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• Is there a way to play fragmented mp4 at random chunk ?

  4 février 2021, par Kate Evklid

  Say there is a video rendered into fragmented mp4 consisting of a number of chunks/fragments. The question is : after the init was loaded to MediaSource buffer, is there a way to play a random fragment ?

  


  A small research of the thing's specifications gave little understanding of the problem. Fragments seem to have a kind of an order IDs hardcoded in them. It's a fairly reasonable idea to include it in a file in case of unreliable connection and asynchronous fetching while streaming content, but is there a way to parse a chunk and change its ID using JavaScript ?

  


  The code below is just playing 2 minute video split into 12 fragments based on user's time and is supposed to be able to start at any chunk (not only the first) and then to repeat.

  


  let mediaSource = new MediaSource
document.getElementById('video').src = URL.createObjectURL(mediaSource)

mediaSource.addEventListener('sourceopen', () => {
    let buffer = mediaSource.addSourceBuffer('video/mp4; codecs="avc1.42E01E, mp4a.40.2"')
    let loadToBuffer = url => {
        let xhr = new XMLHttpRequest
        xhr.responseType = 'arraybuffer'
        xhr.open('GET', url, true)
        xhr.addEventListener('loadend', () => buffer.appendBuffer(new Uint8Array(xhr.response)))
        xhr.send()
    }
    loadToBuffer('video/init.mp4')
    setInterval(() => loadToBuffer('video/video' + (Math.floor(new Date().getTime() / 1000 / 10) % 12) + '.m4s'), 10 * 1000)
})


  


• Could not open codec 'libopenh264' : Unspecified error

  13 mars 2017, par Gingerbread

  I am using OpenCV to process videos for my research. I have Python 2.7 and OpenCV 3.2 versions installed on Windows 10. When I do background subtraction on a video in Python using OpenCV, it works fine and produces the output. However, when I try to save the background subtracted video, it throws this error :

  warning: Error opening file (/build/opencv/modules/videoio/src/cap_ffmpeg_impl.hpp:779)
  
  warning: MAH00119.avi (/build/opencv/modules/videoio/src/cap_ffmpeg_impl.hpp:780)
  
  OpenCV: FFMPEG: tag 0x34363258/'X264' is not supported with codec id 28 and format 'h264 / raw H.264 video'
  
  
  
  Failed to load OpenH264 library: openh264-1.6.0-win64msvc.dll
  
      Please check environment and/or download library: https://github.com/cisco/openh264/releases
  
  
  
  [libopenh264 @ 0000000001f5bf60] Incorrect library version loaded
  
  Could not open codec 'libopenh264': Unspecified error

  I am processing MP4 videos. And I followed the instructions carefully while installing ffmpeg, like adding the bin’s path to environment variables. I don’t know what else to do. Stuck on this for three days now.

  Any help would be much appreciated !
  Thanks in advance !!

• Could not open codec 'libopenh264' : Unspecified error

  15 novembre 2023, par Gingerbread

  I am using OpenCV to process videos for my research. I have Python 2.7 and OpenCV 3.2 versions installed on Windows 10. When I do background subtraction on a video in Python using OpenCV, it works fine and produces the output. However, when I try to save the background subtracted video, it throws this error :

  



  warning: Error opening file (/build/opencv/modules/videoio/src/cap_ffmpeg_impl.hpp:779)
warning: MAH00119.avi (/build/opencv/modules/videoio/src/cap_ffmpeg_impl.hpp:780)
OpenCV: FFMPEG: tag 0x34363258/'X264' is not supported with codec id 28 and format 'h264 / raw H.264 video'

Failed to load OpenH264 library: openh264-1.6.0-win64msvc.dll
    Please check environment and/or download library: https://github.com/cisco/openh264/releases

[libopenh264 @ 0000000001f5bf60] Incorrect library version loaded
Could not open codec 'libopenh264': Unspecified error


  



  I am processing MP4 videos. And I followed the instructions carefully while installing ffmpeg, like adding the bin's path to environment variables. I don't know what else to do. Stuck on this for three days now.

  



  Any help would be much appreciated !
Thanks in advance !!