Recherche avancée

Sur d’autres sites (7547)

• Revision 028e5c6ac67357a01f622c5bb3b9a20510f695ff : Validateur intégré : pouvoir filtrer les fichiers d’un répertoire plus ...

  20 août 2010, par Committo,Ergo:sum — Log

  Validateur intégré : pouvoir filtrer les fichiers d’un répertoire plus finement que par l’extension, et indiquer le nombre de fichiers fautifs. Et améliorer la présentation (mais faudrait passer par le feuille de style un jour). git-svn-id : svn ://trac.rezo.net/spip/branches/spip-2.1@15957 (...)

• 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]

• Can someone decode my widevine Mpeg Dash stream if he got a hold of the decoded init data and/or the widevine licence key ?

  27 décembre 2017, par Jawny Thompson

  Lets say somebody downloads multiple segments of my widevine DRM stream :

  • Segment01.m4s

  • Segment02.m4s

  • Segment...n.m4s

  And he somehow got a hold of the decoded initialization header data for that particular stream, what is he able to do with it ? Can he use it to decode the segments he downloaded ? If not, what are possible ways he could do it, and how do i prevent such thing from happening.