[mythtv] [mythtv-users] video playback routing

Dan Littlejohn dan.littlejohn at gmail.com
Wed Mar 23 04:07:39 UTC 2016

On Mon, Mar 21, 2016 at 1:35 PM, Michael T. Dean <mtdean at thirdcontact.com>

> On 03/19/2016 03:46 PM, Dan Littlejohn wrote:
>> On Sat, Mar 19, 2016 at 1:26 PM, Michael T. Dean wrote:
>> On 03/18/2016 04:03 PM, Dan Littlejohn wrote:
>>> 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.
>>>> Is it an encrypted ISO?
>> Nope, they are not encrypted.
> I still wouldn't be surprised if it's the code that was added to allow
> streaming of DVDs/ISOs for Video Library--meaning that it always streams.
> If so, the code is broken in assuming that backend streaming is required
> for all ISOs and not even allowing the frontend to check to see if it has
> access before streaming. If that's the case, you are more than welcome to
> fix it.  It should work like playback of recordings and other videos--that
> the backend says where the file is located and the frontend checks in that
> location to see if it has local access and, if so, plays the file directly.
> This specific code was committed under a bad commit message saying that it
> allows playback of
> encrypted DVDs and ISOs from Storage Groups, when it actually simply
> allows streaming of DVDs and ISOs and has nothing to do with
> encryption***.  However, you can find the commit at:
> https://github.com/MythTV/mythtv/commit/1ff446ad093064ff3
> See also:
> https://code.mythtv.org/trac/ticket/11602
> Mike
> *** MythTV cannot play back encrypted DVDs.  MythTV uses libdvdnav to play
> back unencrypted DVDs.  However, libdvdnav happens to check to see if the
> user has installed libdvdcss on his system and, if so, uses it to decrypt
> encrypted DVDs before MythTV ever sees any of the DVD data, so a user who
> installs libdvdcss on his system is setting up the system so that MythTV
> never actually sees any encrypted DVD. And MythTV worked exactly the same
> way before and after this commit--the only thing the commit allowed was
> streaming DVDs/ISOs rather than requiring direct file system access to play
> them.
Thanks Mike.  Starting to take a look at it now although I will have to
learn my way around first.

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