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• ffmpeg / python script - is it actually doing anything ?

  13 août 2021, par Mark Cornbill

  I downloaded the following script - it is not my own work ; it came with another Python script which scans through a folder of Rocket League gameplay videos, looking for moments where a goal has been scored (using tesseract-OCR), and then logs the clip filename and frame into a csv file called "detected.csv".

  


  That part has all worked now I've figured it all out ! It is the second part, this script is supposed to read the "detected.csv" list of files and frame numbers, to then trim and create the new video clips and output them to a folder. The code looks like this :

  


  import ntpath
import os

detectedGoalList = []
f = open("detected.csv", "r")
for x in f:
    tup = x.replace("\"[", "").replace("]\"", "").split(", ")
    print(x)
    detectedGoalList.append([tup[0], tup[1]])


for dg in detectedGoalList:
    print(dg[0])
    input_file = "\"{}\"".format(dg[0].replace("'", ""))
    output_path = "../clips/" + ntpath.basename(dg[0]).replace("'", "").replace(
    ".mp4", "").replace("Rocket League®_", "").replace("Rocket League™_", "").replace("Rocket 
    League_", "") + ".clipped.mp4"
    start = (int(dg[1]) - int(30 * 10)) / 30
    if start < 0:
       start = 0
    end = (int(dg[1]) / 30) - 3
    duration = end - start

    os.system("ffmpeg -ss {} -i {} -t {} -c copy {}".format(start, input_file,
                                                        duration, output_path))


  


  The script runs instantly and returns no errors. It doesn't log anything to the terminal. It doesn't output any new clips. I have 5 mp4 files in the "clips" directory that match in the csv file exactly. The "detected.csv" file contains the following :

  


  "['K:/Gameplay Videos/Rocket League/goals/clips\\goal(2).mp4', 1750]"
"['K:/Gameplay Videos/Rocket League/goals/clips\\goal(28).mp4', 1200]"
"['K:/Gameplay Videos/Rocket League/goals/clips\\goal(3).mp4', 3350]"
"['K:/Gameplay Videos/Rocket League/goals/clips\\goal(4).mp4', 3050]"
"['K:/Gameplay Videos/Rocket League/goals/clips\\goal(5).mp4', 3500]"


  


  So I'm pretty sure that the final ffmpeg line is the culprit. I understand basic command line ffmpeg syntax but when it's part of Python code and variables I just can't figure it out. I see reference to the number "30" a lot - maybe the guy who wrote this had 30fps videos as his source (they were after all Playstation replays), I have 60fps videos. I've tried changing those numbers to 60 to no avail.

  


• Powershell script finishes after the first ffmpeg call

  25 mars 2014, par sk904861

  The following Powershell script only executes the first ffmpeg call, no matter which one is first. Both the ffmpeg and the powershell processes never finish. Stopping the server, however, leads to the processes finishing and suddenly the second picture also appears.

  Param($InputFile, $OutputFile, $Thumbnail, $Sprites)
  
  
  
  $ThumbnailWidth = 120
  
  $ThumbnailHeight = 120
  
  
  
  # Thumbnail
  
  ffmpeg -i $InputFile -f image2 -vframes 1 -filter:v "crop=min(iw\,ih):min(iw\,ih), scale=$($ThumbnailWidth):$($ThumbnailHeight)" -crf 18 "$($Thumbnail)\150x150.png"
  
  
  
  # Poster
  
  ffmpeg -i $InputFile -f image2 -vframes 1 -filter:v "crop=min(iw\,ih):min(iw\,ih), scale=$($PosterWidth):$($PosterHeight)" -crf 18 "$($Thumbnail)\1000x1000.png"

  The script gets called within an ASP.NET application as follows :

  ProcessStartInfo startInfo = new ProcessStartInfo();
  
  startInfo.FileName = "powershell.exe";
  
  startInfo.Arguments = String.Format("-executionpolicy RemoteSigned -file \"{0}\" \"{1}\" \"{2}\" \"{3}\" \"{4}\"", scriptPath, fullPath, videoPath, thumbnailPath, sprites);
  
  startInfo.RedirectStandardOutput = true;
  
  startInfo.RedirectStandardError = true;
  
  startInfo.UseShellExecute = false;
  
  startInfo.CreateNoWindow = true;
  
  Process process = new Process();
  
  process.StartInfo = startInfo;
  
  
  
  process.EnableRaisingEvents = true;
  
  process.Exited += delegate
  
  {
  
       // Do some cleaning up
  
  };
  
  
  
  process.Start();

  Does anyone have a clue, why only the first the two ffmpeg calls is working, while each call seems to be correct ?

  Adding process.StandardError.ReadToEnd(); makes the script finish as expected, but also makes it block, which is not acceptable.

• FFMPEG script to merge all files in a list and make a 1920x1080p 60fps mp4 video

  28 février 2021, par BitBit

  I have a list of 46 videos in a text file. I tried the concat method to merge all of them, which worked but the quality is very poor and the audio is bugged/missing at parts.

  Can someone please help me with a script to merge all 46 videos and the output to be 1920x1080 60fps mp4 video ?