[mythtv-users] Transcoding profiles
lists at glidos.net
Thu May 26 10:00:16 UTC 2011
On 26/05/2011 10:46, Dave Sp wrote:
> On Sun, May 22, 2011 at 6:43 PM, Raymond Wagner <raymond at wagnerrp.com
> <mailto:raymond at wagnerrp.com>> wrote:
> On 5/22/2011 18:36, Dave Sp wrote:
>> On Fri, May 20, 2011 at 3:05 AM, Paul Gardiner <lists at glidos.net
>> <mailto:lists at glidos.net>> wrote:
>> On 19/05/2011 17:12, Raymond Wagner wrote:
>> > Not directly, no. However you can get mythtranscode to act
>> as a raw
>> > frame server to another application that can. See nuvexport
>> for an
>> > example on how to do this.
>> If someone has figured out how to drive HandBrake like that,
>> can they
>> please post how it's done?
>> With SD, I used to use lossless transcode to cut adverts and then
>> archive with HandBrake, but now most of my content is HD, I've
>> more or less given up.
>> For my HD recordings, I use mythtranscode with the --mpeg2 and
>> --honorcutlist options to create a new file, then send that to
>> HandBrakeCLI with "--preset Normal" to create the final video.
>> For me, Handbrake's output file is around 1/10th the size of its
>> input file.
> That doesn't sound right. By clipping commercials, you're going to
> chop off maybe 35% of a recording. MPEG2 to H264 is going to get
> you another 2-3x. I could see 1/5th the original recording, but not
> 1/10th unless you're downscaling the video.
> I'll use last Sunday's Family Guy (hour long) as an example.
> Original recording:
> 1 hour, 3 minutes. MPEG-2 (TS). 1280x720. 15.5Mbps bitrate. 6.9GB
> file size.
> Hand-cut commercials. After mythtranscode with --mpeg2 and
> --honorcutlist options:
> 43 min, 30 sec. MPEG-2 (PS). 1280x720. 15.5Mbps bitrate. 4.8GB file
> After HandBrakeCLI with "--preset Normal":
> 43 min, 30 sec. MPEG-4. 1280x720. Variable bitrate (overall
> 2.6Kbps). 797MB file size.
> The resulting file size is 12% of the original before transcode. And
> the final video doesn't have any artifacts that I can see.
I've seen similar stunning results from Handbrake, but the problem is
to find a procedure like that when the starting point is H264,
without an intermediate step throwing away some of the quality and
without creating huge temporary files.
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