diff --git a/libavformat/movenc.c b/libavformat/movenc.c
index 06d18f91f8..172353fadc 100644
--- a/libavformat/movenc.c
+++ b/libavformat/movenc.c
@@ -1949,7 +1949,7 @@ static void build_chunks(MOVTrack *trk)
     trk->chunkCount= 1;
     for(i=1; i<trk->entry; i++){
         if(chunk->pos + chunkSize == trk->cluster[i].pos &&
-            chunkSize + trk->cluster[i].size < UINT32_MAX / 4){
+            chunkSize + trk->cluster[i].size < (1<<20)){
             chunkSize             += trk->cluster[i].size;
             chunk->samplesInChunk += trk->cluster[i].entries;
         }else{
diff --git a/tests/asynth1.sw b/tests/asynth1.sw
new file mode 100644
index 0000000000..adda4d5757
Binary files /dev/null and b/tests/asynth1.sw differ
diff --git a/tests/ref/acodec/pcm_s16be b/tests/ref/acodec/pcm_s16be
index c5b2a9f840..967876fc73 100644
--- a/tests/ref/acodec/pcm_s16be
+++ b/tests/ref/acodec/pcm_s16be
@@ -1,4 +1,4 @@
-96079f7b65fdbe991e69bb96a3188217 *./tests/data/acodec/pcm_s16be.mov
-1059029 ./tests/data/acodec/pcm_s16be.mov
+a874f5c08b8d104a6bbf41b21454180d *./tests/data/acodec/pcm_s16be.mov
+1059045 ./tests/data/acodec/pcm_s16be.mov
 64151e4bcc2b717aa5a8454d424d6a1f *./tests/data/pcm_s16be.acodec.out.wav
 stddev:    0.00 PSNR:999.99 MAXDIFF:    0 bytes:  1058400/  1058400
diff --git a/tests/ref/acodec/pcm_s24be b/tests/ref/acodec/pcm_s24be
index 6ebbed2555..26f0cc73d8 100644
--- a/tests/ref/acodec/pcm_s24be
+++ b/tests/ref/acodec/pcm_s24be
@@ -1,4 +1,4 @@
-74465b486afddaf802300cdbf3b59a11 *./tests/data/acodec/pcm_s24be.mov
-1588229 ./tests/data/acodec/pcm_s24be.mov
+833d4afd907139af7106a5642a9c23d3 *./tests/data/acodec/pcm_s24be.mov
+1588245 ./tests/data/acodec/pcm_s24be.mov
 64151e4bcc2b717aa5a8454d424d6a1f *./tests/data/pcm_s24be.acodec.out.wav
 stddev:    0.00 PSNR:999.99 MAXDIFF:    0 bytes:  1058400/  1058400
diff --git a/tests/ref/acodec/pcm_s32be b/tests/ref/acodec/pcm_s32be
index f6df3adc88..1e495a68d9 100644
--- a/tests/ref/acodec/pcm_s32be
+++ b/tests/ref/acodec/pcm_s32be
@@ -1,4 +1,4 @@
-ac3822c11273a25005dfd6aa64b255df *./tests/data/acodec/pcm_s32be.mov
-2117429 ./tests/data/acodec/pcm_s32be.mov
+c02c96e37b321f2c978968e3a102c669 *./tests/data/acodec/pcm_s32be.mov
+2117449 ./tests/data/acodec/pcm_s32be.mov
 64151e4bcc2b717aa5a8454d424d6a1f *./tests/data/pcm_s32be.acodec.out.wav
 stddev:    0.00 PSNR:999.99 MAXDIFF:    0 bytes:  1058400/  1058400
diff --git a/tests/ref/vsynth1/dnxhd_1080i b/tests/ref/vsynth1/dnxhd_1080i
index 841a0c02cc..f8f6df09bf 100644
--- a/tests/ref/vsynth1/dnxhd_1080i
+++ b/tests/ref/vsynth1/dnxhd_1080i
@@ -1,4 +1,4 @@
-153afc6bd83611db4ba0d6d509fc3d74 *./tests/data/vsynth1/dnxhd-1080i.mov
-3031895 ./tests/data/vsynth1/dnxhd-1080i.mov
+027c985483caab9397592bf27477dce1 *./tests/data/vsynth1/dnxhd-1080i.mov
+3031911 ./tests/data/vsynth1/dnxhd-1080i.mov
 0c651e840f860592f0d5b66030d9fa32 *./tests/data/dnxhd_1080i.vsynth1.out.yuv
 stddev:    6.29 PSNR: 32.15 MAXDIFF:   64 bytes:   760320/  7603200
diff --git a/tests/ref/vsynth1/prores b/tests/ref/vsynth1/prores
index e0909347a7..dc25a69ed5 100644
--- a/tests/ref/vsynth1/prores
+++ b/tests/ref/vsynth1/prores
@@ -1,4 +1,4 @@
-e8487134a5e4b8351de7ad386fb25e27 *./tests/data/vsynth1/prores.mov
-5022795 ./tests/data/vsynth1/prores.mov
+31159cc9d1693bc66ad7a3083c48bcc4 *./tests/data/vsynth1/prores.mov
+5022811 ./tests/data/vsynth1/prores.mov
 a2e2d1d45341a94ff994d1d92629f778 *./tests/data/prores.vsynth1.out.yuv
 stddev:    2.47 PSNR: 40.27 MAXDIFF:   31 bytes:  7603200/  7603200
diff --git a/tests/ref/vsynth1/qtrle b/tests/ref/vsynth1/qtrle
index a684f172bb..81cf6db3c2 100644
--- a/tests/ref/vsynth1/qtrle
+++ b/tests/ref/vsynth1/qtrle
@@ -1,4 +1,4 @@
-54a37ac94abdd95b9e5726a2211e8e1c *./tests/data/vsynth1/qtrle.mov
-15263072 ./tests/data/vsynth1/qtrle.mov
+9c6ee876369fceac1ff2478a0225bc9b *./tests/data/vsynth1/qtrle.mov
+15263148 ./tests/data/vsynth1/qtrle.mov
 93695a27c24a61105076ca7b1f010bbd *./tests/data/qtrle.vsynth1.out.yuv
 stddev:    3.42 PSNR: 37.44 MAXDIFF:   48 bytes:  7603200/  7603200
diff --git a/tests/ref/vsynth1/qtrlegray b/tests/ref/vsynth1/qtrlegray
index cd3d18e6c6..ff0a81c546 100644
--- a/tests/ref/vsynth1/qtrlegray
+++ b/tests/ref/vsynth1/qtrlegray
@@ -1,4 +1,4 @@
-7b04fbf0fa29600517d048882583128b *./tests/data/vsynth1/qtrlegray.mov
-5113268 ./tests/data/vsynth1/qtrlegray.mov
+dfb185e38b3557eca0ead72d57ca48f8 *./tests/data/vsynth1/qtrlegray.mov
+5113284 ./tests/data/vsynth1/qtrlegray.mov
 29def4aed035ed65d3a89f7d382fccbe *./tests/data/qtrlegray.vsynth1.out.yuv
 stddev:   25.95 PSNR: 19.85 MAXDIFF:  122 bytes:  7603200/  7603200
diff --git a/tests/ref/vsynth1/svq1 b/tests/ref/vsynth1/svq1
index 551f989cbc..a95bd94f73 100644
--- a/tests/ref/vsynth1/svq1
+++ b/tests/ref/vsynth1/svq1
@@ -1,4 +1,4 @@
-0658c40cfef3964c60bb9b05233727de *./tests/data/vsynth1/svq1.mov
-1334207 ./tests/data/vsynth1/svq1.mov
+4654e7af0d4aa58c3db1eb145e278038 *./tests/data/vsynth1/svq1.mov
+1334223 ./tests/data/vsynth1/svq1.mov
 9cc35c54b2c77d36bd7e308b393c1f81 *./tests/data/svq1.vsynth1.out.yuv
 stddev:    9.58 PSNR: 28.50 MAXDIFF:  210 bytes:  7603200/  7603200
diff --git a/tests/ref/vsynth2/dnxhd_1080i b/tests/ref/vsynth2/dnxhd_1080i
index 04c593f53d..81ecc5eb44 100644
--- a/tests/ref/vsynth2/dnxhd_1080i
+++ b/tests/ref/vsynth2/dnxhd_1080i
@@ -1,4 +1,4 @@
-677588203650770792b63a66231bd127 *./tests/data/vsynth2/dnxhd-1080i.mov
-3031895 ./tests/data/vsynth2/dnxhd-1080i.mov
+204e80f2e406ada90fca596ab2810b3e *./tests/data/vsynth2/dnxhd-1080i.mov
+3031911 ./tests/data/vsynth2/dnxhd-1080i.mov
 3c559af629ae0a8fb1a9a0e4b4da7733 *./tests/data/dnxhd_1080i.vsynth2.out.yuv
 stddev:    1.31 PSNR: 45.77 MAXDIFF:   23 bytes:   760320/  7603200
diff --git a/tests/ref/vsynth2/prores b/tests/ref/vsynth2/prores
index 7bbe907b3a..e686e2163c 100644
--- a/tests/ref/vsynth2/prores
+++ b/tests/ref/vsynth2/prores
@@ -1,4 +1,4 @@
-81988143e6169dbf735bd180bf5a8703 *./tests/data/vsynth2/prores.mov
-2844034 ./tests/data/vsynth2/prores.mov
+0faf42c187120c61d64a5e0cea4fc92a *./tests/data/vsynth2/prores.mov
+2844066 ./tests/data/vsynth2/prores.mov
 b5844025c0f4c7c37db702c3213db232 *./tests/data/prores.vsynth2.out.yuv
 stddev:    1.31 PSNR: 45.77 MAXDIFF:   11 bytes:  7603200/  7603200
diff --git a/tests/ref/vsynth2/qtrle b/tests/ref/vsynth2/qtrle
index 4946dd6976..70a15a8ddd 100644
--- a/tests/ref/vsynth2/qtrle
+++ b/tests/ref/vsynth2/qtrle
@@ -1,4 +1,4 @@
-04c58848958a0684eba8a816e00dba28 *./tests/data/vsynth2/qtrle.mov
-14798259 ./tests/data/vsynth2/qtrle.mov
+6ac61c011e1811ebd045535b141351de *./tests/data/vsynth2/qtrle.mov
+14798335 ./tests/data/vsynth2/qtrle.mov
 98d0e2854731472c5bf13d8638502d0a *./tests/data/qtrle.vsynth2.out.yuv
 stddev:    1.26 PSNR: 46.10 MAXDIFF:   13 bytes:  7603200/  7603200
diff --git a/tests/ref/vsynth2/qtrlegray b/tests/ref/vsynth2/qtrlegray
index 1ffdb5bee4..967aec1381 100644
--- a/tests/ref/vsynth2/qtrlegray
+++ b/tests/ref/vsynth2/qtrlegray
@@ -1,4 +1,4 @@
-b9769bd1ff7e3b0fb26dfc7555e789b4 *./tests/data/vsynth2/qtrlegray.mov
-5111257 ./tests/data/vsynth2/qtrlegray.mov
+5a66c6d2b2db71eddbc50819483aa647 *./tests/data/vsynth2/qtrlegray.mov
+5111273 ./tests/data/vsynth2/qtrlegray.mov
 f63b5ebdfdba750e547c25131b0a3fd1 *./tests/data/qtrlegray.vsynth2.out.yuv
 stddev:   19.42 PSNR: 22.36 MAXDIFF:   72 bytes:  7603200/  7603200