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• Resize videos in android

  18 février 2014, par Christopher Johnson

  I'm looking to resize videos captured using the MediaStore Intent after they have been saved to the SD card. I've done similar things with c# and ffmpeg and thought about using that with android but I've yet to be able to find a way to incorporate that into my eclipse running on my windows 7 machine.

  I'm a total *nix noob so all of the solutions that I've found for building ffmpeg into an android app are completely greek to me.

  Is there an alternative solution to ffmpeg that perhaps is already built into the android sdk for resizing videos ?

  I'm just looking for the path of least resistance here...

• Encode PNG images to MP4

  12 avril 2020, par xybrek

  I'm using FFMPEG.js to convert PNG images into MP4 in the Browser with this code :

  



      const { createWorker } = FFmpeg;
    const worker = createWorker({
        corePath: 'ffmpeg-core.min.js',
        progress: (p) => console.log(p),
        logger: ({ message }) => console.log(message),
    });
    const image2video = async (frames) => {
        console.log('Loading ffmpeg-core.min.js');
        await worker.load();
        console.log('Loading data');

        const d = new Date();
        const timestamp = d.getTime();

        for(let i = 0; i < frames.length; i += 1) {
            const num = `00${i}`.slice(-3);
            const fileName = `tmp.${timestamp}.${num}.png`;
            console.log(fileName);
            await worker.write(fileName, frames[i]); // base64 'image/png'
            const { file } = await worker.read(fileName);
            // throws -> Uncaught (in promise) TypeError: Cannot read property 'buffer' of undefined
            const testFile = URL.createObjectURL(new Blob([file.buffer], { type: 'image/png' }));
            console.log(testFile);
        }
        await worker.run('-framerate 30 -pattern_type glob -i /data/*.png -c:a copy -shortest -c:v libx264 -pix_fmt yuv420p out.mp4', { output: 'out.mp4' });
        const { data } = await worker.read('out.mp4');
        const outputURL = URL.createObjectURL(new Blob([data.buffer], { type: 'video/mp4' }));
        console.log(outputURL);
    }


  



  However it throws :

  



  [png @ 0x1175980] Warning: not compiled with thread support, using thread emulation
[image2 @ 0x1177180] Could not open file : /data/*.png
[image2 @ 0x1177180] Could not find codec parameters for stream 0 (Video: png, none(pc)): unspecified size
Consider increasing the value for the 'analyzeduration' and 'probesize' options
Input #0, image2, from '/data/*.png':
Duration: 00:00:00.03, start: 0.000000, bitrate: N/A
Stream #0:0: Video: png, none(pc), 30 tbr, 30 tbn, 30 tbc
Output #0, mp4, to 'out.mp4':
Output file #0 does not contain any stream


  



  What could be missing here ?

  


• Consume RTSP stream from users browser without converting on the server

  19 août 2018, par Kazanz

  I have thousands of IP cameras that need to be displayed to various users that are all outputing RTSP streams. Right now I have a server that uses ffpmeg to convert the stream to mpeg video that is then consumed and served over websockets via a node app.

  My problem is that these two processes take up a ridiculous amount of memory. About a half a GB for each camera.

  Is there any way to offload the conversion and reading of the stream to the client’s machine in their browser, or potentially out of it ?