Fix a number of GCC warnings

plugins/obs-ffmpeg/obs-ffmpeg-audio-encoders.c

@@ -249,8 +249,9 @@ static void *enc_create(obs_data_t *settings, obs_encoder_t *encoder,
 	}
 
 	info("bitrate: %" PRId64 ", channels: %d, channel_layout: %x\n",
-			enc->context->bit_rate / 1000, enc->context->channels,
-			enc->context->channel_layout);
+			(int64_t)enc->context->bit_rate / 1000,
+			(int)enc->context->channels,
+			(unsigned int)enc->context->channel_layout);
 
 	init_sizes(enc, audio);
 

plugins/obs-ffmpeg/obs-ffmpeg-source.c

@@ -31,9 +31,6 @@
 #define FF_BLOG(level, format, ...) \
 	FF_LOG_S(s->source, level, format, ##__VA_ARGS__)
 
-static bool video_frame(struct ff_frame *frame, void *opaque);
-static bool video_format(AVCodecContext *codec_context, void *opaque);
-
 struct ffmpeg_source {
 	mp_media_t media;
 	bool media_valid;