac (alac / 0x63616C61), 44100 Hz, stereo, s16p,
128 kb/s
Output #1, crc, to 'pipe:':
Metadata:
encoder : Lavf55.3.100
Stream #1:0: Audio: pcm_s16le, 44100 Hz, stereo, s16, 1411 kb/s
Stream mapping:
Stream #0:0 -> #0:0 (pcm_s16le -> alac)
Stream #0:0 -> #1:0 (pcm_s16le -> pcm_s16le)
Press [q] to stop, [?] for help
CRC=0xb3c2238d
size= 48kB time=00:00:00.37 bitrate=1067.4kbits/s
video:0kB audio:100kB subtitle:0 global headers:0kB muxing overhead
-51.431903%
}}}
{{{
$ ffmpeg -i out.mov -f crc -
ffmpeg version N-52413-gad56535 Copyright (c) 2000-2013 the FFmpeg
developers
built on Apr 23 2013 16:00:56 with gcc 4.7 (SUSE Linux)
configuration: --enable-gpl --disable-indev=jack
libavutil 52. 27.100 / 52. 27.100
libavcodec 55. 6.100 / 55. 6.100
libavformat 55. 3.100 / 55. 3.100
libavdevice 55. 0.100 / 55. 0.100
libavfilter 3. 60.101 / 3. 60.101
libswscale 2. 2.100 / 2. 2.100
libswresample 0. 17.102 / 0. 17.102
libpostproc 52. 3.100 / 52. 3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'out.mov':
Metadata:
major_brand : qt
minor_version : 512
compatible_brands: qt
encoder : Lavf55.3.100
Duration: 00:00:00.30, start: 0.000000, bitrate: 1313 kb/s
Stream #0:0(eng): Audio: alac (alac / 0x63616C61), 44100 Hz, stereo,
s16p, 1292 kb/s
Metadata:
handler_name : DataHandler
Output #0, crc, to 'pipe:':
Metadata:
major_brand : qt
minor_version : 512
compatible_brands: qt
encoder : Lavf55.3.100
Stream #0:0(eng): Audio: pcm_s16le, 44100 Hz, stereo, s16, 1411 kb/s
Metadata:
handler_name : DataHandler
Stream mapping:
Stream #0:0 -> #0:0 (alac -> pcm_s16le)
Press [q] to stop, [?] for help
[alac @ 0x2b76520] invalid element channel count
Error while decoding stream #0:0: Invalid data found when processing input
CRC=0x19605977
size= 0kB time=00:00:00.30 bitrate= 0.4kbits/s
video:0kB audio:36kB subtitle:0 global headers:0kB muxing overhead
-99.959310%
}}}
--
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2497#comment:3>
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