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5th March 2012, 12:02 | #1 | Link |
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Join Date: Feb 2012
Posts: 3
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Opening mp4 videos with different Frame Rate for Quality Comparison
Hello,
Sorry if i have raised the topic which already exists..I have checked the forum - but have not found the answer. The question is the following: I have the MSU VQMT tool which compares the quality of the original and the optimized videos by checking the same frames of each video. And i am faced with the problem of comparison mp4 videos with Variable Frame Rate and Constant Frame Rate. I use the Avisynth script to open mp4 and i can see that program compares the wrong frames: frame of original videos with frame of optimized video, but several seconds later or prior. Therefore i get the wrong results of tool. So the question is: How to open the Original and Optimized variants of MP4 videos with Avisynth script to compare exactly the right frames? The following cases could be: 1) The VFR mp4 is optimized to the VFR mp4 2) The CFR mp4 is optimized to the CFR mp4 3) The VFR mp4 is optimized to the CFR mp4 I assume that for the 1st case files should be opened in the following way: clip = DirectShowSource("D:\Qualitytest\Test\orig\00001-LUjn3RpkcKY.mp4", converfps=true) return clip But original and optimized frames are very shifted. For the second case: clip = DirectShowSource("D:\Qualitytest\Test\orig\video.mp4") framePerSecond=clip.FrameRate clip1 = DirectShowSource("D:\Qualitytest\Test\optimized\video.mp4",fps = framePerSecond) return clip1 The original and optimized frames are almost the same, but not exacly For the 3rd case i even do not know what to do.. PS: I do not know in which way videos have been optimized. But need to compare the right frames and get the results.. Does anybody have any suggestions? |
Tags |
cfr, mp4, quality, vfr |
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