sdk, rebroadcast: support specifying custom ffmpeg path

plugins/prebuffer-mixin/src/ffmpeg-rebroadcast.ts

@@ -190,7 +190,7 @@ export async function startParserSession<T extends string>(ffmpegInput: FFmpegIn
     // start ffmpeg process with child process pipes
     args.unshift('-hide_banner');
     safePrintFFmpegArguments(console, args);
-    const cp = child_process.spawn(await mediaManager.getFFmpegPath(), args, {
+    const cp = child_process.spawn(ffmpegInput.ffmpegPath || await mediaManager.getFFmpegPath(), args, {
         stdio,
         env,
     });

sdk/types/scrypted_python/scrypted_sdk/types.py

@@ -519,6 +519,7 @@ class FFmpegInput(TypedDict):
     container: str
     destinationVideoBitrate: float
     env: Any  # Environment variables to set when launching FFmpeg.
+    ffmpegPath: str  # Path to a custom FFmpeg binary.
     h264EncoderArguments: list[str]
     h264FilterArguments: list[str]
     inputArguments: list[str]

sdk/types/src/types.input.ts

@@ -1707,6 +1707,10 @@ export interface FFmpegInput extends MediaContainer {
    * Environment variables to set when launching FFmpeg.
    */
   env?: { [key: string]: string };
+  /**
+   * Path to a custom FFmpeg binary.
+   */
+  ffmpegPath?: string;
 }
 export interface DeviceInformation {
   model?: string;