[mythtv-users] Playback issue with certain video
Mark Greenwood
fatgerman at gmail.com
Sun Oct 21 13:41:33 UTC 2012
On 21 Oct 2012, at 11:40, Martin Moores wrote:
> On 20 October 2012 22:37, Jean-Yves Avenard <jean-yves at avenard.org> wrote:
>>
>>
>> On Sunday, 21 October 2012, Mark Greenwood wrote:
>>>
>>>
>>> I haven't tried playing it on my myth box, but I can tell you it's MJPEG,
>>> not MPEG2, which might be why your myth box is having trouble with it. File
>>> seems OK for an MJPEG file though, it's 30fps at 640x480 resolution. The
>>> audio is 8-bit PCM, mono, 8KHz, which is unusual and could also be the
>>> source of the problem.
>>>
>>>
>> The format of the audio is irrelevant, myth will perform any conversion on
>> the fly as required and is able to play 8, 16, 24, 32 bits integer and float
>> audio
>>
>
> Thanks for the replies both. If Myth doesn't know what it is and
> guesses wrong, then I guess that could be the issue. I have no idea
> how to tell though.
>
> Hopefully someone will get chance to take a look
OK I've tried it on my myth box (0.25) and I get similar playback errors to you - it plays but it stutters.
Mine does recognise it as MJPG :
2012-10-21 14:26:53.641 AFD: Opened codec 0xa3092d10, id(MJPEG) type(Video)
2012-10-21 14:26:53.641 AFD: codec PCM_U8 has 1 channels
2012-10-21 14:26:53.641 AFD: codec PCM_U8 has 1 channels
2012-10-21 14:26:53.641 AFD: Opened codec 0xa3093580, id(PCM_U8) type(Audio)
2012-10-21 14:26:53.923 AO: Resampling from 8 kHz to 32 kHz with quality medium
2012-10-21 14:26:53.951 AO: Opening audio device 'hdmi:CARD=NVidia,DEV=0' ch 2(1) sr 32000 sf signed 32 bit reenc 0
2012-10-21 14:26:53.962 AudioPlayer: Enabling Audio
After that I get loads of
2012-10-21 14:26:59.551 Player(3): Waited 100ms for video buffers ffffffffffffffffffffffAf
2012-10-21 14:26:59.551 Player(3): Timed out waiting for frames, and
there are not enough free frames. Discarding buffered frames.
2012-10-21 14:26:59.560 Player(3): Waited 100ms for video buffers AAAAAAAAAAAAAAAAAAAAAAAA
2012-10-21 14:27:00.096 ALSA, Error: WriteAudio: buffer underrun
2012-10-21 14:27:00.823 Player(3): Waited 100ms for video buffers fffffffffffffffffffffAff
etc etc.
As an experiment I bunged it into avidemux and tried two variants:
Copy the video stream but convert the audio to MP3 - same playback problem.
Convert the video to x264 but keep the audio stream the same - plays perfectly.
So it's either something dodgy with your file (avidemux thinks it's fine) or myth has issues with MJPG.
Mark
Mark
>
> Cheers
>
> Martin
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