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• PHP-FFMPEG Waveform is a little noisy, how to fix that ?

  18 avril 2023, par Kranchi

  I made a waveform through sample code :

  


  $waveform = $audio->waveform(2000, 500, array('#FFA500'));
$waveform->save('waveform.png');


  


  But result has some noise in top & bottom of edges :
https://gcdnb.pbrd.co/images/80v6Up6etCrD.png?o=1

  


  So I made a tiny change in line 140 of src\FFMpeg\Media\Waveform.php :

  


  //'showwavespic=colors='.$this->compileColors().':s='.$this->width.'x'.$this->height,
'showwavespic=draw=full:colors='.$this->compileColors().':s='.$this->width.'x'.$this->height,


  


  And problem fixed :
https://gcdnb.pbrd.co/images/KsCFsOujmJ9W.png?o=1

  


  I'm not sure is this a bug or problem in FFMpeg dll file and my question :

  


  is it possible to send the new command or override save method to avoid hacking the original file ? (the save method is using some protected methods)

  


  https://github.com/PHP-FFMpeg/PHP-FFMpeg/blob/master/src/FFMpeg/Media/Waveform.php

  


  Thanks.

  


  ---

  


  PHP-FFMpeg : 23 | FFMpeg : 2023-02-27-git-891ed24f77 (Win X64) |
PHP : 8.2

  


• Is there a way to use pdf images with the saveVideo function of R's animation package ?

  11 avril 2023, par Hullaballoon

  I've created a few MP4 files using the saveVideo function in the animation package, but the colours are relatively dull in one of them. I've compared the output of one of the images in the animation by producing a PNG and a PDF, with the colours in the PDF appearing much bolder. I was hoping to code the images as PDFs within the animation to see if it improves the output, but I am getting stuck with a message "Rplot.pdf : Invalid data found when processing input" and no MP4 being produced.

  


  The internal code of the saveVideo function implies that PDF images can be used with the following :

  


  num = ifelse(file.ext == "pdf", "", ani.options("imgnfmt"))


  


  Here's a toy example that demonstrates the issue. This works fine :

  


  library(animation)
saveVideo({
  darkcol = "#000000"
  par(bg = darkcol)
  ani.options(interval = 0.5)
  for (i in 1:10)
  {
    plot(0:10, runif(11, 4, 8), col = "magenta1")
    ani.pause()
  }
}, video.name = "TestVideo.mp4",
ani.res = 144, ani.height = 900, ani.width = 1600)


  


  This one doesn't work :

  


  library(animation)
saveVideo({
  pdf(ani.options("img.fmt"))
  darkcol = "#000000"
  par(bg = darkcol)
  ani.options(interval = 0.5)
  for (i in 1:10)
  {
    plot(0:10, runif(11, 4, 8), col = "magenta1")
    ani.pause()
  }
}, video.name = "TestVideoPDF.mp4",
ani.res = 144, ani.height = 9, ani.width = 16,
use.dev = FALSE, ani.type = "pdf")


  


  Here is what the console displays when I run the second batch of code :

  


  Executing: "ffmpeg" -y -framerate 2 -i Rplot.pdf -pix_fmt yuv420p TestVideoPDF.mp4
ffmpeg version 2023-04-06-git-b564ad8eac-full_build-www.gyan.dev Copyright (c) 2000-2023 the FFmpeg developers
built with gcc 12.2.0 (Rev10, Built by MSYS2 project)
configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-bzlib --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libaribb24 --enable-libdav1d --enable-libdavs2 --enable-libuavs3d --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxvid --enable-libaom --enable-libjxl --enable-libopenjpeg --enable-libvpx --enable-mediafoundation --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-liblensfun --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libvpl --enable-libshaderc --enable-vulkan --enable-libplacebo --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libcodec2 --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
libavutil      58.  6.100 / 58.  6.100
libavcodec     60.  9.100 / 60.  9.100
libavformat    60.  4.101 / 60.  4.101
libavdevice    60.  2.100 / 60.  2.100
libavfilter     9.  5.100 /  9.  5.100
libswscale      7.  2.100 /  7.  2.100
libswresample   4. 11.100 /  4. 11.100
libpostproc    57.  2.100 / 57.  2.100
Rplot.pdf: Invalid data found when processing input


  


  I'm on a Windows PC running Windows 10 Enterprise. Any help would be greatly appreciated !

  


• Using ffmpeg to merge video segments created by the MediaRecorder API

  10 avril 2023, par Dario Cimmino

  I am recording a live video from a webcam using mediarecorder API un chunks of 3 seconds :

  


  startButton.addEventListener('click', () => {
navigator.mediaDevices.getUserMedia({
    video: {
        width: 1280,
        height: 720,
        frameRate: { ideal: 30, max: 30 }
    }
})
    .then(stream => {
        video.srcObject = stream;
        mediaRecorder = new MediaRecorder(stream, { mimeType: 'video/webm' });
        mediaRecorder.ondataavailable = async (event) => {
            const blob = new Blob([event.data], { type: 'video/mp4' });
            const formData = new FormData();
            formData.append('segment', blob, `segment${segmentNumber}.mp4`);

            // When a new video segment is ready
            fetch('http://localhost:3000/upload', {
                method: 'POST',
                body: formData
            })
                .then((response) => response.text())
                .then((result) => {
                    console.log('Upload result:', result);
                })
                .catch((error) => {
                    console.error('Error uploading video segment:', error);
                });
            //Upload data to mysql
            fetch('upload.php', {
                method: 'POST',
                body: formData
            })
                .then(response => response.text())
                .then(result => {
                    console.log('Upload result to MYSQL:', result);
                })
                .catch(error => {
                    console.error('Error uploading video segment to MYSQL:', error);
                });
            segmentNumber++;
        };

        mediaRecorder.start(3000);
    })
    .catch(error => {
        console.error('Error accessing camera:', error);
    });


  


  }) ;

  


  I am left with only the first segment playable, as is expected.

  


  How ever when the recording stops, i'd like to merge all those segments recorded using ffmpeg (or any other) with the help of my nodeJs server.

  


  I am having difficulty understand the parsing of mp4 files.

  


  if I try the command :

  


  ffmpeg -i segment1.mp4 -i segment2.mp4 -i segment3.mp4  out.mp4


  


  I get the following error :

  


      ffmpeg version N-110223-gb18a9c2971-20230410 Copyright (c) 2000-2023 the FFmpeg developers
  built with gcc 12.2.0 (crosstool-NG 1.25.0.152_89671bf)
  configuration: --prefix=/ffbuild/prefix --pkg-config-flags=--static --pkg-config=pkg-config --cross-prefix=x86_64-w64-mingw32- --arch=x86_64 --target-os=mingw32 --enable-gpl --enable-version3 --disable-debug --disable-w32threads --enable-pthreads --enable-iconv --enable-libxml2 --enable-zlib --enable-libfreetype --enable-libfribidi --enable-gmp --enable-lzma --enable-fontconfig --enable-libvorbis --enable-opencl --disable-libpulse --enable-libvmaf --disable-libxcb --disable-xlib --enable-amf --enable-libaom --enable-libaribb24 --enable-avisynth --enable-chromaprint --enable-libdav1d --enable-libdavs2 --disable-libfdk-aac --enable-ffnvcodec --enable-cuda-llvm --enable-frei0r --enable-libgme --enable-libkvazaar --enable-libass --enable-libbluray --enable-libjxl --enable-libmp3lame --enable-libopus --enable-librist --enable-libssh --enable-libtheora --enable-libvpx --enable-libwebp --enable-lv2 --disable-libmfx --enable-libvpl --enable-openal --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopenmpt --enable-librav1e --enable-librubberband --enable-schannel --enable-sdl2 --enable-libsoxr --enable-libsrt --enable-libsvtav1 --enable-libtwolame --enable-libuavs3d --disable-libdrm --disable-vaapi --enable-libvidstab --enable-vulkan --enable-libshaderc --enable-libplacebo --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxvid --enable-libzimg --enable-libzvbi --extra-cflags=-DLIBTWOLAME_STATIC --extra-cxxflags= --extra-ldflags=-pthread --extra-ldexeflags= --extra-libs=-lgomp --extra-version=20230410
  libavutil      58.  6.100 / 58.  6.100
  libavcodec     60.  9.100 / 60.  9.100
  libavformat    60.  4.101 / 60.  4.101
  libavdevice    60.  2.100 / 60.  2.100
  libavfilter     9.  5.100 /  9.  5.100
  libswscale      7.  2.100 /  7.  2.100
  libswresample   4. 11.100 /  4. 11.100
  libpostproc    57.  2.100 / 57.  2.100
Input #0, matroska,webm, from 'segment1.mp4':
  Metadata:
    encoder         : Chrome
  Duration: N/A, start: 0.000000, bitrate: N/A
  Stream #0:0(eng): Video: h264 (Constrained Baseline), yuv420p(progressive), 1280x720 [SAR 1:1 DAR 16:9], 30.30 fps, 30 tbr, 1k tbn (default)
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001d93cf25fc0] Format mov,mp4,m4a,3gp,3g2,mj2 detected only with low score of 1, misdetection possible!
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001d93cf25fc0] moov atom not found
segment2.mp4: Invalid data found when processing input


  


  any help or inputs are appreciated. THanks !