[FFmpeg-trac] #363(avcodec:new): libavcodec 0.7.1 breaks libasound_module_pcm_a52.so (from libasound2-plugins)

[FFmpeg]

#363: libavcodec 0.7.1 breaks libasound_module_pcm_a52.so (from
libasound2-plugins)
-------------------------------------------------+-------------------------
 Reporter:  piru                                 |        Type:  defect
   Status:  new                                  |    Priority:  important
Component:  avcodec                              |     Version:  0.7.1
 Keywords:  libavcodec alsa a52 ac3              |  Blocked By:
  libasound2-plugins                             |  Reproduced:  0
 Blocking:                                       |
 Analyzed:  0                                    |
-------------------------------------------------+-------------------------
 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
 }}}

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/363>
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