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• Can't find ffmpeg folder error

  2 janvier 2016, par beekeeper

  I am trying to download music from youtube and convert the downloaded .mp4 to .mp3 however I keep getting

  Error : ffmpeg exited with code 1 : ./songs/Battle-Scars.mp4 : Invalid data found when processing input

  Here is the code

  var proc = new ffmpeg({ source: './songs/Battle-Scars.mp4'})
  
    .withAudioCodec('libmp3lame')
  
    .toFormat('mp3')
  
    .saveToFile('./songs/Battle-Scars.mp4', function(stdout, stderr) {
  
      console.log('file has been converted succesfully');
  
    });

  The youtube -> mp4 conversion works fine, The error is only occurring when I try to convert to mp3. I appreciate all the
  help and thanks in advance !

  Edit : Once I added ffmpeg to bash_profile it worked. Thanks for all the help !

• 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

• Unable to find a suitable output format for ' -filter_complex' -filter_complex : Invalid argument for FFMPEG Terminal

  18 août 2023, par heroZero

  This is what I am trying :

  


  ffmpeg -i crop-1.mp4 -i crop-2.mp4 -i crop-2.mp4 -i crop-3.mp4 \ -filter_complex \ "[0:v][1:v]hstack=inputs=2[top] ;\ [2:v][3:v]hstack=inputs=2[bottom] ;[top][bottom]vstack=inputs=2[v]" \ -map "[v]" \ output.mp4