[mythtv-users] video playback routing
Dan Littlejohn
dan.littlejohn at gmail.com
Fri Mar 18 20:03:53 UTC 2016
Let me make another attempt to explain, I think I have a pretty standard
setup
host1 - backend master and frontend
host2 - backend slave and frontend
playing dvd iso on host1 frontend and all boxes have the same nfs paths.
All boxes use the same user. Yes, the ISOs are stored in a local nfs
directory /myth/video/.
Looks like you are on to something with the file type, as ISOs look to be a
key with the problem. I checked the other video types and they play
locally with no network traffic. Only the ISOs do with the weird streaming
from the slave.
On Fri, Mar 18, 2016 at 2:48 PM, HP-mini <blm-ubunet at slingshot.co.nz> wrote:
> On Fri, 2016-03-18 at 12:14 -0500, Dan Littlejohn wrote:
> >
> >
> > On Fri, Mar 18, 2016 at 5:59 AM, Michael T. Dean
> > <mtdean at thirdcontact.com> wrote:
> > (fixed top posting)
> >
> >
> > On 03/17/2016 04:38 PM, Dan Littlejohn wrote:
> > On Thu, Mar 17, 2016 at 12:36 PM, Hika van den Hoven
> > wrote:
> >
> > Thursday, March 17, 2016, 6:09:37 PM, you
> > wrote:
> >
> > I have a two system setup with a
> > master and a frontend. The
> > frontend also has a slave backend that
> > does recording (as the
> > satellite box is where the frontend is
> > at). Both boxes have access to a
> > NAS nfs share.
> > Recently, I noticed that even though I
> > am playing a video on the
> > master it appears to be routed from
> > the frontend?
> > myth://Videos@host2/video.iso
> > Why is this and how can I have either
> > everything streamed from the
> > backend or played locally? There is
> > some shuddering and my guess is
> > it is due to all the traffic back and
> > forth (frontend is on a weak
> > wireless connection).
> > I guess because the slave did the recording,
> > so it is owned by the
> > slave.
> >
> > Exactly.
> >
> > A recording record contains the hostname.
> > Possibly if you
> > change this to the hostname of the master...
> > Of cause the path on both
> > machines should be the same. Also then playing
> > back on the slave would
> > then again create a similar situation.
> > Alternatively, you could try adding the path
> > on both machines to the
> > storage group. These records also contain a
> > hostname field. I hope
> > that it then first tries to find the file on
> > the requesting machine.
> > As I understand older version would catch it
> > automatically from the
> > nfs share, but no longer.
> > Hi Hika:
> >
> > This is what puzzles me. The master backend has the
> > storage group
> > definition and the frontend slave backend does not.
> >
> > Storage Group definitions are global. They are defined on the
> > master backend and apply to all hosts. However, if a host is
> > missing a directory that's listed in the SG definition, it is
> > ignored. Therefore, the most straightforward approach to
> > setting up SGs is to set the only on the master backend host
> > and define the directory list as the union of all directories
> > used on all hosts.
> >
> > If you "define" a Storage Group on a remote backend, you are
> > not actually defining it. You are simply overriding the
> > global/master-specified directory list associated with that
> > Storage Group for this remote host only. Doing so serves
> > almost no purpose whatsoever--unless for some reason
> > you /must/ have a directory on the remote host that has the
> > exact same path as one that's defined in the global definition
> > of the SG and need to exclude it from use on the remote host
> > (though, really, simply changing the path/name of the
> > directory on one host or the other such that only usable
> > directories are listed in the SG definition is a much
> > preferred approach).
> >
> > I just checked with
> > nload and it is clearly streaming from the frontend to
> > the master backend
> > (maybe both) and the frontend wireless connection
> > cannot keep up with the
> > network load.
> >
> > Note that mythfrontend will /always/ check to see if it has
> > local access to the file before playing the video. So, all
> > you need to do is make sure that the mythfrontend you're
> > wanting to use has "local" access to the file.
> >
> > Specifically, when you attempt to play a recording,
> > mythfrontend asks the recording host (the host that originally
> > recorded the show) where to find the file. Then, once the
> > recording host reports the location of the show, the frontend
> > checks to see if that location is readable through the "local"
> > file system--where "local" will include any NFS-/CIFS-mounted
> > file systems. If the specified location is not available to
> > the frontend (i.e. the directory name doesn't exist on the
> > frontend's file system or that directory name exists but
> > corresponds to a different file system--you've mounted some
> > other file system at the same-named location), then the
> > frontend will request the file from the recording host.
> >
> > So, as long as all your hosts use the exact same file system
> > layout for the recording directories, you will be able to play
> > the file on any frontend host "directly" from your NAS without
> > any backend involvement.
> >
> > If you'd like help figuring out exactly what's going on/how to
> > make it work, please post information on your SG definitions
> > (for all hosts) and information about all mount points on all
> > hosts (using something like df and mount). Or, if this
> > provides enough informaiton for you to reconfigure things
> > properly, then enjoy. :)
> >
> > Is this something that could be fixed? I have been
> > meaning for a while to
> > contribute to mythtv and would not mind fixing this if
> > someone can point me
> > to where in the code it would need to be adjusted.
> >
> >
> > You really only need to fix your configuration. There's no
> > need for any changes to MythTV code.
> >
> > Mike
> >
> >
> >
> >
> > There is some confusion here so let me clear it up.
> >
> >
> > First, what I am trying to play back is a dvd iso. It was not
> > recorded by any backend.
> >
> >
> > For the storage groups this is what I have in the databases. All
> > entries are being saved to the master.
> >
> >
> >
> > master
> > mysql> select * from storagegroup;
> > +----+-------------+----------+---------------------------------+
> > | id | groupname | hostname | dirname |
> > +----+-------------+----------+---------------------------------+
> > | 3 | Default | master | /myth/tv/ |
> > | 6 | Trailers | master | /myth/admin/video/trailers/ |
> > | 46 | Coverart | master | /myth/admin/video/coverart/ |
> > | 49 | Fanart | master | /myth/admin/video/fanart/ |
> > | 11 | Screenshots | master | /myth/admin/video/screenshots/ |
> > | 12 | Banners | master | /myth/admin/video/banners/ |
> > | 16 | LiveTV | master | /myth/tv/ |
> > | 17 | DB Backups | master | /myth/admin/backup/ |
> > | 18 | Videos | master | /myth/video/ |
> > | 50 | Coverart | slave | /myth/admin/video/coverart/ |
> > | 51 | Fanart | slave | /myth/admin/video/fanart/ |
> > +----+-------------+----------+---------------------------------+
> >
> >
> >
> > slave
> > mysql> select * from storagegroup;
> > Empty set (0.00 sec)
> >
> >
> > I deleted the entries for the slave in the master, but it still
> > streams from the slave when I play something on the master.
> >
> >
> > The nfs mounts on both boxes are identical
> >
> > master mythuser # df -h
> > Filesystem Size Used Avail Use% Mounted on
> > 192.168.0.3:/volume1/data 17T 9.3T 7.1T 57% /myth
> >
> > slave mythuser # df -h
> > Filesystem Size Used Avail Use% Mounted on
> > 192.168.0.3:/volume1/data 17T 9.3T 7.1T 57% /myth
> >
> >
> >
> > when I play using a frontend on the master it is streaming from the
> > slave box. Even with verbose this is the only clue of where it is
> > looking for the file, the actual path is not printed out.
> >
> > 2016-03-18 12:01:50.077491 I DVDRB: Opened DVD device at
> > myth://Videos@slave/video.iso
> >
> >
> >
> > So I am unsure what to change. If it is suppose to be looking for the
> > file locally and then using that path it is not working for some
> > reason. What suggestions next?
> >
> >
> > Dan
>
> I'm not even sure this could possibly work the way you explain it
> because I thought FE video path was private but if slave BE user is the
> same as FE user then it could read the folder..
> Each FE (in mythvideo FE setup) can have a local Video path..
> This path is not meant to intersect with SG paths (don't cross the
> streams).
> Is your video/ISO stored in the FE local video folder
> (like /home/mythtv/Videos) ?
>
> Is this a problem just with ISOs ? Do other videos play direct from NAS?
>
>
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