ffmpeg roll of source to mar 9 version...

patched-ffmpeg-mt/libavformat/matroskadec.c

Index: patched-ffmpeg-mt/libavformat/matroskadec.c
===================================================================
--- patched-ffmpeg-mt/libavformat/matroskadec.c	(revision 41250)
+++ patched-ffmpeg-mt/libavformat/matroskadec.c	(working copy)
@@ -143,6 +143,7 @@
 
     AVStream *stream;
     int64_t end_timecode;
+    int ms_compat;
 } MatroskaTrack;
 
 typedef struct {
@@ -1244,6 +1245,7 @@
         if (!strcmp(track->codec_id, "V_MS/VFW/FOURCC")
             && track->codec_priv.size >= 40
             && track->codec_priv.data != NULL) {
+            track->ms_compat = 1;
             track->video.fourcc = AV_RL32(track->codec_priv.data + 16);
             codec_id = ff_codec_get_id(ff_codec_bmp_tags, track->video.fourcc);
             extradata_offset = 40;
@@ -1674,6 +1676,11 @@
                 int offset = 0, pkt_size = lace_size[n];
                 uint8_t *pkt_data = data;
 
+                if (lace_size[n] > size) {
+                    av_log(matroska->ctx, AV_LOG_ERROR, "Invalid packet size\n");
+                    break;
+                }
+
                 if (encodings && encodings->scope & 1) {
                     offset = matroska_decode_buffer(&pkt_data,&pkt_size, track);
                     if (offset < 0)
@@ -1698,7 +1705,10 @@
                     pkt->flags = is_keyframe;
                 pkt->stream_index = st->index;
 
-                pkt->pts = timecode;
+                if (track->ms_compat)
+                    pkt->dts = timecode;
+                else
+                    pkt->pts = timecode;
                 pkt->pos = pos;
                 if (st->codec->codec_id == CODEC_ID_TEXT)
                     pkt->convergence_duration = duration;
@@ -1722,6 +1732,7 @@
             if (timecode != AV_NOPTS_VALUE)
                 timecode = duration ? timecode + duration : AV_NOPTS_VALUE;
             data += lace_size[n];
+            size -= lace_size[n];
         }
     }