Actually we can now already get "UMD quality" 30fps pmp without stuttering.jonny wrote:ok, welcome to the stuttering club :)
it's a normal behavior of the app. happen when the psp is not able to decode audio/video in realtime.
(the current resolution limit, to have smooth playback, is something slightly more than 480x272, so you must reencode the clip using a lower resolution)
i'll get more speed in the future (i hope :)
1.resize filter using AVS` BicubicResize(480,272,-0.8,0) -0.8 was good balance between aliasing and softness(It really looks like UMD`s ...)larger video size resized by PSP could not present sharper image than pre-bicubic-resized 480x272 video.
(if we want more precise result,the third parameter is depending on the resolution&sharpness of the source video)
2.use Xvid in vdm and uncheck B-VOPs, use DXN HT PAL profile,and motion search precision sets to 4.high。
So now it`s rather safe to set bitrate between 0 and 3200kbps.
（main drawback was obviously larger filesize for equal quality）
In fact,pmp mod 2.01 was better than UMD in special case(pure red object in black background).although UMD has a larger chroma infomation,but it just uses point sampling to upsample chroma,so it looks slightly a bit aliasing on red edge though downsized from 720x480 to 480x272（still better than pmp without interpolating chroma）
ps:little off topic.Using vrc_maxrate parameter in mencoder libavocodec mpeg4 leads to direct exit while vrc_minrate is OK.... Anybody know what`s wrong with it???It`s really a pity that libavocodec mpeg4 could not limit maximum bitrate that very high bitrates compel psp to stutter...
