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• How to combine multiple images horizontally and vertically using ffmpeg [duplicate]

  7 février 2020, par user3625087

  I’m attempting to create a script that can stitch together images side by side. These images are basically letters that I want to create words with (think of those ransom letters in Hollywood movies with randomly cut out letters from magazines). I need to specifically use these images, so I don’t want ffmpeg to type out some words into images itself. I’ve seen some similar answers using hstack and tile filter complexes but those didn’t work for me. Here is what I’ve tried so far :

  ffmpeg -pattern_type glob -i h.png -i e.png -i l.png -i l.png -i o.png -filter_complex tile=5x1 test.png

  For this one, -pattern_type didn’t exist as an option (I’m using ffmpeg 4.2 on Windows), so I removed it and the result was 1 letter and black space for the rest.

  ffmpeg -y -i h.png -i e.png -i l.png -i l.png -i o.png -filter_complex hstack test.png

  For this one, the result was 2 letters side by side, and then black space for the rest.

  All of my images are of the same height and variable width. Is there a command that can achieve this ?

• Redirect FFMPEG's output to multiple named pipes on Windows

  27 août 2024, par tearvisus

  I am trying to stream video and audio data into two separate named pipes on Windows.

  



  ffmpeg.exe -f dshow -i video="My camera name":audio="My microphone name" -map 0:1 -ac 1 -f f32le \\.\pipe\audioStream -map 0:0 -f mjpeg \\.\pipe\videoStream


  



  The problem is that FFMPEG does not seem to understand that the outputs \\.\pipe\audioStream and \\.\pipe\videoStream are pipes and treats them like files.

  



  

  1. If the pipes are already created when the FFMPEG starts, it wants to overwrite them and fails.

  


  2. Otherwise, it complains that the path does not exist and fails.

  


  



  As far as I understand, specifying the pipe: protocol should do the trick, but I can't figure out how to use it properly, even with a single pipe. I have tried :

  



  

  1. pipe:pipeName

  


  2. pipe:pipe\pipeName

  


  3. pipe:\\.\pipe\pipeName

  


  4. pipe://pipeName

  


  5. pipe://pipe\pipeName

  


  6. pipe://\\.\pipe\pipeName

  


  



  I always end up with the same result : the output is written to the console and not to the pipe. If the pipe already exists when the FFMPEG starts, nothing connects to the pipe.

  



  Is it possible to use FFMPEG with named pipes on Windows ? If yes, what is the proper way to do this ?

  


• How do you determine the end of the file in a stream containing multiple streams ? (nodejs)

  26 décembre 2019, par Danielkent

  I would like to split an audio file into multiple segments using ffmpeg in an AWS Lambda (NodeJS) function.

  Due to the limitations of (and to optimise for) the lambda environment I would like to stream the audio into ffmpeg, perform the split on the audio file in the stream and then stream the now multiple smaller files out to s3.

  After doing some research I have found the AWS S3 SDK doesn’t support multiple file uploads in one stream. I could resolve this by finding the end of each new segment (file in the output stream) and creating a separate upload to s3.

  Is there a way to determine the end of a file in a stream (containing multiple files) ?

  (without saving it to the file system or loading it to memory).

  I have searched around and I can’t seem to find an answer.