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• Kodi : playback several video files from the internet as single movie with single timeline

  30 mai 2018, par HarryFox

  I’m writing an add-on for Kodi in Python, for a site with movie collection, which can be able to playback online video from the site. But problem is that many of them splitted apart on pieces of different length. And its not mpeg dash nor m3u playlists, its just individual pieces of single movie or an episode.

  My target is able to play those splitted videos as single movie with single timeline and playback will no require download all pieces of a movie. It’s important because many of Movies\episodes provides with subtitle file, that why single timeline is important. Also general idea for plugin which I’m writing is comfort to use, so online playback is very important too.

  I did some research but it almost no result. On official Kodi forum advise to create Input Stream add-on like Input Stream Adaptive, but it was written on c++ and it’s unattainable for me (for now at least). There is no tools for python to create such kind of add-ons.

  Another idea is to create middle server which on fly will somehow (with ffmpeg) combine those pieces, but it seems that the process will too resource-intensive especially for TV-boxes.
  In this case also raise many question about which way is better, and i have no enough experience and knowledge to solve the problems by myself even with google.

  So i need an advice how can i solve the problem, just to know right direction.
  Thank you for your time.
  Sorry for my English.

• Node.js child_process TypeError : Cannot read property '_writableState' of undefined

  15 mai 2018, par functorial

  I am trying to wrap a piece of ffmpeg’s functionality in a Node.js API, using the child_process library, but when I attempt to send any data to ffmpeg’s stdin pipe, I get an error TypeError: Cannot read property '_writableState' of undefined.

  import {spawn} from "child_process"
  
  
  
  export default frames => {
  
      // Spawn ffmpeg process
  
      const ffmpeg = spawn("ffmpeg", ["-f", "image2pipe", "-i", "-", "output.mkv"])
  
      // Send frames to ffmpeg as stdin
  
      frames.forEach(ffmpeg.stdin.write)
  
  
  
      // Listen for output and errors
  
      return new Promise((resolve, reject) => {
  
          const chunks = []
  
  
  
          ffmpeg.stdout.on("data", chunks.push)
  
          ffmpeg.stderr.on("data", reject(data))
  
          ffmpeg.on("close", code =>
  
              resolve(Buffer.concat(chunks))
  
          )
  
      })
  
  }

  Error :

  TypeError: Cannot read property '_writableState' of undefined
  
      at Writable.write (_stream_writable.js:270:20)
  
      at Array.forEach (<anonymous>)
  
      at exports.default (/home/fiendfan1/workspace/nodejs/declare/dist/app/common/encodeVideo.js:21:12)
  
      at _callee$ (/home/fiendfan1/workspace/nodejs/declare/dist/app/tests/video.js:34:84)
  
      at tryCatch (/home/fiendfan1/workspace/nodejs/declare/node_modules/regenerator-runtime/runtime.js:65:40)
  
      at Generator.invoke [as _invoke] (/home/fiendfan1/workspace/nodejs/declare/node_modules/regenerator-runtime/runtime.js:303:22)
  
      at Generator.prototype.(anonymous function) [as next] (/home/fiendfan1/workspace/nodejs/declare/node_modules/regenerator-runtime/runtime.js:117:21)
  
      at Generator.tryCatcher (/home/fiendfan1/workspace/nodejs/declare/node_modules/bluebird/js/release/util.js:16:23)
  
      at PromiseSpawn._promiseFulfilled (/home/fiendfan1/workspace/nodejs/declare/node_modules/bluebird/js/release/generators.js:97:49)
  
      at Promise._settlePromise (/home/fiendfan1/workspace/nodejs/declare/node_modules/bluebird/js/release/promise.js:574:26)
  
      at Promise._settlePromise0 (/home/fiendfan1/workspace/nodejs/declare/node_modules/bluebird/js/release/promise.js:614:10)
  
      at Promise._settlePromises (/home/fiendfan1/workspace/nodejs/declare/node_modules/bluebird/js/release/promise.js:693:18)
  
      at Async._drainQueue (/home/fiendfan1/workspace/nodejs/declare/node_modules/bluebird/js/release/async.js:133:16)
  
      at Async._drainQueues (/home/fiendfan1/workspace/nodejs/declare/node_modules/bluebird/js/release/async.js:143:10)
  
      at Immediate.Async.drainQueues [as _onImmediate] (/home/fiendfan1/workspace/nodejs/declare/node_modules/bluebird/js/release/async.js:17:14)
  
      at runCallback (timers.js:696:18)
  
  </anonymous>

• How to create a Master Playlist for HLS using a Java wrapper library for FFMPEG

  17 janvier 2019, par Abhishek Nandgaonkar

  I am trying to find/use a Java Library that wraps around FFMPEG to create HLS compatible segments and metadata files along with a master metadata file.

  Most existing libraries perform encoding just fine and allow extra functions for additional audio/video parameters. But I could not find a good way for using them to create a master metadata file and other resolution/bandwidth/bitrate based metadata + segments.

  One way that I am planning to go about it is running the piece of code that performs HLS for me multiple times to suit the different bitrates and then programmatically look at the metadata files to compose the master metadata file. But that adds room for errors.

  If you know of an existing library that can do it for me. Please share the details. It would really help out.

  Libraries :

  • https://github.com/bramp/ffmpeg-cli-wrapper
  • https://github.com/hoary/JavaAV
  • https://github.com/kokorin/Jaffree
  • http://www.xuggle.com/

  Documentation (see Section Master Playlist)
  https://developer.apple.com/library/content/referencelibrary/GettingStarted/AboutHTTPLiveStreaming/about/about.html

  FFMPEG command line code that works for me

  ffmpeg -loglevel debug -threads 4 -vsync 1 -i 'id.mp4' -vf yadif -g 29.97 -r 29.97 -b:v:0 5250k -c:v libx264 -rc:v vbr_hq -pix_fmt yuv420p -profile:v main -level 4.1 -rc-lookahead 32 -forced-idr 1 -b:v:1 4200k -c:v libx264 -rc:v vbr_hq -pix_fmt yuv420p -profile:v main -level 4.1 -rc-lookahead 32 -forced-idr 1 -b:v:1 3150k -c:v libx264 -rc:v vbr_hq -pix_fmt yuv420p -profile:v main -level 4.1 -rc-lookahead 32 -forced-idr 1 -b:a:0 256k -b:a:0 192k -b:a:0 128k -c:a aac -ar 48000  -map 0:v -map 0:a:0 -map 0:v -map 0:a:0 -map 0:v -map 0:a:0 -f hls -var_stream_map "v:0,a:0  v:1,a:1 v:2,a:2" -master_pl_name  master.m3u8 -t 300 -hls_time 10 -hls_init_time 4 -hls_list_size 0 -master_pl_publish_rate 10 -hls_flags delete_segments+discont_start+split_by_time "vs%v_manifest.m3u8"

  Any help would be appreciated. Thanks in advance.