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• converting complex ffmpeg command to python3

  14 janvier 2020, par 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 ?)

• Converting multiple RTP Streams into gRPC Stream

  20 janvier 2020, par 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.

• Mute parts of Wave file using Python/FFMPEG/Pydub

  20 avril 2020, par Adil Azeem

  I am new to Python, please bear with me. I have been able to get so far with the help of Google/StackOverflow and youtube :). So I have a long (2 hours) *.wav file. I want to mute certain parts of that file. I have all of those [start], [stop] timestamps in the "Timestamps.txt" file in seconds. Like this :

  



     0001.000 0003.000
   0744.096 0747.096
   0749.003 0750.653
   0750.934 0753.170
   0753.210 0754.990
   0756.075 0759.075
   0760.096 0763.096
   0810.016 0811.016
   0815.849 0816.849


  



  What I have been able to do is read the file and isolate each tuple. I have just output the first tuple and printed it to check if everything looks good. It seems that the isolation of tuple works :) I plan to count the number of tuples (which is 674 in this case) and put in a 'for loop' according to that count and change the start and stop time according to the tuple. Perform the loop on that single *.wav file and output on file with muted sections as the timestamps. I have no idea how to implement my thinking with FFMPEG or any other utility in Python e.g pydub. Please help me.

  



     with open('Timestamps.txt') as f:
   data = [line.split() for line in f.readlines()]
   out = [(float(k), float(v)) for k, v in data]

   r = out[0] 
   x= r[0]
   y= r[1]
   #specific x and y values
   print(x)
   print(y)