id,summary,reporter,owner,description,type,status,priority,component,version,resolution,keywords,cc,blockedby,blocking,reproduced,analyzed
363,libavcodec 0.7.1 breaks libasound_module_pcm_a52.so (from libasound2-plugins),piru,,"It appears that the libavcodec 0.7.1 broke alsa AC-3 encoding. After the upgrade a setup that was working just fine before became silent. Debugging it I ran into this:

{{{
$ aplay /home/user/music/5_DRAX_-_Resolution_R3\&R4AR.wav
Playing WAVE '/home/user/music/5_DRAX_-_Resolution_R3&R4AR.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Stereo
[ac3 @ 0x1a72360] Specified sample_fmt is not supported.
aplay: set_params:1116: Unable to install hw params:
ACCESS:  RW_INTERLEAVED
FORMAT:  S16_LE
SUBFORMAT:  STD
SAMPLE_BITS: 16
FRAME_BITS: 32
CHANNELS: 2
RATE: 48000
PERIOD_TIME: 32000
PERIOD_SIZE: 1536
PERIOD_BYTES: 6144
PERIODS: 10
BUFFER_TIME: 320000
BUFFER_SIZE: 15360
BUFFER_BYTES: 61440
TICK_TIME: 0
}}}

{{{
$ sudo dpkg -i libavcodec52_0.6.3-0.0_amd64.deb
dpkg: warning: downgrading libavcodec52 from 5:0.7.1-0.0 to 5:0.6.3-0.0.
(Reading database ... 218630 files and directories currently installed.)
Preparing to replace libavcodec52 5:0.7.1-0.0 (using libavcodec52_0.6.3-0.0_amd64.deb) ...
Unpacking replacement libavcodec52 ...
Setting up libavcodec52 (5:0.6.3-0.0) ...
}}}

{{{
$ aplay /home/user/music/5_DRAX_-_Resolution_R3\&R4AR.wav
Playing WAVE '/home/user/music/5_DRAX_-_Resolution_R3&R4AR.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Stereo
}}}

...and the audio plays ok now.

I'm using debian unstable and kernel 2.6.39.3 and packages from debian-multimedia.org. I have audio routed via HDMI, and thus I've set up alsa so that all non-AC-3 audio goes thru the a52 encoding:

{{{
pcm.Filter_A52Encode {
    type a52
    bitrate 448
    card 0
}
...etc...
}}}

I presume something is wrong with libavcodec52 0.7.1 AC-3 encoding since it fails with ""[ac3 @ 0x1a72360] Specified sample_fmt is not supported.""

I haven't done any further analysis of the issue and it could well be something unrelated to ffmpeg.

Some related package versions:
{{{
alsa-utils                        1.0.23-5+b1
libasound2                        1.0.24.1-2
libasound2-plugins                1.0.24-2
}}}
",defect,closed,normal,avcodec,0.7.1,fixed,libavcodec alsa a52 ac3 libasound2-plugins,,,,0,0