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• FFMPEG : Convert WebM VP8/VP9 multi-resolution video to MP4 (H.264)

  3 août 2020, par thedeadalive

  I have been trying to convert a multi-resolution WebM video ( VP9/VP8/H.264 ) (1280 x 1080 till the half, thereafter 1080 x 1280) to MP4 container with H.264 encoding for video.

  


  When transcoded with FFMPEG is locking into the frame size it's encountering at the start of the video (1280 x 1080 in this case) when transcoded with libvpx (for VP8 and VP9) and libx264 (for H264).

  


  The only instance i could get it right was when the Input WebM was having H.264 video and opus Audio, and ffmpeg was instructed to just copy the video stream and trans-code the Audio to aac only.

  


  Is there way in make ffmpeg support multi-resolution video transcoding ?

  


  How to generate a sample video : On a Chrome or Firefox (on a device that supports auto rotation and has different resolution on portrait and landscape) that supports mediaRecorder API goto this link : https://webrtc.github.io/samples/src/content/getusermedia/record/ , start recording a video , while recording the video, change orientation, stop recording and download the video. file)

  


  Discussion Reference : https://groups.google.com/a/webmproject.org/forum/# !topic/webm-discuss/IgumDyMAHY0

  


• Change video resolution in loop

  24 juillet 2020, par WoJo

  I am trying to decrease the resolution of a video to under 500x500. I don't want to change it to exactly 500x500 because that would mess up video quality. So what I am trying to do is to decrease the resolution by 75% in a loop, and that loop would only stop when the video is under 500x500. In theory that would not be hard, but I can't seem to figure it out.

  


  var vidwidth = 501; //Create variable and put it to 501
var vidheight = 501; //so that it won't go through the If Statement
fs.copyFile(filepath2, './media/media.mp4', (err: any) => { //Copy given file to directory
    console.log('filepath2 was copied to media.mp4'); //Log confirmation (Not appearing for some reason, but file is copied)
})
while (true) {
    getDimensions('./media/media.mp4').then(function (dimensions: any) { //Get dimensions of copied video
        var vidwidth = parseInt(dimensions.width)   //Parse to Int
        var vidheight = parseInt(dimensions.height) //and put in variables
    })
    ffmpeg('./media/media.mp4')                 //Call ffmpeg function with copied video path
        .output('./media/media.mp4')            //Set output to the same file so we can loop it
        .size('75%')                            //Reduce resolution by 75%
        .on('end', function() {                 //Log confirmation on end
            console.log('Finished processing'); //(Not appearing)
        })                                      //
        .run();                                 //Run function
    if (vidwidth < 500 && vidheight < 500) {    //Check if both the width and height is under 500px
        break;                                  //If true, break the loop and continue
    }
}


  


  This is the current code I am using with comments. Basically what happens is it gets stuck in the while loop because the dimensions of the video won't change. Tested with console.log() line. I think that if I can fix the ffmpeg problem somehow it will all be fixed.
I'd appreciate any help :)

  


  PS : This is all made in typescript, then build into js using npx tsc

  


• How to not allow upload of HD content ?More than 1920 x 1080 || 1080 x 1920 resolution files are not allowed since hardware reasons

  23 juillet 2020, par azaono

  Struggling with making limitation to uploade HD file/content. Intent is to have possibility to rotate content. Limits are required due to hardware reasons.

  


          val ffmpeg = FFmpeg("ffmpeg")
        val ffprobe = FFprobe("ffprobe")
        val probeResult = ffprobe.probe("$targetLocation")
        val stream: FFmpegStream = probeResult.getStreams()[0]
        val aspectRatio = stream.width.toDouble() / stream.height
        
        if (stream.width > 1920) {
            Files.delete(targetLocation)
            throw IncorrectResolutionFileException()
        } else if (stream.height > 1080) {
            Files.delete(targetLocation)
            throw IncorrectResolutionFileException()
        }

        if (type == "image") {
            part.transferTo(thumbnailLocation)
        }

        val builder: FFmpegBuilder = FFmpegBuilder()
            .setInput("$targetLocation")
            .addOutput("$thumbnailLocation")
            .setFrames(1)
            .setVideoFilter("select='gte(n\\,10)',scale=200:-1")
            .done()
        val executor = FFmpegExecutor(ffmpeg)
        executor.createJob(builder).run()

        return aspectRatio
    } catch (ex: Exception) {
        throw FileStorageException("Could not store file $cleanPath. Please try again!", ex)
    }
}