Mailing List Archive: MythTV: Users

How to force a transcode?

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fedora at adslpipe

Apr 11, 2006, 12:47 PM

Post #1 of 14 (1772 views)
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How to force a transcode?

I've got myth up an running nicely, with twin DVB-T tuners, I'm not
transcoding to a lower quality immediately after recording, the
commercial detection jobs run ok, I can view and edit the cutlist, and I
can start the transcode jobto make the cuts take effect, so far so good.

Sometimes I decide I would like to hang onto a recording, so I cancel
the auto-expire, I assume there is some way to force a transcode to a
lower quality codec to save disk space, I've had a look in the wiki and
mailing list archives but no joy, I get the feeling this is to to with
RecordingGroups or PlaybackGroups but those concepts seem a little vague
within the frontend, have I messad an obvious way to do this?

Thanks ...

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Braindead at diablops

Apr 11, 2006, 12:55 PM

Post #2 of 14 (1725 views)
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Re: How to force a transcode? [In reply to]

On Tue, 11 Apr 2006 20:47:24 +0100
Andy Burns <fedora [at] adslpipe> wrote:

> I've got myth up an running nicely, with twin DVB-T tuners, I'm not
> transcoding to a lower quality immediately after recording, the
> commercial detection jobs run ok, I can view and edit the cutlist,
> and I can start the transcode jobto make the cuts take effect, so far
> so good.
>
> Sometimes I decide I would like to hang onto a recording, so I cancel
> the auto-expire, I assume there is some way to force a transcode to a
> lower quality codec to save disk space, I've had a look in the wiki
> and mailing list archives but no joy, I get the feeling this is to to
> with RecordingGroups or PlaybackGroups but those concepts seem a
> little vague within the frontend, have I messad an obvious way to do
> this?

If you play the recording and press the 'X' key (at least in the default keymappings), It'll queue up the recording for transcoding (pressing 'X' again will cancel it). I believe it uses the default transcoding profile, but not sure.

--
Time and tide wait for no man.
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fedora at adslpipe

Apr 11, 2006, 1:13 PM

Post #3 of 14 (1715 views)
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Re: How to force a transcode? [In reply to]

Braindead wrote:

> If you play the recording and press the 'X' key (at least in the default keymappings),

Oh yes, I know that pressing X forces a transcoding, I'm familiar with
doing that to "finalise" a cutlist.

> I believe it uses the default transcoding profile, but not sure.

It seems a little odd to have to change the default to low quality, just
to force one transcoding to that quality, I could easily forget to set
the default quality back to high again, is there no direct way to force
a one-off transcoding of to a specific quality?

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jeffsimpson at alum

Apr 11, 2006, 1:13 PM

Post #4 of 14 (1699 views)
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Re: How to force a transcode? [In reply to]

> If you play the recording and press the 'X' key (at least in the default keymappings), It'll queue up the recording for transcoding (pressing 'X' again will cancel it). I believe it uses the default transcoding profile, but not sure.

Also, I believe that you should be able to hit the RIght arrow (from
the recordings list) and select "start transcode" from the menu that
pops up.

- Jeff
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jeffsimpson at alum

Apr 11, 2006, 1:17 PM

Post #5 of 14 (1723 views)
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Re: How to force a transcode? [In reply to]

On 4/11/06, Andy Burns <fedora [at] adslpipe> wrote:
> Braindead wrote:
>
> > If you play the recording and press the 'X' key (at least in the default keymappings),
>
> Oh yes, I know that pressing X forces a transcoding, I'm familiar with
> doing that to "finalise" a cutlist.
>
> > I believe it uses the default transcoding profile, but not sure.
>
> It seems a little odd to have to change the default to low quality, just
> to force one transcoding to that quality, I could easily forget to set
> the default quality back to high again, is there no direct way to force
> a one-off transcoding of to a specific quality?

I think you can actually change the recording group of the recording,
so that when you transcode it it will use the transcode profile
associated with that group. Not sure how easy that is to do in
mythfrontend, but it should be possible (and may be a good idea to do
anyway, since it will help organize the recordings by file format)
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fedora at adslpipe

Apr 11, 2006, 2:18 PM

Post #6 of 14 (1731 views)
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Re: How to force a transcode? [In reply to]

Jeff Simpson wrote:

> Also, I believe that you should be able to hit the RIght arrow (from
> the recordings list) and select "start transcode" from the menu that
> pops up.

yes you can, I know that from that same screen I can move a recording
into a new or existing recordinggroup, but under setup/playback I can
only find quality settings for recordingprofiles not recordinggroups :-(

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jeffsimpson at alum

Apr 11, 2006, 2:25 PM

Post #7 of 14 (1717 views)
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Re: How to force a transcode? [In reply to]

> yes you can, I know that from that same screen I can move a recording
> into a new or existing recordinggroup, but under setup/playback I can
> only find quality settings for recordingprofiles not recordinggroups :-(

I'm not at my mythfrontend at the moment, but aren't the recording
quality and transcode quality settings different? It makes sense that
only recording groups can have quality settings for the record,
because you can't really re-record at a different size/bitrate just by
moving which group the recording is in.

I think the transcode quality options are by recording profiles, though, IIRC.

You may also want to try out a few and see how much difference there
really is between the different options. I think that
MPEG2->(MPEG4|RTJPEG) is the biggest jump, and telling it what quality
level to transcode at is a much smaller change.
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cpinkham at bc2va

Apr 11, 2006, 2:28 PM

Post #8 of 14 (1713 views)
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Re: How to force a transcode? [In reply to]

* On Tue Apr 11, 2006 at 09:13:30PM +0100, Andy Burns wrote:
> > I believe it uses the default transcoding profile, but not sure.
>
> It seems a little odd to have to change the default to low quality, just
> to force one transcoding to that quality, I could easily forget to set
> the default quality back to high again, is there no direct way to force
> a one-off transcoding of to a specific quality?

There is a patch in trac to allow choosing the transcoding profile when you
queue a transcode. I haven't had a chance to look over it yet, but odds are it
or a modification of it will go into SVN sometime soon.

--
Chris
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pgratz at gratz1

Apr 11, 2006, 2:31 PM

Post #9 of 14 (1710 views)
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Re: How to force a transcode? [In reply to]

On Tuesday 11 April 2006 02:55 pm, Braindead wrote:
> On Tue, 11 Apr 2006 20:47:24 +0100
> Andy Burns <fedora [at] adslpipe> wrote:
>
> > Sometimes I decide I would like to hang onto a recording, so I cancel
> > the auto-expire, I assume there is some way to force a transcode to a
> > lower quality codec to save disk space, I've had a look in the wiki
> > and mailing list archives but no joy, I get the feeling this is to to
> > with RecordingGroups or PlaybackGroups but those concepts seem a
> > little vague within the frontend, have I messad an obvious way to do
> > this?
>
> If you play the recording and press the 'X' key (at least in the
> default keymappings), It'll queue up the recording for transcoding
> (pressing 'X' again will cancel it). I believe it uses the default
> transcoding profile, but not sure.

(hijacking the current discussion :-) ) Does anyone know of a way to
automate this? Ideally I'd like to go through and select for
transcoding all episodes of certain programs in one swoop instead of
doing in episode by episode.

Niels at Dybdahl

Apr 11, 2006, 3:35 PM

Post #10 of 14 (1722 views)
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Re: How to force a transcode? [In reply to]

> (hijacking the current discussion :-) ) Does anyone know of a way to
> automate this? Ideally I'd like to go through and select for
> transcoding all episodes of certain programs in one swoop instead of
> doing in episode by episode.

You can set up one of the recording profiles to automatically
transcode. Theen select that recording profile for those programs.

Niels Dybdahl
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pgratz at gratz1

Apr 11, 2006, 5:08 PM

Post #11 of 14 (1710 views)
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Re: How to force a transcode? [In reply to]

On Tuesday 11 April 2006 05:35 pm, Niels Dybdahl wrote:
> > (hijacking the current discussion :-) ) Does anyone know of a way to
> > automate this? Ideally I'd like to go through and select for
> > transcoding all episodes of certain programs in one swoop instead of
> > doing in episode by episode.
>
> You can set up one of the recording profiles to automatically
> transcode. Theen select that recording profile for those programs.
>

Hmmm, but I didn't think that would do anything for programs that have
already been recorded (Basically I'm having a space crunch now and
want all my old mpeg2 files to be transcoded to mpeg4).
Paul

mtdean at thirdcontact

Apr 11, 2006, 5:20 PM

Post #12 of 14 (1711 views)
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Re: How to force a transcode? [In reply to]

On 04/11/2006 06:35 PM, Niels Dybdahl wrote:
>> (hijacking the current discussion :-) ) Does anyone know of a way to
>> automate this? Ideally I'd like to go through and select for
>> transcoding all episodes of certain programs in one swoop instead of
>> doing in episode by episode.
>>
> You can set up one of the recording profiles to automatically
> transcode. Theen select that recording profile for those programs.
>

Or, IIRC, you can select the program name (left column) in the Watch
Recordings screen and use the menu to add all episodes for that show to
the playList and then use the playlist menu to begin a transcode. Works
once, at least. (You won't want to re-transcode the second time.)

Mike
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fedora at adslpipe

Apr 12, 2006, 1:06 AM

Post #13 of 14 (1697 views)
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Re: How to force a transcode? [In reply to]

Chris Pinkham wrote:

> There is a patch in trac to allow choosing the transcoding profile when you
> queue a transcode. I haven't had a chance to look over it yet, but odds are it
> or a modification of it will go into SVN sometime soon.

thanks, I'm not running SVN version, but will consider doing so for some
of the upcoming 0.20 features ...

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mtdean at thirdcontact

Apr 12, 2006, 8:28 AM

Post #14 of 14 (1706 views)
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Re: How to force a transcode? [In reply to]

On 04/12/2006 04:06 AM, Andy Burns wrote:
> Chris Pinkham wrote:
>> There is a patch in trac to allow choosing the transcoding profile when you
>> queue a transcode. I haven't had a chance to look over it yet, but odds are it
>> or a modification of it will go into SVN sometime soon.
>>
> thanks, I'm not running SVN version, but will consider doing so for some
> of the upcoming 0.20 features ...

BTW, Chris committed it today (
http://www.gossamer-threads.com/lists/mythtv/commits/197001#197001 ).

Mike
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