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• webm to mp4 conversion using ffmpeg ubuntu

  16 août 2018, par daemon

  I have video and I want to convert that to mp4 It is working fine for the .flv and other formats. But when I'm trying to convert webm to mp4 the video is not getting converted

  ffmpeg -i /input.webm /output.mp4
  

  It is only converting to a 48kb file. The actual size of video is 850mb

  I am getting this

  Output #0, mp4, to '/output.mp4':
    Metadata:
      encoder         : Lavf56.40.101
      Stream #0:0(eng): Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], q=-1--1, 29.97 fps, 30k tbn, 29.97 tbc (default)
      Metadata:
        encoder         : Lavc56.60.100 libx264
  Stream mapping:
    Stream #0:0 -> #0:0 (vp9 (native) -> h264 (libx264))
  Press [q] to stop, [?] for help
  Killed   21 fps=0.0 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A  
  

  It is working locally but on live server it's not generating the output as expected

• What is the algorithm to acheive audio decoding in C through ffmpeg ?

  16 août 2018, par Nani

  I want to decode the MP3 audio file, I want to know the algorithm in terms of C language API's. I have gone through dranger tutorials. But the API's they used are deprecated now. Could anyone tell me what are the API's I need to follow one by one?

• ffmpeg not working in google colab

  16 août 2018, par Nikhil Wagh

  I'm trying to use Google Colab to do something. Particularly I want to use ffmpeg package to create a video from a image.

  But ffmpeg doesn't seems to be working fine. Here is the link to my notebook : https://colab.research.google.com/drive/1YP-DSRoZO-Afz03tjwPfoxA-Kttm-2vK

  The output of this (in the last block) was supposed to be 400 400 instead of 0 0

  frame_width = int(cap.get(3))
  frame_height = int(cap.get(4))
  print frame_width, frame_height
  

  The same code is working fine with Azure notebooks and also on my local machine.

  What can be the reason for it? And how to rectify that?

• How to call ffmpeg of remote server with java

  16 août 2018, par user9151542

  I need to complete an interface in Java to implement video upload and compression. The compressed video can be played directly on the browser.I tried to install ffmpeg locally and use java to call, which is able to implement this function. But I don't know how to call ffmpeg on a remote server

• Pull a remote stream from server and then restream

  16 août 2018, par F.A

  I my working on Nginx RTMP server to restream iptv. I have two type of urls

  1- http://expamle.com:46801/live/3ni/ab/11939.ts

  2- http://example.com:8088/live/tv_10/playlist.m3u8?id=209&sionid=45&pk=54fb381ea

  Both URL's work in VLC media player.

  Now problem is that ffmpeg exec only URL with .ts extension. but not exec url without extension at end.

  How to pull stream from a remote server for that URL which not have .ts extension?

    exec_static ffmpeg -i http://example.com:80/live/sports_11/playlist.m3u8?id=209&sionid=45&pk=54fb31ea -c:v libx264 -preset veryfast -maxrate 1000k -bufsize 2000k -g 60 -b:a 128k -f flv rtmp://127.0.0.1;