Ffmpeg/Ffplay: simultaneous playback of two videos, or video+histogram?

[zopiro]

Is it possible to play two videos side by side simultaneously on ffplay? How would you do that?

Also, is it possible to use ffplay to display histogram (with -vf histogram flag) and show histogram and video image side by side?

[Budman1]

Yes it is possible, IF you have the latest Avisynth 2.6. Otherwise it tells you this when you try to run the ffplay with avs script.

DirectShowSource("C:\Users\Bud\Desktop\Frame.mpg") .ConvertToYV12
Histogram("Color")



You can also play scripts that stack and compare more:

[Selur]

for a sample with a hight of 720, this:

ffplay "h:\sample.mkv" -an -vf "split[src][b];[b]histogram,scale=-1:720[filt]; [src][filt] hstack"

will:

• split the input into two sources 'src' an 'b'
• create the histogram of 'b' and scale the histogram to a height of 720 and name that output 'filt' (to make sure that the histogram and 'src' have the same height)
• horizontally stack 'src' and 'filt'

-> no need for avisynth to answer a ffmpeg question

Cu Selur

[Budman1]

Thanks to Selur for the Direct ffplay method. I've added that to my notes for the future.

-> no need for avisynth to answer a ffmpeg question

The suggestion for avisynth was just an alternate method that uses a very simple script that seemed, to me, easy to understand, memorize and change for other videos. It also takes care of the resizing and stacking functions automatically.

[Selur]

Sorry, but using DirectShowSource normally just looks like a BAD idea to me,..