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RPI1-512 Audio Dropout playing HD multichannel music - Printable Version

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---- Thread: RPI1-512 Audio Dropout playing HD multichannel music (/showthread.php?tid=222061)

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RE: RPI1-512 Audio Dropout playing HD multichannel music - MrNice - 2015-03-29

@fritsch

Do you want
Set Output to Fixed, 5.1 channels, samplerate 48000
only,
or with hdmi_samples_limit=384000 as well?

@popcornmix
I'll test your just after


RE: RPI1-512 Audio Dropout playing HD multichannel music - fritsch - 2015-03-29

@MrNice: Should not matter.


RE: RPI1-512 Audio Dropout playing HD multichannel music - MrNice - 2015-03-29

@fritsch

I did the test:
From fresh image, update to OpenELEC Isengard build #0328

Set Output to Fixed, 5.1 channels, samplerate 48000
Play in file mode, no browsing
1 drop (@~25 s) during 4 minutes
Then change to full screen and no browsing for 4 more minutes
No drop
http://xbmclogs.com/pdnlhgcol


RE: RPI1-512 Audio Dropout playing HD multichannel music - fritsch - 2015-03-29

Okay, thx - now please continue with the tests popcornmix is asking for. I think what the firmware does, this "workaround" does fixed.


RE: RPI1-512 Audio Dropout playing HD multichannel music - MrNice - 2015-03-29

@popcornmix

I downloaded you zip. This is not a usual firmware update, what should I do with it?
I really am a newbie


RE: RPI1-512 Audio Dropout playing HD multichannel music - popcornmix - 2015-03-29

Copy start_x.elf and fixup_x.dat onto boot partition (e.g. what you see when plugging the card into Windows machine), renaming to overwrite the existing start.elf and fixup.dat.


RE: RPI1-512 Audio Dropout playing HD multichannel music - MrNice - 2015-03-29

Test done

From fresh image, update to OpenELEC Isengard build #0328
Changed start.elf and fixup.dat

Added to config.txt:
hdmi_mai_thresh=0x1412
Play in file mode, no browsing
1 drop (@~10 s) during 4 minutes
Then change to full screen and no browsing for 4 more minutes
No drop
http://xbmclogs.com/prw9vskls

See you tomorrow


RE: RPI1-512 Audio Dropout playing HD multichannel music - popcornmix - 2015-03-30

(2015-03-29, 17:15)popcornmix Wrote: It looks like setting buffermode=1 is fixing my issue, so I think the current issue I have is just down to the pretty high bitrate of the file (6Mbit/s), the limited buffering in paplayer and my not-great network (I'm going through a wireless bridge at the moment).

Any other way of increasing buffering in paplayer?

There are more users here who have buffering issues with paplayer that are fixed with buffermode=1.
One reports he has buffering with lossless music, but can play Blu-Ray without buffering (this is with a NUC using wifi). So it might be worth considering increasing the buffering paplayer has by default.


RE: RPI1-512 Audio Dropout playing HD multichannel music - fritsch - 2015-03-30

Can you try to read a multiply of PACKET_SIZE?


RE: RPI1-512 Audio Dropout playing HD multichannel music - popcornmix - 2015-03-30

I did try:
Code:
#define PACKET_SIZE (3840*10)    // audio packet size - we keep 1 in reserve for gapless playback
While it worked, it didn't fix the issue (in the way buffermode=1 did).


RE: RPI1-512 Audio Dropout playing HD multichannel music - fritsch - 2015-03-30

That really smells, that VFS is broken in a very nasty way.


RE: RPI1-512 Audio Dropout playing HD multichannel music - Claudio.Sjo - 2015-03-30

(2015-03-30, 15:36)fritsch Wrote: That really smells, that VFS is broken in a very nasty way.

What is VFS?


RE: RPI1-512 Audio Dropout playing HD multichannel music - FernetMenta - 2015-03-30

(2015-03-30, 15:33)popcornmix Wrote: I did try:
Code:
#define PACKET_SIZE (3840*10)    // audio packet size - we keep 1 in reserve for gapless playback
While it worked, it didn't fix the issue (in the way buffermode=1 did).

that only defines max packet size to be read. won't help here


RE: RPI1-512 Audio Dropout playing HD multichannel music - fritsch - 2015-03-30

It does, if vfs has an issue with returning / fetching small values ... and it seems it had an effect.


RE: RPI1-512 Audio Dropout playing HD multichannel music - popcornmix - 2015-03-30

(2015-03-30, 17:29)fritsch Wrote: It does, if vfs has an issue with returning / fetching small values ... and it seems it had an effect.

My comment was saying that increasing PACKET_SIZE didn't have any visible effect at all.
It didn't break anything, but it didn't fix the underflow issue (perhaps my comment was ambiguous).


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