[FFmpeg-devel] [PATCH] lavfi: add drawgraph filter

[Paul B Mahol]

On 6/28/15, Dave Rice <dave at dericed.com> wrote:
> Hi,
>
>> On Jun 27, 2015, at 4:52 PM, Paul B Mahol <onemda at gmail.com> wrote:
>>
>> Signed-off-by: Paul B Mahol <onemda at gmail.com>
>> ---
>> doc/filters.texi           |  76 ++++++++++++
>> libavfilter/Makefile       |   1 +
>> libavfilter/allfilters.c   |   1 +
>> libavfilter/vf_drawgraph.c | 297
>> +++++++++++++++++++++++++++++++++++++++++++++
>> 4 files changed, 375 insertions(+)
>> create mode 100644 libavfilter/vf_drawgraph.c
>>

[...]

>
> With this version using a color name for foreground no longer works:
>
> This works:
> ffplay -f lavfi -i mandelbrot -vf
> signalstats,drawgraph=metadata=lavfi.signalstats.YAVG:min=0:max=255:slide=scroll:bg=green:fg=0x0000FF
>
> This doesn't:
> ffplay -f lavfi -i mandelbrot -vf
> signalstats,drawgraph=metadata=lavfi.signalstats.YAVG:min=0:max=255:slide=scroll:bg=green:fg=red

AFAIK The expressions can not work with strings.

>
> Also here's an example with blend:
> ffplay -f lavfi -i mandelbrot -vf "signalstats,split=3[a][b][c];\
> [a]drawgraph=metadata=lavfi.signalstats.YAVG:min=0:max=255:slide=scroll:fg=0xFFFF0000:mode=dot[a1];\
> [b]drawgraph=metadata=lavfi.signalstats.UAVG:min=0:max=255:slide=scroll:fg=0xFF00FF00:mode=dot[b1];\
> [c]drawgraph=metadata=lavfi.signalstats.VAVG:min=0:max=255:slide=scroll:fg=0xFFFFFF00:mode=dot[c1];\
> [a1][b1]blend=and[ab];[ab][c1]blend=and[out]"
>

The blending kills difference in colors so I may add multiple graphs
support for filter.

> Thanks,
> Dave Rice
>
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