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diff --git a/TOOLS/README b/TOOLS/README index aa10e2f522..b4813b13f4 100644 --- a/TOOLS/README +++ b/TOOLS/README @@ -254,6 +254,51 @@ Note: Requires gnuplot. Comparison is based on file2. Comparison assumes that the frame numbers of both files fit. +psnr-video.sh + +Author: Matthias Wieser + +Description: Calculates the PSNR between two existing video files. + The PSNR is calculated frame by frame. + Prints also the overall PSNR. + The script can be used to: + * compare different softwarescalers (should I use + -sws 1 or -sws 2) ? + * compare different resolutions (is it better to scale + down to 640x360 or to 560x320) + * compare different deinterlacers + * compare different video codecs + * compare video filters (is it better to use -vf hqdn3d + or lavcopts:nr=400) + * [...] + +Usage: psnr-video.sh <file1> <file2> [<frames>] [<options1>] [<options2>] + + <file1> and <file2> are the video files for which the PSNR + should be calculated. + [<frames>] is the number of frames to process, starting + from frame 1. + [<options1>] are additional MPlayer options for <file1> + [<options2>] are additional MPlayer options for <file2> + + A file called psnr.dat will be created with the following + content: + + File;Y;Cb;Cr + 00000001.ppm;34.23;39.54;40.06;35.426 + 00000002.ppm;33.03;38.71;39.26;34.271 + 00000003.ppm;33.45;38.91;39.28;34.655 + 00000004.ppm;32.72;38.69;38.85;33.972 + [...] + 00000247.ppm;35.55;40.84;42.15;36.785 + PSNR:;35.9887 + +Note: This script relies on the the tool "pnmpsnr" for the + frame-by-frame PSNR calculation. + Be aware that psnr-video.sh needs a lot of temporal space + inside /temp/. + + asfinfo Author: Arpi |