Hi Grégoire,
just done a small try to convert an Euro1080 FTA preview to mpeg4, with a bitrate of 2500 with mencoder : quality was very bad...
Anyone already converted (and keeping the resolution) HDTV with a perfect quality to mpeg4 ?
ROFL (sorry!). MPEG4 compression already sucks on normal TV. Doing that to a HDTV resolution should be outlawed ;o)))
Please don't misunderstand, but re-compressing (mpeg4) something that is already compressed (mpeg2) is ALWAYS going to give you miserable results. Doing the same to a high resolution picture is only going to make things worse.
A bitrate of 2500 isn't enough for standard quality TV. You'll need at least 3-5x that rate if you want to see the advantages of HDTV.
At the current stage of development, I never understood why mpeg4 is still around. CDs and DVDs are so cheap nowadays, there is no reason to give up quality for size.
Regards, Reinhard