libavformat: Set the default for the max_delay option to -1

Make the muxers/demuxers that use the field handle the default
-1 in the same way as 0.

This allows distinguishing an intentionally set 0 from the default
value where the user hasn't set it.

Signed-off-by: Martin Storsjö <martin@martin.st>

1 files changed, 2 insertions, 0 deletions

diff --git a/libavformat/mpegenc.c b/libavformat/mpegenc.c
index 852b3f13c9..bda8d8324b 100644
--- a/libavformat/mpegenc.c
+++ b/libavformat/mpegenc.c
@@ -318,6 +318,8 @@ static int mpeg_mux_init(AVFormatContext *ctx)
         s->packet_size = ctx->packet_size;
     } else
         s->packet_size = 2048;
+    if (ctx->max_delay < 0) /* Not set by the caller */
+        ctx->max_delay = 0;
 
     s->vcd_padding_bytes_written = 0;
     s->vcd_padding_bitrate=0;