<br><div><span class="gmail_quote"></span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">On 11/26/06, Michael Tiller <<a href="mailto:michael.tiller@gmail.com">
michael.tiller@gmail.com</a>> wrote:<br>> I've never used transcoding in MythTV (automatic or otherwise) but because I<br>> recently got an HDHomerun I am now dealing with two issues that, it would<br>> seem, would benefit from transcoding.
<br>><br>> The first is that I can now get HD. For the time being, I cannot view HD<br>> (still working on XvMC, etc but no joy so far). What I'd like to do in the<br>> meantime is trancode things down. I thought this would be simple. Just
<br>> setup a transcoding profile (I used the High Quality one) to transcode to<br>> 720x480. I used a bit rate around 3800 and left pretty much everything else<br>> the same. I used this to transcode an HD program. The results were
<br>> terrible. First, the file size went from 7Gb to 6.6Gb. This despite the<br>> fact that I was transcoding from MPEG2 to MPEG4?!? The picture quality was<br>> pretty bad (in spite of this) and, finally, the playback was jerky. This
<br>> seems like such a straightforward thing, how did I screw it up?<br>><br>> The second is that I can now get SD broadcasts as well. However the audio<br>> is AC3. Unfortunately my MediaMVPs can't play this (even though mvpmc says
<br>> it supports AC3). So I thought I would simply do some kind of MPEG2->MPEG2<br>> transcoding switching the audio to MP3. But this doesn't seem to be an<br>> option. If I want to transcode it seems like I can only trancode to MPEG4
<br>> or RTJpeg (?). But those won't play on the Media MVP. Am I correct in<br>> saying that there is no support for MPEG2->MPEG2 trancoding? I could swear<br>> I've seen people talk about that before?!? Ideally I'd like lossless video
<br>> trancode ( i.e. strictly AC3->MP3 transcoding).<br>><br>> Oh yes, and lastly I would like to try and save space by transcoding some of<br>> the movies I have down in MPEG2 to MPEG4. I've tried this with mixed
<br>> results. Often the transcoding bombs out with an error status of 0 (is that<br>> an error status?!?) or 255. Where do I look to find out more details about<br>> why the failure occurred? Also, while successful commercial flaggings
<br>> appear in the jobs queue window in MythWeb, it doesn't show successful<br>> transcodings (only unsuccessful ones) which makes me a big nervous.<br>><br>> Any pointers would be very much appreciated. Thanks.
<br>><br><br></blockquote></div><br><br>I just tonight found a post with a link to some hd transcoding tips. they might be useful:<br><a href="http://www.myhdbox.com/mythtips/">http://www.myhdbox.com/mythtips/</a><br>
<br>i haven't tried these exact profiles yet, but they're pretty close to what i've had been doing to play back transcoded HD on an xbox frontend. i was doing essentially the 'resize med' profiles and using mp3 for the audio. i use an identical profile for SD transcoding with an exception of changing the resolution to 512x384.
<br><br>good luck.<br>JS<br>