[FFmpeg-user] mp3 sound bug

[Ingo Brückl]

Carl Eugen Hoyos wrote on Sun, 20 Nov 2011 15:56:22 +0000 (UTC):

> Ingo Brückl <ib <at> wupperonline.de> writes:

>> Commit 22e25c002e103e52ace35703423e896b08b51aef introduced some bug that
>> makes ffmp3float produce no sound but only occasional crackles.

> Complete, uncut output missing and please point to a sample on
> samples.mplayerhq.hu that allows to reproduce the problem.

Sample (including both the mp3 and output of './ffmpeg -i 4210.mp3 outf.wav')
can be found at http://www.load.to/gFAEGFe4Wy/outf.zip. ffmepg has been
compiled with --disable-decoder=mp2,mp3 to force usage of mp3float. Output
attached, CPU info follows:

processor	: 0
vendor_id	: AuthenticAMD
cpu family	: 6
model		: 6
model name	: AMD Athlon(tm) XP 1700+
stepping	: 2
cpu MHz		: 1465.933
cache size	: 256 KB
fdiv_bug	: no
hlt_bug		: no
f00f_bug	: no
coma_bug	: no
fpu		: yes
fpu_exception	: yes
cpuid level	: 1
wp		: yes
flags		: fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca cmov pat pse36 mmx fxsr sse syscall mp mmxext 3dnowext 3dnow
bogomips	: 2931.86
clflush size	: 32
power management: ts

ffmpeg's mp3float produces only 00 80 patterns with any mp3.

Ingo
-------------- next part --------------
[mp3 @ 0x9daba80] max_analyze_duration 5000000 reached at 5015510
[mp3 @ 0x9daba80] Estimating duration from bitrate, this may be inaccurate
Input #0, mp3, from '4210.mp3':
  Metadata:
    comment         :
    genre           : Other
  Duration: 00:01:04.87, start: 0.000000, bitrate: 95 kb/s
    Stream #0:0: Audio: mp3, 44100 Hz, stereo, flt, 96 kb/s
Incompatible sample format 'flt' for codec 'pcm_s16le', auto-selecting format 's16'
Output #0, wav, to 'outf.wav':
  Metadata:
    comment         :
    genre           : Other
    encoder         : Lavf53.21.0
    Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, stereo, s16, 1411 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (mp3float -> pcm_s16le)
Press [q] to stop, [?] for help
size=    9792kB time=00:00:57.02 bitrate=1406.7kbits/s
size=   11115kB time=00:01:04.52 bitrate=1411.2kbits/s
video:0kB audio:11115kB global headers:0kB muxing overhead 0.000404%