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• Revision ce274c5ced : Merge "Removed redundant local variables in the forward hybrid transforms."

  8 janvier 2015, par Zoe Liu

  Merge "Removed redundant local variables in the forward hybrid transforms."

• How to play an local video in arbitrary codec and format in browser ? [closed]

  24 septembre 2023, par HanXu

  I am developing a video player in browser to let the user select a local video to play, and want to support as many video formats as possible. I know that in browser a video tag can only play videos in a limited set of codecs, and on desktop libraries like VLC can play literally any videos. I would like to bring that broad compatibility to the browser, but not sure how to achieve it.

  


  One thing come up in my mind is to let the user run a thin client natively, which read the local video and stream it at, say, http://localhost:8080, in some web-friendly codec and format, and in the frontend I use a video with src to be http://localhost:8080.

  


  In the client I think I need to run some ffmpeg command to somehow stream and process the video in real-time. I also run into the libVLC which seems nice, and am not sure which one to use.

  


  Furthermore, I need to enable the user to seek to any arbitrary timestamp, and am not sure if the streaming technic supports it.

  


  I have done some googling, and found a method which first runs a ffmpeg command as

  


  VIDSOURCE="/some/video.mp4"
AUDIO_OPTS="-c:a aac -b:a 160000 -ac 2"
VIDEO_OPTS="-s 854x480 -c:v libx264 -b:v 800000"
OUTPUT_HLS="-hls_time 10 -hls_list_size 10 -start_number 1"
ffmpeg -i "$VIDSOURCE" -y $AUDIO_OPTS $VIDEO_OPTS $OUTPUT_HLS /some/public/video.m3u8


  


  and in the frontend I can use the react-player to play the video like

  


  <reactplayer url="/some/public/video.m3u8"></reactplayer>&#xA;

  


  However, I can not seek to an arbitrary timestamp, and the ffmpeg command creates a lot of .ts files one by one about which I am not sure what is going on. It seems that before it creates a video77.ts, I can not seek to timestamp within that segment.

  


  All in all, I am looking for some solution like

  


  

  


  that supports

  


  

  • playing videos in browsers in as many codecs and formats as possible,

  


  • allowing users to seek to any arbitrary timestamp.

  


  


  Since many native video player like VLC supports it, I believe it can be done. Does anyone have any idea that may help ? Appreciate in advance !

  


• How to decode the video stream of an mp4 file and save the decoded images to local directory in NodeJs

  8 août 2018, par Rohit Verma

  How to decode the video stream of an mp4 file and save the decoded images to local directory in NodeJs. I have tried ffmpeg and fluent ffmpeg but didn’t get clear idea how to use,As I was getting error while using fluent ffmpeg

  Code snippet :

      const ffmpeg = require('fluent-ffmpeg') 
  
      const probe = require('ffmpeg-probe')
  
  
  
  const info = await probe('input.mp4')

  and in case of ffmpeg I have tried this,

   var ffmpeg = require('ffmpeg');
  
  
  
   try {
  
      var process = new ffmpeg("VID_20160805_121411556.mp4");
  
      process.then(function (video) {
  
          // Callback mode
  
          video.fnExtractFrameToJPG('C:/Users/PcName/Documents', {
  
              frame_rate : 1,
  
              number : 5,
  
              file_name : 'my_frame_%t_%s'
  
          }, function (error, files) {
  
              if (!error)
  
                  console.log('Frames: ' + files);
  
          });
  
      }, function (err) {
  
          console.log('Error: ' + err);
  
      });
  
  } catch (e) {
  
      console.log(e.code);
  
      console.log(e.msg);
  
  }

  Nothing is working and I didn’t get any clue how to do so.