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• Install graphicsmagik and ffmpeg for nodeJS application running as docker container

  25 septembre 2017, par user3142695

  I am deploying a nodeJS application (which is based on meteorJS and build with meteor build) to a docker container on my ubuntu 16.04 server.
  My application needs graphicsmagick and ffmpeg.
  As far as I know, the ffmpeg should be in the libav-tools package.

  My question is how do I get those two needed packages into my application running as docker container ?

  I think it is wrong to install them via apt-get graphicsmagick on the server itself, right ?

  For this nodeJS application I’m using this Dockerfile to create a docker image :

  FROM node:4.8-slim
  
  
  
  # Copy the application files
  
  COPY . /
  
  
  
  # Set required environment variables
  
  ENV NODE_ENV production
  
  ENV MONGO_URL mongodb://mongo:27017/
  
  ENV ROOT_URL http://localhost
  
  ENV PORT 80
  
  EXPOSE 80
  
  
  
  # Download the required packages for production
  
  RUN (cd programs/server && npm install --silent)
  
  
  
  # Make the application run when running the container
  
  CMD ["node", "main.js"]

  My application uses this package.json :

  {
  
    ...
  
    "dependencies": {
  
      ...
  
      "ffmpeg": "0.0.4",
  
      "fluent-ffmpeg": "^2.1.2",
  
      "gm": "^1.23.0",
  
      ...
  
    }
  
  }

  Running npm install should add gm and ffmpeg, but I think I need those packages installed in the docker container itself.

• ffmpeg muxing 6 mono wavs and prores mov into new 6 channel mov - how to ?

  23 octobre 2017, par BabaG

  i’ve been dealing with this for a day now and finally have to just come out and ask. i want to take a prores mov file that is silent (but apparently does have a timecode track) and losslessly mux it with 6 mono wav files, having the 6 mono wavs become 6 uncompressed channels (not 6 streams) in the final mov.

  how do i do this ?

  the attempts i’ve made have all failed in some way or other. either i get a conflict where a filter is employed which prevents a direct copy, or i get an error in mapping, or something else. i’ve seen lots on working with either a single audio channel and picture but nothing on muxing 5.1 with picture. either that or there is transcoding being done but not straight copying. also found a lot on extracting but nothing much on combining.

  here’s the last command i tried, which gave me an aac audio track with the correct number of channels but, obviously, was not just a copy of the uncompressed wavs :

  ffmpeg -i pix.mov -i L.wav -i R .wav -i C.wav -i LFE.wav -i Ls.wav -i Rs.wav -filter_complex "[1:a][2:a][3:a][4:a][5:a][6:a]amerge=inputs=6[aout]" -map "[aout]" -c:v copy -c:a copy muxed51.mov

  this threw the error that -filter_complex is incompatible with -c:a copy, which makes sense now that i’ve seen it. without the -c:a copy switch i got an mp4 mov with no picture and aac audio. i think i tried it also with the -filter_complex parameters running from 0-5 rather than the 1-6 as they are here. i think i was trying to leave room for the video stream to copy into the 0 space. obviously not a coder here. i just need to get this done and it seemed like it should be pretty simple. not turning out that way.

  to sum up, how do i just copy the video and 6 mono wavs into a mov container with the audio as 6 channels ? both picture and audio should be lossless copies.

  thanks,
  BabaG

• Concatenate multiple videos with a black screen loop into one video

  21 mars 2016, par AHC

  I am using ffmpeg to join a bunch of videos together.
  I am using the classic join ffmpeg code :
  

  ffmpeg -f concat -i joinlist.txt -c copy joinedfile.mp4

  but the problem is that the videos are of different formats, encodings, but the same size : all 640x480. I want to join them all and put a black screen video with no sound every other video :

  video1 + black_screen_video + video2 + black_screen_video + video3 ...

  I generated a black screen video of 2 seconds duration using :

  ffmpeg -f lavfi -i color=c=black:s=640x480:d=2 black_screen_video.mp4

  so all of the videos are of the same size : 640x480, and 25 fps but different codecs. The videos have sound, except for the black screen video.
  I can’t do anything manual, because the number of videos are around several hundred. So it has got to be an automatic way to do all this.

  When I joined them together using the above code, the resulting video does not play correctly at all.

  I know that I have to re-encode them, but how to do this to all these videos at once, with one line of code ?

  Update :
  I am already using with success this code to join them together, but only three, if I have more than one hundred, it is time consuming to write down one by one :

  ffmpeg -i vid1.avi -i vid2.avi -i vid3.avi -filter_complex "[0:v:0] [0:a:0] [1:v:0] [1:a:0] [2:v:0] [2:a:0] concat=n=3:v=1:a=1 [v] [a]" -map "[v]" -map "[a]" output.mp4

  but this is joining only the videos, not looping the black screen video. When I do with black screen, ffmpeg gives me stream matching errors.

  update :

  here is the console image :
  

  2nd update :

  a very long list of errors in red, of which a screenshot here :