Recherche avancée

Sur d’autres sites (4944)

• Recording transport stream to file in ffmpeg

  9 juillet 2020, par Neil Bernard

  I'm streaming a dvb-t mux and I want to dump it to file using ffmpeg on another PC.

  


  Here is the command :

  


  ffmpeg -i rtp ://192.168.1.93:20000 -acodec copy -vcodec copy d34_tw.ts

  


  For some reason though its only saving 1 video and 1 audio random pid ? not the whole TS ?

  


  Thoughts ?

  


  Neil

  


• avcodec/srtdec : attempt to correct SubRip positioning

  8 février 2015, par Clément Bœsch

  avcodec/srtdec : attempt to correct SubRip positioning
  The positioning was completely wrong. First, the coordinates are
  
  expressed in ASS playback resolution (which is by default 384x288).
  
  Secondly, the coordinates define a drawing rectangle, not a moving area.
  
  The previous code was making subtitles move from a random position to
  
  another random position.
  Here we rescale assuming the video resolution is a DVD one (720x480). We
  
  can’t really do anything better so far, but since this positioning
  
  information is often from a DVD rip we can consider them relatively
  
  safe.
  

  • [DH] libavcodec/srtdec.c
  • [DH] tests/ref/fate/sub-srt

• FFMPEG multiple screenshots command

  8 octobre 2020, par Jhony code

  iam trying to code a function which creates images from video files using ffmpeg.

  


  But now i want to know how can i make that with ffmpeg commands exactly, because i use wrapper and now i have some limitations, so i must go in the native way.

  


  So, first of all i have decided to use a Wrapper which is called node-fluent-ffmpeg.

  


  And this is my work-around with the Wrapper :

  


  ffmpeg({
        source: `The video file...`,
      })
        .on("filenames", async (filenames) => {
        })
        .on("error", function (err) {
          console.log("Error in filenames section: " + JSON.stringify(err));
        })
        .on("end", function () {
          console.log("Screenshots taken");
        })
        .screenshots({
          count: 60,
          folder: "tmp/",
          filename: "thumbnail-at-%i.png",
          size: "1600x900",
        })
        .on("end", function (stdout, stderr) {
            let newImg = await fs.createReadStream(`/tmp/${img}`);
            destparams = await {
              Bucket: dstBucket,
              Key: "uploaded-" + img,
              Body: newImg,
              ContentType: "image",
            };
           await s3.putObject(destparams).promise();


  


  }) ;

  


  Notes for understanding me better :

  


  


  • I still want to make it in node.js

    


  


  • Let's assume the file is : "The video file..."

    


  


  • I am taking 60 screenshots from the video in a random way, like it
does not matter the length of the video it will just take 60 screenshots from start until the end of the video.

    


  


  • Every screenshot taken will have a prefixed and ordered number and name for every frame.
For example : thumbnail-at-1.png, thumbnail-at-2.png, thumbnail-at-3.png and it continues until it reaches the 60 screenshot limit.

    


  


  • Every screenshot will be saved with a 1600x900 resolution.

    


  


  • Every screenshot will be saved in the TMP folder.

    


  


  • Do not mind reading this : After all I'll upload every screenshot to a s3 bucket.

    


  


  • I had search trough a lot of old forums, but it seems that ffmpeg has
a poor documentation (I have been stuck, so hard to understand).

    


  


  


  So my main goal is :

  


  How i can make exactly that function that i have shown in the code sample and the quick notes, with the FFMPEG commands ? (Not with the wrapper)

  


  (Sorry that i'm trying to make it simpler)

  


  I mean, Which commands i must use, with the FFMPEG commands in the following code sample ?

  


  By the way : it is node.js,

  


  Do not really know what to do, sorry

  


  spawnSync(
      "/opt/ffmpeg/ffmpeg",
      [
        "-i",
        ``,
        "-f",
        "",
        ``
      ],
      { stdio: "inherit" }
 );


  


  Thanks for your patience !

  


  Enviroment :

  


  

  • Node.js 12.x

  


  • FFMPEG (4.3.1)