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• Error : No such filter : '"movie', what's the isssue ?

  16 mars 2019, par uno

  I am using the code to add watermarks to videos on upload for carrierwave-video :

  process encode_video: [:mp4, resolution: "640x480", watermark: {
  
      path: "app/assets/images/logo-nike.jpg",
  
      position: :bottom_right,
  
      pixels_from_edge: 10
  
    }]

  When i use this code, i get error :

  (in short)

  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
  
    Stream #0:1 -> #0:1 (aac (native) -> aac (native))
  
  Press [q] to stop, [?] for help
  
  [AVFilterGraph @ 0x55c8909bf180] No such filter: '"movie'
  
  Error reinitializing filters!
  
  Failed to inject frame into filter network: Invalid argument
  
  Error while processing the decoded data for stream #0:0
  
  Conversion failed!
  
  ):

  my ffmpeg version is 4.1.1

  Is there something missing from ffmpeg i need to install ? I have looked around and found no issues with others using this code (most posts are years old though)

  I found this : No such filter : ’drawtext’

  but isn’t the same thing ?

• I am trying to use the IMA audio encoder and all I get is silence (warning:noob !)

  9 avril 2019, par TerryYim

  o internet !

  As the tree said to the lumberjack, I’m stumped. I downloaded ffmpeg for the first time today and have had quite a lot of fun experimenting with it. So far, I’ve managed to get videos encoded and playing on my Mac OS 9 installation (in Quicktime) using the ’svq1’ video encoder and 16 bit pcm audio. I use this command :

  .\ffmpeg.exe -i .\cat.mp4 -vcodec svq1 -acodec pcm_s16le -ar 44.1k -ac 2 cat_cmon.mov

  However, when I try to switch the audio to adpcm_ima_qt (which I believe is what I should be using for Quicktime 4 - bear in mind that this software is 20 years old) all I get is silence. However, I’m getting silence when I try to play them in Windows too, so I know it’s not the Mac that’s at fault. Here’s what I’m trying to use :

  .\ffmpeg.exe -i .\rivalries.mp4 -vcodec svq1 -acodec adpcm_ima_qt -ar 44.1k -ac 2 rival.mov

  So I’m totally stumped. Am I doing something wrong ? If I am, it’s not something I can see myself. Would anyone be able to lend some wisdom as to how to get the IMA-encoded audio working ?

  Thank y’all !

  ADI.

  Edit : And, just to explain, the reason I want to use adpcm_ima_qt is because PCM is laggy and results in larger file sizes.

• Getting motion vector side data from ffmpeg from the compressed domain (without performing full decode)

  4 mai 2019, par John Allard

  The ffmepg source code comes with a file extract_mvs.c which is quite helpful in showing how to extract the motion vectors from an h264-encoded video file. Unfortunately, it performs a full decode before getting the motion vectors from the side data of the stream.

  One should be technically able to (as was confirmed by FFMPEG developer Carl Eugen in this thread https://ffmpeg.org/pipermail/libav-user/2016-December/009913.html) get the motion vectors from the compressed domain before performing a full decode step. This would obviously be less computationally intensive as one wouldn’t have to perform a full decode.

  Is it possible to do this with ffmpeg/libavcodec as is ? I know Carl said that it wasn’t possible but that was 3 years ago. If it is not currently possible, does anyone have any hints on how one would go about modifying the ffmpeg source code to do this ?

  Thanks