mplayer not seeking properly on short videos

BrianK · 07-01-2008, 09:07 PM

I have a short video - 4.1 seconds long (100 frames @ 24 fps).

I'm trying to extract an image from it using mplayer. I can do this as long as I'm only looking to extract the first frame(s), but when I try to specify a seek location, it's not seeking.

I'm trying to do something like:

Code:

mplayer -ss 00:00:01 some_vid.mp4 -frames 2 -nosound -vo jpeg:outdir=./thumbs

again, this works, but only grabs the first frame rather than the 24th and 25th frame.

Has anyone experienced this? Is there a work around?

I know I could do the whole clip then grab the frame I need, but that takes too long.

emi_ramo · 07-02-2008, 05:25 AM

Have you tried to add "-idx" to the command? It will create properly the index, normally not created on avi files:

Code:

mplayer -idx -ss 00:00:01 some_vid.mp4 -frames 2 -nosound -vo jpeg:outdir=./thumbs

BrianK · 07-02-2008, 01:54 PM

Quote:

Originally Posted by emi_ramo

Have you tried to add "-idx" to the command? It will create properly the index, normally not created on avi files:

Code:

mplayer -idx -ss 00:00:01 some_vid.mp4 -frames 2 -nosound -vo jpeg:outdir=./thumbs

Unfortunately, that doesn't work - at least not on these mp4s I've been testing. I also tried -forceidx (after seeing your suggestion)

If you're interested, here's the video I've been testing:

http://hero.com/~briank/misc/master_12.nz2.mp4

emi_ramo · 07-03-2008, 09:04 AM

I've been probing and I couldn't make it work. I also probed to recode the video to another codec before picking up the images, and nothing. It's like -ss option's not at all accepted by mplayer/mencoder. May be you want to fill up a bugreport through http://www.mplayerhq.hu/DOCS/HTML/en...ts_report.html ...