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• ffmpeg with python subprocess Popen

  17 juillet 2022, par Eular

  I'm trying to record webcam video from python using ffmpeg. The following ffmpeg works properly when run from the cmd

  


  ffmpeg -f dshow -rtbufsize 2000M -i video="HP HD Camera":audio="Headset (realme Buds Wireless 2 Neo Hands-Free AG Audio)" -y -vcodec libx264 -crf 24 output.mp4 


  


  I have checked the audio and video inputs with

  


  ffmpeg -list_devices true -f dshow -i dummy


  


  Now when I try to call the command using subprocess problem happens. I can just pass the whole command like this

  


  import subprocess, time
recorder = subprocess.Popen('ffmpeg -f dshow -rtbufsize 2000M -i video="HP HD Camera":audio="Headset (realme Buds Wireless 2 Neo Hands-Free AG Audio)" -y -vcodec libx264 -crf 24 output.mp4', shell=True)
time.sleep(10)
recorder.terminate()
recorder.kill()


  


  Now, as this is run with shell=True this won't terminate the recording and I have checked different solution, but they won't work either. So, I opted for shell=False. I tried with

  


  recorder = subprocess.Popen(['ffmpeg', '-f', 'dshow', '-rtbufsize', '2000M', '-t', '60', '-i', 'video="HP HD Camera":audio="Headset (realme Buds Wireless 2 Neo Hands-Free AG Audio)"', '-y', '-vcodec', 'libx264', '-crf', '24', 'output.mp4'],shell=False)


  


  This throws the error

  


  [dshow @ 0000024f2becd540] Could not find video device with name ["HP HD Camera"] among source devices of type video.
video="HP HD Camera":audio="Headset (realme Buds Wireless 2 Neo Hands-Free AG Audio)": I/O error


  


  Then, I tried

  


  recorder = subprocess.Popen(['ffmpeg', '-f', 'dshow', '-rtbufsize', '2000M', '-t', '60', '-i', 'video=HP HD Camera:audio=Headset (realme Buds Wireless 2 Neo Hands-Free AG Audio)', '-y', '-vcodec', 'libx264', '-crf', '24', 'output.mp4'],shell=False)


  


  This creates the output, but the video is not playable.
  
How to fix this ?

  


• ffmpeg one draw text to multiple outputs

  31 juillet 2023, par kRicha

  I've created command with ffmpeg-fluent, which connects video file with music, use shortest(video) duration, and output this to result file

  


  const newVideo = Ffmpeg(`./source/video/${category}/${dayNumber}.mp4`)
                .addInput(`./source/audio/${category}.mp3`)
                .addOption([
                    '-map 0:v:0',
                    '-map 1:a:0',
                    '-shortest'
                ]);

            newVideo.videoFilters({
                filter: 'drawtext',
                options: { ...FONT_OPTIONS, ...{ text: '1', boxcolor: 'black@1', y: 280 } }
            }).output('out1.mp4')
                .output('out2.mp4');


  


  generated command line :

  


  ffmpeg \
-i ./source/video/women/1.mp4 \
-i ./source/audio/women.mp3 -y \
-filter:v drawtext=fontsize=80:fontcolor=white:x=(w-tw)/2:box=1:boxborderw=20:fontfile=./OpenSans-Light.ttf:text=1:boxcolor=black@1:y=280,drawtext=fontsize=80:fontcolor=white:x=(w-tw)/2:box=1:boxborderw=20:fontfile=./OpenSans-Light.ttf:text=a0:boxcolor=black@0.8:enable='between(t,0,6.5)':y=700,drawtext=fontsize=80:fontcolor=white:x=(w-tw)/2:box=1:boxborderw=20:fontfile=./OpenSans-Light.ttf:text=a1:boxcolor=black@0.8:enable='between(t,0,6.5)':y=800,drawtext=fontsize=80:fontcolor=white:x=(w-tw)/2:box=1:boxborderw=20:fontfile=./OpenSans-Light.ttf:text=a2:boxcolor=black@0.8:enable='between(t,0,6.5)':y=900,drawtext=fontsize=80:fontcolor=white:x=(w-tw)/2:box=1:boxborderw=20:fontfile=./OpenSans-Light.ttf:text=a3:boxcolor=black@0.8:enable='between(t,0,6.5)':y=1000,drawtext=fontsize=80:fontcolor=white:x=(w-tw)/2:box=1:boxborderw=20:fontfile=./OpenSans-Light.ttf:text=b0:boxcolor=black@0.8:enable='between(t,7,10)':y=1000,drawtext=fontsize=80:fontcolor=white:x=(w-tw)/2:box=1:boxborderw=20:fontfile=./OpenSans-Light.ttf:text=b1:boxcolor=black@0.8:enable='between(t,7,10)':y=1100,drawtext=fontsize=80:fontcolor=white:x=(w-tw)/2:box=1:boxborderw=20:fontfile=./OpenSans-Light.ttf:text=b2:boxcolor=black@0.8:enable='between(t,7,10)':y=1200,drawtext=fontsize=80:fontcolor=white:x=(w-tw)/2:box=1:boxborderw=20:fontfile=./OpenSans-Light.ttf:text=b3:boxcolor=black@0.8:enable='between(t,7,10)':y=1300,drawtext=fontsize=80:fontcolor=white:x=(w-tw)/2:box=1:boxborderw=20:fontfile=./OpenSans-Light.ttf:text=b4:boxcolor=black@0.8:enable='between(t,7,10)':y=1400,drawtext=fontsize=30:fontcolor=white:x=(w-tw)/2:box=1:boxborderw=20:fontfile=./OpenSans-Light.ttf:text=c:enable='between(t,10.2,inf)':boxcolor=black@1:y=1500,drawtext=fontsize=30:fontcolor=white:x=(w-tw)/2:box=1:boxborderw=20:fontfile=./OpenSans-Light.ttf:text=d:enable='between(t,10.2,inf)':boxcolor=black@1:y=1550 \
-map 0:v:0 \
-map 1:a:0 \
-shortest out2/_.mp4


  


  if I add second output it works, but without audio and drawtext ? How could I fixe this and get draw text works on both outputs

  


• Revision 1306ba7659 : Remove vp9_type_aliases.h Prefer the standard fixed-size integer typedefs. Cha

  14 décembre 2012, par John Koleszar

  Changed Paths : Modify /vp9/common/vp9_filter.c Modify /vp9/common/vp9_onyx.h Modify /vp9/common/vp9_onyxd.h Modify /vp9/common/vp9_pred_common.h Modify /vp9/common/vp9_seg_common.h Modify /vp9/common/vp9_subpelvar.h Delete /vp9/common/vp9_type_aliases.h (...)