The scenario is that, I have an .mpg video file. When I extract the I-Frames from this file by below command:
ffmpeg -i D:\test\1.mpg -vsync 0 -vf select="eq(pict_type\, PICT_TYPE_I)" d:\Test\IFrames\I-Frm-%03d.jpeg I will get 104 images which is about an I-Frame for every 12 frames of the 1.mpg stream. Then I tried to change the video format to MP4 by below command: ffmpeg -i D:\test\1.mpg -vcodec libx264 -g 0 d:\Test\11.mp4 and ffmpeg -i D:\test\1.mpg -vcodec libx264 -g 10 d:\Test\12.mp4 the question is that the new generated videos, 11.mp4 and 12.mp4, in spite of using different –g values , the I-Frames of these two video is same and just is 5 images. I extract them by below command: ffmpeg -i D:\test\11.mp4 -vsync 0 -vf select="eq(pict_type\, PICT_TYPE_I)" d:\Test\IFrames\I-Frm-%03d.jpeg I want to know why there is a big difference between the mpg and mp4 files and why in spite of different –g in last two video, I have exactly same I-Frames?
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