Recherche avancée

Sur d’autres sites (12342)

• Piping stdout from child process directly to google cloud storage. Node.js

  2 octobre 2018, par glenn

  anyone here with expertise on piping to google cloud storage ?

  i am using FFmpeg on a server, and want to pipe to my storage bucket.

  I can get it working when I save FFmpeg output to a file, then createReadableStream from the file, and then pipe that to createWriteStream()

  however, I dont want to generate a static file, and then go through that process every time

  Why can I not just simply pipe FFmpeg.stdout.pipe(file.createWriteStream()) ?

  FYI : I am running FFmpeg as a child process

        spawnFFMPEG = () => {
  
  this.ffmpeg = child_process.spawn('ffmpeg',
  
    [
  
      '-f', 'lavfi', '-i', 'anullsrc',
  
      '-thread_queue_size', '512',
  
      '-i', '-',
  
      '-shortest', '-vcodec', 'copy',
  
      '-f', 'avi',
  
      'pipe:1'
  
    ]
  
  )
  
  
  
   this.ffmpeg.stdout.pipe(myWritableStream)

• Vertical video play does not sync with multiple stacked video

  5 novembre 2018, par Sabha

  I dont know if I have wrote the subject well and if that can be understood. Nevertheless, here is an explanation

  I have 7 videos of different dimensions where the width is same (1080). I wish to place them one below the other to get a full hd vertical video (1080x1920). I tried the -filter_complex vstack filter in ffmpeg and got all the videos aligned one below the other and I am getting a perfect 1080x1920 full hd vertical video but they dont sync with each other. Once the videos are in sync, I need to put an audio too which should also sync with the in-sync video that will be made.

  There is so much of complexity. Please advice how do I make them sync. Is there any software that can allow me to put 7 videos one below the other in a timeline ? (if not 7, atleast 3-4 videos). Please advice where and how to start.

  Is there any option in Adobe Premier or any other software ?

  Thanks

  EDIT : I am doing a very long procedure to combine all 7 videos vertically

  first i use

  ffmpeg -i video1.mp4 -i video2.mp4 -preset veryslow -filter_complex vstack video12.mp4

  and then

  ffmpeg -i video12.mp4 -i video3.mp4 -preset veryslow -filter_complex vstack video123.mp4

  so on and so forth

  Is there a better way to do it all in one command ?

• Reading file stream from Google Cloud Storage to ffmpeg (using fluent-ffmpeg)

  27 juillet 2018, par ekuusi

  I’m trying to run ffmpeg on a NodeJS backend with fluent-ffmpeg, reading input files from Google Cloud Storage. Everything works fine if I download the file first :

  const file = storage
  
      .bucket('example_bucket')
  
      .file('examplefile.mp4');
  
  
  
  file.download({destination: 'test.mp4'}, (err) => {
  
  
  
      let command = ffmpeg()
  
      .input('test.mp4')
  
      .duration(10)
  
      .format('mp4');
  
  
  
      command.save('test_out.mp4');
  
  
  
  });
  
  
  
  res.json([{
  
      message: 'Command sent!'
  
  }]);

  But if I try to use a readable stream as the input, it fails :

  const file = storage
  
      .bucket('example_bucket')
  
      .file('examplefile.mp4');
  
  
  
  
  
  var filestream = file.createReadStream()
  
  
  
  let command = ffmpeg()
  
      .input(filestream)
  
      .duration(10)
  
      .format('mp4');
  
  
  
  
  
  command.save('test_out.mp4');
  
  });
  
  
  
  res.json([{
  
      message: 'Command sent!'
  
  }]);

  Here is the full output of ffmpeg when trying to do the conversion. It seems to read the details of the file fine but for some reason it fails, saying "Cannot process video : ffmpeg exited with code 1 : pipe:0 : Invalid data found when processing input"

  Spawned Ffmpeg with command: ffmpeg -i pipe:0 -y -t 10 -f mp4 test_out.mp4
  
  Stderr output: ffmpeg version 4.0.1 Copyright (c) 2000-2018 the FFmpeg developers
  
  Stderr output:   built with Apple LLVM version 9.1.0 (clang-902.0.39.2)
  
  Stderr output:   configuration: --prefix=/opt/local --enable-swscale --enable-avfilter --enable-avresample --enable-libmp3lame --enable-libvorbis --enable-libopus --enable-librsvg --enable-libtheora --enable-libopenjpeg --enable-libmodplug --enable-libvpx --enable-libsoxr --enable-libspeex --enable-libass --enable-libbluray --enable-lzma --enable-gnutls --enable-fontconfig --enable-libfreetype --enable-libfribidi --disable-libjack --disable-libopencore-amrnb --disable-libopencore-amrwb --disable-libxcb --disable-libxcb-shm --disable-libxcb-xfixes --disable-indev=jack --enable-opencl --disable-outdev=xv --enable-audiotoolbox --enable-videotoolbox --enable-sdl2 --mandir=/opt/local/share/man --enable-shared --enable-pthreads --cc=/usr/bin/clang --arch=x86_64 --enable-x86asm --enable-libx265 --enable-gpl --enable-postproc --enable-libx264 --enable-libxvid
  
  Stderr output:   libavutil      56. 14.100 / 56. 14.100
  
  Stderr output:   libavcodec     58. 18.100 / 58. 18.100
  
  Stderr output:   libavformat    58. 12.100 / 58. 12.100
  
  Stderr output:   libavdevice    58.  3.100 / 58.  3.100
  
  Stderr output:   libavfilter     7. 16.100 /  7. 16.100
  
  Stderr output:   libavresample   4.  0.  0 /  4.  0.  0
  
  Stderr output:   libswscale      5.  1.100 /  5.  1.100
  
  Stderr output:   libswresample   3.  1.100 /  3.  1.100
  
  Stderr output:   libpostproc    55.  1.100 / 55.  1.100
  
  Stderr output: [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fb6db80a200] stream 2, offset 0x30: partial file
  
  Stderr output: [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fb6db80a200] Could not find codec parameters for stream 0 (Video: h264 (avc1 / 0x31637661), none, 1920x1080, 4647 kb/s): unspecified pixel format
  
  Stderr output: Consider increasing the value for the 'analyzeduration' and 'probesize' options
  
  Stderr output: Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'pipe:0':
  
  Stderr output:   Metadata:
  
  Stderr output:     major_brand     : isom
  
  Stderr output:     minor_version   : 512
  
  Stderr output:     compatible_brands: isomiso2avc1mp41
  
  Stderr output:     encoder         : Lavf58.12.100
  
  Stderr output:     location-eng    : +60.2121+024.8754/
  
  Stderr output:     location        : +60.2121+024.8754/
  
  Stderr output:   Duration: 00:02:23.13, bitrate: N/A
  
  Stderr output:     Stream #0:0(eng): Video: h264 (avc1 / 0x31637661), none, 1920x1080, 4647 kb/s, SAR 1:1 DAR 16:9, 59.94 fps, 59.94 tbr, 60k tbn, 120k tbc (default)
  
  Stderr output:     Metadata:
  
  Stderr output:       handler_name    : VideoHandler
  
  Stderr output:     Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
  
  Stderr output:     Metadata:
  
  Stderr output:       handler_name    : SoundHandler
  
  Stderr output:     Stream #0:2(eng): Data: none (tmcd / 0x64636D74)
  
  Stderr output:     Metadata:
  
  Stderr output:       handler_name    : TimeCodeHandler
  
  Stderr output: Stream mapping:
  
  Input is aac (mp4a / 0x6134706D) audio with h264 (avc1 / 0x31637661) video
  
  Stderr output:   Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
  
  Stderr output:   Stream #0:1 -> #0:1 (aac (native) -> aac (native))
  
  Stderr output: [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fb6db80a200] stream 0, offset 0x34: partial file
  
  Stderr output: pipe:0: Invalid data found when processing input
  
  Stderr output: Cannot determine format of input stream 0:0 after EOF
  
  Stderr output: Error marking filters as finished
  
  Stderr output: Conversion failed!
  
  Stderr output: 
  
  Cannot process video: ffmpeg exited with code 1: pipe:0: Invalid data found when processing input
  
  Cannot determine format of input stream 0:0 after EOF
  
  Error marking filters as finished
  
  Conversion failed!