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• avfilter/formats : Make ff_formats_pixdesc_filter return AVFilterFormats*

  26 septembre 2021, par Andreas Rheinhardt

  avfilter/formats : Make ff_formats_pixdesc_filter return AVFilterFormats*
  Up until now, it has returned the AVFilterFormats list via
  
  an AVFilterFormats** parameter ; the actual return value was an int
  
  that was always AVERROR(ENOMEM) on error. The AVFilterFormats**
  
  argument was a pure output parameter which was only documented
  
  by naming the parameter rfmts. Yet nevertheless all callers
  
  initialized the underlying AVFilterFormats* to NULL.
  This commit changes this to return a pointer to AVFilterFormats
  
  directly. This is more in line with the API in general, as it
  
  allows to avoid checks for intermediate values.
  Reviewed-by : Nicolas George <george@nsup.org>
  
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavfilter/formats.c
  • [DH] libavfilter/formats.h
  • [DH] libavfilter/vf_copy.c
  • [DH] libavfilter/vf_crop.c
  • [DH] libavfilter/vf_detelecine.c
  • [DH] libavfilter/vf_fieldhint.c
  • [DH] libavfilter/vf_hwdownload.c
  • [DH] libavfilter/vf_il.c
  • [DH] libavfilter/vf_mix.c
  • [DH] libavfilter/vf_stack.c
  • [DH] libavfilter/vf_swaprect.c
  • [DH] libavfilter/vf_telecine.c
  • [DH] libavfilter/vf_untile.c
  • [DH] libavfilter/vf_weave.c

• Apply simplex noise to image with ffmpeg

  26 avril 2022, par aalystama

  Is there any way to apply simplex noise on image with ffmpeg ?

  


  Implementation in JavaScript

  


  export function addGrain(out, image, slice, scale, intensity){
    let simplex = new SimplexNoise(new Alea());
    let od = out.data,
        id = image.data,
        w = image.width,
        h = image.height,
        ox = slice.x,
        oy = slice.y,
        d = Math.min(slice.width, slice.height);

    for(var y = 0; y < h; y++) {
        for(var x = 0; x < w; x++) {
            // reduce noise in shadows and highlights, 4 = no noise in pure black and white
            let i = (y*w+x)*4,
                l = (id[i]+id[i+1]+id[i+2])/768-0.5,
                rx = x + ox,
                ry = y + oy,
                noise = (simplex.noise2D(rx/d*scale, ry/d*scale) +
                         simplex.noise2D(rx/d*scale/2, ry/d*scale/2)*0.25 +
                         simplex.noise2D(rx/d*scale/4, ry/d*scale/4))*0.5;
            // reduce noise in shadows and highlights, 4 = no noise in pure black and white
            noise *= (1-l*l*2);
            noise *= intensity*255;
            od[i] = id[i]+noise; // R
            od[i+1] = id[i+1]+noise; // G
            od[i+2] = id[i+2]+noise; // B
        }
    }
}


  


  I've idea to do it with generic equation on each pixel geq but i need to get simplex noise value that is calculated from pixel's X and Y

  


  Resources

  


  

  • simplex-noise package in
JS

  


  


• HLS "bufferStalledError" / "bufferNudgeOnStall"

  20 avril 2022, par Yago

  I'm trying to stream videos with HLS.js, and it works perfectly fine, but when I separate the audio from the video to support multiple audio tracks, it returns these two errors at random times in the video ("bufferStalledError" and "bufferNudgeOnStall").

  


  I've tried using pure ffmpeg, I've tried using shaka packager, and I'm currently using bento4, but this error always occurs

  


  (my bento4 code)

  


  mp4hls --hls-version 4 -o "${outputFolder}" -f
[type=audio,+language=Japanese]"${inputFolder}${epFolder}/1080p.mp4"
[type=video]"${inputFolder}${epFolder}/1080p.mp4"
[type=video]"${inputFolder}${epFolder}/720p.mp4"
[type=video]"${inputFolder}${epFolder}/480p.mp4"
[type=video]"${inputFolder}${epFolder}/360p.mp4"
[type=video]"${inputFolder}${epFolder}/240p.mp4"