Reinhard Walter Buchner wrote: > Hi Gr?goire, > >> 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. Hi, I think you all wrote about MPEG4 ASP. When talking about HDTV, we are talking about DVB-S2 (not receiveable with current cards) and MPEG4 AVC alias H.264 which is far better than MPEG4 ASP. I made some tests by deinterlacing and downscaling an Euro1080 sequence to 1280x720 (720p) as this is a resolution a PC running at 3 GHz is able to play without interruptions. At 4 MBit/s encoded with Nero Digital AVC, the image is amazing and far better than with DivX 5.x, WMV 9 and even better than DivX 6. IMHO, this time you can really say that you only need half the bitrate of MPEG-2. Read some more information on MPEG4 AVC (and a codec comparision) on Doom9.org (esp. the MPEG4 FAQ in the message board). Joerg
