drawgraph
Draw a graph using input video metadata.
It accepts the following parameters:
- m1
Set 1st frame metadata key from which metadata values will be used to draw a graph.
- fg1
Set 1st foreground color expression.
- m2
Set 2nd frame metadata key from which metadata values will be used to draw a graph.
- fg2
Set 2nd foreground color expression.
- m3
Set 3rd frame metadata key from which metadata values will be used to draw a graph.
- fg3
Set 3rd foreground color expression.
- m4
Set 4th frame metadata key from which metadata values will be used to draw a graph.
- fg4
Set 4th foreground color expression.
- min
Set minimal value of metadata value.
- max
Set maximal value of metadata value.
- bg
Set graph background color. Default is white.
- mode
Set graph mode.
Available values for mode is:
- ‘bar’
- ‘dot’
- ‘line’
Default is
line.- slide
Set slide mode.
Available values for slide is:
- ‘frame’
Draw new frame when right border is reached.
- ‘replace’
Replace old columns with new ones.
- ‘scroll’
Scroll from right to left.
- ‘rscroll’
Scroll from left to right.
- ‘picture’
Draw single picture.
Default is
frame.- size
Set size of graph video. For the syntax of this option, check the (ffmpeg-utils)"Video size" section in the ffmpeg-utils manual. The default value is
900x256.- rate, r
Set the output frame rate. Default value is
25.The foreground color expressions can use the following variables:
- MIN
Minimal value of metadata value.
- MAX
Maximal value of metadata value.
- VAL
Current metadata key value.
The color is defined as 0xAABBGGRR.
Example using metadata from signalstats filter:
signalstats,drawgraph=lavfi.signalstats.YAVG:min=0:max=255
Example using metadata from ebur128 filter:
ebur128=metadata=1,adrawgraph=lavfi.r128.M:min=-120:max=5