[mythtv-users] Transcoding, mpeg-2, mpeg-4 ASP vs. AVC

[Stephen Boddy]

On Saturday 22 October 2005 04:33, Phill Edwards wrote:
> I'm recording with DVB-T cards (therefore MPEG2) and transcode to
> MPEG4 with great results.
>
> My transcode settings are:
> Video - Bitrate:2500, Max Quality:2, Min Quality:15, Max Quality diff
> bt frames:3, none of the other checkboxes ticked.
> Sound - MP3, Samplg Rate:32000, MP3 Quality:5.
>
> I think this is reducing the files to about 60% of the MPEG2 size.

Phil,

Well, I tried your settings. I did see a reduction in file size, which is 
strange as you use a bigger bitrate than I did. (2500 vs. 2200). I turned off 
the other settings including the "Scale bitrate for frame size". I still 
think I'm losing quality that I'd expect the more advanced codec to retain.

Are you scaling the video? And also, do you use playback filters of some form?

Just in case it makes a difference, I've got a very large screen, so I really 
notice artefacts.
-- 
Steve Boddy