[mythtv-users] H264 conversion of interlaced MPEG2?

[Michael Stucky]

On Tue, May 12, 2015 at 2:10 PM, Michael Stucky <mike at stucky.us> wrote:

> On Tue, May 12, 2015 at 11:02 AM, Jay Foster <jayf0ster at roadrunner.com>
> wrote:
>
>>  On 5/11/2015 6:49 PM, Michael Stucky wrote:
>>
>>
>> On May 11, 2015 4:17 PM, "Jay Foster" <jayf0ster at roadrunner.com> wrote:
>> >
>> > On 5/11/2015 12:46 PM, Michael Stucky wrote:
>> >>
>> <deletia>
>> >> Sorry for the delay, it was a busy weekend+... I am not an ffmpeg
>> expert so all the syntax came either from the original shell script or
>> searches for a better way to deinterlace. But I have done some additional
>> searching and testing have updated my script on the wiki accordingly.
>> >>
>> >> "yadif=1" has become "yadif=0:-1:1" (mode 0 = one frame out for one
>> frame in, parity -1 = autodetect, and deint 1 = only deinterlace frames
>> marked as interlaced). "sws_flags spline" is removed (only applies when
>> scaling content?). "-r 60000/1001" is removed (this actually caused every
>> frame to be duplicated for interlaced content). "threads 0" is removed (the
>> h264 encoder uses all available threads by default). "-c:a copy" replaced
>> with "-strict -2" to use the internal AAC encoder.
>> >>
>> >> This works and produces good quality output for all my content, 1080i,
>> 720p, and 480i all OTA to HDHomerun tuners.
>> >>
>> >> Mike
>> >>
>> >>
>> >>
>> >
>> > I took a look at the script on the wiki and had a question.  Does this
>> break commercial skipping?  The script does not appear to reschedule a
>> commflag job after the transcoding.
>> > Jay
>> >
>> >
>>
>> The script was designed to prepare a recording for export to the Video
>> Library where it can be played by different players/devices (vlc, mplayer,
>> android, ios, etc.). As such commercial skipping wasn't a consideration.
>> The script will remove a cutlist if it exists (so
>> leaders/trailers/commercials should all be automatically removed before the
>> transcoding takes place).
>>
>> If it is helpful, please take the script and modify it to do what you
>> want it to and create a new wiki page for your script so we all can benefit
>> from it!
>>
>> Mike
>>
>>
>> _______________________________________________
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>> MythTV Forums: https://forum.mythtv.org
>>
>>  My thinking was that this script was meant as a user job to be run after
>> a TV recording is made to convert the MPEG2 recording to H.264 for the
>> purpose of viewing these recordings on a low powered device like an Android
>> tablet.  My concern here was that it would auto remove commercials based on
>> commflagging (not good, since the commflagging is not good enough to just
>> auto cut) or that it would not preserve the commflagging (so there would be
>> no commercial skipping watching the transcoded recording).  If this was not
>> the purpose of the script then never mind.
>>
>> How does one watch recordings on a tablet then?  I tried the android
>> Mythtv frontend and Mythtv viewer apps, but could not get them to play any
>> recordings.  I came to the conclusion that all recordings had to be
>> pre-transcoded first, which is what I thought this script was all about.
>>
>> Jay
>>
>>
> I guess I don't understand what you are trying to accomplish. I don't use
> commflagging for all of the reasons discussed in this forum many times
> before. Commflagging is completely disabled on my MythTV system. I manually
> edit my recordings (yes it is time consuming but at least I know everything
> is correctly flagged) which creates a "cutlist". My script does two
> separate things, first it uses "mythtranscode" to remove everything in the
> "cutlist". With all of the content that I don't want already removed
> (leaders/trailers/commercials/etc.) the script now uses "ffmpeg" to
> transcode what remains from "mpeg2" to "h264". The resulting video (it is
> technically no longer a MythTV recording) contains only the show/movie I
> want and it plays on all my devices and on all of my players (MythTV
> frontend, vlc, mplayer, android tablet, Amazon FireTV stick, etc.)
>
> Mike
>

I should have been more clear about how the "cutlist" is created. I use my
MythTV Frontend to manually edit my recordings which creates a "cutlist"...
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