[mythtv-users] Question on recording sizes and DVD burning

[Joseph DeGraw]

On 01/21/2014 09:56 AM, John Pilkington wrote:
> On 21/01/14 14:27, Joseph DeGraw wrote:
>> On 01/21/2014 09:08 AM, Joseph DeGraw wrote:
>>> A while ago I upgraded my hardware to include HD recording with a ceton
>>> card and its been great. However, My girlfriend wants to burn some of
>>> her shows to DVD that are 2 hours long. However the size of the files
>>> are like 10 gigs. In mytharchive they can come down to just over 5
>>> gigs.
>>> The shows are 1920x? HD from comcast provider. I was thinking that
>>> reducing them to 720i would be fine to make them smaller to fit on DVD.
>>> This brings up transcoding (which Im looking into right now) and
>>> profiles.
>>>
>>> How do you handle this?
>>>
>>> jdegraw
>
>>>
>> Ok, I have gone into the menu in mytharchive after reading an older
>> thread and selected a recording profile. I guess my only question is :
>> What do the different profiles mean?
>>
>> HQ, EP, LP, SD
>>
>> I know if I select a SD setting it will not finish and stalls out. I
>> dont even get an error message. Therefore, Iam trying the LP one for a
>> single sided DVD for a 10 gig, 2 hour Lifetime Network movie.
>>
>> MythTV .27 / Mythbuntu 12.04 based
>>
>
> With much of the USA now apparently HD only this is clearly getting to
> be a common problem, and at present I don't think MythArchive handles
> it well.  The encoder options are defined here: (Fedora build)
>
> /usr/share/mythtv/mytharchive/encoder_profiles/ffmpeg_dvd_ntsc.xml
>
> and are used within /usr/share/mythtv/mytharchive/scripts/mythburn.py
>
> I suspect that the best option would be two-pass specifying the
> required file size; a fairly minor edit of the HQ option, probably,
> but requiring some research in the ffmpeg documentation or code.
>
> As far as I can see the -b:v value doesn't do much.  The pal-dvd
> profile, which I use, seems to focus on a q value of 2 as its guiding
> light.  That isn't specified in the file above.
>
> If at present you are getting a 5 GB file the m2vrequantiser option
> within MythArchive will shrink that quickly with a quality that should
> be acceptable, but I wouldn't like to rely on it for much higher ratios.
>
> HTH
>
> John P
>
>
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Thank you John,

So, It seems that SP is the profile to use on these large HD recordings.
Iam having a problem that it seems to take a rather long time to run
mytharchive and it seems to be stuck at this point:

*mythffmpeg -threads 6 -v 1 -i
"/var/lib/mytharchive/temp/work/1/newfile.mpg" -r ntsc -target ntsc-dvd
-b:v 4771k -s 720x480 -acodec copy -copyts -aspect 16:9
"/var/lib/mytharchive/temp/work/1/newfile2.mpg" -map 0:0 -map 0:1 *

I see that mythmmpeg is still running and taking up ALOT of CPU time.
Using 'Top' it shows approximately 200 in cpu usage. Seems to just sit
there for hours. Is this normal? I dont have any error messages in any
of the logs - mythburn.log, progress.log, kern.log.

What does show in 'top' is that mythmmpeg is still running and sometimes
will spawn another mythmmpeg process.

jdegraw




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