Hello everybody...I'm an italian student...I'm tryng to convert a raw .264 file to MP4...I was adviced to use MP4Box but this is its output...

AVC-H264 import - frame size 176 x 144 at 25.000 FPS
WARNING: NAL Unit type 14 not handled - adding
WARNING: NAL Unit type 14 not handled - adding
Importing AVC-H264: | | (02/100)
WARNING: NAL Unit type 14 not handled - adding
Importing AVC-H264: |= | (06/100)
WARNING: NAL Unit type 14 not handled - adding
Importing AVC-H264: |= | (07/100)
WARNING: NAL Unit type 14 not handled - adding
Importing AVC-H264: |== | (10/100)
WARNING: NAL Unit type 14 not handled - adding
Importing AVC-H264: |== | (12/100)
WARNING: NAL Unit type 14 not handled - adding
Importing AVC-H264: |=== | (15/100)
WARNING: NAL Unit type 14 not handled - adding
Importing AVC-H264: |=== | (17/100)
WARNING: NAL Unit type 14 not handled - adding
Importing AVC-H264: |=== | (19/100)
WARNING: NAL Unit type 14 not handled - adding
Importing AVC-H264: |==== | (23/100)
WARNING: NAL Unit type 14 not handled - adding
Importing AVC-H264: |===== | (25/100)
WARNING: NAL Unit type 14 not handled - adding
Importing AVC-H264: |===== | (28/100)
WARNING: NAL Unit type 14 not handled - adding
Importing AVC-H264: |====== | (30/100)
WARNING: NAL Unit type 14 not handled - adding
Importing AVC-H264: |====== | (32/100)
WARNING: NAL Unit type 14 not handled - adding
Importing AVC-H264: |======= | (35/100)
WARNING: NAL Unit type 14 not handled - adding
Importing AVC-H264: |======= | (37/100)
WARNING: NAL Unit type 14 not handled - adding
Importing AVC-H264: |======= | (39/100)
WARNING: NAL Unit type 14 not handled - adding
Importing AVC-H264: |======== | (42/100)
WARNING: NAL Unit type 14 not handled - adding
Importing AVC-H264: |======== | (44/100)
WARNING: NAL Unit type 14 not handled - adding
Importing AVC-H264: |========= | (47/100)
WARNING: NAL Unit type 14 not handled - adding
Importing AVC-H264: |========= | (49/100)
WARNING: NAL Unit type 14 not handled - adding
Importing AVC-H264: |========== | (51/100)
WARNING: NAL Unit type 14 not handled - adding
Importing AVC-H264: |========== | (54/100)
WARNING: NAL Unit type 14 not handled - adding
Importing AVC-H264: |=========== | (56/100)
WARNING: NAL Unit type 14 not handled - adding
Importing AVC-H264: |=========== | (59/100)
WARNING: NAL Unit type 14 not handled - adding
Importing AVC-H264: |============ | (61/100)
WARNING: NAL Unit type 14 not handled - adding
Importing AVC-H264: |============ | (63/100)
WARNING: NAL Unit type 14 not handled - adding
Importing AVC-H264: |============= | (66/100)
WARNING: NAL Unit type 14 not handled - adding
Importing AVC-H264: |============= | (68/100)
WARNING: NAL Unit type 14 not handled - adding
Importing AVC-H264: |============== | (70/100)
WARNING: NAL Unit type 14 not handled - adding
Importing AVC-H264: |============== | (72/100)
WARNING: NAL Unit type 14 not handled - adding
Importing AVC-H264: |=============== | (75/100)
WARNING: NAL Unit type 14 not handled - adding
Importing AVC-H264: |=============== | (77/100)
WARNING: NAL Unit type 14 not handled - adding
Importing AVC-H264: |================ | (80/100)
WARNING: NAL Unit type 14 not handled - adding
Importing AVC-H264: |================ | (81/100)
WARNING: NAL Unit type 14 not handled - adding
Importing AVC-H264: |================ | (84/100)
WARNING: NAL Unit type 14 not handled - adding
Importing AVC-H264: |================= | (86/100)
WARNING: NAL Unit type 14 not handled - adding
Importing AVC-H264: |================= | (87/100)
WARNING: NAL Unit type 14 not handled - adding
Importing AVC-H264: |================= | (89/100)
WARNING: NAL Unit type 14 not handled - adding
Importing AVC-H264: |================== | (91/100)
WARNING: NAL Unit type 14 not handled - adding
Importing AVC-H264: |================== | (93/100)
WARNING: NAL Unit type 14 not handled - adding
WARNING: NAL Unit type 14 not handled - adding
Importing AVC-H264: |================== | (94/100)
WARNING: NAL Unit type 14 not handled - adding
Importing AVC-H264: |=================== | (95/100)
WARNING: NAL Unit type 14 not handled - adding
WARNING: NAL Unit type 14 not handled - adding
WARNING: NAL Unit type 14 not handled - adding
Importing AVC-H264: |=================== | (96/100)
WARNING: NAL Unit type 14 not handled - adding
Importing AVC-H264: |=================== | (97/100)
WARNING: NAL Unit type 14 not handled - adding
Importing AVC-H264: |=================== | (98/100)
WARNING: NAL Unit type 14 not handled - adding
Importing AVC-H264: |=================== | (99/100)
Importing AVC-H264: |=================== | (98/100)

Import results: 50 samples - Slices: 14 I 36 P 0 B - 1 SEI - 2 IDR
Saving to prova.mp4: 0.500 secs Interleaving
ISO File Writing: | | (02/100)
ISO File Writing: | | (04/100)
ISO File Writing: |= | (06/100)
ISO File Writing: |= | (08/100)
ISO File Writing: |== | (10/100)
ISO File Writing: |== | (12/100)
ISO File Writing: |== | (14/100)
ISO File Writing: |=== | (16/100)
ISO File Writing: |=== | (18/100)
ISO File Writing: |==== | (20/100)
ISO File Writing: |==== | (22/100)
ISO File Writing: |==== | (24/100)
ISO File Writing: |===== | (26/100)
ISO File Writing: |===== | (28/100)
ISO File Writing: |====== | (30/100)
ISO File Writing: |====== | (32/100)
ISO File Writing: |====== | (34/100)
ISO File Writing: |======= | (36/100)
ISO File Writing: |======= | (38/100)
ISO File Writing: |======== | (40/100)
ISO File Writing: |======== | (42/100)
ISO File Writing: |======== | (44/100)
ISO File Writing: |========= | (46/100)
ISO File Writing: |========= | (48/100)
ISO File Writing: |========== | (50/100)
ISO File Writing: |========== | (52/100)
ISO File Writing: |========== | (54/100)
ISO File Writing: |=========== | (56/100)
ISO File Writing: |=========== | (57/100)
ISO File Writing: |============ | (60/100)
ISO File Writing: |============ | (62/100)
ISO File Writing: |============ | (64/100)
ISO File Writing: |============= | (66/100)
ISO File Writing: |============= | (68/100)
ISO File Writing: |============== | (70/100)
ISO File Writing: |============== | (72/100)
ISO File Writing: |============== | (74/100)
ISO File Writing: |=============== | (76/100)
ISO File Writing: |=============== | (78/100)
ISO File Writing: |================ | (80/100)
ISO File Writing: |================ | (82/100)
ISO File Writing: |================ | (84/100)
ISO File Writing: |================= | (86/100)
ISO File Writing: |================= | (88/100)
ISO File Writing: |================== | (90/100)
ISO File Writing: |================== | (92/100)
ISO File Writing: |================== | (94/100)
ISO File Writing: |=================== | (96/100)
ISO File Writing: |=================== | (98/100)

Have you got any advice? How can I convert my .264 file?This is actually coded as H.264 SVC...
Please help me!!!