Why video cannot be fast forward/back rewind?

[wsgjj]

Hi, Everyone!

I want to know why the video only contain I-Frame cannot fast forward or back rewind on Mobile phone.but it is normal on PC. what different between PC and mobile phone on encode video?

Thanks a lot!
:thanks:

[setarip_old]

Hi!

Perhaps the two players have different capabilities...

[wsgjj]

Thanks for your reply.
Could you tell me a detail reason? Or can give me some study material about it. I am very want to know about it. thanks

[setarip_old]

Perform a Googlesearch for the specifications of your particular mobile phone...

[JohnnyMalaria]

If the phone uses Windows CE then it is probably using DirectShow just as on the PC. By default, DirectShow cannot "seek" MPEG files since there is no straightforward way to determine where to go to in the file to get to a particular frame. A DirectShow filter does exist that permits such seeking but it most likely doesn't exist for Windows CE and, if it did, you would have to deliberately install it. It doesn't matter that the video is I-frame only - the DirectShow filter responsible for reading MPEG frames cannot tell that the MPEG is I-frame only. It is up to the filter to tell DirectShow whether or not it can randomly seek frames in the file.

If your phone isn't Windows CE based then the above doesn't apply.

[wsgjj]

Hi,
Very appreciate you!
My mobile phone's platform is OSE(SonyEricsson). Thought i cannot sure which encoder be used on my phone. but your comments give me a train of thought.

Thanks a lot!

:thanks: