Make DCPExaminer::size() optional and deal with the consequences.v2.16.78

This means we can fix the case of a VF having no known size in a nice way,
in turn fixing problems caused by the fix to #2775.

1 files changed, 5 insertions, 2 deletions

diff --git a/src/lib/ffmpeg_decoder.cc b/src/lib/ffmpeg_decoder.cc
index 0d43156c0..7f7a07863 100644
--- a/src/lib/ffmpeg_decoder.cc
+++ b/src/lib/ffmpeg_decoder.cc
@@ -828,11 +828,14 @@ FFmpegDecoder::process_ass_subtitle (string ass, ContentTime from)
 	}
 
 	sub::RawSubtitle base;
+	auto video_size = _ffmpeg_content->video->size();
+	DCPOMATIC_ASSERT(video_size);
+
 	auto raw = sub::SSAReader::parse_line (
 		base,
 		text,
-		_ffmpeg_content->video->size().width,
-		_ffmpeg_content->video->size().height,
+		video_size->width,
+		video_size->height,
 		sub::Colour(1, 1, 1)
 		);