[libav-bugs] [Bug 460] New: Generate movie from images with CORRECT length

bugzilla-daemon at aruru.libav.org bugzilla-daemon at aruru.libav.org
Mon Feb 25 04:40:07 CET 2013


           Summary: Generate movie from images with CORRECT length
           Product: Libav
           Version: git HEAD
          Platform: All
        OS/Version: Linux
            Status: NEW
          Severity: major
          Priority: Normal
         Component: general
        AssignedTo: bugzilla at libav.org
        ReportedBy: michael.heuberger at binarykitchen.com

Hello guys

>From a webcam I'm recording images at a frame rate of 10 (not 25!) into the
folder /tmp/test/input/. With this command I'd like to generate a movie:

avconv -f image2 -i /tmp/test/input/%d.jpg -an -b:v 256k -r 10 -y
/tmp/test/output/video.webm -loglevel info -c:v libvpx -crf 50 -deadline rt

Video video.webm is generated but the video speed is wrong (length is halved).
To be exact, when I have recorded an image sequence of 15 seconds at 10 fps,
then there are 15 x 10 = 150 images. And in theory the length of the movie
should be 15 seconds ...

But with the above avconv command I get a movie length of about 6 seconds. Why?

Any hints? Help is much appreciated.


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