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| Setting the right resolution? http://forum.linhes.org/viewtopic.php?f=11&t=3295 |
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| Author: | siliconsurfer [ Fri Jan 21, 2005 5:41 am ] |
| Post subject: | Setting the right resolution? |
Hi, I was wondering if anyone could give me some advice. I'm trying to get a nice optimal setup. Is there anyway you can select the capture resolution? Is this the LiveTV profile? If so, what resolutions are other people in the UK using? I have mine set to the same as the screen resolution (640x480) As when I set the x server to 640x576 it won't work. Also I have my geforce setup, as two devcies in the XF86config, (one for the monitor and one for the TV) I was told this was preferable because you could gain some hardware enhanced performance on one of the screens. Is this true, and if so how to you select the screen to give the performance too? Finally I'm still trying to figure out the point of transcoding. Is the tv captured in mpeg2 format, and transcoding converts it to mpeg4 or rjpeg for compression reasons + obviously to edit out adverts and the like? Cheers -- Dave Athlon 2800+ 756MB 3200 DDR Geforce4 MX 128 TV Out Software V4L TV card SoundBlaster 5.1 |
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| Author: | Xsecrets [ Fri Jan 21, 2005 9:08 am ] |
| Post subject: | |
I use 640x480 the default is 480x480 and lots of people use 720x480. Personally I've used all of them and I can't tell a difference. The only real reason that I know of to use one over the other is 720x480 is a valid dvd resolution, but you are not using a pvr card so that is mostly irrelevant anyways. the resolution is set in the recording profiles. obviously the livetv profile is used for livetv the default profile will catch your recordings if you don't do change the profile when setting up the recording. Transcoding is done for two reasons 1) to save space when you have recorded using a hardware card or using RTJPEG 2) to edit out commercials As for the Gforce card. My suggestion is change the config file to only use TV and ditch the monitor, it will save you a ton of headaches. If you are determined to have both you'll just have to search for how to tell which one gets xv. It's been discussed many times, and I'm not really even sure you can force it. |
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| Author: | siliconsurfer [ Fri Jan 21, 2005 9:44 am ] |
| Post subject: | The Transcoding issue |
Cheers. Ok so one reason for transcoding is to save space, the other is to edit out commercials? Under transcoders I have two listed, Rjpeg, and Mpeg2. The problem I've found is that I record a program at 640x480 for 30min, this gave me a size of around 700MB. When I ran the transcoder to edit out the breaks, I found the size grew to 8Gigs! Am I doing something stupidly wrong? |
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| Author: | Xsecrets [ Fri Jan 21, 2005 9:48 am ] |
| Post subject: | |
you are transcoding to RTJPEG and not to MPEG4. |
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| Author: | siliconsurfer [ Sat Jan 22, 2005 5:36 pm ] |
| Post subject: | Ah ha |
Cheers, yeah I had search round the fourm and discovered that. For anyone else whos interested change the transcoders codec to mpeg4 and bobs your uncle. |
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| Author: | nigelpearson [ Sun Jan 23, 2005 11:31 pm ] |
| Post subject: | |
The maximum resolution for PAL (UK, Australia) is 768x576 (assuming you are using square pixels). In practice, this is too slow, so anything lower is good. Other sizes to try: 384x288 768x288 |
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