Oh, Thanks Alex, In the FFMPEG DOCUMENTATION says the format of usage should be: ‘-force_key_frames[:stream_specifier] time[,time...] (*output,per-stream*) so for example i should write: ffmpeg -f image2 -r 0.1 -i C:\test%1d.bmp -an -vcodec libx264 -threads 0 -f h264 -r 0.5 -force_key_frames time[0,5,10,15,20] -s 360x240 C:\5frameTest.264 Is that correct? BTW, if the time stamps are long , i.e every 5 second from start of the video, is there any other simplified form to use in time stamp? and would you please let me know whats the difference of -force_key_frames time and -g ?
Thanks Amir On 24 May 2012 16:24, Alex Cohn <[email protected]> wrote: > On Thu, May 24, 2012 at 4:28 AM, <[email protected]> wrote: > > I use the below command for making video out of 5 different bmp images: > > > > ffmpeg -f image2 -r 0.1 -i C:\test%1d.bmp -an -vcodec libx264 -threads 0 > -f > > h264 -r 0.5 -force_key_frames 0.1 -s 360x240 C:\5frameTest.264 > > -force_key_frames expects a comma separated list of timestamps, not a > "step" or something > > BR, > Alex > > > I used -force_key_frames instead if -g to inforce the ffmpeg to > generate > > i-frames. BTW with -g i did not get even the correct video. > > The generated video shows the images but not in same interval distance > but > > shows all 5 images in the video. > > > > then i use JM decoder and tried to get the frames with s-type=2 nad the > > result was just 3 , not 5. > > Question is why 5 i-frame in ffmpeg can not be detected in JM? > > > > On 22 May 2012 20:02, Alex Cohn <[email protected]> wrote: > >> > >> On Tue, May 22, 2012 at 11:47 AM, <[email protected]> wrote: > >> > > >> > I have noticed that the I-Frames in a pure h264 video created by > ffmpeg > >> > is > >> > not same as what JM detect as I-Frame in the same video. > >> > In JM software s_type=2 means I_Frame. the number of s_types frames > are > >> > always lower than what ffmpeg shows. > >> > What is your advice? > >> > Amir > >> > >> Would you like to upload an example? > >> > >> Alex > > -- > > Amir H. Rouhi > > PhD Student/ CSIT RMIT University > > Room: 14-09-04 > > http://raws.adc.rmit.edu.au/~s3288736/blog2/ > _______________________________________________ > Libav-user mailing list > [email protected] > http://ffmpeg.org/mailman/listinfo/libav-user > -- Amir H. Rouhi PhD Student/ CSIT RMIT University Room: 14-09-04 http://raws.adc.rmit.edu.au/~s3288736/blog2/
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