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• how to combine all chunk videos path into text file using ffmpeg

  31 juillet 2017, par Megha CS

  Task is to create final output video by combining all chunk videos recording from webcam using ffmpeg.

  For that, created process with passing the ffmpeg command as argument and save all chunk videos to local folder.

  code snippet :

  process =new Process();
  
  process.StartInfo.FileName = Directory.GetCurrentDirectory() + @"\ffmpeg.exe";
  
  process.StartInfo.Arguments = "-re -rtbufsize 1000M -f dshow -i video=" + "\"" + vidDevName + "\"" + " -acodec libvo_aacenc -ab 48kb -ar 22050 -ac 2 -b:a 128k -vcodec libx264 -r 25 -s 480x360 -pix_fmt yuv420p -preset medium -segment_time 10 -f segment output%03d.mp4";
  
  process.Start();

  Its working fine. But now, have to create text file of listing all chunk videos path and can create final output video by using "-f concat -safe 0 -i mylist.txt -c copy output.mp4" as an argument.

  Am stuck in creating text file with listing all chunk videos path in c#.
  I have used (for %i in (*.wav) do @echo file ’%i’) > mylist.txt to create text file. Its working fine in command prompt but not in C# application.
  So please suggest on this.

• drawtext with ffmpeg python

  22 mai 2024, par Wolf Wolf

  I am trying to add a text to a video using ffmpeg and python.
I tried to do this in the following ways, but it didn't work.

  


  first

  


  (
         ffmpeg
         .input(in_video)
         .filter('drawtext',
                 fontsize=30,
                 fontfile=r"D:\projects\python\editor_bot\downloads\Candara.ttf",
                 text='test test test.',
                 x='if (eq(mod(t\\, 15)\\, 0)\\, rand(0\\, (w-text_w))\\, x)',
                 y='if (eq(mod(t\\, 10)\\, 0)\\, rand(0\\, (h-text_h))\\, y)')
         .output(f'output-final.mp4')
         .run()
 )


  


  second

  


  fil = fr"drawtext=text='test test test':fontsize=30:fontfile=':\projects\python\editor_bot\downloads\Candara.ttf':x='if (eq(mod(t\, 15)\, 0)\, rand(0\, (w-text_w))\, x)':y='if (eq(mod(t\, 10)\, 0)\, rand(0\, (h-text_h))\, y)'"
    (
        ffmpeg
        .input(in_video)
        .output(f'output-final.mkv', filter_complex=fil)
        .run()
    )


  


  But by running this command

  


  ffmpeg -i v1.mp4 -filter:v drawtext="fontsize=30:fontfile=candara.ttf:text='testtest test.':x=if(eq(mod(t\,15)\,0)\,rand(0\,(w-text_w))\,x):y=if(eq(mod(t\,10)\,0)\,rand(0\,(h-text_h))\,y)" -c:a copy -c:v libx264 -preset slow -crf 18 V13.mkv


  


  In the terminal, what I want is done exactly

  


  thanks

  


• Can moviepy render via GPU, using something like FFMPEG ?

  21 août, par Shenhav Mor

  I'm working on something that concatenate videos and adds some titles on through moviepy.

  


  As I saw on the web and on my on pc moviepy works on the CPU and takes a lot of time to save(render) a movie. Is there a way to improve the speed by running the writing of moviepy on GPU ? Like using FFmpeg or something like this ?

  


  I didn't find an answer to that on the web, so I hope that some of you can help me.
I tried using thread=4 and thread=16 but they are still very very slow and didn't change much.

  


  My CPU is very strong (i7 10700k), but still, rendering on moviepy takes me for a compilation with a total of 8 minutes 40 seconds, which is a lot.

  


  Any ideas ?Thanks !
the code doesnt realy matter but :

  


  def Edit_Clips(self):

    clips = []

    time=0.0
    for i,filename in enumerate(os.listdir(self.path)):
        if filename.endswith(".mp4"):
            tempVideo=VideoFileClip(self.path + "\\" + filename)

            txt = TextClip(txt=self.arrNames[i], font='Amiri-regular',
                           color='white', fontsize=70)
            txt_col = txt.on_color(size=(tempVideo.w + txt.w, txt.h - 10),
                                   color=(0, 0, 0), pos=(6, 'center'), col_opacity=0.6)

            w, h = moviesize = tempVideo.size
            txt_mov = txt_col.set_pos(lambda t: (max(w / 30, int(w - 0.5 * w * t)),
                                                 max(5 * h / 6, int(100 * t))))

            sub=txt_mov.subclip(time,time+4)
            time = time + tempVideo.duration

            final=CompositeVideoClip([tempVideo,sub])

            clips.append(final)

    video = concatenate_videoclips(clips, method='compose')
    print("after")
    video.write_videofile(self.targetPath+"\\"+'test.mp4',threads=16,audio_fps=44100,codec = 'libx264')