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• FFmpeg filter_complex merging two commands

  4 août 2016, par Matt Wall

  I’m having trouble merging these two commands, if anyone can help me merge the top ones transposing and watermarking to the second one I would really appreciate it. I’ve tried a few things such as :

  ffmpeg -i .\test1.flv -i .\test2.flv -loop 1 -i .\watermark.png -filter_complex "[0]transpose=1[a];[1]transpose=1[b];[a][b]hstack[c];[c][2]overlay=W-w-5:H-h-5:shortest=1; [0:v]setpts=PTS-STARTPTS, pad=iw*2:ih[bg]; [1:v]setpts=PTS-STARTPTS[fg]; amerge,pan=stereo:c0code>

  Thanks everyone !

• Use NVIDIA GPU to speed up drawtext with ffmpeg

  28 février 2020, par Garrett

  I use the following ffmpeg command add text to a video, which takes longer than I would like.

  ffmpeg -i input.mp4 -vf "[in] drawbox= x=iw*0.75:y=ih*0.88:w=iw*0.25:h=ih*0.12:color=black@0.7:t=fill, drawtext=fontsize=20:fontcolor=White:text='Test Text Row 1':x=(w*.75)+15:y=(h*.88)+15, drawtext=fontsize=20:fontcolor=White:text='Test Text Row 2':x=(w*.75)+15:y=((h*.88)+25)+15, drawtext=fontsize=20:fontcolor=White:text='Test Text Row 3':x=(w*.75)+15:y=((h*.88)+50)+15, drawtext=fontsize=20:fontcolor=White:text='Test Text Row 4':x=(w*.75)+15:y=((h*.88)+75)+15 [out]" -y out.mp4

  I believe I have successfully configured ffmpeg to use the GPU on my laptop by following NVIDIA’s guide, which can be found https://developer.nvidia.com/ffmpeg

  However I am having trouble integrating the commands to utilize the GPU with my command above. I tested the following command from NVIDIA’s site to test configuration and it worked without error.

  ffmpeg -vsync 0 -c:v h264_cuvid -i  -f rawvideo 

  I have not found any examples yet of the integration of drawtext and GPU acceleration so any guidance appreciated.

• Recording HTML5 canvas animation in mp4 format

  23 mai 2021, par amaidhassan niazi

  I am having trouble with recording canvas as video in mp4 file format. I managed to record the canvas as webm format using RecordRTC. When I tried to give mimetype : video/mp4 it gives an error unable to record as mimetype : video/mp4.

  



   var canvas = document.getElementById('canvas');
            var canvasStream = canvas.captureStream();

            var finalStream = new MediaStream();
            audioStream.getAudioTracks().forEach(function(track) {
                finalStream.addTrack(track);
            });
            canvasStream.getVideoTracks().forEach(function(track) {
                finalStream.addTrack(track);
            });

            var recorder = RecordRTC(finalStream, {
            type: 'video',
            mimeType: 'video/mp4'
            });

            recorder.startRecording();


  



  The above code works for webM format. I see no way to record HTML5 canvas to video in mp4 format. I just need to convert it to mp4 from webm. It takes a lot of time. Is there any way to directly record canvas as mp4 without going through the process of first making webm and then converting it to mp4 ?

  



  Thanks.