[FFmpeg-trac] #3816(undetermined:new): Native AAC encoder, problematic sample.
FFmpeg
trac at avcodec.org
Wed Jul 30 08:36:35 CEST 2014
#3816: Native AAC encoder, problematic sample.
-------------------------------------+-------------------------------------
Reporter: YellowOnion | Type: defect
Status: new | Priority: normal
Component: | Version:
undetermined | unspecified
Keywords: aac | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
Summary of the bug:
at mid-low (96-128) bitrates the native encoder produces highly distorted
signal that isn't perceptively the same as the original, libvo-aac though
generally worse, performs better on this specific sample.
How to reproduce:
{{{
H:\Workings\Audio\Listening Tests\Test2.0>\video-working\ffmpeg -i
trans.wav -vn -strict experimental -c:a aac -b:a 128k trans.ff128.m4a
ffmpeg version N-64919-ga613257 Copyright (c) 2000-2014 the FFmpeg
developers
built on Jul 23 2014 00:35:22 with gcc 4.8.3 (GCC)
configuration: --enable-gpl --enable-version3 --disable-w32threads
--enable-avisynth --enable-bzlib --enable-fontcon
fig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass
--enable-libbluray --enable-libbs2b --enable-libcac
a --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc
--enable-libmodplug --enable-libmp3lame --enab
le-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg
--enable-libopus --enable-librtmp --enable-libsch
roedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-
libtwolame --enable-libvidstab --enable-libvo
-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx
--enable-libwavpack --enable-libwebp --enable-libx2
64 --enable-libx265 --enable-libxavs --enable-libxvid --enable-decklink
--enable-zlib
libavutil 52. 92.101 / 52. 92.101
libavcodec 55. 69.100 / 55. 69.100
libavformat 55. 48.101 / 55. 48.101
libavdevice 55. 13.102 / 55. 13.102
libavfilter 4. 11.102 / 4. 11.102
libswscale 2. 6.100 / 2. 6.100
libswresample 0. 19.100 / 0. 19.100
libpostproc 52. 3.100 / 52. 3.100
Guessed Channel Layout for Input Stream #0.0 : stereo
Input #0, wav, from 'trans.wav':
Duration: 00:00:30.00, bitrate: 1411 kb/s
Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, 2
channels, s16, 1411 kb/s
Output #0, ipod, to 'trans.ff128.m4a':
Metadata:
encoder : Lavf55.48.101
Stream #0:0: Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp,
128 kb/s
Metadata:
encoder : Lavc55.69.100 aac
Stream mapping:
Stream #0:0 -> #0:0 (pcm_s16le (native) -> aac (native))
Press [q] to stop, [?] for help
size= 476kB time=00:00:30.00 bitrate= 130.0kbits/s
video:0kB audio:470kB subtitle:0kB other streams:0kB global headers:0kB
muxing overhead: 1.229722%
}}}
--
Ticket URL: <https://trac.ffmpeg.org/ticket/3816>
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