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• avformat/hls : Don't strdup non-null-terminated string

  3 mars 2020, par Andreas Rheinhardt

  avformat/hls : Don't strdup non-null-terminated string
  If an URI indicated that the data protocol was in use, it would be
  
  copied into a temporary buffer via strncpy(dst, src, strlen(src)),
  
  thereby ensuring that the trailing \0 would not be copied, despite dst
  
  being uninitialized. dst would then be av_strdup'ed, leading to
  
  potential segfaults.
  The solution to this is simple : Don't copy the URI in the temporary
  
  buffer at all, instead av_strdup it directly.
  This fixes a -Wstringop-truncation warning emitted by GCC 9.2.
  Reviewed-by : Steven Liu <lq@chinaffmpeg.org>
  
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  

  • [DH] libavformat/hls.c

• avutil/opt : Don't use NULL for %s string in a log message

  29 mars 2020, par Andreas Rheinhardt

  avutil/opt : Don't use NULL for %s string in a log message
  If one calls av_opt_set() with an incorrect string to set the value of
  
  an option of type AV_OPT_TYPE_VIDEO_RATE, the given string is used in a
  
  log message via %s. This also happens when the string is actually a
  
  nullpointer in which case using it for %s is forbidden.
  This commit changes this by erroring out early in case of a nullpointer.
  This also fixes a warning from GCC 9.2 :
  
  "‘%s’ directive argument is null [-Wformat-overflow=]"
  Reviewed-by : Anton Khirnov <anton@khirnov.net>
  
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  

  • [DH] libavutil/opt.c

• Write base64 encoded string as Image with javascript

  21 avril 2020, par Manoj Kumar

  I am using FFmpeg and html2canvus and trying to create an mp4 video with the screenshots taken from a slider.

  



  here is my worker initialization

  



  const worker = createWorker({
    //logger: ({ message }) => console.log(message),
    progress: (p) => console.log(p),
});


  



  Then in click, I take the screenshots and putting into the video

  



  const image2video = async () => {
    displayLoader();
    var zip = new JSZip();
    let selectedbanners = $(".selected_templates:checked");
    await worker.load();
    let promise = new Promise((resolve, reject) => {
        let Processed = 0;
        selectedbanners.each(async function () {
            var dataIndex = $(this).data('index');
            let ad = adTemplates[dataIndex];
            var innercounter = 0;
            $(`.template-container-${ad.name}`).each(async function () {
                var imgData;
                await html2canvas($(`.template-container-${ad.name}`)[innercounter], {allowTaint: true, width: ad.width, height: ad.height}).then(canvas => {
                    imgData = canvas.toDataURL('image/jpeg', 1.0).split('base64,')[1];
                    //await worker.write(`tmp.${ad.name}.${innercounter}.png`, imgData);

                });
                await worker.write(`tmp.${ad.name}.${innercounter}.png`, imgData);
                //await worker.write(`tmp.0.png`, `static/triangle/tmp.0.png`);   This is working
            });
        });
    });
};


  



  I have setup a codepen here. It works if I put the image path but doesn't work if I directly pass the base64 string. Here I found that it also supports the base64 string as well as the URL.
This is how it looks in console

Thanks in advance.