[FFmpeg-trac] #325(avfilter:new): Aspect Ratio of input Video required to e.g. automatically add correct letterbox/pillarbox when rescaling video

[FFmpeg]

#325: Aspect Ratio of input Video required to e.g. automatically add correct
letterbox/pillarbox when rescaling video
----------------------+--------------------------
 Reporter:  Pae8uuW5  |        Type:  enhancement
   Status:  new       |    Priority:  normal
Component:  avfilter  |     Version:  0.8
 Keywords:            |  Blocked By:
 Blocking:            |  Reproduced:  0
 Analyzed:  0         |
----------------------+--------------------------
 When converting videos of unknown size and aspect ratio, one needs to know
 the  aspect ratio of the source video to calculate the size of letterbox
 or pillarbox bars to be added (if any). For source videos with non square
 pixels, a alone, which is just in_w/in_h, is insufficient. The trivial
 patch enclosed below adds a new variable "d" (rename as you like) to
 represent the input sample aspect ratio. With this, one can use a simple
 chain of a scale and a pad filter to always add correct
 pillar/letterboxes.

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/325>
FFmpeg <http://ffmpeg.org>
FFmpeg issue tracker