[FFmpeg-trac] #2686(avcodec:new): Native AAC encoder collapses at high bitrates on some samples
FFmpeg
trac at avcodec.org
Wed Jun 19 20:36:27 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 |
------------------------------------+-----------------------------------
Comment (by Kamedo2):
Oops, you said original release 1.2.
Release 1.2 and 1.2.1 had the same behavior -- the first sample collapses
at 432-464kbps.
As for N-54096-ge41bf19 I've got from git -- the first sample collapses at
256-432kbps.
These two groups have the distinct "degradation range". Release 1.2 and
1.2.1 have much narrower degradation range, and the 1.2* is less severe at
the range. N-54096-ge41bf19 at 352kbps is the worst quality.
{{{
ffmpeg version 1.2 Copyright (c) 2000-2013 the FFmpeg developers
built on Jun 20 2013 03:06:34 with gcc 4.8.1 (GCC)
configuration: --enable-version3 --enable-nonfree --enable-libfdk-aac
--extra-
ldflags=-static --extra-cflags='-march=native' --optflags=-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
[flac @ 03295c20] max_analyze_duration 5000000 reached at 5015510
microseconds
Input #0, flac, from 'C:\Users\PCC\Documents\ABC-
HR\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 'C:\Users\PCC\Documents\ABC-
HR\05-true_my_heart_2m50s_320k_12
.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:3>
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