libobs: Copy metadata for tracks/streams when remuxing

libobs/media-io/media-remux.c

@@ -109,6 +109,8 @@ static inline bool init_output(media_remux_job_t job, const char *out_filename)
 		}
 		out_stream->time_base = out_stream->codec->time_base;
 
+		av_dict_copy(&out_stream->metadata, in_stream->metadata, 0);
+
 		out_stream->codec->codec_tag = 0;
 		if (job->ofmt_ctx->oformat->flags & AVFMT_GLOBALHEADER)
 			out_stream->codec->flags |= CODEC_FLAG_GLOBAL_H;