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• ffmpeg hls output files - hosting on cdn and conflicting fileNamespaces

  24 avril 2018, par Robert Rowntree

  env - ffmpeg running on cloud
  ffmpeg outputs 2, tmp files < m3u8, binData.ts >

  CDN hosting means the cloud-temp files above need to be uploaded from temp FS on cloud host where ffmpeg is run to final CDN for media. This uploading changes the file names , breaking the fileRef contained in the .m3u8 pointing to ’binData.ts’

  Possible workaround -

  upload binData.ts to the CDN as a single, unacompanied file, wait for CDN response to this file POST , using the response with ’newPrefixCDN-binData.ts’ to run a SED-script editing the original .m3u8 < details on edit below >

  and then uploading the edited m3u8 to the CDN where it correctly points at its binData.ts.

  Im reluctant to code this workaround.

  Is there a better way of doing this ? like using some lib

  Details

  ffmpeg ... -hls_playlist_type vod -hls_segment_filename binData_%03d.ts my.m3u8
  
  
  
  #EXTM3U
  
  #EXT-X-VERSION:3
  
  #EXT-X-MEDIA-SEQUENCE:0
  
  #EXT-X-ALLOW-CACHE:YES
  
  #EXT-X-TARGETDURATION:10
  
  #EXTINF:10.000000,
  
  binData_000.ts

  but then uploading ’binData.ts’ to CDN results in name change to

  /S3-bucket/dd911142f64f-binData_000.ts

  and without an edit , the original m3u8 output from ffmpeg now points at nothing ??

  #EXT-X-TARGETDURATION:10
  
  #EXTINF:10.000000,
  
  binData_000.ts   ****  changed after upload to CDN, could be edited

  —PS—
  AFAIK .. native, mobile browsers and html5 syntax seem to want 2, related , static files on the CDN that preserve a line in .m3u8 pointing to the static dot-ts file...

  <video class="vjs-tech" tabindex="-1"><source src="https://s3.eu-west-2.amazonaws.com/mybucket/my.m3u8" type="application/x-mpegURL"></source></video>
  
  ...
  
  
  
      #EXT-X-TARGETDURATION:10
  
      #EXTINF:10.000000,
  
      {CDN-prefix}-binData_000.ts 
  
  
  
  ...

  static file in CDN of type ’.ts’ with the prefixed, CDN name above

  CDN-prefix-binData_000.ts

• How to find mp4 metadata with ffmpeg-light in haskell ?

  21 décembre 2015, par Noughtmare

  I’m using ffmpeg-light, JuicyPixels and gloss to display a video with Haskell. I want to find the metadata of videos I’m playing automatically, but I have not yet found a way to do so.

  I would like to access metadata like the resolution and the framerate of the video.

  Can you help me ?

  EDIT :

  I have tried your solution @CRDrost, but the video is now playing at 2x normal speed. I assume the function imageReaderTime is giving the wrong timestamps.

  EDIT 2 :

  The abnormal playing speed is a bug in the ffmpeg-light library. I’ve opened an issue at the github repository.

  My updated code :

  import Graphics.Gloss
  
  import Codec.FFmpeg
  
  import Codec.FFmpeg.Juicy
  
  import Codec.Picture
  
  import Control.Applicative
  
  import Data.Maybe
  
  import Graphics.Gloss.Juicy
  
  import Control.Monad
  
  -- import System.IO.Unsafe (unsafePerformIO)-- for debugging purposes
  
  
  
  resolution :: (Int,Int)
  
  resolution = (640, 360)
  
  
  
  frameCount :: Int
  
  frameCount = 100
  
  
  
  main :: IO ()
  
  main = do
  
      initFFmpeg
  
      (getFrame, cleanup) <- imageReaderTime "big_buck_bunny.mp4"
  
      frames <- replicateM frameCount $ nextFrame getFrame
  
      cleanup
  
      animate (InWindow "Nice Window" resolution (10,10)) white (frameAt frames)
  
  
  
  nextFrame :: IO (Maybe (Image PixelRGB8, Double)) -> IO (Picture, Float)
  
  nextFrame getFrame = mapSnd realToFrac . mapFst fromImageRGB8 . fromJust <$> getFrame
  
  
  
  frameAt :: [(Picture, Float)] -> Float -> Picture
  
  frameAt list time = fst . head . dropWhile ((< time) . snd) $ list
  
  
  
  mapFst :: (a -> c) -> (a, b) -> (c, b)
  
  mapFst f (a, b) = (f a, b) -- applies f to first element of a 2-tuple
  
  
  
  mapSnd :: (b -> c) -> (a, b) -> (a, c)
  
  mapSnd f (a, b) = (a, f b) -- applies f to the second element of a 2-tuple

• Youtube dl for python : set mp3 last modif date date

  24 janvier 2021, par Vladimir Tarasov

  I'm using Youtube-dl (and ffmpeg) in a python project.

  &#xA;

  The problem I have is that, on download, the downloaded file takes as default the youtube's release date of the video instead of the download date.

  &#xA;

  My youtube-dl options

  &#xA;

  ydl_opts = {
    'format': 'bestaudio/best',
    'outtmpl': path + urlToTitleYT(link) + '.mp3',
    'postprocessors': [{
        'key': 'FFmpegExtractAudio',
        'preferredcodec': 'mp3',
        'preferredquality': '320',
    }],
}


  &#xA;

  Which opt could i use in order to change the file last modification date to the download date ?&#xA;(Or do i have to edit it manually ?)

  &#xA;