OMG, when i check the I-Frames by JM software, that software shows only 3 I-Frames. how this is possible? please help me to understand where is my problem?
On 17 May 2012 12:05, <[email protected]> wrote: > I am confusing guys, i encountered a new problem in regard with adaptive > and fixed rate I-Frames by ffmpeg under windows. it is as below: > first i convert the original video (mpeg1) to the pure h.264 format by > below command for adaptive I-Frame rate: > > ffmpeg -i C:\1.mpg -r 25 -an -vcodec libx264 -threads 0 -f h264 -r 25 -g > 0 C:\1adapt.264 (-g 0 for adaptive I-frame rate) > ffmpeg -i C:\1.mpg -r 25 -an -vcodec libx264 -threads 0 -f h264 -r 25 -g > 25 C:\1fixed.264 (-g 25 for fixed I-frame rate every 25 frame one i-frame) > > I dont involve you about my first problem which was related to the twice > tbr value in the h264 transformed videos and their shorter time length > (with twice faster speed) > > my current problem is that when i want to use select filter to extract the > i-frames from the above 264 videos, it is natural that i expect different > results and for a 50sec video with -g 25 and 25fps, i expected 50 i-frames > but the result was exactly same and just 5 frames for both videos. the > select filter which i used can be seen at below: > > ffmpeg -i C:\1adapt.264 -vsync 0 -vf select="eq(pict_type\, PICT_TYPE_I)" > C:\I-Frm1adapt-%03d.jpeg > ffmpeg -i C:\1fixed.264 -vsync 0 -vf select="eq(pict_type\, PICT_TYPE_I)" > C:\I-Frm1fixed-%03d.jpeg > > both produce 5 image for a originally 50 sec video with 25fps tbr 25 which > after transformed reduced to 25 sec with 25fps but tbr 50. Its strange , > isnt it? > > On 16 May 2012 18:48, Carl Eugen Hoyos <[email protected]> wrote: > >> Alex Cohn <alexcohn@...> writes: >> >> > If I understand correctly, Amir complains about the >> > encoder, not the decoder. >> >> Then your answer was clearly more helpful than mine! >> >> Carl Eugen >> >> _______________________________________________ >> 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/ > -- Amir H. Rouhi PhD Student/ CSIT RMIT University Room: 14-09-04 http://raws.adc.rmit.edu.au/~s3288736/blog2/
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