TMPGEnc settings for internet video

[KSK76]

hi,


i got a little problem. i want to convert a video with TMPGEnc so that i can upload it to a homepage. i just wana upload short samples of a movie. the quality should be either 192X144 or 352X288 (PAL); everythings works out fine so far. but if i change the rate control to a CBR of lets say 300kbps, the file still has the same size like before. i want a setting that lets me produce files taht have like 1.5 to 2 MB per minute.


can someone pleasehelp me??


thx,


ksk

[KSK76]

for example: i got a file that is97 seconds long; no matter what i try, the file size stays 16.155kb... i tried converting from uncompressed *.avi as well as from compressed. it must be possible to produce a file that is about 2.5MB. i know it's possible cause i made a file of 30 seconds which is 800kb. why won't tmpgenc let me change the file size no more? what am i doing wrong??


thx,


ksk

[KSK76]

ok, i found it out myself. thx.

[Arwen Goenitz]

Not many people know that MPEG1 is quite scalable.
If you have a very long GOP like 1 I frame, 1 B frame and 49 P frames then it will be IBPBPBPBPBPBPBPB...up to 100 frames.
The load sharing of each B gets passed to the next P so theres little dependancy.
B frames are bidirectional so you dont want them back to back as they will carry thier behaviour along the timeline, better to have a P remind them of what the last I looked like.
With a long GOP you must have a uniform Quantize Matrix...try filling every space on the grid with 8, ensuring not too much data is discarded.
160x120 @25fps is possible at bitrates of 64kbps and they still look good.

[Anonymous65]

Download the free copy of Windows Media Encoder, it is made for internet video at low bit rates, and will perform better than mpeg-1 at very low bit rates.