player: move code for skipping 0-sized video packets to demuxer

These packets have to be explicitly dropped, because usually libavcodec
uses 0-sized packets to flush delayed frames, meaning just passing
through these packets would have bad consequences.

Normally, libavformat doesn't output 0-sized packets anyway. But I don't
want to take any chances, so don't delete it, and just move it out of
the way to demux.c.

1 files changed, 8 insertions, 0 deletions

diff --git a/demux/demux.c b/demux/demux.c
index 467b016699..bfa999ab15 100644
--- a/demux/demux.c
+++ b/demux/demux.c
@@ -318,6 +318,14 @@ int demuxer_add_packet(demuxer_t *demuxer, struct sh_stream *stream,
         return 0;
     }
 
+    if (stream->type == STREAM_VIDEO && !dp->len) {
+        /* Video packets with size 0 are assumed to not correspond to frames,
+         * but to indicate the absence of a frame in formats like AVI
+         * that must have packets at fixed timestamp intervals. */
+        talloc_free(dp);
+        return 1;
+    }
+
     dp->stream = stream->index;
     dp->next = NULL;