fftools/graphprint: Add execution graph printing

The key benefits are:

- Different to other graph printing methods, this is outputting:
  - all graphs with runtime state
    (including auto-inserted filters)
  - each graph with its inputs and outputs
  - all filters with their in- and output pads
  - all connections between all input- and output pads
  - for each connection:
    - the runtime-negotiated format and media type
    - the hw context
    - if video hw context, both: hw pixfmt + sw pixfmt
- Output can either be printed to stdout or written to specified file
- Output is machine-readable
- Use the same output implementation as ffprobe, supporting multiple
  formats

Signed-off-by: softworkz <softworkz@hotmail.com>

fftools/ffmpeg_opt.c

@@ -47,6 +47,7 @@
 #include "libavutil/opt.h"
 #include "libavutil/parseutils.h"
 #include "libavutil/stereo3d.h"
+#include "graph/graphprint.h"
 
 HWDevice *filter_hw_device;
 
@@ -75,6 +76,9 @@ float max_error_rate  = 2.0/3;
 char *filter_nbthreads;
 int filter_complex_nbthreads = 0;
 int vstats_version = 2;
+int print_graphs = 0;
+char *print_graphs_file = NULL;
+char *print_graphs_format = NULL;
 int auto_conversion_filters = 1;
 int64_t stats_period = 500000;
 
@@ -1735,6 +1739,15 @@ const OptionDef options[] = {
         { .func_arg = opt_filter_complex_script },
         "deprecated, use -/filter_complex instead", "filename" },
 #endif
+    { "print_graphs",   OPT_TYPE_BOOL, 0,
+        { &print_graphs },
+        "print execution graph data to stderr" },
+    { "print_graphs_file", OPT_TYPE_STRING, 0,
+        { &print_graphs_file },
+        "write execution graph data to the specified file", "filename" },
+    { "print_graphs_format", OPT_TYPE_STRING, 0,
+        { &print_graphs_format },
+      "set the output printing format (available formats are: default, compact, csv, flat, ini, json, xml, mermaid, mermaidhtml)", "format" },
     { "auto_conversion_filters", OPT_TYPE_BOOL, OPT_EXPERT,
         { &auto_conversion_filters },
         "enable automatic conversion filters globally" },