mtmd : add video input support (#24269)

* wip

* ok: lazy bitmap API

* remember to free lazy text

* wip

* add mtmd_helper_video

* support video input on server (base64 input)

* add MTMD_VIDEO config

* add timestamp

* update CLI

* cli: allow auto-completion for video

* add --video arg

* fix build

* update docs

* rename as suggested

tools/mtmd/CMakeLists.txt

@@ -1,5 +1,8 @@
 # mtmd
 
+set(MTMD_VIDEO ON CACHE BOOL "enable video support in mtmd (requires ffmpeg binary in PATH)")
+# TODO: add MTMD_VIDEO_METHOD in the future to select between ffmpeg and other backends
+
 find_package(Threads REQUIRED)
 
 add_library(mtmd
@@ -63,6 +66,10 @@ target_include_directories(mtmd PRIVATE ../..)
 target_include_directories(mtmd PRIVATE ../../vendor)
 target_compile_features   (mtmd PRIVATE cxx_std_17)
 
+if (MTMD_VIDEO)
+    target_compile_definitions(mtmd PRIVATE MTMD_VIDEO)
+endif()
+
 if (BUILD_SHARED_LIBS)
     set_target_properties     (mtmd PROPERTIES POSITION_INDEPENDENT_CODE ON)
     target_compile_definitions(mtmd PRIVATE LLAMA_BUILD)