[Libav-user] how to get text_h and text_w from vf_drawtext

[qw]

Hi,

http://ffmpeg.org/doxygen/2.8/vf__drawtext_8c.html#a65f3f8df0fa6740ed48a631c89cde373

static int filter_frame(AVFilterLink *inlink, AVFrame *frame)

In the end of the above function,  text_w and text_h are shown, which are stored in DrawTextContext:var_values[VAR_TEXT_W] and DrawTextContext:var_values[VAR_TEXT_H].

How to get the two value via ffmpeg lib, i.e. DrawTextContext:var_values[VAR_TEXT_W] and DrawTextContext:var_values[VAR_TEXT_H]?

B.R.

Andrew
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