[mythtv-users] Share your transcode settings!
raymond at wagnerrp.com
Wed Jan 11 17:46:41 UTC 2012
On 1/11/2012 12:35, Jeremy Jones wrote:
> On Wed, Jan 11, 2012 at 11:24 AM, Raymond Wagner <raymond at wagnerrp.com
> <mailto:raymond at wagnerrp.com>> wrote:
> On 1/11/2012 12:16, Jeremy Jones wrote:
>> I really like the results obtained by running mythtranscode,
>> used in
>> fifodir mode into ffmpeg. You still get to cut adverts out, plus
>> you get full control of recompression. You can maintain
>> interlace, or
>> deinterlace and double the frame rate. My script is linked to
>> the mythtranscode wiki page:
>> May not do exactly what you want, but should be easy to alter.
>> Can you change from HD to SD and still keep the Mpeg-ts
>> container? Or does it have to go into a nuv?
> No and no. FIFO mode in mythtranscode opens a pair of named pipes
> on the filesystem, and feeds the raw audio and video streams into
> them. These pipes use the standard 64KB POSIX buffering, so as
> you pull data from them, mythtranscode pushes more data into them,
> in FIFO ordering. The video is clipped, deinterlaced, cropped,
> and filtered however you have configured, but it is not encoded
> nor is it multiplexed into any form of container. It is left up
> to you to do those things.
> I didn't realize how far over my head that post was until you
> explained what was going on. Thanks for making it simple with the
> transcode wrapper you wrote.
The transcode wrapper doesn't touch any of that stuff. All it does is
give filenames for the user-chosen command to read from and output to,
and then fix up the various details in the database to reference the new
file. What Paul Gardiner is using and what I described is called a
frameserver. It is intended to allow video processing to be pipelined
through multiple applications, without having to waste disk space and
disk IO on one or more intermediary files. Nuvexport uses this mode
internally, and a number of Windows tools such as MeGUI use AviSynth for
similar purposes, but it is beyond the scope of most tasks that just
wrap 'ffmpeg' or 'handbrakecli'.
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