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• ffmpeg filters order rotate scale with overlay

  13 décembre 2017, par Sebastián Márquez Lutfy

  I’m trying to render an image over a video. I use the following command after some research

  ffmpeg -y  -i "my_video.mp4" -i "my_image.jpg" -filter_complex "color=color=blue:size=711x400:rate=25[container];[0:v]scale=w=400:h=400,setpts=expr=PTS-STARTPTS[vidscaled];[container][vidscaled]overlay=eval=init:shortest=1:x=155:y=0[overlay0];[1:v]scale=w=123:h=123,rotate=a=323.7*PI/180:c=black@0:oh='roth(323.7*PI/180)':ow='rotw(323.7*PI/180)':bilinear=1[imgproc];[overlay0][imgproc]overlay=eval=init:x=18:y='237-abs(123*sin(323.7*PI/180))'[overlay1]" -map "[overlay1]" -map 0:a -strict -2 -preset ultrafast -g 120 output.mp4

  The problem with this approach is a low image’s quality since scaling is applied before rotate. So i tried to apply the rotation before scaling, (see next command)

  ffmpeg -y  -i "my_video.mp4" -i "my_image.jpg" -filter_complex "color=color=blue:size=711x400:rate=25[container];[0:v]scale=w=400:h=400,setpts=expr=PTS-STARTPTS[vidscaled];[container][vidscaled]overlay=eval=init:shortest=1:x=155:y=0[overlay0];[1:v]rotate=a=323.7*PI/180:c=black@0:oh='roth(323.7*PI/180)':ow='rotw(323.7*PI/180)':bilinear=1,scale=w=173:h=173[imgproc];[overlay0][imgproc]overlay=eval=init:x=18:y='237-abs(123*sin(323.7*PI/180))'[overlay1]" -map "[overlay1]" -map 0:a -strict -2 -preset ultrafast -g 120 output.mp4

  And the problem : c=black@0 is not working anymore, the bounding box around the rotated image is not transparent.

  Anyone please help this soul.

  pd : Using c=none doesn’t work too, got a green background

• Memory issues when using ffmpeg and gloss to play videos

  21 décembre 2015, par Noughtmare

  I’m trying to make a video player with haskell using ffmpeg-light, JuicyPixels and gloss. I’m now able to play video, but frames that have been played stay in memory. This causes major memory issues. How can I avoid storing all the frames in memory ?

  Here is my code :

  {-# LANGUAGE FlexibleContexts #-}
  
  module Main where
  
  
  
  -- For my own 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 (when, join)
  
  import Codec.FFmpeg.Decode
  
  import Codec.FFmpeg.Enums
  
  import Control.Monad.Error.Class
  
  import Control.Arrow (first)
  
  import Control.Monad.Except (runExceptT)
  
  import Graphics.Gloss.Interface.IO.Animate
  
  import Data.IORef
  
  
  
  -- Temporary hardcoded resolution
  
  resolution :: (Int,Int)
  
  resolution = (640, 360)
  
  
  
  main :: IO ()
  
  main = do
  
      -- First initialize ffmpeg, this needs to be run before other ffmpeg functions
  
      initFFmpeg
  
      -- Open the samplevideo for reading. video :: IO (IO (Maybe (AVFrame, Double)), IO ())
  
      video <- runExceptT $ frameReaderTime' avPixFmtRgb24 "SampleVideo_640x360_1mb.flv"
  
      either
  
            -- This code gets called when the frameReader reports an error
  
            (const $ putStrLn "Can't read file")
  
            -- This opens a new window and plays the video in it on a white background
  
            (animateFixedIO (InWindow "Nice Window" resolution (10, 10)) white . frameAtWait . fst)
  
  
  
            video
  
  
  
  -- This finds the frame at given time
  
  frameAtWait :: IO (Maybe (AVFrame, Double)) -> Float -> IO Picture
  
  frameAtWait getFrame time = do
  
      -- This gets the next frame from the video
  
      (frame, t) <- fromJust <$> getFrame
  
      -- t has to be converted from Double to Float
  
      let t' = realToFrac t
  
          -- The difference between the requested time and the actual frame time
  
          difference = t' - time
  
      -- If the frame is not yet supposed to be shown
  
      if difference > 0 then do
  
          -- Wait until it is
  
          threadDelay . round . (* 1000000) $ difference
  
          -- then return it
  
          fromJust <$> frameToPicture frame
  
      else
  
          -- return it immediately
  
          fromJust <$> frameToPicture frame
  
  
  
  -- This function converts a ffmpeg internal AVFrame to a gloss picture
  
  frameToPicture :: AVFrame -> IO (Maybe Picture)
  
  frameToPicture frame = do
  
      -- convert it to a juicypixels dynamicimage
  
      dynImage <- toJuicy frame
  
      -- then convert it to a gloss picture and return it
  
      return . join $ fmap fromDynamicImage dynImage

• ffmpeg can't record Webview Edge in window form

  20 juin 2021, par Sôn Gô Ku

  I have a window form application with browser control is Webview Edge as link bellow :
https://docs.microsoft.com/en-us/microsoft-edge/webview2/get-started/winforms

  


  This command use for record tab :
ffmpeg -f gdigrab -framerate 60 -i title="xo" -y -b:v 10M a.mp4
p\s : "xo" is window form title

  


  But after record, video doesn't have webview control
Please see attached image

  


  Please help me this case. Thank you so much !