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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 ?)

• Seeing Blank video when using Xvfb with ffmpeg in headless mode

  4 avril 2022, par sxg

  Seeing blank video while running protractor tests in headless mode using Xvfb, ffmpeg, protractor video reporter

  



  I am using protractor framework for running automation tests. I am using protractor video recorder tool to record video on headless mode. The prerequisite for that is to start Xvfb at the background.

  



  This the setting i am using to run test in headless mode.
Steps followed to enable video in headless mode :

  



  Installed "npm i protractor-video-reporter"
Included ffmpeg setting for docker/linux.
```
 var VideoReporter = require('protractor-video-reporter');
 jasmine.getEnv().addReporter(new VideoReporter({
    baseDirectory: 'reports/videos',
    singleVideo: false,
    saveSuccessVideos: true,
    ffmpegCmd: '/usr/bin/ffmpeg',
    ffmpegArgs: [
      '-y',
      '-r', '30',
      '-f', 'x11grab',
      '-s', '1280x1024',
      '-i', 'process.env.DISPLAY',
      '-g', '300',
      '-vcodec', 'mpeg4'
    ]
  }));


  



      Executed "Xvfb :99 -ac -screen 5 1024x768x8 -listen tcp &" in a terminal
    Executed ```
       DISPLAY=:99  
       export $DISPLAY
``` in a separate window 
    Executed "env DEBUG=protractor-video-reporter protractor conf.js" in a separate terminal

Expected Result:

A video with the recordings that runs tests on google chrome

Actual Result:

Video is getting created but the video appears to be blank.

Chrome Version:73
Chromedriver Version: 2.46
Protractor version:5.4.2


  


• How to share video stream to WSL2 while ffmpeg ? [closed]

  27 octobre 2024, par 笑先生

  Most solutions for using a camera in WSL are to build your own WSL kernel. I have realized it with the steps mentioned in Capturing webcam video with OpenCV in WSL2

  


  However, it's complicated and time-consuming. I want to realize it by sharing video streaming.

  


  Share method

  


  Step1 : Run the command below on Windows to check all the camera devices. I see an integrated camera "Integrated Webcam" (video) in the output.

  


  ffmpeg -list_devices true -f dshow -i dummy


  


  Step2 : Check the IP of Ethernet adapter vEthernet (WSL). In my computer, it's 172.24.176.1

  


  Step3 : Run the command below on Windows to share video streaming.

  


  ffmpeg -f dshow -i video="Integrated Webcam" -preset ultrafast -tune zerolatency -vcodec libx264 -f mpegts udp://172.24.176.1:5000


  


  Test

  


  Run the command to play the video streaming : ffplay udp://172.24.176.1:5000

  


  It can show the video when the command is run with a terminal of Windows (Win10).

  


  But, it cannot show anything when the command is run on with a terminal of WSL (Ubuntu 22.04). Why ?