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• How do i use libavfilter to deinterlace frames in my video player software

  19 juin 2014, par justanothercoder

  I’m using libavformat/libavcodec/libswscale/libavutil/libavfilter (ffmpeg related libraries) to make a video player.

  I’v gotten into issues with interlaced videos, it just pairs them incorrectly... It always draws the previous bottom frame with the current top frame. Which results in things I don’t want. And i’v tried messing about with the variables around this, it just won’t work. (I haven’t found a player which would play the videos I have correctly, no you can’t have them, i’m sorry)

  I managed to find a way around this, by re-encoding the video with the following command :

  ffmpeg -i video.mp4 -filter:v yadif -vcodec mpeg4 out.avi

  Now what i’d need is directions on how to do this with c++ code, inside my video player.

  I haven’t found any tutorials on the matter and the ffmpeg.c source code is just too alien to me.

  A link to a tutorial would be fine, i just haven’t found it..

  Edit :

  Also this example was worth checking out :

  https://github.com/krieger-od/imgs2video/blob/master/imgs2video.c

  It’s by a gentleman named Andrey Utkin

• ffmpegthumbnailer issue : dyld : Library not loaded : /usr/local/lib/libavutil.52.18.100.dylib

  18 octobre 2013, par scientiffic

  When I try to run ffmpegthumbnailer, I get the following error :

  dyld: Library not loaded: /usr/local/lib/libavutil.52.18.100.dylib
  
    Referenced from: /usr/local/bin/ffmpegthumbnailer
  
    Reason: image not found
  
    Trace/BPT trap: 5

  I installed ffmpeg using the directions here :

  http://ffmpeg.org/trac/ffmpeg/wiki/MacOSXCompilationGuide

  In my /usr/local/lib folder, I have the file "libavutil.a", but not the one specified in the error mesage.

  How can I solve this error ?

  This is what I was using to try to generate a thumbnail :

  ffmpegthumbnailer -i /public/uploads/tmp/1382121359-37490-7826/thumb_Untitled.mov -o /public/uploads/tmp/1382121359-37490-7826/tmpfile.png -c png -q 10 -s 158

• ffmpeg converted video from s3 bucket downloads before playing the video

  12 octobre 2020, par Rutu

  I making a video streaming application with react and node js.
I am converting video into different resolution with ffmpeg and storing directly to S3 bucket with the help of piping.

  


  I am streaming uploaded resolution video from S3 bucket directly through cloudfront in HTML5 tag with video.js

  


  When i tried to play original video through cloudfront in player its working fine, But as soon i play ffmpeg converted video to video player in cloudfront i am facing issue :

  


  Video takes a lot load (Downloads in browser) before playing in player.

  


  Below is my ffmpeg command

  


  await loadProcess( [&#xA;&#x27;i&#x27;,<s3 url="url" of="of" original="original" video="video">,&#xA;  &#x27;-movflags&#x27;,&#xA;  &#x27;frag_keyframe&#x2B;empty_moov&#x27;,&#x27;-vf&#x27;, &#x27;scale=-2:360&#x27;,&#x27;-c:v&#x27;,&#x27;h264&#x27;,&#x27;-profile:v&#x27;,&#x27;baseline&#x27;,&#x27;-r&#x27;,30,&#x27;-g&#x27;, 60,&#x27;-b:v&#x27;,&#x27;1M&#x27;,&#x27;-f&#x27;,&#x27;mp4&#x27;,&#x27;-&#x27;]&#xA;, outPath,&#x27;video/mp4&#x27;)&#xA;&#xA;</s3>

  


  this is my loadProcess function : i am using aws cli to direct upload resolution video to S3 bucket :

  


  export function loadProcess(ffmpegOptions, outPath,contentType) {
    return new Promise((resolve, reject) => {
        const  videoPath = outPath.replace(/\\/g, "/");
        let ffmpeg = spawn(conf.ffmpeg, ffmpegOptions);
        let awsPipe = spawn('aws', ['s3', 'cp', '--content-type', `${contentType}`, '-', `s3://${process.env.AWS_S3_BUCKET}/${process.env.AWS_S3_VIDEOS_FOLDER}${videoPath}` ])
        ffmpeg.stdout.pipe(awsPipe.stdin)

        // ffmpeg write stream flow
        let ffmpegData = ''
        ffmpeg.stderr.on('data', (_data) => {
            ffmpegData += _data.toString();
        })
        ffmpeg.on('close', (code) => {
            if (code === 0) {
                resolve(outPath)
            }
            else {
                let _dataSplit=ffmpegData.split('\n');
                _dataSplit.pop();
                console.log({action: 'close', message:_dataSplit.pop(), more:[conf.ffmpeg].concat(ffmpegOptions).join(' ')+'\n'+ffmpegData, code})
            }
        });
        ffmpeg.on('error', (err) => {
            reject({action: ' ffmpeg error', message: err});
        });
        
        // aws s3 cli read stream pipe flow
        let awsPipeData = ''
        awsPipe.stderr.on('data', _data => {
            awsPipeData += _data.toString()
        });
        awsPipe.on('close', (code) => {
            if (code === 0) {
                resolve(outPath)
            }else{
                console.log({action: 'close', message: awsPipeData})
            }
        });
        awsPipe.on('error', (err) => {
            reject({action: 'awsPipe error', message: err});
        })

    })
}


  


  I have tried using +faststart option in ffmpeg but getting command failed error.
Can someone please help me this ?

  


  Thanks in advance