+++ /dev/null
-diff -ur a/libavformat/avformat.h b/libavformat/avformat.h
---- a/libavformat/avformat.h 2017-06-06 20:03:55.000000000 -0600
-+++ b/libavformat/avformat.h 2017-07-20 09:10:40.434571231 -0600
-@@ -504,6 +504,9 @@
- The user or muxer can override this through
- AVFormatContext.avoid_negative_ts
- */
-+#define AVFMT_SEEK_NOSTREAMS 0x80000 /**< Stream index ignored by seek,
-+ or some streams fail to seek
-+ */
-
- #define AVFMT_SEEK_TO_PTS 0x4000000 /**< Seeking is based on PTS */
-
-@@ -664,7 +667,8 @@
- /**
- * Can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_SHOW_IDS,
- * AVFMT_GENERIC_INDEX, AVFMT_TS_DISCONT, AVFMT_NOBINSEARCH,
-- * AVFMT_NOGENSEARCH, AVFMT_NO_BYTE_SEEK, AVFMT_SEEK_TO_PTS.
-+ * AVFMT_NOGENSEARCH, AVFMT_NO_BYTE_SEEK, AVFMT_SEEK_TO_PTS,
-+ * AVFMT_SEEK_NOSTREAMS
- */
- int flags;
-
-diff -ur a/libavformat/dv.c b/libavformat/dv.c
---- a/libavformat/dv.c 2017-06-06 20:03:55.000000000 -0600
-+++ b/libavformat/dv.c 2017-07-20 09:12:00.277148325 -0600
-@@ -632,6 +632,7 @@
- AVInputFormat ff_dv_demuxer = {
- .name = "dv",
- .long_name = NULL_IF_CONFIG_SMALL("DV (Digital Video)"),
-+ .flags = AVFMT_SEEK_NOSTREAMS,
- .priv_data_size = sizeof(RawDVContext),
- .read_probe = dv_probe,
- .read_header = dv_read_header,
-diff -ur a/libavformat/matroskadec.c b/libavformat/matroskadec.c
---- a/libavformat/matroskadec.c 2017-06-06 20:03:55.000000000 -0600
-+++ b/libavformat/matroskadec.c 2017-07-20 12:29:39.804273095 -0600
-@@ -3936,6 +3936,7 @@
- AVInputFormat ff_matroska_demuxer = {
- .name = "matroska,webm",
- .long_name = NULL_IF_CONFIG_SMALL("Matroska / WebM"),
-+ .flags = AVFMT_SEEK_NOSTREAMS,
- .extensions = "mkv,mk3d,mka,mks",
- .priv_data_size = sizeof(MatroskaDemuxContext),
- .read_probe = matroska_probe,
-@@ -3949,6 +3950,7 @@
- AVInputFormat ff_webm_dash_manifest_demuxer = {
- .name = "webm_dash_manifest",
- .long_name = NULL_IF_CONFIG_SMALL("WebM DASH Manifest"),
-+ .flags = AVFMT_SEEK_NOSTREAMS,
- .priv_data_size = sizeof(MatroskaDemuxContext),
- .read_header = webm_dash_manifest_read_header,
- .read_packet = webm_dash_manifest_read_packet,
-diff -ur a/libavformat/utils.c b/libavformat/utils.c
---- a/libavformat/utils.c 2017-06-06 20:04:02.000000000 -0600
-+++ b/libavformat/utils.c 2017-07-20 09:53:28.684729516 -0600
-@@ -2412,6 +2412,13 @@
- return seek_frame_byte(s, stream_index, timestamp, flags);
- }
-
-+ if (stream_index != -1 && (s->iformat->flags & AVFMT_SEEK_NOSTREAMS)) {
-+ timestamp = av_rescale_q(timestamp,
-+ s->streams[stream_index]->time_base,
-+ AV_TIME_BASE_Q);
-+ stream_index = -1;
-+ }
-+
- if (stream_index < 0) {
- stream_index = av_find_default_stream_index(s);
- if (stream_index < 0)