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  • FFmpeg encode an applied filter frame

    10 août 2017, par tqn

    I’m coding an app that crop video to square. I use native lib from ffmpeg like libavfilter, libavformat, ... After apply a filter, my video is cropped to correct size, but when encode and write to output, it seem like it cropped and zoom out everything. Here are the first frame that I extracted to jpeg to debug.

    Original Frame

    Original Frame

    Cropped Frame

    Cropped Frame

    enter image description here

    Encoded cropped Frame

    I tried both crop function like av_buffersink_get_frame(buffersink_ctx, pFrameSquare) and av_picture_crop((AVPicture *) pFrameSquare, (AVPicture *) pFrame, pic_format, 0, 0) but the output are the same. So what happened ?

  • avcodec/dvbsubdec : Avoid re-computing clut

    4 novembre 2017, par Michael Niedermayer
    avcodec/dvbsubdec : Avoid re-computing clut

    Fixes : Timeout
    
Fixes : 3218/clusterfuzz-testcase-5390672154591232
    

    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/dvbsubdec.c

  • ffmpeg : video + scalled watermark with multiply filter applied

    5 novembre 2018, par PawelN

    after a night of trying different options with applying my watermark on a video, I gave up :).
    What I tried to do is :

    • scale video to desired size (i.e. scale=640x480)
    • add watermark on its top left corner (10:10)
    • marge video with watermark with blend=all_mode='multiply'

    I’ve tried many options and that one I think is almost correct :

    fmpeg -i "${2}${3}" -i ${WMARK} -r 20 -y \
    
             -filter_complex "[0:0]scale=${6}x${7}, setsar=sar=1[a];[a][1:0] overlay=0:0[b];[a][b]blend=all_mode='multiply'"  \
    
            -an -c:v libx264 -crf "${8}" -preset "${9}" -tune "${10}" \
    
            -profile:v high -level 4.0 -movflags +faststart \
    
            "${4}${5}";

    but anyway I am getting errors.

    The nearest what I am looking for is :

    ffmpeg -i "${2}${3}" -i ${WMARK} -r 20 -y \
    
             -filter_complex "[0:v] scale=${6}:${7}[vi];[1:v][vi]scale2ref=(1510/408)*ih/3/sar:ih/3[wm][base];[base][wm]overlay=10:10"  \
    
             -pix_fmt yuv420p \
    
            -an -c:v libx264 -crf "${8}" -preset "${9}" -tune "${10}" \
    
            -profile:v high -level 4.0 -movflags +faststart \
    
            "${4}${5}";
    • Video is scaled to desired resolution ($[6 :$7)
    • watermark is scalled as well
    • ... but I dunno how add blend=all_mode=’multiply’ to it.

    Any ideas guys ?

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