[FFmpeg-trac] #2686(avcodec:new): Native AAC encoder collapses at high bitrates on some samples
FFmpeg
trac at avcodec.org
Wed Jun 19 06:07:22 CEST 2013
#2686: Native AAC encoder collapses at high bitrates on some samples
------------------------------------+-----------------------------------
Reporter: Kamedo2 | Owner:
Type: defect | Status: new
Priority: normal | Component: avcodec
Version: git-master | Resolution:
Keywords: aac | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Comment (by Kamedo2):
Yes, the output aac files sounded better with release 1.2.1 I've
downloaded from
http://www.ffmpeg.org/releases/ffmpeg-1.2.1.tar.bz2
Still, the quality of the native aac at 320kbps is poorer than the native
aac 256kbps.
{{{
ffmpeg version 1.2.1 Copyright (c) 2000-2013 the FFmpeg developers
built on Jun 19 2013 12:38:13 with gcc 4.8.1 (GCC)
configuration: --enable-gpl --enable-version3 --enable-libmp3lame
--enable-lib
vorbis --enable-nonfree --enable-libfdk-aac --enable-libvo_aacenc
--enable-libfa
ac --extra-ldflags=-static --extra-cflags='-march=nocona -mfpmath=sse'
--optflag
s=-O2
libavutil 52. 18.100 / 52. 18.100
libavcodec 54. 92.100 / 54. 92.100
libavformat 54. 63.104 / 54. 63.104
libavdevice 54. 3.103 / 54. 3.103
libavfilter 3. 42.103 / 3. 42.103
libswscale 2. 2.100 / 2. 2.100
libswresample 0. 17.102 / 0. 17.102
libpostproc 52. 2.100 / 52. 2.100
[flac @ 01405c20] max_analyze_duration 5000000 reached at 5015510
microseconds
Input #0, flac, from 'ffmpeg_aac320k_collapse.flac
':
Duration: 00:00:18.01, bitrate: 573 kb/s
Stream #0:0: Audio: flac, 44100 Hz, stereo, s16
Output #0, mp4, to 'ffmpeg_aac320k_collapse.mp4':
Metadata:
encoder : Lavf54.63.104
Stream #0:0: Audio: aac ([64][0][0][0] / 0x0040), 44100 Hz, stereo,
fltp, 32
0 kb/s
Stream mapping:
Stream #0:0 -> #0:0 (flac -> aac)
Press [q] to stop, [?] for help
size= 289kB time=00:00:18.01 bitrate= 131.3kbits/s
video:0kB audio:285kB subtitle:0 global headers:0kB muxing overhead
1.321136%
}}}
--
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2686#comment:2>
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