diff --git a/trunk/src/utest/srs_utest_kernel.cpp b/trunk/src/utest/srs_utest_kernel.cpp
index 1a2f4c796..aa8f91cc7 100644
--- a/trunk/src/utest/srs_utest_kernel.cpp
+++ b/trunk/src/utest/srs_utest_kernel.cpp
@@ -4977,6 +4977,122 @@ VOID TEST(KernelMP4Test, CoverMP4MultipleCTTs)
     }
 }
 
+VOID TEST(KernelMP4Test, CoverMP4MultipleAVs)
+{
+	srs_error_t err;
+
+    MockSrsFileWriter f;
+
+    // Encode frames.
+    // V-A V-V
+    if (true) {
+        SrsMp4Encoder enc; SrsFormat fmt;
+        HELPER_EXPECT_SUCCESS(enc.initialize(&f));
+        HELPER_EXPECT_SUCCESS(fmt.initialize());
+
+        // Sequence header, V-A
+        if (true) {
+            uint8_t raw[] = {
+                0x17, 0x00, 0x00, 0x00, 0x00, 0x01, 0x64, 0x00, 0x20, 0xff, 0xe1, 0x00, 0x19, 0x67, 0x64, 0x00, 0x20, 0xac, 0xd9, 0x40, 0xc0, 0x29, 0xb0, 0x11, 0x00, 0x00, 0x03, 0x00, 0x01, 0x00, 0x00, 0x03, 0x00, 0x32, 0x0f, 0x18, 0x31, 0x96, 0x01, 0x00, 0x05, 0x68, 0xeb, 0xec, 0xb2, 0x2c
+            };
+            HELPER_EXPECT_SUCCESS(fmt.on_video(0, (char*)raw, sizeof(raw)));
+            HELPER_EXPECT_SUCCESS(enc.write_sample(
+                &fmt, SrsMp4HandlerTypeVIDE, fmt.video->frame_type, fmt.video->avc_packet_type, 0, 0, (uint8_t*)fmt.raw, fmt.nb_raw
+            ));
+            EXPECT_EQ(768, enc.width); EXPECT_EQ(320, enc.height);
+        }
+
+        if (true) {
+            uint8_t raw[] = {
+                0xaf, 0x00, 0x12, 0x10
+            };
+            HELPER_EXPECT_SUCCESS(fmt.on_audio(0, (char*)raw, sizeof(raw)));
+            HELPER_EXPECT_SUCCESS(enc.write_sample(
+                &fmt, SrsMp4HandlerTypeSOUN, 0x00, fmt.audio->aac_packet_type, 0, 0, (uint8_t*)fmt.raw, fmt.nb_raw
+            ));
+        }
+
+        // Frame group #0, V-A-A-V
+        if (true) {
+            uint8_t raw[] = {
+                0x17, 0x01, 0x00, 0x00, 0x50, 0x00, 0x00, 0x00, 0x7b, 0x41, 0x9a, 0x21, 0x6c, 0x42, 0x1f, 0x00, 0x00, 0xf1, 0x68, 0x1a, 0x35, 0x84, 0xb3, 0xee, 0xe0, 0x61, 0xba, 0x4e, 0xa8, 0x52, 0x48, 0x50, 0x59, 0x75, 0x42, 0xd9, 0x96, 0x4a, 0x51, 0x38, 0x2c, 0x63, 0x5e, 0x41, 0xc9, 0x70, 0x60, 0x9d, 0x13, 0x53, 0xc2, 0xa8, 0xf5, 0x45, 0x86, 0xc5, 0x3e, 0x28, 0x1a, 0x69, 0x5f, 0x71, 0x1e, 0x51, 0x74, 0x0e, 0x31, 0x47, 0x3c, 0xd3, 0xd2, 0x10, 0x25, 0x45, 0xc5, 0xb7, 0x31, 0xec, 0x7f, 0xd8, 0x02, 0xae, 0xa4, 0x77, 0x6d, 0xcb, 0xc6, 0x1e, 0x2f, 0xa2, 0xd1, 0x12, 0x08, 0x34, 0x52, 0xea, 0xe8, 0x0b, 0x4f, 0x81, 0x21, 0x4f, 0x71, 0x3f, 0xf2, 0xad, 0x02, 0x58, 0xdf, 0x9e, 0x31, 0x86, 0x9b, 0x1b, 0x41, 0xbf, 0x2a, 0x09, 0x00, 0x43, 0x5c, 0xa1, 0x7e, 0x76, 0x59, 0xef, 0xa6, 0xfc, 0x82, 0xb2, 0x72, 0x5a
+            };
+            HELPER_EXPECT_SUCCESS(fmt.on_video(0, (char*)raw, sizeof(raw)));
+            HELPER_EXPECT_SUCCESS(enc.write_sample(
+                &fmt, SrsMp4HandlerTypeVIDE, fmt.video->frame_type, fmt.video->avc_packet_type, 0, 0, (uint8_t*)fmt.raw, fmt.nb_raw
+            ));
+        }
+
+        if (true) {
+            uint8_t raw[] = {
+                0xaf, 0x01, 0x21, 0x11, 0x45, 0x00, 0x14, 0x50, 0x01, 0x46, 0xf3, 0xf1, 0x0a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5e
+            };
+            HELPER_EXPECT_SUCCESS(fmt.on_audio(0, (char*)raw, sizeof(raw)));
+            HELPER_EXPECT_SUCCESS(enc.write_sample(
+                &fmt, SrsMp4HandlerTypeSOUN, 0x00, fmt.audio->aac_packet_type, 0, 0, (uint8_t*)fmt.raw, fmt.nb_raw
+            ));
+        }
+
+        if (true) {
+            uint8_t raw[] = {
+                0xaf, 0x01, 0x21, 0x11, 0x45, 0x00, 0x14, 0x50, 0x01, 0x46, 0xf3, 0xf1, 0x0a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5e
+            };
+            HELPER_EXPECT_SUCCESS(fmt.on_audio(0, (char*)raw, sizeof(raw)));
+            HELPER_EXPECT_SUCCESS(enc.write_sample(
+                &fmt, SrsMp4HandlerTypeSOUN, 0x00, fmt.audio->aac_packet_type, 20, 20, (uint8_t*)fmt.raw, fmt.nb_raw
+            ));
+        }
+
+        if (true) {
+            uint8_t raw[] = {
+                0x27, 0x01, 0x00, 0x00, 0x50, 0x00, 0x00, 0x00, 0x7b, 0x41, 0x9a, 0x21, 0x6c, 0x42, 0x1f, 0x00, 0x00, 0xf1, 0x68, 0x1a, 0x35, 0x84, 0xb3, 0xee, 0xe0, 0x61, 0xba, 0x4e, 0xa8, 0x52, 0x48, 0x50, 0x59, 0x75, 0x42, 0xd9, 0x96, 0x4a, 0x51, 0x38, 0x2c, 0x63, 0x5e, 0x41, 0xc9, 0x70, 0x60, 0x9d, 0x13, 0x53, 0xc2, 0xa8, 0xf5, 0x45, 0x86, 0xc5, 0x3e, 0x28, 0x1a, 0x69, 0x5f, 0x71, 0x1e, 0x51, 0x74, 0x0e, 0x31, 0x47, 0x3c, 0xd3, 0xd2, 0x10, 0x25, 0x45, 0xc5, 0xb7, 0x31, 0xec, 0x7f, 0xd8, 0x02, 0xae, 0xa4, 0x77, 0x6d, 0xcb, 0xc6, 0x1e, 0x2f, 0xa2, 0xd1, 0x12, 0x08, 0x34, 0x52, 0xea, 0xe8, 0x0b, 0x4f, 0x81, 0x21, 0x4f, 0x71, 0x3f, 0xf2, 0xad, 0x02, 0x58, 0xdf, 0x9e, 0x31, 0x86, 0x9b, 0x1b, 0x41, 0xbf, 0x2a, 0x09, 0x00, 0x43, 0x5c, 0xa1, 0x7e, 0x76, 0x59, 0xef, 0xa6, 0xfc, 0x82, 0xb2, 0x72, 0x5a
+            };
+            HELPER_EXPECT_SUCCESS(fmt.on_video(0, (char*)raw, sizeof(raw)));
+            HELPER_EXPECT_SUCCESS(enc.write_sample(
+                &fmt, SrsMp4HandlerTypeVIDE, fmt.video->frame_type, fmt.video->avc_packet_type, 40, 40, (uint8_t*)fmt.raw, fmt.nb_raw
+            ));
+        }
+
+        // Flush encoder.
+        HELPER_EXPECT_SUCCESS(enc.flush());
+        //mock_print_mp4(string(f.data(), f.filesize()));
+    }
+
+    // Decode frames.
+    if (true) {
+        MockSrsFileReader fr((const char*)f.data(), f.filesize());
+        SrsMp4Decoder dec; HELPER_EXPECT_SUCCESS(dec.initialize(&fr));
+
+        SrsMp4HandlerType ht; uint16_t ft, ct; uint32_t dts, pts, nb_sample; uint8_t* sample;
+
+        // Sequence header.
+        HELPER_EXPECT_SUCCESS(dec.read_sample(&ht, &ft, &ct, &dts, &pts, &sample, &nb_sample));
+        EXPECT_EQ(0, (int)dts); EXPECT_EQ(41, nb_sample); EXPECT_EQ(SrsMp4HandlerTypeVIDE, ht); EXPECT_EQ(SrsAudioAacFrameTraitSequenceHeader, ct);
+        srs_freepa(sample);
+
+        HELPER_EXPECT_SUCCESS(dec.read_sample(&ht, &ft, &ct, &dts, &pts, &sample, &nb_sample));
+        EXPECT_EQ(0, (int)dts); EXPECT_EQ(2, nb_sample); EXPECT_EQ(SrsMp4HandlerTypeSOUN, ht); EXPECT_EQ(SrsAudioAacFrameTraitSequenceHeader, ct);
+        srs_freepa(sample);
+
+        // Frames order by dts asc.
+        HELPER_EXPECT_SUCCESS(dec.read_sample(&ht, &ft, &ct, &dts, &pts, &sample, &nb_sample));
+        EXPECT_EQ(0, (int)dts); EXPECT_EQ(127, nb_sample); EXPECT_EQ(SrsMp4HandlerTypeVIDE, ht); EXPECT_NE(SrsAudioAacFrameTraitSequenceHeader, ct);
+        srs_freepa(sample);
+
+        HELPER_EXPECT_SUCCESS(dec.read_sample(&ht, &ft, &ct, &dts, &pts, &sample, &nb_sample));
+        EXPECT_EQ(0, (int)dts); EXPECT_EQ(87, nb_sample); EXPECT_EQ(SrsMp4HandlerTypeSOUN, ht); EXPECT_NE(SrsAudioAacFrameTraitSequenceHeader, ct);
+        srs_freepa(sample);
+
+        HELPER_EXPECT_SUCCESS(dec.read_sample(&ht, &ft, &ct, &dts, &pts, &sample, &nb_sample));
+        EXPECT_EQ(20, (int)dts); EXPECT_EQ(87, nb_sample); EXPECT_EQ(SrsMp4HandlerTypeSOUN, ht); EXPECT_NE(SrsAudioAacFrameTraitSequenceHeader, ct);
+        srs_freepa(sample);
+
+        HELPER_EXPECT_SUCCESS(dec.read_sample(&ht, &ft, &ct, &dts, &pts, &sample, &nb_sample));
+        EXPECT_EQ(40, (int)dts); EXPECT_EQ(40, (int)pts); EXPECT_EQ(127, nb_sample); EXPECT_EQ(SrsMp4HandlerTypeVIDE, ht); EXPECT_NE(SrsAudioAacFrameTraitSequenceHeader, ct);
+        srs_freepa(sample);
+    }
+}
+
 uint8_t* mock_copy_bytes(char* data, int size)
 {
     uint8_t* cp = new uint8_t[size];