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• Pipe a HTTP response

  30 juillet 2014, par viperfx

  How do I pipe an HTTP response like in NodeJS. Here is the snippet I am using in NodeJS :

  request({
  
    url: audio_file_url,
  
  }).pipe(ffmpeg_process.stdin);

  How can I achieve the same result in Go ?

  I am trying to pipe a audio stream from HTTP into an FFmpeg process so that it converts it on the fly and returns the converted file back to the client.

  Just so its clear to everyone here is my source code so far :

  func encodeAudio(w http.ResponseWriter, req *http.Request) {
  
      path, err := exec.LookPath("youtube-dl")
  
      if err != nil {
  
          log.Fatal("LookPath: ", err)
  
      }
  
      path_ff, err_ff := exec.LookPath("ffmpeg")
  
      if err != nil {
  
          log.Fatal("LookPath: ", err_ff)
  
      }
  
  
  
      streamLink := exec.Command(path,"-f", "140", "-g", "https://www.youtube.com/watch?v=VIDEOID")
  
  
  
      var out bytes.Buffer
  
      streamLink.Stdout = &out
  
      cmdFF := exec.Command(path_ff, "-i", "pipe:0", "-acodec", "libmp3lame", "-f", "mp3", "-")
  
      resp, err := http.Get(out.String())
  
      if err != nil {
  
          log.Fatal(err)
  
      }
  
      // pr, pw := io.Pipe()
  
      defer resp.Body.Close()
  
      cmdFF.Stdin = resp.Body
  
      cmdFF.Stdout = w
  
      streamLink.Run()
  
      //get ffmpeg running in another goroutine to receive data
  
      errCh := make(chan error, 1)
  
      go func() {
  
          errCh <- cmdFF.Run()
  
      }()
  
  
  
      // close the pipeline to signal the end of the stream
  
      // pw.Close()
  
      // pr.Close()
  
  
  
      // check for an error from ffmpeg
  
      if err := <-errCh; err != nil {
  
          // ff error
  
      }
  
  }

  Error : 2014/07/29 23:04:02 Get : unsupported protocol scheme ""

• Fix CBR output for IP multicasting video

  19 août 2014, par ddhung

  I’m using ffmpeg for transcoding live ip multicasting video on server linux Centos 5.9 OS. This is my ffmpeg command

  ffmpeg -i "udp:// x.x.x.x:6000?fifo_size=1000000&overrun_nonfatal=1&timeout=1000000" -filter:v yadif=0:-1:1 -vcodec libx264 -vprofile main -level 30 -tune zerolatency -pass 1 -b:v 900k -minrate 900k -maxrate 900k -bufsize 900k -x264opts nal_hrd=cbr:rc_lookahead=40:interlaced=1:scenecut=0:cabac=1:keyint=120:deblock=0,0:aud=1:qpmin=16:qpmax=51:qpstep=10:ref=2:mixed-refs=1:subme=9:me=esa:chroma_me=0:merange=64:8x8dct=0:fast_pskip=0:chroma_qp_offset=0:trellis=2:psy=0:bframes=0:weightp=2:sliced_threads -s:v 720x576 -r:v 25 -force_key_frames 'expr:gte(t,n_forced*3)' -threads 0 -acodec aac -strict -2 -ac 1 -ar 32000 -b:a 32k -filter:a volume=1 -f mpegts -muxrate 1400k udp://x.x.x.x:6000?pkt_size=1316

  My output video is for broadcasting so I have to configure CBR video output by feature –muxrate. But when I watch this stream on VLC the bitrate change very much not constant. The null packet is very high to force cbr mpeg2ts output.

  I also measure IP output video by HST3000 JDSU equipment and I see the measurement result is very bad as images.
  The PCR Jitter, IGMP Latency, Jitter Max which is not good as measurement standard by JDSU

  I try many way to change the ffmpeg command but not successful. The bitrate changes sometime > 1400kbps a lot. I think the problem may be the bitrate not constant. I have heard to change the muxrate output is CBR, it had to be change the code C mpegtsenc.c in libavformat library to new patch.
  So could you help me fix this problem and make the measurment result is better.
  Thank you so much.

  Best Regards

• License or not ? As website owner do i have to pay license for using ffmpeg (x264) -> mp4 decoding in my webiste ?

  28 août 2014, par linderman

  I am very confused about my legal or illegal rights to use H.264 mp4 file.

  I had long time reading various websites about should i pay license or not ... still cant understand ..

  So here is the exact situation :

  I have website , where users can upload their videos. Videos are taken with their smart-phones or home cameras , or webcam etc.

  After they upload their videos , i am using FFMPEG (x264) to convert the video from 3gp, mov, or even "mp4 to mp4".

  Then other users can watch these decoded videos on my website.

  I am not charging the end users anything. My website is free for uploaders and viewers.

  You will be right if you say that my website have the same purpose as youtube - and you will be right.. video sharing !

  So ME - as website owner , hosting buyer and ffmpeg user ... should i have to pay license ? OR ABANDON THE MP4 decoding in my website ?

  Thank you