mplayer SVN plays video too fast on FreeBSD

[Tom Evans]

On Tue, Dec 8, 2009 at 3:44 PM, Tom Evans <tevans.uk at googlemail.com> wrote:
> On Tue, Dec 8, 2009 at 3:14 PM, Robert Noland <rnoland at freebsd.org> wrote:
>> On Mon, 2009-12-07 at 19:14 +0000, Tom Evans wrote:
>>> Hi all
>>>
>>> I sent this to the mplayer mailing list earlier today, without
>>> thinking that probably someone on multimedia@ has tried to compile
>>> mplayer from svn. Has anyone succesfully managed to do it? - and get a
>>> working player out of it!
>>
>> I haven't tried mplayer from SVN, but the video playing too fast issue
>> is your audio codec.  mplayer (and gstreamer, iirc) seem to set the
>> frame rate based on the audio.  Generally, what I have seen is that
>> people with ATI/AMD (radeon) video cards with HDMI ports end up with the
>> HDMI port as dsp0.  If you aren't running the radeonhd driver with the
>> AUDIO option set, the codec isn't initialized properly and so the video
>> plays too fast.  To correct this issue, usually all you need to do is
>> set the sysctl hw.snd.default_unit to the correct pcm device. Basically,
>> if you have the following:
>>
>> balrog% cat /dev/sndstat
>> FreeBSD Audio Driver (newpcm: 64bit 2009061500/amd64)
>> Installed devices:
>> pcm0: <HDA ATI R6xx HDMI PCM #0 HDMI> at cad 0 nid 1 on hdac0 kld
>> snd_hda [MPSAFE] (1p:1v/0r:0v channels simplex)
>> pcm1: <HDA Analog Devices AD1989B PCM #0 Analog> at cad 0 nid 1 on hdac1
>> kld snd_hda [MPSAFE] (1p:4v/1r:2v channels duplex default)
>> pcm2: <HDA Analog Devices AD1989B PCM #1 Analog> at cad 0 nid 1 on hdac1
>> kld snd_hda [MPSAFE] (1p:1v/0r:0v channels simplex)
>> pcm3: <HDA Analog Devices AD1989B PCM #2 Digital> at cad 0 nid 1 on
>> hdac1 kld snd_hda [MPSAFE] (1p:1v/0r:0v channels simplex)
>> pcm4: <HDA Analog Devices AD1989B PCM #3 Digital> at cad 0 nid 1 on
>> hdac1 kld snd_hda [MPSAFE] (1p:1v/0r:0v channels simplex)
>>
>> Setting "sysctl hw.snd.default_unit=1" will choose the primary analog
>> pcm for audio output and mplayer will work fine.
>>
>> robert.
>>
>
> Thanks Robert, the mplayer list also said that mplayer syncs to audio,
> so I've got a few things to check there tonight :)
>
> I'm not using radeonhd or hdmi, I have an amplifier connected to the
> onboard snd_hda via spdif, and use spdif pass through if available on
> the source. I already specify hw.snd.default_unit=2, since that is
> seemingly the correct device:
>
> FreeBSD Audio Driver (newpcm: 64bit 2009061500/amd64)
> Installed devices:
> pcm0: <HDA VIA VT1708S_0 PCM #0 Analog> at cad 0 nid 1 on hdac0 kld
> snd_hda [MPSAFE] (1p:1v/1r:1v channels duplex)
> pcm1: <HDA VIA VT1708S_0 PCM #1 Digital> at cad 0 nid 1 on hdac0 kld
> snd_hda [MPSAFE] (1p:1v/0r:0v channels simplex)
> pcm2: <HDA VIA VT1708S_0 PCM #2 Digital> at cad 0 nid 1 on hdac0 kld
> snd_hda [MPSAFE] (1p:1v/0r:0v channels simplex default)
>
> Audio plays correctly for both AC3 and MP3 audio tracks in both
> mplayer svn and the port. I wonder if it is possible the codec on this
> snd_hda card is slightly 'strange' and doing something out of the
> ordinary - maybe I'll have a browse of the linux azalia driver and see
> if they have any quirks for it.
>
> Cheers
>
> Tom
>

Ok, I've made a few more tests. It seems that the problem only comes
about when I run mplayer svn with '-ao oss -afm hwac3'. If I run with
'-ao none' or with '-ao oss' (ie playing 2 channel pcm out over the
digital output), then the video plays back at the correct rate.

Just to reiterate, all of those options work correctly with the
version in ports - if only that supported vdpau :)

Alexander, is this like anything you have come across before with the
snd_hda driver? I have bootverbose logs of snd_hda if that helps[1].

Cheers

Tom

[1] http://pastebin.ca/1707268