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• Use ffmpeg Windows batch script on OS X

  3 novembre 2015, par andisk

  I got an ffmpeg batch script written by someone. The script takes all video clips of a specific folder, cuts off first and last frame, converts the clips to ProRes and saves them in a new folder. I got it running under Windows (just have to double-click the *.bat file and it does what it’s supposed to do).
  But now I need that same script running on a mac. I’ve installed ffmpeg over homebrew. Then I tried to make a Automator-Service, but with no success. Best thing would be if I could just right click on the folder with the videos, go to services and click on convert. I’m not really into coding and scripting, but the people who should use the script are happy when they find the power switch of the computer..
  Can anyone help me with this ?
  Cheers andisk

  Edit : Here’s the code

      `@echo off
  
  
  
  
  
      mkdir tmp
  
      mkdir converted
  
  
  
  
  
      set pathtofind=%~dp0
  
      echo Searching for files in %pathtofind%%1\
  
  
  
  
  
      setlocal enableextensions
  
      setlocal ENABLEDELAYEDEXPANSION
  
  
  
  
  
  
  
      for %%f in (%pathtofind%%1\*) do (
  
              echo Handling file %%f
  
              ffmpeg -y -loglevel quiet -i %%f tmp\%%d.png
  
              set count=0
  
              for %%x in (tmp\*) do set /a count +=1
  
              echo Deleting frames 1 and !count!
  
              del tmp\1.png
  
              del tmp\!count!.png
  
              echo Saving %%~nf.mov
  
              ffmpeg -y -loglevel verbose -f image2 -r 24 -i tmp\%%d.png -vcodec prores -profile:v 1 -r 24 converted\%%~nf.mov
  
              del /q tmp\*.*
  
  
  
              echo ---------------------------
  
      )
  
  
  
  
  
      rd tmp`

• NSTask and FFMpeg losing output

  16 novembre 2011, par Morgan

  I'm trying to call ffmpeg from NSTask in objective-c. I execute the ffmpeg command in terminal and it works flawlessly every time. I make the same command using NSTask, and it never gives me the whole output. It cuts it off half way through the output, at a seemingly random spot every time. Here is my code.

      - (void)applicationDidFinishLaunching:(NSNotification *)aNotification
  
  {
  
      NSString* ffmpegPath = [[NSBundle mainBundle] pathForResource:@"ffmpeg" ofType:@""];
  
      NSString* path = @"test.mov";
  
  
  
      NSTask *task = [[NSTask alloc] init];
  
      NSArray *arguments = [NSArray arrayWithObjects: @"-i", path, nil];
  
      NSPipe *pipe = [NSPipe pipe];
  
      NSFileHandle * read = [pipe fileHandleForReading];
  
  
  
      [task setLaunchPath: ffmpegPath];
  
      [task setArguments: arguments];
  
      [task setStandardOutput: pipe];
  
      [task launch];
  
      [task waitUntilExit];
  
  
  
      NSData* data = [read readDataToEndOfFile];
  
      NSString* stringOutput = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
  
  
  
  
  
      NSLog(@"%@", stringOutput);
  
      NSLog(@"%i", [task terminationStatus]);
  
      NSLog(@"DONE");
  
  }

• ffmpeg frame-accurate cutting

  24 septembre 2018, par jvecsei

  I’ve been trying for some time to achieve frame-accurate cuts with ffmpeg.

  Since I don’t want to do a complete re-encoding, my idea was to do a re-encoding only at the intersections. This works fine, but it seems like the sound will become more and more asynchronous over time (at the end 0.5s).

  The command for the intersection point is from the "real" start to the next keyframe :

  ffmpeg -ss 468.24 -to 474.680000 -i input.avi -c:a mp3 -c:v h264 -avoid_negative_ts make_zero -pix_fmt yuv420p -r 25 input.avi_0.tmp.start.avi

  The command for what comes next is from the keyframe to the next cut :

  ffmpeg -ss 479.720000 -t 2039.320000 -i input.avi -c copy -avoid_negative_ts make_zero -pix_fmt yuv420p input.avi_0.tmp.avi

  I do this multiple times and fhe file names of the results will be written to concat.txt

  Then i merge the files with :

  ffmpeg -f concat -fflags +genpts -async 1 -i input.avi_concat.txt -c copy -pix_fmt yuv420p -y input.cut.avi

  Does anyone have any idea what else I can try ? I tried async/vsync but unfortunately without any great result. Before executing the concat command the files are all fine...