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• Smart y coordinate to make vertical alignment for the text with typewriting effect

  31 août 2021, par Макс Шульдинер

  I'm doing animation for the typewriting effect. Here is my ffmpeg string :

  


  -i ffmpeg_inputs/output-onlinegiftools.gif  -vf "[in]drawtext=fonts/RobotoMono-Regular.ttf:text='h':fontcolor=orange:fontsize=35:x=(w-text_w)/2-200+0:y=h-th-400:enable='between(t,0.00, 7.80)', drawtext =fonts/RobotoMono-Regular.ttf:text = 'i':fontcolor=orange:fontsize=35:x=(w-text_w)/2-200+25:y=h-th-400:enable='between(t,0.80, 7.80)', drawtext =fonts/RobotoMono-Regular.ttf:text = 'g':fontcolor=orange:fontsize=35:x=(w-text_w)/2-200+75:y=h-th-400:enable='between(t,1.60, 7.80)', drawtext =fonts/RobotoMono-Regular.ttf:text = 'u':fontcolor=orange:fontsize=35:x=(w-text_w)/2-200+100:y=h-th-400:enable='between(t,2.40, 7.80)', drawtext =fonts/RobotoMono-Regular.ttf:text = 'y':fontcolor=orange:fontsize=35:x=(w-text_w)/2-200+125:y=h-th-400:enable='between(t,3.20, 7.80)', drawtext =fonts/RobotoMono-Regular.ttf:text = 's':fontcolor=orange:fontsize=35:x=(w-text_w)/2-200+150:y=h-th-400:enable='between(t,4.00, 7.80)'[out]" ffmpeg_outputs/test2.gif -y 


  


  Here is the results with different y values :

  


  

  


  

  


  As i understand, to make smooth sentence, for some letters i need top vertical alignment, and for others i need bottom vertical alignment. How can i make this "smart alignment", or the only one method is to hardcode y values for different letters ?

  


• Restreaming and transcoding a hls stream with FFMPEG.WASM fails due to tcp connection

  13 juillet 2021, par Hoang Nguyen

  I'm trying to implement a feature which is live transcoding a hls stream (h265) to another hls stream (h264) so the video can be played using html5 video player as we know that h265 is not supported on browsers. Quick summery of my tech stack :

  


  -Electron desktop app as the client.
-FFMPEG.WASM library : https://ffmpegwasm.github.io/

  


  (*) The on-the-fly transcoding is supposed to happen right on the client side.

  


  My dev enviroment :

  


  "devDependencies": { "electron": "^13.1.5", "electron-packager": "^13.0.1", "electron-winstaller": "^2.7.0" }

  


  There are 2 ways to use this library, one is as normal html script, and the other is nodejs style which I have tried both and get different errors (though they are all about connection) :

  


  (*) Regular JS way

  


  <code class="echappe-js">&lt;script async defer src=&quot;https://unpkg.com/@ffmpeg/ffmpeg@0.10.1/dist/ffmpeg.min.js&quot;&gt;&lt;/script&gt;&#xA;Play
  &#xA;&lt;script&gt;&amp;#xA; async function loadPlayerHEVC() {&amp;#xA;var resource = &amp;#x27;http://10.70.39.32:80/streams/60dd68fdc88f570012526657/stream/60dd68fdc8....526657.m3u8&amp;#x27;&amp;#xA;                    const { createFFmpeg } = FFmpeg;&amp;#xA;                    const ffmpeg = createFFmpeg({ log: true });&amp;#xA;                    const { fetchFile } = FFmpeg;&amp;#xA;                    await ffmpeg.load();&amp;#xA;                    await ffmpeg.run(&amp;#x27;-re&amp;#x27;,&amp;#x27;-i&amp;#x27;, resource, &amp;#x27;-vcodec&amp;#x27;, &amp;#x27;libx264&amp;#x27;, &amp;#x27;-acodec&amp;#x27;, &amp;#x27;copy&amp;#x27;, &amp;#x27;-f&amp;#x27; ,&amp;#x27;hls&amp;#x27;, &amp;#x27;-hls_list_size&amp;#x27;, &amp;#x27;3&amp;#x27;, &amp;#x27;-hls_wrap&amp;#x27;, &amp;#x27;5&amp;#x27;, &amp;#x27;playlist.m3u8&amp;#x27; );&amp;#xA;                    // ffmpeg.exit(0);&amp;#xA;                }&amp;#xA;            &lt;/script&gt;&#xA;
  

  


  

  


  (*) Nodejs way

  


  async function tester(url)
{
    const { createFFmpeg, fetchFile } = require('@ffmpeg/ffmpeg');
    const ffmpeg = createFFmpeg({ log: true });
    await ffmpeg.load();
    await ffmpeg.run('tcp','-re', '-i', url, '-vcodec', 'libx264', '-acodec', 'aac', '-f', 'flv', '-hls_list_size', '3', '-hls_wrap', '5', 'playlist.m3u8');
    // ffmpeg.exit(0);
}


  


  

  


  URL for testing

  


  You guys can use this public stream to reproduce the scenario : http://113.163.94.245/hls-live/livepkgr/_definst_/liveevent/thbt.m3u8

  


  Any help would be much appreciated.

  


• How to extract tiles from ffmpeg thumbnails by cutting them to the length of the video

  22 mars 2021, par JeeNi

  I have searched in many ways to solve this problem. But I can't find an answer, so I leave a question.

  


  ffmpeg -i thumb_test.mp4 -filter_complex "select='isnan(prev_selected_t)+gte(t-prev_selected_t\,5)',scale=120:-1,tile=layout=60x60" -vframes 1 -q:v 2 thumb.jpg


  


  The result of the command I used is as follows.

  


  enter image description here

  


  The remaining space remains black, making the file size larger.
To solve this method, I would like to specify the tile size as much as the video length when extracting thumbnails.
Please let me know if there is a solution.

  


  Thank you.