[mythtv-users] Building a library.....chews up space!!

Tom Runner tomj.runner at gmail.com
Mon Mar 28 23:55:30 UTC 2011


> Encoding h264 from an already maximally compressed mpeg2 (US HD) source
> isn't going to give you equivalent quality going to the same
> bitrate/filesize as the original recording! Thankfully most broadcast is
> live encoded and has bit stuffing to make up bandwidth also multi audio
> tracks, subtitles and other data that can usually be discarded.
>
> I find that for mpeg2 HD broadcasts I can get equivalency at about 80% of
> the original recording size and acceptable to almost all at 50% size. For UK
> H264 HD recordings the size stays about the same, sometimes a little more.
>
> My setup box send 1080i signal, whatever the chanel (HD or SD). I transcode
to 720p the file generated by the HDPVR (SD chanel only). I get an
equivalency at 50% of the size.
Now, for sure the transcode takes forever, an average of 8-10 hours per
movie.
Reason for that, I do not have the space to put extra drives close to the
TV. NAS over a homeplug network is not very efficient.


> What is worth a go is pure remuxing, no image quality is lost, just those
> padding bytes, teletext, eit, subtitles and a lot of timing packets that are
> needed for live broadcast but not for file playback (if you stream they are
> re-created anyway), you can save 30% by remuxing to a simpler ts file or a
> little more if you go to mkv or mp4, no nuance of the video is lost as you
> never alter the encoded video.
>

Which tool are you using to do so. HDPVR generated files are not so much
welcomed by most software. But I'm curious to see whether I can gain
something by remuxing them.
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