ffmpeg: copy subtitles frame dimensions.

The sub-movtextenc ref file changes because the dimensions
(400×60) are stored by the format.

1 files changed, 4 insertions, 0 deletions

diff --git a/ffmpeg.c b/ffmpeg.c
index 5aeaba217a..043f68cb52 100644
--- a/ffmpeg.c
+++ b/ffmpeg.c
@@ -2188,6 +2188,10 @@ static int transcode_init(void)
                 break;
             case AVMEDIA_TYPE_SUBTITLE:
                 codec->time_base = (AVRational){1, 1000};
+                if (!codec->width) {
+                    codec->width     = input_streams[ost->source_index]->st->codec->width;
+                    codec->height    = input_streams[ost->source_index]->st->codec->height;
+                }
                 break;
             default:
                 abort();