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• FFmpeg film grain

  21 août 2019, par Some1Else

  I want to add a film grain effect using FFMPEG if possible.

  Taking a nice clean computer rendered scene and filter for a gritty black and white 16mm film look. As an example something like Clerks https://www.youtube.com/watch?v=Mlfn5n-E2WE

  According to Simulating TV noise Ishould be able to use the following filter

  -filter_complex "geq=random(1)*255:128:128;aevalsrc=-2+random(0)"

  but when I add it to my ffmpeg command

  ffmpeg.exe -framerate 30 -i XYZ%05d.PNG -vf format=yuv420p -dst_range 1 -color_range 2 -c:v libxvid -vtag xvid -q:v 1 -y OUTPUT.AVI

  so the command is now

  ffmpeg.exe -framerate 30 -i XYZ%05d.PNG -vf format=yuv420p -dst_range 1 -color_range 2 -c:v libxvid -vtag xvid -q:v 1 -y -filter_complex "geq=random(1)*255:128:128;aevalsrc=-2+random(0)" OUTPUT.AVI

  I get the message

  Filtergraph ’format=yuv420p’ was specified through the -vf/-af/-filter option for output stream 0:0, which is fed from a complex filtergraph.
   vf/-af/-filter and -filter_complex cannot be used together for the same stream.

  How can I change my ffmpeg command line so the grain filter works ? Additionally, can I add a slight blur too ? The old 16mm looks more like blurred then grainy.

  Thanks for any tips.

• Making youtube-dl download mp3's faster

  12 novembre 2017, par sciencelord

  It takes a long time to download mp3 songs using youtube-dl, and it takes even longer when downloading a bunch of mp3 songs. Is there a way to make it significantly faster ? I don’t mind reducing quality. I’ve been using the command below.

  youtube-dl --extract-audio --audio-format "mp3" --output "%(title)s.%(ext)s" "https://www.youtube.com/watch?v={videoid}

  I also took a look at this post :
  ffmpeg command for faster encoding at a decent bitrate with smaller file size

  But I wasn’t sure how to change the above command using the ffmpeg modifications.

  Thanks !

• Ffmpeg stream rtsp via h264 with low quality

  9 novembre 2017, par dscsdc

  When i stream rtsp with ffmpeg via upd i got lot of errors of error while decoding MB 48 31, bytestream. and i see the video with low quality.

  I stream with ffmpeg according to this command :ffmpeg -i rtsp://x.x.x.x/... http://y.y.y.y:zzzz

  On this way I send the data to ffserver and then I can watch the video via ffplay or vlc according to url :rtsp://w.w.w.w:(port)/live.h264
  (I have ffserve conf that stream to h264 file).

  When i stream via rtsp tcp all is fine, and i see the video well. but when i stream with rtsp udp i got video with very low quality, freezes or gets stuck.

  I want to understand 2 stuff :

  1. I know that udp is less reliability then tcp, but when i watch on stream from another streaming via rtsp udp i see the video with much more quality.
     is ffmpeg has a problem to stream udp or is that because i stream h264 with rtsp udp.
     What can i do to improve performance of ffmpeg with rtsp udp ?

  2. What does it matter witch type of file i stream (on rtsp udp) if this will be h264 or avi or mp4 or ffm or amp ?
     i see lot of streaming that stream amp , and another that streaming h264