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• ffmpeg Ghosting between RGB color channels [closed]

  24 mai 2024, par Blikpils

  This seems like a very specific question so i hope there is someone who can help me out.
Within FFMPEG i am trying to add (channel pack) 3 different grayscale videos in RGB within a webm or mp4 video. I got it to work to a degree via Merge planes.
This is what i tried :

  


  ffmpeg -y -i video1.webm -i video2.webm -i video3.webm -filter_complex "[0:v]format=gray[r]; [1:v]format=gray[g]; [2:v]format=gray[b]; [g][b][r]mergeplanes=0x001020:format=gbrp" -pix_fmt yuv420p -t 00:00:03 output.webm


  


  This is the result :


  


  As you see the 9 is visible in the red and blue channel and so are each of the other channels

  


  I have tried just extracting a single channel in a video, change the compression change the format change the color space, make sure that its all linear but each seem to have the limitation of some smearing/artifacts between the other channels.

  


  Is it at all possible to add different grayscale streams in the color channels without any artifacts and if so in which direction should i look ?

  


  Any help would be greatly appreciated !

  


• How to install FFMPEG on Docker Image ? [closed]

  20 avril 2023, par BS Kim

  I'm working on an m1 MacBook.

  


  I have to make it into a docker image this time, but FFMPEG keeps getting in trouble.

  


  FROM openjdk:17-oracle
ENV APP_HOME=/Users/username/Documents/coding/
WORKDIR $APP_HOME
COPY build/libs/\*.jar application.jar
RUN apk add  --no-cache ffmpeg
EXPOSE 8080

CMD ["java", "-jar", "application.jar"]



  


  I set Dockerfile as above, but both apt-get and apk have command not file errors.(Not when building docker)

  


  How can I install or use FFMPEG inside my docker imgae ?

  


  I tried

  


  RUN apk add  --no-cache ffmpeg


  


  and

  


  RUN apt-get -y update
RUN apt-get -y upgrade
RUN apt-get install -y ffmpeg


  


  but neither works.

  


• How to tell if faststart for video is set using ffmpeg or ffprobe

  5 septembre 2022, par jsherk

  I am having trouble figuring out how to determine if faststart is set on an MP4 video.

  



  I understand that "moov atom" is the data that needs to be located at the beginning of the file for faststart to be enabled, instead of at the end of the file.

  



  I specifically want to use ffmpeg or ffprobe to determine if it has been moved to the beginning or not already.

  



  On a side note, I understand I can run the following command to move it from the end to the beginning (but I want to find out if it is already there) :

  



  ffmpeg -i infile.mp4 -map 0 -c:v copy -c:a copy -c:s copy -c:d copy -c:t copy -movflags +faststart outfile.mp4