==Sequencer & ffmpeg==

Bugfixes:
- hddaudio now allocates it's decode buffer + AVCODEC_MAX_AUDIO_FRAME_SIZE
  safety interval. (The former code expected all decoded audio frames to
  be the same size which can hurt under some circumstances e.g. VBR files)
- writeffmpeg: some pointers where not initialized on start and after
  deletion not set to null. Could segfault randomly on error conditions.
- drawseq: use startdisp and enddisp to decide, if a strip should be drawn.
  (Just extend strips first or last frame beyond screen dimensions in
  the previous version and watch the strip disappear)

source/blender/blenkernel/intern/writeffmpeg.c

@@ -66,10 +66,10 @@ static int ffmpeg_multiplex_audio = 1;
 static int ffmpeg_autosplit = 0;
 static int ffmpeg_autosplit_count = 0;
 
-static AVFormatContext* outfile;
-static AVStream* video_stream;
-static AVStream* audio_stream;
-static AVFrame* current_frame;
+static AVFormatContext* outfile = 0;
+static AVStream* video_stream = 0;
+static AVStream* audio_stream = 0;
+static AVFrame* current_frame = 0;
 
 static uint8_t* video_buffer = 0;
 static int video_buffersize = 0;
@@ -663,6 +663,7 @@ void end_ffmpeg(void)
 	/* free the temp buffer */
 	if (current_frame) {
 		delete_picture(current_frame);
+		current_frame = 0;
 	}
 	if (outfile && outfile->oformat) {
 		if (!(outfile->oformat->flags & AVFMT_NOFILE)) {

source/blender/src/drawseq.c

@@ -1026,8 +1026,8 @@ void drawseqspace(ScrArea *sa, void *spacedata)
 		seq= ed->seqbasep->first;
 		while(seq) { /* bound box test, dont draw outside the view */
 			if (seq->flag & SELECT ||
-					seq->start > v2d->cur.xmax ||
-					seq->start+seq->len < v2d->cur.xmin ||
+					seq->startdisp > v2d->cur.xmax ||
+					seq->enddisp < v2d->cur.xmin ||
 					seq->machine+1.0 < v2d->cur.ymin ||
 					seq->machine > v2d->cur.ymax)
 			{
@@ -1043,8 +1043,8 @@ void drawseqspace(ScrArea *sa, void *spacedata)
 		seq= ed->seqbasep->first;
 		while(seq) { /* bound box test, dont draw outside the view */
 			if (!(seq->flag & SELECT) ||
-					seq->start > v2d->cur.xmax ||
-					seq->start+seq->len < v2d->cur.xmin ||
+					seq->startdisp > v2d->cur.xmax ||
+					seq->enddisp < v2d->cur.xmin ||
 					seq->machine+1.0 < v2d->cur.ymin ||
 					seq->machine > v2d->cur.ymax)
 			{

source/blender/src/hddaudio.c

@@ -170,7 +170,8 @@ struct hdaudio * sound_open_hdaudio(char * filename)
 		* 2;
 
 	rval->decode_cache = (short*) MEM_mallocN(
-		rval->decode_cache_size * sizeof(short), 
+		rval->decode_cache_size * sizeof(short)
+		+ AVCODEC_MAX_AUDIO_FRAME_SIZE, 
 		"hdaudio decode cache");
 	rval->decode_pos = 0;
 	rval->target_channels = -1;