player: enable cache and demuxer thread for subtitles too

Includes some logic for not starting the demuxer thread for fully read
subtitles. (Well, the cache will still waste _lots_ of resources, and
the cache always has to be created, because we don't know whether it'll
be needed _before_ opening the file.)

See #1597.

1 files changed, 1 insertions, 0 deletions

diff --git a/demux/demux_subreader.c b/demux/demux_subreader.c
index 145754be6d..4ea5bb9c43 100644
--- a/demux/demux_subreader.c
+++ b/demux/demux_subreader.c
@@ -791,6 +791,7 @@ static int d_open_file(struct demuxer *demuxer, enum demux_check check)
     subdata_free(sd);
 
     demuxer->seekable = true;
+    demuxer->fully_read = true;
 
     return 0;
 }