#2686: Native AAC encoder collapses at high bitrates on some samples
-------------------------------------+-------------------------------------
Reporter: Kamedo2 | Owner:
Type: defect | Status: open
Priority: normal | Component: avcodec
Version: git-master | Resolution:
Keywords: aac | Blocked By:
regression | Reproduced by developer: 1
Blocking: |
Analyzed by developer: 0 |
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Comment (by Kamedo2):
I listened to about 8 hours of songs, movies, sine and white noise, and
5.1ch surround source. I'd say that abr is mature.
klaussfreire, could you add a "redirect" feature that when set bitrate is
too high, redirect to the maximum bitrate possible, rather than to print
the error message and stop. This simplify many batch encodes, including
when encoding from hundreds of videos that have various audio frequencies
and number of channels. Currently it gets:
{{{
[aac @ 013efa60] Too many bits per frame requested
}}}
Also, I notice that this commandline
{{{
ffmpeg -i ffmpeg_aacvbr_pulse1.wav -c:a aac -strict experimental -q:a 0.1
-ar 8000 -ac 1 ffmpeg_aacvbr_pulse1.mp4
}}}
gets the same Too many bits warning, and lowering the quality -q:a don't
work. It only works when using -b:a, or setting higher frequency such as
-ar 22050. It could be a problem when encoding from a video taken by some
old digital cameras with 8kHz pcm audio attached.
The error message:
{{{
ffmpeg56470.exe -y -i ffmpeg_aacvbr_pulse1.wav -c:a aac -strict
experimental -q:a
0.3 -ar 8000 ffmpeg_aacvbr_pulse1.mp4
ffmpeg version N-56469-gf6622f9 Copyright (c) 2000-2013 the FFmpeg
developers
built on Sep 20 2013 15:29:55 with gcc 4.8.1 (GCC)
configuration: --enable-gpl --enable-version3 --enable-nonfree --enable-
libfdk
-aac --extra-ldflags=-static --extra-cflags='-march=native -mfpmath=sse'
--optfl
ags=-O2
libavutil 52. 45.100 / 52. 45.100
libavcodec 55. 33.100 / 55. 33.100
libavformat 55. 18.100 / 55. 18.100
libavdevice 55. 3.100 / 55. 3.100
libavfilter 3. 86.102 / 3. 86.102
libswscale 2. 5.100 / 2. 5.100
libswresample 0. 17.103 / 0. 17.103
libpostproc 52. 3.100 / 52. 3.100
Guessed Channel Layout for Input Stream #0.0 : stereo
Input #0, wav, from 'ffmpeg_aacvbr_pulse1.wav':
Metadata:
encoder : Coderium SoundEngine 4.59
Duration: 00:00:12.12, bitrate: 1411 kb/s
Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz,
stereo, s16
, 1411 kb/s
[aac @ 030cbf00] Too many bits per frame requested
Output #0, mp4, to 'ffmpeg_aacvbr_pulse1.mp4':
Metadata:
encoder : Coderium SoundEngine 4.59
Stream #0:0: Audio: aac, 8000 Hz, stereo, fltp, 128 kb/s
Stream mapping:
Stream #0:0 -> #0:0 (pcm_s16le -> aac)
Error while opening encoder for output stream #0:0 - maybe incorrect
parameters
such as bit_rate, rate, width or height
}}}
I think this is about time we remove the -strict experimental flag.
--
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2686#comment:161>
FFmpeg <http://ffmpeg.org>
FFmpeg issue tracker
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