Hi, I downloaded an xvid codec and converted an mpeg into an xvid file. I have a portable MP4 player, which plays AVI xVid files only. But it is unable to play the converted file and simply gives the message "file not supported". The player came with other xvid files already on there, and apart from the data rate, they are alsmost identical in properties as with the one I produced by converting the mpeg. Does anyone know why it won't play? Could it be due to the data rate? If that is a problem, then how do I lower the data rate when I convert file? Could it also be that the codec I have downloaded on my system is newer than the codec the MP4 player is using? Would that cause a problem? If not, do you have any other suggestions as to why it can't play the xvid file? Thanks for any assistance, I know very little about this subject so all help is appreciated!
Please don't describe it as an mp4 player if it doesn't support mp4. XviD or other MPEG-4 in avi is not mp4. How did you compare the files? Did you compare the resultions, features used like bframes or qpel? Frame rates? etc.
Hi, Thanks for your response. I compared using frame rate, data rate, video sample size, and the width and height of the image. The video that came with the player and that works is 12 frames per second, 25kbps data rate, 24 bit video sample size, and is 268 x 220 pixels. The video that doesn't work is 12 frames per second, data rate 140 kbps, 16 bit sample size, and 268 x 220 pixels. Could it be the data rate that's the problem?
Well 140 is almost six times the data rate. The sample size by the way is more to do with how it was encoded. XviD always uses YV12 and if the encoder is fed YV12 it should list 12bit as the sample size. If you feed the encoder YUY2; 16bit and RGB24; 24bit. So you made sure that you didn't use bframes or anything else that wasn't used in the other file?
Hi, I'm not too sure what bframes are. I'm very new to this. I'm not sure what was used in the other file that works as it came as a sample file already on the portable player. I used some software called Ultra MPEG converter to convert the MPEG into the xvid. It could have used bframes but I really wouldn't know. I've used GSpot to compare the two, but its all too technical for me and I really don't understand what GSpot is showing. The only bit I do get is that it says they are both encoded as xvid's. Is there any way to check whether bframes were used using GSpot? Also, could it be that the high data rate of the file I converted is too much for the portable player to cope with? Is it possible to reduce the data rate?
GSpot will tell you if a file uses bframes, qpel or GMC. My guess is that the same file is SP and therefor uses none of them. XviD VfW has b frames enabled by default. Set a lower bitrate and you will get a lower data rate.
Hi, Thanks again for your response. Do you know of any software which will convert into xvid without using bframes, qpel or GMC, and where you can lower the bitrate? The software I have does not have any settings like those which you can change.
The settings are in the VfW codec config, assuming that the app encodes via VfW. Some apps also direct change options via registry settings though.
