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• How to effectively turn high resolution images into a video with ffmpeg ?

  5 septembre 2022, par Sprout Coder
  

  • I have 24 frames (frame-%d.png)

  


  • I want to turn them into a video that will be 1 second long

  


  • That means that each frame should play for 1/24 seconds

  


  


  I'm trying to figure out the correct settings in order to achieve that :

  


  await new Promise((resolve) => {
  ffmpeg()
    .on('end', () => {
      setTimeout(() => {
        console.log('done')
        resolve()
      }, 100)
    })
    .on('error', (err) => {
      throw new Error(err)
    })
    .input('/my-huge-frames/frame-%d.png')
    .inputFPS(1/24)
    .output('/my-huge-video.mp4')
    .outputFPS(24)
    .noAudio()
    .run()


  


  

  1. Are my inputFPS(1/24) & outputFPS(24) correct ?

  


  2. Each frame-%d.png is huge : 32400PX x 32400PX ( 720Mb). Will ffmpeg be able to generate such a video, and if so, will the video be playable ? If not, what is the maximum resolution each frame-%d.png should have instead ?

  


  3. Since the process will be quite heavy, I believe using the command line could be more appropriate. In that case, what is the equivalent of the above Js code in the command line (as in ffmpeg -framerate etc...) ?

  


  


• FFmpeg does not encode chapter titles [closed]

  15 octobre 2023, par Shironats

  I am trying to add chapters to a .mp4 file.
When I tried extracting the metadata using the following command :

  


  ffmpeg -i INPUT.mp4 -f ffmetadata FFMETADATAFILE.txt

  


  I got an output file as follows :

  


  ;FFMETADATA1
major_brand=mp42
minor_version=0
compatible_brands=isommp42
encoder=Lavf60.15.100


  


  So now I try to add some chapters as such

  


  [CHAPTER]
TIMEBASE=1/1000
START=0
END=424510
title=mytitle1

[CHAPTER]
TIMEBASE=1/1000
START=424511
END=941600
title=mytitle2

[CHAPTER]
TIMEBASE=1/1000
START=941601
END=1227260
title=mytitle3


  


  I use the ffmpeg -i INPUT.mp4 -i FFMETADATAFILE.txt -map_metadata 1 -codec copy OUTPUT.mp4 command to encode the metadata to my video file, and for some reason I only ever get 'Chapter 0', 'Chapter 1', and 'Chapter 2'.

  


  I tried using the -map_chapters 1 argument as well but results have been unchanged.

  


  I am using the Latest Auto-Build (2023-10-14 13:02) Windows build by BtbN. Thanks in advance for the help.

  


• ffmpeg - store desired output to python variable

  15 janvier 2024, par Chris P

  If i run : ffmpeg -list_devices true -f dshow -i dummy i get :

  


  ffmpeg version 2023-01-30-git-2d202985b7-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-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      57. 44.100 / 57. 44.100
  libavcodec     59. 59.100 / 59. 59.100
  libavformat    59. 36.100 / 59. 36.100
  libavdevice    59.  8.101 / 59.  8.101
  libavfilter     8. 56.100 /  8. 56.100
  libswscale      6.  8.112 /  6.  8.112
  libswresample   4.  9.100 /  4.  9.100
  libpostproc    56.  7.100 / 56.  7.100
[dshow @ 00000236357d0480] "HP True Vision HD Camera" (video)
[dshow @ 00000236357d0480]   Alternative name "@device_pnp_\\?\usb#vid_04f2&pid_b6ab&mi_00#6&763f234&2&0000#{65e8773d-8f56-11d0-a3b9-00a0c9223196}\global"
[dshow @ 00000236357d0480] "Microphone Array (Intel® Smart Sound Technology for Digital Microphones)" (audio)
[dshow @ 00000236357d0480]   Alternative name "@device_cm_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\wave_{E8824DE9-F848-47F1-BB2A-EB24E11050FC}"
dummy: Immediate exit requested


  


  From this output i want to store : "HP True Vision HD Camera" (first video output) in a python variable.

  


  Is this possible ?

  


  I am trying

  


  import subprocess
ffmpeg_command = ["ffmpeg", "-list_devices", "true","-f", "dshow", "-i", "dummy"]
pipe = subprocess.run(ffmpeg_command,stdout=subprocess.PIPE,stderr=subprocess.PIPE,bufsize=10**8)
output = pipe.stdout
lines = output.splitlines()
for line in lines:
    if line.startswith("[dshow @"):
        if "(video)" in line:
            camera_info = line.split("\"")[1]
            print(camera_info)