Recherche avancée

Sur d’autres sites (4515)

• avfilter/vf_lensfun : add scale parameter

  25 mars 2019, par Daniel Playfair Cal

  avfilter/vf_lensfun : add scale parameter
  The lensfun filter wraps the lensfun library which performs
  
  transformations on videos to correct for lens distortion. Often this
  
  results in areas in the input being mapped to areas that fall outside
  
  the boundaries of the output. The library has a parameter called scale
  
  which is a scale factor applied to the output video. By decreasing it it
  
  is possible to regain the areas of the video which would otherwise have
  
  been lost. There is a special value of 0 which indicates that the
  
  library should automatically determine a scale factor that results in
  
  the output frame being filled (i.e. little or no black/unmapped areas).
  This patch adds a corresponding scale option to the lensfun filter which
  
  is passed through to the library. The existing behaviour of using the
  
  automatic value of 0 is retained as the default behaviour, while other
  
  values will be passed through to the library.
  Signed-off-by : Daniel Playfair Cal <daniel.playfair.cal@gmail.com>
  

  • [DH] doc/filters.texi
  • [DH] libavfilter/vf_lensfun.c

• scale a video to multiple qualities and add watermark

  8 mars 2019, par jared zek

  hello I have a ffmpeg command that scales a video to 2 different qualities and adds a watermark, the problem here is that the watermark is scaled along with the videos and it looks horrible

  D:\electron\brenda\node_modules\ffmpeg-static\bin\win32\x64\ffmpeg.exe -i C:\Users\Andy\Desktop\entrada\videoplayback.mp4 -i C:\Users\Andy\Desktop\entrada\marca.png -filter_complex [0:0]scale=854:480[wm]; [wm][1:0]overlay=x=0:y=0[out] -map [out] -map 0:a -movflags faststart -preset fast -y C:\Users\Andy\Desktop\salida/480_videoplayback.mp4 -filter_complex [0:0]scale=640:360[wm]; [wm][1:0]overlay=x=0:y=0[out] -map [out] -map 0:a -movflags faststart -preset fast -y C:\Users\Andy\Desktop\salida/360_videoplayback.mp4

  video scaled to 360 with watermark

  I want the watermark to remain in its original size and not escalate with the video, thank you for your help I’ve been here for hours

• FFMPEG Scale video without filtering

  24 août 2023, par honi

  I am interested in scaling a video to a larger size without applying any filter or anything. The output video should look very pixelated. How do I do this in FFMPEG ?

  



  On the suggestion of Ronald S. Bultje, I am using the neighbor flag. I have also decided to use the rawvideo codec to avoid compression.

  



  The current command I am running is

  



  ffmpeg -i vid.avi -s 800x800 -sws_flags neighbor -sws_dither none -vcodec rawvideo vid2.avi


  



  The command line output of that command is

  



  ffmpeg version 2.7 Copyright (c) 2000-2015 the FFmpeg developers
  built with Apple LLVM version 6.1.0 (clang-602.0.53) (based on LLVM 3.6.0svn)
  configuration: --prefix=/opt/local --enable-swscale --enable-avfilter --enable-avresample --enable-libmp3lame --enable-libvorbis --enable-libopus --enable-libtheora --enable-libschroedinger --enable-libopenjpeg --enable-libmodplug --enable-libvpx --enable-libspeex --enable-libass --enable-libbluray --enable-lzma --enable-gnutls --enable-fontconfig --enable-libfreetype --enable-libfribidi --disable-indev=jack --disable-outdev=xv --mandir=/opt/local/share/man --enable-shared --enable-pthreads --cc=/usr/bin/clang --enable-vda --arch=x86_64 --enable-yasm --enable-gpl --enable-postproc --enable-libx264 --enable-libxvid
  libavutil      54. 27.100 / 54. 27.100
  libavcodec     56. 41.100 / 56. 41.100
  libavformat    56. 36.100 / 56. 36.100
  libavdevice    56.  4.100 / 56.  4.100
  libavfilter     5. 16.101 /  5. 16.101
  libavresample   2.  1.  0 /  2.  1.  0
  libswscale      3.  1.101 /  3.  1.101
  libswresample   1.  2.100 /  1.  2.100
  libpostproc    53.  3.100 / 53.  3.100
Input #0, avi, from 'vid.avi':
  Duration: 00:00:25.00, start: 0.000000, bitrate: 226 kb/s
    Stream #0:0: Video: rawvideo, pal8, 80x80, 206 kb/s, 4 fps, 4 tbr, 4 tbn, 4 tbc
File 'vid2.avi' already exists. Overwrite ? [y/N] y
Output #0, avi, to 'vid2.avi':
  Metadata:
    ISFT            : Lavf56.36.100
    Stream #0:0: Video: rawvideo, pal8, 800x800, q=2-31, 200 kb/s, 4 fps, 4 tbn, 4 tbc
    Metadata:
      encoder         : Lavc56.41.100 rawvideo
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> rawvideo (native))
Press [q] to stop, [?] for help
frame=  100 fps=0.0 q=0.0 Lsize=   62608kB time=00:00:25.00 bitrate=20515.4kbits/s    
video:62600kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.012614%