Recherche avancée

Sur d’autres sites (5202)

• configure : Disable direct stripping for AIX.

  12 avril 2018, par Carl Eugen Hoyos

  configure : Disable direct stripping for AIX.
  AIX strip doesn't know the option -o.
  

  • [DH] configure

• FFmpeg get a crop without tying it to a specific time period

  30 avril 2021, par Дмитрий Варзанов

  crop = sub.check_output("ffmpeg -i "+file+" -ss 5 -t 30  -vf cropdetect -f null - 2>&1 | awk '/crop/ { print  $NF }' | tail -1", shell=True).decode().strip()


  


  In order not to bind to a time interval, it is possible to analyze the frames for the entire time period of the video file.

  


  It would be a solution if this process was performed quickly, instantly. But unfortunately, it can take hours, depending on the duration of the video

  


  Execute the command to get the duration of the video, and then calculate and set the time to get the crop. We'll have to build forests...

  


  I am looking for a solution in which there will be no need to set the time and at the same time the task will take the least amount of time.

  


  Perhaps someone has a solution ?

  


• ffmpeg - color-grading video material AND display original source as picture-in-picture, using -filter_complex

  5 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 to 50% or even 30%), in the bottom-right 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 TMP output which then gets combined, with the original, in a final PIP creation process.
  Your help combining these two separate steps into one single "-filter_complex" action 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 %TMP% -i %INPUT% -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]