[mythtv-users] How much space should transcoding HDTV to mpeg4 save?
ryan.goat at gmail.com
Thu Jan 18 19:47:30 UTC 2007
I'm experimenting with the transcoding my over the air HDTV recordings to
mpeg-4 to save hard drive space. I enabled transcoding but didn't change
any of the default bitrate values. I did enable the "scale bitrate
according to capture resolution" option. I am recording OTA HDTV with a
HDhomerun unit. Here are my results from the first show I transcoded:
Title: Racheal Ray
Original size: 6.8GB
Transcoded size: 6.3GB
Does this look like usual space savings from transcoding? Half a gig is a
lot, but honestly I was expecting more. It saved less then 7.5% of the
original file size. Basically if I transcode everything I can have 107
hours of recordings on a given hard drive size instead of 100 hours. I
think it would be better to save the cost of the electricity used to
transcode and buy a larger hard drive.
I didn't cut the commercials. I know that would have saved more space, but
I am not interested in archiving shows. I just watch once and then delete.
And I don't trust the commercial flagging enough to cut without manually
checking the cuts first.
Am I missing something? Do I need to adjust some bitrate settings to get
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