diff --git a/cinelerra-5.1/cinelerra/ffmpeg.C b/cinelerra-5.1/cinelerra/ffmpeg.C
index 97b6698a..5165d25d 100644
--- a/cinelerra-5.1/cinelerra/ffmpeg.C
+++ b/cinelerra-5.1/cinelerra/ffmpeg.C
@@ -1213,6 +1213,40 @@ int FFVideoStream::decode_frame(AVFrame *frame)
 	return 1;
 }
 
+int FFVideoStream::probe(int64_t pos)
+{
+	int ret = video_seek(pos);
+	if( ret < 0 ) return -1;
+	if( !frame && !(frame=av_frame_alloc()) ) {
+		fprintf(stderr, "FFVideoStream::probe: av_frame_alloc failed\n");
+		return -1;
+	}
+		
+	if (ffmpeg->interlace_from_codec)
+		return 1;
+
+		ret = read_frame(frame);
+		if( ret > 0 ) {
+			//printf("codec interlace: %i \n",frame->interlaced_frame);
+			//printf("codec tff: %i \n",frame->top_field_first);
+
+			if (!frame->interlaced_frame)
+				ffmpeg->interlace_from_codec = AV_FIELD_PROGRESSIVE;
+			if ((frame->interlaced_frame) && (frame->top_field_first))
+				ffmpeg->interlace_from_codec = AV_FIELD_TT;
+			if ((frame->interlaced_frame) && (!frame->top_field_first))
+				ffmpeg->interlace_from_codec = AV_FIELD_BB;
+			//printf("Interlace mode from codec: %i\n", ffmpeg->interlace_from_codec);
+
+	}
+
+	if( frame->format == AV_PIX_FMT_NONE || frame->width <= 0 || frame->height <= 0 )
+		ret = -1;
+
+	ret = ret > 0 ? 1 : ret < 0 ? -1 : 0;
+	return ret;
+}
+
 int FFVideoStream::load(VFrame *vframe, int64_t pos)
 {
 	int ret = video_seek(pos);
@@ -1221,6 +1255,8 @@ int FFVideoStream::load(VFrame *vframe, int64_t pos)
 		fprintf(stderr, "FFVideoStream::load: av_frame_alloc failed\n");
 		return -1;
 	}
+	
+
 	int i = MAX_RETRY + pos - curr_pos;
 	int64_t cache_start = 0;
 	while( ret>=0 && !flushed && curr_pos<=pos && --i>=0 ) {
@@ -1391,6 +1427,7 @@ int FFVideoStream::encode(VFrame *vframe)
 
 int FFVideoStream::drain()
 {
+
 	return 0;
 }
 
@@ -1776,6 +1813,7 @@ FFMPEG::FFMPEG(FileBase *file_base)
 	flow = 1;
 	decoding = encoding = 0;
 	has_audio = has_video = 0;
+	interlace_from_codec = 0;
 	opts = 0;
 	opt_duration = -1;
 	opt_video_filter = 0;
@@ -2411,6 +2449,10 @@ int FFMPEG::info(char *text, int len)
 		AVPixelFormat pix_fmt = (AVPixelFormat)st->codecpar->format;
 		const char *pfn = av_get_pix_fmt_name(pix_fmt);
 		report(" pix %s\n", pfn ? pfn : unkn);
+		int interlace = st->codecpar->field_order;
+		report("  interlace (container level): %i\n", interlace ? interlace : -1);
+		int interlace_codec = interlace_from_codec;
+		report("  interlace (codec level): %i\n", interlace_codec ? interlace_codec : -1);
 		enum AVColorSpace space = st->codecpar->color_space;
 		const char *nm = av_color_space_name(space);
 		report("    color space:%s", nm ? nm : unkn);
@@ -3181,6 +3223,33 @@ int FFMPEG::audio_seek(int stream, int64_t pos)
 	return 0;
 }
 
+int FFMPEG::video_probe(int64_t pos)
+{
+	int vidx = vstrm_index[0].st_idx;
+	FFVideoStream *vid = ffvideo[vidx];
+	vid->probe(pos);
+	
+	int interlace1 = interlace_from_codec;
+	//printf("interlace from codec: %i\n", interlace1);
+
+	switch (interlace1)
+	{
+	case AV_FIELD_TT:
+	case AV_FIELD_TB:
+	    return ILACE_MODE_TOP_FIRST;
+	case AV_FIELD_BB:
+	case AV_FIELD_BT:
+	    return ILACE_MODE_BOTTOM_FIRST;
+	case AV_FIELD_PROGRESSIVE:
+	    return ILACE_MODE_NOTINTERLACED;
+	default:
+	    return ILACE_MODE_UNDETECTED;
+	}
+
+}
+
+
+
 int FFMPEG::video_seek(int stream, int64_t pos)
 {
 	int vidx = vstrm_index[stream].st_idx;
@@ -3468,7 +3537,22 @@ int FFMPEG::ff_coded_height(int stream)
 
 float FFMPEG::ff_aspect_ratio(int stream)
 {
-	return ffvideo[stream]->aspect_ratio;
+	//return ffvideo[stream]->aspect_ratio;
+	AVFormatContext *fmt_ctx = ffvideo[stream]->fmt_ctx;
+	AVStream *strm = ffvideo[stream]->st;
+	AVCodecParameters *par = ffvideo[stream]->st->codecpar;
+	AVRational dar;
+	AVRational sar = av_guess_sample_aspect_ratio(fmt_ctx, strm, NULL);
+        if (sar.num) {
+            printf("sample_aspect_ratio, %f \n", av_q2d(sar));
+            av_reduce(&dar.num, &dar.den,
+                      par->width  * sar.num,
+                      par->height * sar.den,
+                      1024*1024);
+                      printf("display_aspect_ratio, %f \n", av_q2d(dar));
+                      return av_q2d(dar);
+                      }
+        return ffvideo[stream]->aspect_ratio;
 }
 
 const char* FFMPEG::ff_video_codec(int stream)
@@ -3509,6 +3593,31 @@ int FFMPEG::ff_video_mpeg_color_range(int stream)
 	return ffvideo[stream]->st->codecpar->color_range == AVCOL_RANGE_MPEG ? 1 : 0;
 }
 
+int FFMPEG::ff_interlace(int stream)
+{
+// https://ffmpeg.org/doxygen/trunk/structAVCodecParserContext.html
+/* reads from demuxer because codec frame not ready */
+	int interlace = ffvideo[stream]->st->codecpar->field_order;
+	printf("interlace from demux: %i\n", interlace);
+
+	switch (interlace)
+	{
+	case AV_FIELD_TT:
+	case AV_FIELD_TB:
+	    return ILACE_MODE_TOP_FIRST;
+	case AV_FIELD_BB:
+	case AV_FIELD_BT:
+	    return ILACE_MODE_BOTTOM_FIRST;
+	case AV_FIELD_PROGRESSIVE:
+	    return ILACE_MODE_NOTINTERLACED;
+	default:
+	    return ILACE_MODE_UNDETECTED;
+	}
+	
+}
+
+
+
 int FFMPEG::ff_cpus()
 {
 	return !file_base ? 1 : file_base->file->cpus;
diff --git a/cinelerra-5.1/cinelerra/ffmpeg.h b/cinelerra-5.1/cinelerra/ffmpeg.h
index 2e1f201f..4f1624ce 100644
--- a/cinelerra-5.1/cinelerra/ffmpeg.h
+++ b/cinelerra-5.1/cinelerra/ffmpeg.h
@@ -256,6 +256,7 @@ public:
 
 	int init_frame(AVFrame *picture);
 	int load(VFrame *vframe, int64_t pos);
+	int probe(int64_t pos);
 	int video_seek(int64_t pos);
 	int encode(VFrame *vframe);
 	int drain();
@@ -383,6 +384,7 @@ public:
 	double get_initial_timecode(int data_type, int channel, double frame_rate);
 
 	int audio_seek(int ch, int64_t pos);
+	int video_probe(int64_t pos);
 	int video_seek(int layer, int64_t pos);
 
 	int decode(int chn, int64_t pos, double *samples, int len);
@@ -434,6 +436,7 @@ public:
 
 	int decoding, encoding;
 	int has_audio, has_video;
+	int interlace_from_codec;
 
 	FFMPEG(FileBase *file_base=0);
 	~FFMPEG();
@@ -463,6 +466,7 @@ public:
 	float ff_aspect_ratio(int stream);
 	int ff_color_range(int stream);
 	int ff_color_space(int stream);
+	int ff_interlace(int stream);
 	double ff_frame_rate(int stream);
 	const char *ff_video_codec(int stream);
 	int64_t ff_video_frames(int stream);
diff --git a/cinelerra-5.1/cinelerra/fileffmpeg.C b/cinelerra-5.1/cinelerra/fileffmpeg.C
index ff206b10..75825b90 100644
--- a/cinelerra-5.1/cinelerra/fileffmpeg.C
+++ b/cinelerra-5.1/cinelerra/fileffmpeg.C
@@ -326,7 +326,7 @@ int FileFFMPEG::open_file(int rd, int wr)
 	int result = 0;
 	if( ff ) return 1;
 	ff = new FFMPEG(this);
-
+	
 	if( rd ) {
 		result = ff->init_decoder(asset->path);
 		if( !result ) result = ff->open_decoder();
@@ -342,6 +342,11 @@ int FileFFMPEG::open_file(int rd, int wr)
 			int video_layers = ff->ff_total_video_layers();
 			if( video_layers > 0 ) {
 				asset->video_data = 1;
+				asset->aspect_ratio = ff->ff_aspect_ratio(0);
+				printf("ff_aspect_ratio, %f \n", asset->aspect_ratio);
+				if (!asset->interlace_mode) asset->interlace_mode = ff->ff_interlace(0);
+				ff->video_probe(1);
+				 if (!asset->interlace_mode && (ff->interlace_from_codec) ) asset->interlace_mode = ff->video_probe(1); 
 				if( !asset->layers ) asset->layers = video_layers;
 				asset->actual_width = ff->ff_video_width(0);
 				asset->actual_height = ff->ff_video_height(0);
diff --git a/cinelerra-5.1/cinelerra/mwindow.C b/cinelerra-5.1/cinelerra/mwindow.C
index f245018a..089983cb 100644
--- a/cinelerra-5.1/cinelerra/mwindow.C
+++ b/cinelerra-5.1/cinelerra/mwindow.C
@@ -4493,11 +4493,14 @@ static inline int gcd(int m, int n)
 int MWindow::create_aspect_ratio(float &w, float &h, int width, int height)
 {
 	w = 1;  h = 1;
+	double ar;
+	
 	if(!width || !height) return 1;
 	if( width == 720 && (height == 480 || height == 576) ) {
 		w = 4;  h = 3;  return 0; // for NTSC and PAL
 	}
-	double ar = (double)width / height;
+	
+	ar = (double)width / height;
 // square-ish pixels
 	if( EQUIV(ar, 1.0000) ) return 0;
 	if( EQUIV(ar, 1.3333) ) { w = 4;  h = 3;  return 0; }
@@ -4505,6 +4508,8 @@ int MWindow::create_aspect_ratio(float &w, float &h, int width, int height)
 	if( EQUIV(ar, 2.1111) ) { w = 19; h = 9;  return 0; }
 	if( EQUIV(ar, 2.2222) ) { w = 20; h = 9;  return 0; }
 	if( EQUIV(ar, 2.3333) ) { w = 21; h = 9;  return 0; }
+	if( EQUIV(ar, 2.37037) ) { w = 21; h = 9;  return 0; }
+
 	int ww = width, hh = height;
 	// numerator, denominator must be under mx
 	int mx = 255, n = gcd(ww, hh);
@@ -5048,12 +5053,26 @@ int MWindow::select_asset(Asset *asset, int vstream, int astream, int delete_tra
 		session->output_w = width;
 		session->output_h = height;
 		session->frame_rate = framerate;
+		session->interlace_mode = asset->interlace_mode;
 		// not, asset->actual_width/actual_height
 		asset->width = session->output_w;
 		asset->height = session->output_h;
 		asset->frame_rate = session->frame_rate;
+		
 		create_aspect_ratio(session->aspect_w, session->aspect_h,
 			session->output_w, session->output_h);
+	float ar = asset->aspect_ratio;
+	if (ar) {
+	//printf ("Aspect ratio from asset: %f \n", ar);
+	if( EQUIV(ar, 1.3333) ) { session->aspect_w = 4;  session->aspect_h = 3;  }
+	if( EQUIV(ar, 1.7777) ) { session->aspect_w = 16; session->aspect_h = 9;   }
+	if( EQUIV(ar, 2.1111) ) { session->aspect_w = 19; session->aspect_h = 9;  }
+	if( EQUIV(ar, 2.2222) ) { session->aspect_w = 20; session->aspect_h = 9;   }
+	if( EQUIV(ar, 2.3333) ) { session->aspect_w = 21; session->aspect_h = 9;   }
+	if( EQUIV(ar, 2.370370) ) { session->aspect_w = 21; session->aspect_h = 9; }
+	}
+			
+			
 		Track *track = edl->tracks->first;
 		for( Track *next_track=0; track; track=next_track ) {
 			next_track = track->next;