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• Video playing, how to play a video back a a rapid rate at random timestamp locations

  10 avril 2020, par Zarc Rowden

  Note : this is a mildly general question that is looking more for pointers in the right direction and not exactly requiring a concise coded answer. I appreciate any and all input, thank you for lending your brain power to me for this moment :)

  



  I have a script that receives midi messages in real time and triggers playback of a single video on various timestamps that are changed/selected regularly and randomly by a user. Currently this is working in the browser, however, I've realized that there is some noticeable latency between (i'm guessing the cause here so please correct me) the moment a request to play a video at a specific time is made(note : the video is not being requested over the wire, this action does not take place until a JS Blob Url is loaded into the player) and the moment where that request is fulfilled and delivered from storage to pixels on the screen.

  



  My question is : Is it reasonable to assume that there is a tool out there, that given the correct video format and optimizations both in the code and in the file that could load an entire, say : 1 gb video into memory and play it back at random timestamps every 60 milliseconds at completely random, constantly changing timestamps.

  



  If you're now all the way down here... Thanks for reading this far, or scanning ! Please let me know if this question makes any sense / could be improved, I'm happy to clarify further.

  


• Firefox does not support mkv format videos, need to convert video to mp4

  21 mai 2021, par sambhav jain

  I am making a screen recorder app that records your screen and upload the video to the s3 bucket. the video is in mpv format. the mkv format is supported by chrome, edge but not by firefox. Firefox supports the mp4 format. so how do I convert the video to mp4 format for firefox ? videofile is in mkv which needs to be converted to mp4

  


  handleUpload() {
    for (let i = 0; i < this.files.length; i++) {
      this.awsUploadService
        .getSignedUrlS3(this.files[i]["name"], this.files[i]["type"])
        .subscribe(
          ({ url, keyFile }) => {
            this.awsUploadService
              .uploadfileAWSS3(url, this.files[i]["type"], this.files[i])
              .subscribe(
                (data) => {
                  if (data["type"] === 1) {
                    this.files[i]["progress"] =
                      (data["loaded"] / data["total"]) * 100;
                  }
                  if (data["type"] === 4) {
                    this.files[i]["isUploadCompleted"] = true;
                    this.files[i][
                      "uploadLocation"
                    ] = `https://${environment.S3_BUCKET_NAME}.s3.${environment.S3_Region}.amazonaws.com/${keyFile}`;
                  }
                },
                (error) => {
                  this.files[i].isUploadCompleted = false;
                  throw error;
                }
              );
          },
          (error) => {
            this.files[i].isUploadCompleted = false;
            throw error;
          }
        );
    }
  }


  


• need more clarity on compiling syntax for shared binaries using static dependencies

  22 juin 2016, par art vanderlay

  I am compiling on linux and am trying to understand the complexities of shared and static libs, what can be done and what should not be done.

  Using the example of ffmpeg, I have x264 as an included dependency.

  Based on many posts here on SO, it seems a static build of x264 would be best. Then load these into several different version of ffmpeg dynamically as needed.

  What is the correct configure syntax when compiling both binaries.

  scenario one

  x264 --enable-static --disable-shared
  
  ffmpeg --disable-static --enable-shared --enable-libx264  

  or the other way round

  x264 --disable-static --enable-shared    
  
  ffmpeg --enable-static --disable-shared --enable-libx264  

  scenario two, assume a theoretical dependency waterfall, where we must include (prog-x into x264) then x264 dynamically loaded into ffmpeg

  progx--enable-static --disable-shared     
  
  x264 --enable-static --disable-shared
  
  ffmpeg --disable-static --enable-shared --enable-libx264