fix: HLS MP4 seek

media-kit/media-kit#395

Author: alexmercerind

buildscripts/patches/ffmpeg/hls_mp4_seek.patch

@@ -0,0 +1,14 @@
+diff --git a/libavformat/hls.c b/libavformat/hls.c
+index 2a2fe28a540f..c625e3029116 100644
+--- a/libavformat/hls.c
++++ b/libavformat/hls.c
+@@ -2506,6 +2506,9 @@ static int hls_read_seek(AVFormatContext *s, int stream_index,
+         /* Flush the packet queue of the subdemuxer. */
+         ff_read_frame_flush(pls->ctx);
+ 
++        /* Reset the init segment so it's re-fetched and served appropiately */
++        pls->cur_init_section = NULL;
++
+         pls->seek_timestamp = seek_timestamp;
+         pls->seek_flags = flags;
+