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

[Michael T. Dean]

Stephen Boddy wrote:

>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.
>>    
>>
>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.
>  
>
http://www.gossamer-threads.com/lists/mythtv/users/141559#141559

Note the part that says:

For now, if all you want to do is save space, just transcode to mpeg4 
with mythtv (keep in mind, it's optimized for encoding speed, not 
quality) ...

Mike