[mythtv-users] LiveTV Stutters - Recordings are Perfect
siliconfiend at gmail.com
Mon Jun 11 20:50:51 UTC 2012
On Mon, Jun 11, 2012 at 12:54 PM, David Hofstra <dave at dhofstra.com> wrote:
> I'm a long-time MythTV user, but I've only ever used Myth to watch
> recordings (not to watch live-tv). I've always used my DirecTV box for
> LiveTV as it was easier for the WAF.
> I recently purchased a HDHomerun Prime, and switched from DirecTV to
> Xfinity. I found that the Xfinity box on-screen guide is unbearable to
> watch LiveTV... ughh So, I'm trying to use MythTV to watch LiveTV and ditch
> the Xfinity box altogether.
> Problem: Recordings playback wonderfully 100% on my frontend (and have for
> years). LiveTV stutters about 10 times per hour, and about once per day it
> fails. It almost always stutters a few seconds after the channel change,
> which I hear is to be expected, but then it continues to stutter every so
> many minutes.
> A) When LiveTV fails, it fails with 'video buffering failed too many times'
> B) When LiveTV stutters, I see a bunch of the following in the frontend
> terminal (infact, I see this when it doesn't stutter also)
> -RingBuf(<filename>): Waited 0.2 seconds for data to become
> available... 15720 < 32768
> -RingBuf(<filename>): Taking too long to be allowed to read..
> I have a Geforce 210 @1024MB running 295.40 and it is using VDPAU normal
> settings on mythbuntu (OS 12.04)
> Here's what I have tried so far:
> 1) Replaced network cables to HDHomerun Prime as well as to the frontend.
> 2) Replaced the hard-drive in the frontend.
> 3) Moved the LiveTV recording group directory to a faster RAID5 drive set
> on the backend (previously on home directory)
> 4) Stopped upmixing stereo to 5.1
> 5) I tried both streaming using the myth:// protocol, and also having the
> liveTV directory on the NFS share directly.
> 6) I tried using every window manager known to man
> 7) Upgraded to the newest 0.25 mythtv-fixes, which updates to a new version
> virtually every day
> 8) I have one other frontend with a Geforce 6150, and while it doesn't seem
> to stutter, the HDTV tearing is so horrible, I cannot really tell if this
> box has the same problem or not.
> 9) I've increased the HD ringbuffer size in the backend-setup
> 10) Some folks note that if you pause LiveTV for a few seconds, then the
> stuttering stops. This also seems to work for me, but I hate to have to
> pause LiveTV every time I change the channel.
> Does anyone have any other thoughts, or notice something I have not tried
> after looking the above over? Why/How could Recordings be so perfect, and
> LiveTV be so horrible???? Any suggestions appreciated.
What about Playback -> Extra Audio Buffering? I had similar symptoms
(although much more frequent than 10 times per hour) and this setting
smoothed out Live TV for me with VAAPI on Intel.
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