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• lavf/http.c : Free allocated client URLContext in case of error.

  12 janvier 2018, par Stephan Holljes

  lavf/http.c : Free allocated client URLContext in case of error.
  Signed-off-by : Stephan Holljes <klaxa1337@googlemail.com>
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavformat/http.c

• How to stream with ffmpeg over http protocol ?

  27 octobre 2023, par Çağlayan

  ffmpeg -f dshow -i video="Chicony USB2.0 Camera" -pixel_format bgr24 -r 30 -s 640x480 -c:v libx264 -preset ultrafast -tune zerolatency -f mpegts https://172.16.142.252:8888/live.mjpg


  


  When I run this command I get the following problem. What is the reason and how do I solve it ?

  


  Input #0, dshow, from 'video=Chicony USB2.0 Camera':
  Duration: N/A, start: 5498.027651, bitrate: N/A
  Stream #0:0: Video: mjpeg (Baseline) (MJPG / 0x47504A4D), yuvj422p(pc, bt470bg/unknown/unknown), 1280x720, 30 fps, 30 tbr, 10000k tbn
[dshow @ 00000239732d1740] real-time buffer [Chicony USB2.0 Camera] [video input] too full or near too full (73% of size: 3041280 [rtbufsize parameter])! frame dropped!
[dshow @ 00000239732d1740] real-time buffer [Chicony USB2.0 Camera] [video input] too full or near too full (95% of size: 3041280 [rtbufsize parameter])! frame dropped!
    Last message repeated 2 times
[dshow @ 00000239732d1740] real-time buffer [Chicony USB2.0 Camera] [video input] too full or near too full (103% of size: 3041280 [rtbufsize parameter])! frame dropped!
    Last message repeated 131 times
[tcp @ 0000023973305d00] Connection to tcp://172.16.142.252:8888 failed: Error number -138 occurred
[out#0/mpegts @ 00000239732fb540] Error opening output https://172.16.142.252:8888/live.mjpg: Error number -138 occurred
Error opening output file https://172.16.142.252:8888/live.mjpg.
Error opening output files: Error number -138 occurred


  


  i am trying to stream with ffmpeg via http protocol

  


• HTTP Header for Duration of a MP4 for HTML 5 video

  9 mars 2014, par Mustafa

  I am trying to stream MP4 video as it is encoded from a webserver. I believe I used the appropriate flags, but it is not working correctly. When I download the video from my stream and open it with VLC, it properly shows the duration. Since a socket is not seekable, I assume it writes the metadata to end ? My Chrome browser always shows 8 seconds duration. The first 8 seconds plays at the normal speed, but afterwards the pause button turns into play button and the video plays very fast, probably as fast as it is recieved. However the audio is played at normal speed. I tried document.getElementById('myVid').duration = 20000 but it is a readonly field.

  I wonder, is there anyway to explicitly state the duration in HTTP headers or in any other way ? I cannot find any documentation about it.

  ffmpeg -i - -vcodec libx264 -acodec libvo_aacenc -ar 44100 -ac 2 -ab 128000 -f mp4 -movflags frag_keyframe+faststart pipe:1 -fflags +genpts -re -profile baseline -level 30 -preset fast

  To close-voters, that thinks it is not programming related, I use it in my own server I coded, and I need to set the duration programatically via JavaScript or setting the HTTP header. I believe it may be related to both ffmpeg or http headers, that's why I posted it here.

  app.get("/video/*", function(req,res){
  
      res.writeHead(200, {
  
          'Content-Type': 'video/mp4',
  
      });
  
      var dir = req.url.split("/").splice(2).join("/");
  
      var buf = new Buffer(dir, 'base64');
  
      var src = buf.toString();
  
  
  
      var Transcoder = require('stream-transcoder');
  
      var stream = fs.createReadStream(src);
  
      // I added my own flags to this module, they are at below:
  
      new Transcoder(stream)
  
          .videoCodec('libx264')
  
          .audioCodec("libvo_aacenc")
  
          .sampleRate(44100)
  
          .channels(2)
  
          .audioBitrate(128 * 1000)
  
          .format('mp4')
  
          .on('finish', function() {
  
              console.log("finished");
  
          })
  
          .stream().pipe(res);
  
  });

  exec function in that stream-transcoder module,

      a.push("-fflags");
  
      a.push("+genpts");
  
      a.push("-re");
  
      a.push("-profile");
  
      a.push("baseline");
  
      a.push("-level");
  
      a.push("30");
  
      a.push("-preset");
  
      a.push("fast");
  
      a.push("-strict");
  
      a.push("experimental");
  
      a.push("-frag_duration");
  
      a.push("" + 2 * (1000 * 1000));
  
      var child = spawn('ffmpeg', a, {
  
          cwd: os.tmpdir()
  
      });