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Sur d’autres sites (7715)

  • Using ffmpeg alphamerge to mask two images before calculating similarity index [closed]

    12 août 2024, par user2814357

    I'm working on a script that removes duplicate frames from images stored on disk. I need to ignore certain irrelevant parts of the images.

    


    The following ffmpeg command line should work, but it returns the same SSIM statistics as without mask.

    


    ffmpeg -i 1.webp -i 2.webp -i mask.png -filter_complex \
"[0][2]alphamerge[img1]; \
 [1][2]alphamerge[img2]; \
 [img1]format=yuva420p[masked1]; \
 [img2]format=yuva420p[masked2]; \
 [masked1][masked2]ssim=stats_file=-" -f null -


    


    Example output :

    


    [Parsed_ssim_4 @ 0x7fb76b70ff00] SSIM Y:0.829392 (7.680003) U:0.987882 (19.165656) V:0.993201 (21.675403) All:0.883108 (9.322165)
[out#0/null @ 0x7fb76c604700] video:0KiB audio:0KiB subtitle:0KiB other streams:0KiB global headers:0KiB muxing overhead: unknown
frame=    1 fps=0.0 q=-0.0 Lsize=N/A time=00:00:00.04 bitrate=N/A speed=0.602x    



    


    Result is the same with ffmpeg -i 1.webp -i 2.webp  -lavfi ssim=stats_file=- -f null -.

    


    [Parsed_ssim_0 @ 0x7f9c0cf06d80] SSIM Y:0.829392 (7.680003) U:0.987882 (19.165656) V:0.993201 (21.675403) All:0.883108 (9.322165)
[out#0/null @ 0x7f9c0da08e80] video:0KiB audio:0KiB subtitle:0KiB other streams:0KiB global headers:0KiB muxing overhead: unknown


    


    This is weird because the masked output files look as expected if I output them with :

    


    ffmpeg -i 1.webp -i 2.webp -i mask.png -filter_complex \
"[0][2]alphamerge[img1]; \
 [1][2]alphamerge[img2]; \
 [img1]format=yuva420p[masked1]; \
 [img2]format=yuva420p[masked2]" \
-map "[masked1]" masked_1.webp \
-map "[masked2]" masked_2.webp


    


    Does anyone know what the right syntax would be for getting the SSIM values from a single command using a mask ?

    


    Side note : If I use -map "[masked1]" masked_1.jpg it outputs the original picture, not the masked one. Could there be a problem in the ffmpeg pipeline ?

    


    Thank you very much !

    


  • av_vdpau_get_profile : mask out H.264 intra profile flag

    4 mars 2014, par Rémi Denis-Courmont
    av_vdpau_get_profile : mask out H.264 intra profile flag

    Signed-off-by : Janne Grunau <janne-libav@jannau.net>
    • [DBH] libavcodec/vdpau.c

  • avcodec/ac3dec : Fix shift signedness in mask creation

    21 septembre 2018, par Michael Niedermayer
    avcodec/ac3dec : Fix shift signedness in mask creation

    Fixes : 9924/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_EAC3_fuzzer-5473421772193792
    
Fixes : left shift of 1 by 63 places cannot be represented in type 'long long'
    

    Found-by : continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
    
Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
    • [DH] libavcodec/ac3dec.c

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