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• Converting multiple RTP Streams into gRPC Stream

  20 January 2020, by GJ.

  I am receiving multiple RTP streams(g711 ulaw/alaw) which may be coming on TCP or UDP, I want to terminate the RTP and get the raw media from the RTP stream and stream it to a different destination by using Google gRPC protocol.

  Currently I have a RTP processing engine which does this and give me the raw stream from RTP stack which i further stream to gRPC destination, but this solution does not scale beyond 1000 streams on one host and is difficult to maintain.

  I want to replace this with some highly scalable solution where i can scale to several thousand of streams and does not need to be maintained.

  I am exploring option to Use ffmpeg / gstreamer for getting raw packets from RTP stream. Not sure how scalable it would be and how do i get hold of the stream so that i can stream it over gRPC.

  I have following questions:

  1. Is this good option to use ffmpeg / gstreamer for this purpose.
  2. How do i work with multiple streams any suggestions or sample.
  3. Any details about the scalability of ffmpeg / gstreamer.
  4. I plan to use Java for my application, which java wrapper would be good e.g. Xuggle / ffmpeg-cli-wrapper for ffmpeg.

• converting complex ffmpeg command to python3

  14 January 2020, by Martin

  I have a complicated ffmpeg command that takes audio and image as input, and exports a music video.

  ffmpeg -loop 1 -framerate 2 -i "front.png" -i "testWAVfile.wav" \
  
      -vf "scale=2*trunc(iw/2):2*trunc(ih/2),setsar=1,format=yuv420p" \
  
      -c:v libx264 -preset medium -tune stillimage \
  
      -crf 18 -c:a aac -shortest -vf scale=1920:1080  "outputVideo.mp4"

  I’m trying to write a python3 program cmdMusicVideo.py which will run this command in pure Python. I know that to run this command you need the ffmpeg program, I’m trying to write it in pure python3, where I’m not just spawning a separate process to run the bash command where the user needs to have ffmpeg installed.

  I’ve looked at the various solutions to running ffmpeg in python3, and they’re either:

  • A: Just running the ffmpeg command as a subprocess, where the user needs to have ffmpeg installed
  • or B: An ffmpeg pip program like ffmpeg-python

  The pip libraries I’ve checkout out all use incredibly different formatting, and I haven’t found a way to replicate my ffmpeg command. I’ve searched the loop command in their python package documentation and it doesn’t appear anywhere.

  Is there a way to convert my ffmpeg command into a python3 program where the user doesn’t need to already have ffmpeg installed on their computer?

  The plan is to eventually turn this into its own pip package, and my concern is that if I use the A method, there would be a case where somebody tries to run my pip command but doesn’t have ffmpeg installed on their terminal (maybe using a python3 specific terminal?)

• How to link the ffmpeg transcoding process information into a vb6 GUI app?

  19 December 2019, by melaos

  i’m playing with a vb6 gui frontend for ffmpeg and as of now all i can do is to call the ffmpeg via cmd.exe which will shows the command prompt while the whole process is still running. And i thought this was the norm seeing how WinFF, another pascal based frontend gui for ffmpeg works.

  But i was blown away when i saw this other GVC gui which has a progress bar and everything.

  So basically, i’m looking into a way how i could cleanly hide the whole command prompt and link the transcoding progress to a progress bar into my gui.

  So here’s my plan, I’m thinking of finding a win32 api function which i can call the cmd line and yet hide it, and from another discussion here, i think i would have to read the log file to get the ffmpeg progress information.

  So which function should i call for the win32 api?
  And does anyone knows of a better/easier way to get this done?
  thanks

  Updates:

  In case anybody is interested, i find a nice class module on how to grab the cmd output into my vb6 app, and it’s by none other than the great joacim :)