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• yuv420p10le format using ffmpeg without green background in web browser

  16 août 2021, par OneWorld

  I just rebuilt ffmpeg, and generated a yuv420p10le video. Below is a snapshot from the video.

  


  

  


  It seems to display a green background in chrome when I play it. However, if I switch hardware acceleration off in Chrome, the background appears white. Also if I play the video in VLC player the background is white.

  


  I was wondering if there is a way within ffmpeg to get yuv420p10le to show backgrounds as white in browsers without needing to do anything special in the browser settings ?

  


  My ffmpeg configuration is as follows :-

  


  ffmpeg -i after_building_ffmpeg.mp4
ffmpeg version N-103222-gf040c1ec4e Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 7 (Ubuntu 7.5.0-3ubuntu1~18.04)
  configuration: --enable-gpl --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-librtmp --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree --enable-version3 --enable-libxcb
  libavutil      57.  3.100 / 57.  3.100
  libavcodec     59.  4.101 / 59.  4.101
  libavformat    59.  4.101 / 59.  4.101
  libavdevice    59.  0.100 / 59.  0.100
  libavfilter     8.  1.103 /  8.  1.103
  libswscale      6.  0.100 /  6.  0.100
  libswresample   4.  0.100 /  4.  0.100
  libpostproc    56.  0.100 / 56.  0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'after_building_ffmpeg.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf59.4.101
  Duration: 00:00:03.00, start: 0.000000, bitrate: 5893 kb/s
  Stream #0:0(und): Video: h264 (High 10) (avc1 / 0x31637661), yuv420p10le(tv, gbr/unknown/unknown), 1400x1400 [SAR 1:1 DAR 1:1], 5888 kb/s, 25 fps, 25 tbr, 12800 tbn (default)
    Metadata:
      handler_name    : VideoHandler
      vendor_id       : [0][0][0][0]


  


• How to configure FFmpeg in windows ? [closed]

  2 août 2021, par GrassWarlock

  Hey there i'm not very tech savvy.

  


  when i invoke this command :

  


  ffmpeg -i input.mp4 -i subtitles.srt -map 0 -map 1 -c copy -c:v libx264 -crf 23 -preset veryfast output.mp4


  


  ( which is supposed to overlay 'input.mp4' with subtitles from 'subtitle.srt' )

  


  i get the following output :

  


  ffmpeg version 2021-07-27-git-0068b3d0f0-full_build-www.gyan.dev Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 10.3.0 (Rev5, 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-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libdav1d --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libglslang --enable-vulkan --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.  2.100 / 57.  2.100
  libavcodec     59.  3.102 / 59.  3.102
  libavformat    59.  4.101 / 59.  4.101
  libavdevice    59.  0.100 / 59.  0.100
  libavfilter     8.  1.103 /  8.  1.103
  libswscale      6.  0.100 /  6.  0.100
  libswresample   4.  0.100 /  4.  0.100
  libpostproc    56.  0.100 / 56.  0.100
Input #0, matroska,webm, from 'video.mkv':
  Metadata:
    ENCODER         : Lavf59.4.101
  Duration: 00:05:39.94, start: 0.000000, bitrate: 665 kb/s
  Stream #0:0(eng): Video: vp9 (Profile 0), yuv420p(tv), 720x480, SAR 1:1 DAR 3:2, 29.97 fps, 29.97 tbr, 1k tbn (default)
    Metadata:
      DURATION        : 00:05:39.839000000
  Stream #0:1: Audio: aac (LC), 44100 Hz, stereo, fltp (default)
    Metadata:
      HANDLER_NAME    : SoundHandler
      VENDOR_ID       : [0][0][0][0]
      DURATION        : 00:05:39.940000000
Input #1, srt, from 'subtitles.srt':
  Duration: N/A, bitrate: N/A
  Stream #1:0: Subtitle: subrip
[mp4 @ 000001aa596242c0] Could not find tag for codec subrip in stream #2, codec not currently supported in container
Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
Error initializing output stream 0:2 --
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (copy)
  Stream #1:0 -> #0:2 (copy)
    Last message repeated 1 times


  


  i searched the internet and the official documentation mentions that libass should be enabled in the configuration in order for subtitling to work

  


  


  11.218 subtitles

  


  Draw subtitles on top of input video using the libass library.

  


  To enable compilation of this filter you need to configure FFmpeg with
—enable-libass. This filter also requires a build with libavcodec and libavformat to convert the passed subtitles file to ASS (Advanced
Substation Alpha) subtitles format

  


  


  how do i enable libass in configuration on windows ? my FFmpeg directory doesn't contain a configuration file nor a command that configures it from cmd

  


  Thanks alot in advance

  


• how to record screen using ffmpeg with variable framerate

  20 mai 2024, par AJ Dev

  I want to record desktop using ffmpeg with variable framerate.

  


  set a limit of fps to 120fps
now ffmpeg handle automatically that my max limit is 120
if pc is highly configured then record to 120
otherwise record auto fps like 5,10 whatever

  


  i searched on google i found -vsync 2 and -vsync vfr but these are not working.

  


  my command is

  


  ffmpeg -use_wallclock_as_timestamps 1 -re -vsync vfr -thread_queue_size 1024 -rtbufsize 1024 -indexmem 1024 -probesize 32 -analyzeduration 0 -framerate 120 -f rawvideo -pix_fmt rgb32 -video_size 1366x768 -i \.\pipe\testscreen-4c0b1a88-d4d0-4f6a-55a6-c4587a0ccb7c3 -async 1 -thread_queue_size 1024 -rtbufsize 1024 -indexmem 1024 -probesize 32 -f s16le -acodec pcm_s16le -ar 44100 -ac 2 -i \.\pipe\testscreen-d185c2a9-ac89-4966-b8d7-cec897848790 -fflags +genpts -fflags nobuffer -r 120 -vcodec libx264 -crf 21 -pix_fmt yuv420p -preset ultrafast -b:v 0 -maxrate 0 -bf 0 -profile:v high -x264opts "keyint=300:bframes=0:sliced_threads=1:slices=4:lookahead_threads=4:threads=4" -tune zerolatency -movflags +faststart -y -fflags +genpts -c:a aac -strict -2 -b:a 128k "C :\2021-08-16_13-21-38-815.mp4"