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• FFMPEG Encoding in Multiple resoultions for adaptive streaming

  9 janvier 2020, par thatman

  I am using the following ffmpeg script for encoding mp4 video into different resolutions for adaptive HLS/DASH streaming :

   ffmpeg -y -nostdin -loglevel error -i INPUT.mp4 \
  
      -map 0:v:0  -map 0:v:0 -map 0:v:0  -map 0:v:0  -map 0:v:0  -map 0:v:0 -map 0:a\?:0  \
  
      -maxrate:v:0 350k -bufsize:v:0 700k -c:v:0 libx264 -filter:v:0 "scale=320:-2"  \
  
      -maxrate:v:1 1000k -bufsize:v:1 2000k -c:v:1 libx264 -filter:v:1 "scale=640:-2"  \
  
      -maxrate:v:2 3000k -bufsize:v:2 6000k -c:v:2 libx264 -filter:v:2 "scale=1280:-2" \
  
      -maxrate:v:3 300k -bufsize:v:3 600k -c:v:3 libvpx-vp9 -filter:v:3 "scale=320:-2"  \
  
      -maxrate:v:4 1088k -bufsize:v:4 2176k -c:v:4 libvpx-vp9 -filter:v:4 "scale=640:-2"  \
  
      -maxrate:v:5 1500k -bufsize:v:5 3000k -c:v:5 libvpx-vp9 -filter:v:5 "scale=1280:-2"  \
  
      -use_timeline 1  -use_template 1 -adaptation_sets "id=0,streams=v  id=1,streams=a" \
  
      -threads 8 -seg_duration 5 -hls_init_time 1 -hls_time 5 -hls_playlist true -f dash OUTPUT.mpd

  But the script is giving this error :

  Only ’-vf scale=320:640’ read, ignoring remaining -vf options : Use ’,’ to separate filters
  Only ’-vf scale=640:1280’ read, ignoring remaining -vf options : Use ’,’ to separate filters
  Only ’-af (null)’ read, ignoring remaining -af options : Use ’,’ to separate filters

  Please help in resolving the issue. Thanks in advance !

• 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.

• 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 ?