Recherche avancée

Sur d’autres sites (4358)

• Combine with ffmpeg two or more images that overlap

  22 décembre 2017, par Smeterlink

  Having two or more images that overlap, like in this screenshot, I want to combine/merge them into one :

  

  The result I want is like using the"Auto-Blend Layers" command from Adobe Photoshop :

  https://helpx.adobe.com/photoshop/using/combine-images-auto-blend-layers.html

• ffmpeg - convert movie AND show original input (as resized picture-in-picture, top-left corner) in the final output file

  2 octobre 2019, par raven

  this is my first post on this forum, so please be gentle in case I accidentally do trip over any forum rules that I would not know of yet :).

  I would like to apply some color-grading to underwater GoPro footage. To quicker gauge the effect of my color settings (trial-and-error, as of yet), would like to see the original input video stream as a PIP (e.g., scaled down 50%), in the top-left corner of the converted output movie.

  I have one input movie that is going to be color graded. The PIP should use the original as an input, just a scaled-down version of it.

  I would like to use ffmpeg’s -filter_complex option to do the PIP, but all examples I can find on "-filter_complex" would use two already existing movies. Instead, I would like to make the color-corrected stream an on-the-fly input to "-filter_complex", which then renders the PIP.

  Is that doable, all in one go ?

  Both the individual snippets below work fine, I now would like to combine these and skip the creation of an intermediate color-graded video. Your help combining these two steps into one single process is greatly appreciated !

  Thanks in advance,
  raven.

  [existing code snippets (M$ batch files)]
  
  
  
  ::declarations/defines::
  
  set "INPUT="
  
  set "TMP="
  
  set "OUTPUT="
  
  set "FFMPG="
  
  set "QU=9" :: quality settings
  
  
  
  set "CONV='"0 -1 0 -1 5 -1 0 -1 0:0 -1 0 -1 5 -1 0 -1 0:0 -1 0 -1 5 -1 
  
  0 -1 0:0 -1 0 -1 5 -1 0 -1 0'"" :: sharpening convolution filter
  
  
  
  ::color-grading part::
  
  %FFMPG% -i %INPUT% -vf convolution=%CONV%,colorbalance=rs=%rs%:gs=%gs%:bs=%bs%:rm=%rm%:gm=%gm%:bm=%bm%:rh=%rh%:gh=%gh%:bh=%bh% -q:v %QU% -codec:v mpeg4 %TMP%
  
  
  
  ::PIP part::
  
  %FFMPG% -i %INPUT% -i %TMP% -filter_complex "[1]scale=iw/3:ih/3 
  
  [pip]; [0][pip] overlay=main_w-overlay_w-10:main_h-overlay_h-10" -q:v 
  
  %QU% -codec:v mpeg4 %OUTPUT%
  
  
  
  [/existing code]

• ASS/SSA subtitles hard coded using ffmpeg are highly antialiased

  1er août 2024, par Adorn

  I am using ASS/SSA format for hard coding captions on the video. These are relevant parts of my .ass file :

  


  Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, OutlineColour, BackColour, Bold, Italic, Underline, StrikeOut, ScaleX, ScaleY, Spacing, Angle, BorderStyle, Outline, Shadow, Alignment, MarginL, MarginR, MarginV, Encoding
Style: s0, Montserrat-Black, 60, &H0015CCFA, &H001C1CB9, &H77000000, &H00000000, 1, 0, 0, 0, 100, 100, , 0, 1, 2, 2 , 2, 0, 0, 0, 1

[Events]
Format: Start, End, Style, Text
Dialogue: 00:0:43.8,00:0:46.55,s0,{\pos(540,1550)\fscx50\fscy50\t(0,100,\fscx100\fscy100)\org(10540,-8450)\t(100,600,\frz0.10)\t(600,1100,\frz-0.10)\t(1100,1600,\frz0.10)\t(1600,2100,\frz-0.10)\t(2100,2600,\frz0.10)\t(2600,3100,\frz-0.10)\t(3100,3600,\frz0.10)\k3463}ME FOR WHATEVER


  


  And to hard code on the video, I use following ffmpeg command :

  


  ffmpeg -i video_filepath -vf ass={ass_filepath} -c:a copy -y out_path


  


  This works as intended, except the captions are highly antialiased.

  


  

  


  By the way, no AI Assistant has solved this. Tried ChatGPT / Claude / llama 3.1.