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• FFMPEG Concat Videos with audio on some and not others

  8 novembre 2022, par Jacob

  I am rendering video from a camcorder with its perspective audio. I am then concatenating several of the rendered video files together to make one video file. The problem I am having is that some videos will need audio and some will not, depending on the user's preference. If all of the videos need audio or all of the videos do not need audio, all works well. However, if audio is selected on some and not others, I have problems. For example, if I have three videos that need to be concatenated, the first has audio, the second does not have audio and third does have audio, then the final rendered file plays the audio of the third video on the second video and no audio on the third.

  


  Below is the parameters for rendering each video file with audio :

  


  parameters = "-y -i " + frames[0].VideoPath + " -f lavfi -t " + frames[1].TimeCode.TotalSeconds + @" -i anullsrc -filter_complex " + '"' + "[0:v]trim=" + frames[0].TimeCode.TotalSeconds + ":" + frames[1].TimeCode.TotalSeconds +
            @", setpts=PTS-STARTPTS[trimedv0];[0:a]atrim=" + frames[0].TimeCode.TotalSeconds + ":" + frames[1].TimeCode.TotalSeconds + @", asetpts=PTS-STARTPTS[a];[trimedv0]yadif," + orientation + @"setsar=1/1, eq=contrast=1:brightness=0, drawtext=text=\'%{pts\:localtime\:" + ToUnixTimestamp(frames[0].FrameTime) +
            @"\:'" + CurrentDisplayDateFormat.DateOutputFormat + @"'}\'" + @":fontfile=\'Fonts/" + font.FirstOrDefault() + @"\':fontcolor=" + fontColor + ":x=" + DATEXOFF +
            ":y=" + DATEYOFF + " -th:fontsize=" + tempFont +
            @":box=1:boxcolor=" + boxColor + @"@" + opacity + @", drawtext=text=\'%{pts\:localtime\:" + ToUnixTimestamp(frames[0].FrameTime) + @"\:'" + CurrentDisplayDateFormat.TimeOutputFormat + @"'}\'" + @":fontfile=\'Fonts/" + font.FirstOrDefault() + @"\':fontcolor=" + fontColor +
            ":x=" + TIMEXOFF + ":y=" + TIMEYOFF +
            " -th:fontsize=" + tempFont + @":box=1:boxcolor=" + boxColor + @"@" + opacity + '"' + " -sn -map [a] -shortest -ac 2 -c:v libx264 -preset ultrafast -profile:v baseline -level 3.0 -pix_fmt yuv420p -f mpegts -c:a aac " +
            vidPath + @"\v" + outputFile.ToString() + ".TMP";


  


  Below is the parameters without audio :

  


  parameters = "-y -i " + frames[0].VideoPath + " -filter_complex " + '"' + "[0:v] trim=" + frames[0].TimeCode.TotalSeconds + ":" + frames[1].TimeCode.TotalSeconds +
            @", setpts=PTS-STARTPTS[trimedv0];[trimedv0]yadif," + orientation + @"setsar=1/1, eq=contrast=1:brightness=0, drawtext=text=\'%{pts\:localtime\:" + ToUnixTimestamp(frames[0].FrameTime) +
           @"\:'" + CurrentDisplayDateFormat.DateOutputFormat + @"'}\'" + @":fontfile =\'Fonts/" + font.FirstOrDefault() + @"\':fontcolor=" + fontColor + ":x=" + DATEXOFF +
            ":y=" + DATEYOFF + " -th:fontsize=" + tempFont +
            @":box=1:boxcolor=" + boxColor + @"@" + opacity + @", drawtext=text=\'%{pts\:localtime\:" + ToUnixTimestamp(frames[0].FrameTime) + @"\:'" + CurrentDisplayDateFormat.TimeOutputFormat + @"'}\'" + @":fontfile =\'Fonts/" + font.FirstOrDefault() + @"\':fontcolor=" + fontColor +
            ":x=" + TIMEXOFF + ":y=" + TIMEYOFF +
            " -th:fontsize=" + tempFont + @":box=1:boxcolor=" + boxColor + @"@" + opacity + '"' + " -sn -an -c:v libx264 -preset ultrafast -profile:v baseline -level 3.0 " +
            @"-pix_fmt yuv420p -f mpegts " + vidPath + @"\v" + outputFile.ToString() + ".TMP";


  


  Below is the parameters to concatenate the video files to one file :

  


  string parameters = "-probesize 100M -analyzeduration 100M -i concat:" + '"' + concatString + '"' + @" -c:v copy " + ExportOptions.CompleteDestinationPath;



    


  


• How to apply 2 filters drawtext and drawbox using FFMPEG

  9 juillet 2017, par user6972

  I’m having problems combining filters. I’m trying to take video from the camera, apply a timer on it and also overlay a box in the center. I can put a time code (local time and pts) using the -vf drawtext command no problems :

  ffmpeg -f video4linux2 -input_format mjpeg -s 1280x720 -i /dev/video0 \
  
  -vf "drawtext=fontfile=/usr/share/fonts/truetype/freefont/FreeSerif.ttf: \
  
  text='%{localtime} %{pts\:hms}':  fontcolor=white: fontsize=24: box=1: \
  
  boxcolor=black@0.8: boxborderw=5: x=0: y=0" -vcodec libx264 \
  
  -preset ultrafast -f mp4 -pix_fmt yuv420p -y output.mp4

  Then I have one that draws a small box using drawbox :

  ffmpeg -f video4linux2 -input_format mjpeg -s 1280x720 -i /dev/video0 \
  
  -filter_complex " drawbox=x=iw/2:y=0:w=10:h=ih:color=red@0.1": \
  
  -vcodec libx264 -preset ultrafast -f mp4 -pix_fmt yuv420p -y output.mp4

  I assumed I could combine these with the filter_complex switch and separate them using the semicolon like this

  ffmpeg -f video4linux2 -input_format mjpeg -s 1280x720 -i /dev/video0 -filter_complex "drawtext=fontfile=/usr/share/fonts/truetype/freefont/FreeSerif.ttf: text='%{localtime} %{pts\:hms}':  fontcolor=white: fontsize=24: box=1: boxcolor=black@0.8;drawbox=x=iw/2:y=0:w=10:h=ih:color=red@0.1": -vcodec libx264 -preset ultrafast -f mp4 -pix_fmt yuv420p -y output.mp4

  But it fails to find the input stream on the second filter :

  Input #0, video4linux2,v4l2, from ’/dev/video0’ :

  Duration : N/A, start : 10651.720690, bitrate : N/A

  Stream #0:0 : Video : mjpeg, yuvj422p(pc, bt470bg/unknown/unknown), 1280x720, -5 kb/s, 30 fps, 30 tbr, 1000k tbn, 1000k tbc

  Cannot find a matching stream for unlabeled input pad 0 on filter Parsed_drawbox_1

  I tried to direct it to [0] like this :

  ffmpeg -f video4linux2 -input_format mjpeg -s 1280x720 -i /dev/video0 -filter_complex " \
  
  drawtext=fontfile=/usr/share/fonts/truetype/freefont/FreeSerif.ttf: \
  
  text='%{localtime} %{pts\:hms}':  fontcolor=white: fontsize=24: box=1: \
  
  boxcolor=black@0.8;[0] drawbox=x=iw/2:y=0:w=10:h=ih:color=red@0.1": \
  
  -vcodec libx264 -preset ultrafast -f mp4 -pix_fmt yuv420p -y output.mp4

  But it fails to put the box on the output.

  So I tried to split streams like this

  ffmpeg -f video4linux2 -input_format mjpeg -s 1280x720 -i /dev/video0 -filter_complex " \
  
  split [main][tmp];\
  
  [main] drawtext=fontfile=/usr/share/fonts/truetype/freefont/FreeSerif.ttf: \
  
  text='%{localtime} %{pts\:hms}':  fontcolor=white: fontsize=24: box=1: boxcolor=black@0.8 [tmp];\
  
  [main] drawbox=x=iw/2:y=0:w=10:h=ih:color=red@0.1 [tmp2]; [tmp][tmp2] overlay": \
  
  -vcodec libx264 -preset ultrafast -f mp4 -pix_fmt yuv420p -y output.mp4

  But my build doesn’t have the overlay filter complied with it. At this point I decided to stop and ask if I’m making this harder than it should be. The end result is I just want a timer and a box drawn on the video. Is there a better way or a formatting trick to do this ?

  Thanks

• Overlaying text on video with required angle using FFMPEG

  24 septembre 2017, par Harsha Vardhan

  I am trying to overlay some text on video using ffmpeg. I am able to overlay text by the bellow command.

  ffmpeg -i input1.mp4 -filter_complex "[0:v]transpose=2[anticlockwiserotated];[anticlockwiserotated]drawtext=fontfile=../../public/fonts/Roboto-Regular-webfont.ttf: text='Test Text':x=100: y=50: fontsize=36: fontcolor=white:[textapplied];[textapplied]transpose=1" output_video.mp4

  It is allowing me to overlay horizontally or vertically only.

  But I want to append it with some angle like 45 degrees.

  For that if I modify the command as

  ffmpeg -i input1.mp4 -filter_complex "[0:v]rotate=45*PI/180[anticlockwiserotated];[anticlockwiserotated]drawtext=fontfile=../../public/fonts/Roboto-Regular-webfont.ttf: text='Test Text':x=100: y=50: fontsize=36: fontcolor=white:[textapplied];[textapplied]rotate=315*PI/180" output_video.mp4

  By this I am getting overlay video as :

  

  Because in this first I am rotating video to 45 degrees, appending text and bringing it back to original position. So I am loosing borders.

  Please suggest me the best way to overlay text with required angle on video.

  Thanks in advance.