from avctx->extradata:
00000000  01 64 00 29 ff e1 00 19 67 64 00 29 ac 34 e5 01 .d.)....gd.).4..
00000010  e0 08 7b 01 10 00 19 74 f0 04 c4 b4 08 f1 83 19 ..{....t........
00000020  60 01 00 04 68 ee bc b0                         `...h...

from raw video track:
00000000  00 00 00 01 67 64 00 29  ac 34 e5 01 e0 08 7b 01  |....gd.).4....{.|
00000010  10 00 19 74 f0 04 c4 b4  08 f1 83 19 60 00 00 00  |...t........`...|
00000020  01 68 ee bc b0 00 00 00  01 06 05 ff ff 4f dc 45  |.h...........O.E|
00000030  e9 bd e6 d9 48 b7 96 2c  d8 20 d9 23 ee ef 78 32  |....H..,. .#..x2|
00000040  36 34 20 2d 20 63 6f 72  65 20 36 30 20 72 38 38  |64 - core 60 r88|
00000050  36 4d 20 31 30 37 35 35  33 36 20 2d 20 48 2e 32  |6M 1075536 - H.2|
00000060  36 34 2f 4d 50 45 47 2d  34 20 41 56 43 20 63 6f  |64/MPEG-4 AVC co|
00000070  64 65 63 20 2d 20 43 6f  70 79 6c 65 66 74 20 32  |dec - Copyleft 2|
00000080  30 30 33 2d 32 30 30 38  20 2d 20 68 74 74 70 3a  |003-2008 - http:|
00000090  2f 2f 77 77 77 2e 76 69  64 65 6f 6c 61 6e 2e 6f  |//www.videolan.o|
000000a0  72 67 2f 78 32 36 34 2e  68 74 6d 6c 20 2d 20 6f  |rg/x264.html - o|
000000b0  70 74 69 6f 6e 73 3a 20  63 61 62 61 63 3d 31 20  |ptions: cabac=1 |
000000c0  72 65 66 3d 34 20 64 65  62 6c 6f 63 6b 3d 31 3a  |ref=4 deblock=1:|
000000d0  2d 32 3a 2d 32 20 61 6e  61 6c 79 73 65 3d 30 78  |-2:-2 analyse=0x|
000000e0  33 3a 30 78 31 31 33 20  6d 65 3d 75 6d 68 20 73  |3:0x113 me=umh s|
000000f0  75 62 6d 65 3d 36 20 72  64 63 6d 70 3d 70 73 79  |ubme=6 rdcmp=psy|
00000100  20 62 72 64 6f 3d 31 20  6d 69 78 65 64 5f 72 65  | brdo=1 mixed_re|
00000110  66 3d 31 20 6d 65 5f 72  61 6e 67 65 3d 31 36 20  |f=1 me_range=16 |
00000120  63 68 72 6f 6d 61 5f 6d  65 3d 31 20 74 72 65 6c  |chroma_me=1 trel|
00000130  6c 69 73 3d 31 20 38 78  38 64 63 74 3d 31 20 63  |lis=1 8x8dct=1 c|
00000140  71 6d 3d 30 20 64 65 61  64 7a 6f 6e 65 3d 32 31  |qm=0 deadzone=21|
00000150  2c 31 31 20 63 68 72 6f  6d 61 5f 71 70 5f 6f 66  |,11 chroma_qp_of|
00000160  66 73 65 74 3d 30 20 74  68 72 65 61 64 73 3d 36  |fset=0 threads=6|
00000170  20 6e 72 3d 30 20 64 65  63 69 6d 61 74 65 3d 31  | nr=0 decimate=1|
00000180  20 6d 62 61 66 66 3d 30  20 62 66 72 61 6d 65 73  | mbaff=0 bframes|
00000190  3d 33 20 62 5f 70 79 72  61 6d 69 64 3d 31 20 62  |=3 b_pyramid=1 b|
000001a0  5f 61 64 61 70 74 3d 31  20 62 5f 62 69 61 73 3d  |_adapt=1 b_bias=|
000001b0  30 20 64 69 72 65 63 74  3d 33 20 77 70 72 65 64  |0 direct=3 wpred|
000001c0  62 3d 31 20 62 69 6d 65  3d 31 20 6b 65 79 69 6e  |b=1 bime=1 keyin|
000001d0  74 3d 32 35 30 20 6b 65  79 69 6e 74 5f 6d 69 6e  |t=250 keyint_min|
000001e0  3d 32 35 20 73 63 65 6e  65 63 75 74 3d 34 30 28  |=25 scenecut=40(|
000001f0  70 72 65 29 20 72 63 3d  61 62 72 20 62 69 74 72  |pre) rc=abr bitr|
00000200  61 74 65 3d 34 32 30 30  30 20 72 61 74 65 74 6f  |ate=42000 rateto|
00000210  6c 3d 30 2e 31 20 72 63  65 71 3d 27 62 6c 75 72  |l=0.1 rceq='blur|
00000220  43 70 6c 78 5e 28 31 2d  71 43 6f 6d 70 29 27 20  |Cplx^(1-qComp)' |
00000230  71 63 6f 6d 70 3d 31 2e  30 30 20 71 70 6d 69 6e  |qcomp=1.00 qpmin|
00000240  3d 32 20 71 70 6d 61 78  3d 35 31 20 71 70 73 74  |=2 qpmax=51 qpst|
00000250  65 70 3d 34 20 69 70 5f  72 61 74 69 6f 3d 31 2e  |ep=4 ip_ratio=1.|
00000260  34 30 20 70 62 5f 72 61  74 69 6f 3d 31 2e 33 30  |40 pb_ratio=1.30|
00000270  20 61 71 3d 32 3a 31 2e  30 30 00 80 00           | aq=2:1.00...|
0000027d