# ffmpeg -f lavfi -i sine -t 50ms -c:a libvorbis vorbis.ogg
$ fq -d ogg verbose /vorbis.ogg
      |00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f|0123456789abcdef|.: {} /vorbis.ogg (ogg) 0x0-0xe46.7 (3655)
      |                                               |                |  pages: [3] 0x0-0xe46.7 (3655)
      |                                               |                |    [0]: page {} (ogg_page) 0x0-0x39.7 (58)
0x0000|4f 67 67 53                                    |OggS            |      capture_pattern: "OggS" (valid) 0x0-0x3.7 (4)
0x0000|            00                                 |    .           |      stream_structure_version: 0 (valid) 0x4-0x4.7 (1)
0x0000|               02                              |     .          |      unused_flags: 0 0x5-0x5.4 (0.5)
0x0000|               02                              |     .          |      last_page: false 0x5.5-0x5.5 (0.1)
0x0000|               02                              |     .          |      first_page: true 0x5.6-0x5.6 (0.1)
0x0000|               02                              |     .          |      continued_packet: false 0x5.7-0x5.7 (0.1)
0x0000|                  00 00 00 00 00 00 00 00      |      ........  |      absolute_granule_position: 0 0x6-0xd.7 (8)
0x0000|                                          e6 34|              .4|      stream_serial_number: 3971626214 0xe-0x11.7 (4)
0x0010|ba ec                                          |..              |
0x0010|      00 00 00 00                              |  ....          |      page_sequence_no: 0 0x12-0x15.7 (4)
0x0010|                  63 a5 40 49                  |      c.@I      |      page_checksum: "4940a563" (raw bits) (valid) 0x16-0x19.7 (4)
0x0010|                              01               |          .     |      page_segments: 1 0x1a-0x1a.7 (1)
      |                                               |                |      segment_table: [1] 0x1b-0x1b.7 (1)
0x0010|                                 1e            |           .    |        [0]: segment_size 30 0x1b-0x1b.7 (1)
      |                                               |                |      segments: [1] 0x1c-0x39.7 (30)
0x0010|                                    01 76 6f 72|            .vor|        [0]: segment raw bits 0x1c-0x39.7 (30)
0x0020|62 69 73 00 00 00 00 01 44 ac 00 00 00 00 00 00|bis.....D.......|
0x0030|80 38 01 00 00 00 00 00 b8 01                  |.8........      |
      |                                               |                |    [1]: page {} (ogg_page) 0x3a-0xd18.7 (3295)
0x0030|                              4f 67 67 53      |          OggS  |      capture_pattern: "OggS" (valid) 0x3a-0x3d.7 (4)
0x0030|                                          00   |              . |      stream_structure_version: 0 (valid) 0x3e-0x3e.7 (1)
0x0030|                                             00|               .|      unused_flags: 0 0x3f-0x3f.4 (0.5)
0x0030|                                             00|               .|      last_page: false 0x3f.5-0x3f.5 (0.1)
0x0030|                                             00|               .|      first_page: false 0x3f.6-0x3f.6 (0.1)
0x0030|                                             00|               .|      continued_packet: false 0x3f.7-0x3f.7 (0.1)
0x0040|00 00 00 00 00 00 00 00                        |........        |      absolute_granule_position: 0 0x40-0x47.7 (8)
0x0040|                        e6 34 ba ec            |        .4..    |      stream_serial_number: 3971626214 0x48-0x4b.7 (4)
0x0040|                                    01 00 00 00|            ....|      page_sequence_no: 1 0x4c-0x4f.7 (4)
0x0050|20 cf 02 ee                                    | ...            |      page_checksum: "ee02cf20" (raw bits) (valid) 0x50-0x53.7 (4)
0x0050|            0e                                 |    .           |      page_segments: 14 0x54-0x54.7 (1)
      |                                               |                |      segment_table: [14] 0x55-0x62.7 (14)
0x0050|               41                              |     A          |        [0]: segment_size 65 0x55-0x55.7 (1)
0x0050|                  ff                           |      .         |        [1]: segment_size 255 0x56-0x56.7 (1)
0x0050|                     ff                        |       .        |        [2]: segment_size 255 0x57-0x57.7 (1)
0x0050|                        ff                     |        .       |        [3]: segment_size 255 0x58-0x58.7 (1)
0x0050|                           ff                  |         .      |        [4]: segment_size 255 0x59-0x59.7 (1)
0x0050|                              ff               |          .     |        [5]: segment_size 255 0x5a-0x5a.7 (1)
0x0050|                                 ff            |           .    |        [6]: segment_size 255 0x5b-0x5b.7 (1)
0x0050|                                    ff         |            .   |        [7]: segment_size 255 0x5c-0x5c.7 (1)
0x0050|                                       ff      |             .  |        [8]: segment_size 255 0x5d-0x5d.7 (1)
0x0050|                                          ff   |              . |        [9]: segment_size 255 0x5e-0x5e.7 (1)
0x0050|                                             ff|               .|        [10]: segment_size 255 0x5f-0x5f.7 (1)
0x0060|ff                                             |.               |        [11]: segment_size 255 0x60-0x60.7 (1)
0x0060|   ff                                          | .              |        [12]: segment_size 255 0x61-0x61.7 (1)
0x0060|      81                                       |  .             |        [13]: segment_size 129 0x62-0x62.7 (1)
      |                                               |                |      segments: [14] 0x63-0xd18.7 (3254)
0x0060|         03 76 6f 72 62 69 73 0d 00 00 00 4c 61|   .vorbis....La|        [0]: segment raw bits 0x63-0xa3.7 (65)
0x0070|76 66 35 38 2e 37 36 2e 31 30 30 01 00 00 00 20|vf58.76.100.... |
*     |until 0xa3.7 (65)                              |                |
0x00a0|            05 76 6f 72 62 69 73 22 42 43 56 01|    .vorbis"BCV.|        [1]: segment raw bits 0xa4-0x1a2.7 (255)
0x00b0|00 40 00 00 24 73 18 2a 46 a5 73 16 84 10 1a 42|.@..$s.*F.s....B|
*     |until 0x1a2.7 (255)                            |                |
0x01a0|         c9 91 1c c9 b1 1c 0b 08 0d 59 05 00 00|   .........Y...|        [2]: segment raw bits 0x1a3-0x2a1.7 (255)
0x01b0|01 00 08 00 00 a0 48 8a a4 48 8e e4 48 92 24 59|......H..H..H.$Y|
*     |until 0x2a1.7 (255)                            |                |
0x02a0|      e7 9c 05 ad 69 8e 9a 4b b1 39 e7 9c 48 b9|  ....i..K.9..H.|        [3]: segment raw bits 0x2a2-0x3a0.7 (255)
0x02b0|79 52 9b 4b b5 39 e7 9c 73 ce 39 e7 9c 73 ce 39|yR.K.9..s.9..s.9|
*     |until 0x3a0.7 (255)                            |                |
0x03a0|   11 1d d1 11 1d d1 11 1d d1 11 1d d1 f1 1c cf| ...............|        [4]: segment raw bits 0x3a1-0x49f.7 (255)
0x03b0|11 25 51 12 25 51 12 2d d3 32 35 d3 53 45 55 75|.%Q.%Q.-.25.SEUu|
*     |until 0x49f.7 (255)                            |                |
0x04a0|78 8a a9 78 8a a8 78 8e e8 88 92 68 99 96 a8 a9|x..x..x....h....|        [5]: segment raw bits 0x4a0-0x59e.7 (255)
*     |until 0x59e.7 (255)                            |                |
0x0590|                                             45|               E|        [6]: segment raw bits 0x59f-0x69d.7 (255)
0x05a0|ce 39 2a 1d a5 c6 39 47 a9 a3 d4 51 4a b1 a6 5a|.9*...9G...QJ..Z|
*     |until 0x69d.7 (255)                            |                |
0x0690|                                          57 d6|              W.|        [7]: segment raw bits 0x69e-0x79c.7 (255)
0x06a0|7d 4d 14 55 d5 53 4d d9 15 55 55 96 55 d9 d5 65|}M.U.SM..UU.U..e|
*     |until 0x79c.7 (255)                            |                |
0x0790|                                       57 65 d9|             We.|        [8]: segment raw bits 0x79d-0x89b.7 (255)
0x07a0|f7 55 57 f6 7d 5b f7 85 e1 f6 7d df 18 55 d7 f7|.UW.}[....}..U..|
*     |until 0x89b.7 (255)                            |                |
0x0890|                                    52 6b 95 73|            Rk.s|        [9]: segment raw bits 0x89c-0x99a.7 (255)
0x08a0|52 3a 08 29 65 0e 4a 2a 29 c5 58 4a 4a 31 73 4e|R:.)e.J*).XJJ1sN|
*     |until 0x99a.7 (255)                            |                |
0x0990|                                 9c 94 8a 31 e7|           ...1.|        [10]: segment raw bits 0x99b-0xa99.7 (255)
0x09a0|20 a4 52 31 e6 1c 84 52 32 e7 20 94 92 52 e6 1c| .R1...R2. ..R..|
*     |until 0xa99.7 (255)                            |                |
0x0a90|                              52 4a 29 a5 94 12|          RJ)...|        [11]: segment raw bits 0xa9a-0xb98.7 (255)
0x0aa0|42 08 21 84 10 42 08 21 84 10 42 08 21 84 10 42|B.!..B.!..B.!..B|
*     |until 0xb98.7 (255)                            |                |
0x0b90|                           08 25 64 8c 39 e7 1c|         .%d.9..|        [12]: segment raw bits 0xb99-0xc97.7 (255)
0x0ba0|84 10 42 28 a5 94 8c 31 e7 9c 83 10 42 09 a5 94|..B(...1....B...|
*     |until 0xc97.7 (255)                            |                |
0x0c90|                        87 07 95 00 11 31 15 00|        .....1..|        [13]: segment raw bits 0xc98-0xd18.7 (129)
0x0ca0|24 26 28 e4 02 40 85 c5 45 da c5 05 74 19 e0 82|$&(..@..E...t...|
*     |until 0xd18.7 (129)                            |                |
      |                                               |                |    [2]: page {} (ogg_page) 0xd19-0xe46.7 (302)
0x0d10|                           4f 67 67 53         |         OggS   |      capture_pattern: "OggS" (valid) 0xd19-0xd1c.7 (4)
0x0d10|                                       00      |             .  |      stream_structure_version: 0 (valid) 0xd1d-0xd1d.7 (1)
0x0d10|                                          04   |              . |      unused_flags: 0 0xd1e-0xd1e.4 (0.5)
0x0d10|                                          04   |              . |      last_page: true 0xd1e.5-0xd1e.5 (0.1)
0x0d10|                                          04   |              . |      first_page: false 0xd1e.6-0xd1e.6 (0.1)
0x0d10|                                          04   |              . |      continued_packet: false 0xd1e.7-0xd1e.7 (0.1)
0x0d10|                                             9d|               .|      absolute_granule_position: 2205 0xd1f-0xd26.7 (8)
0x0d20|08 00 00 00 00 00 00                           |.......         |
0x0d20|                     e6 34 ba ec               |       .4..     |      stream_serial_number: 3971626214 0xd27-0xd2a.7 (4)
0x0d20|                                 02 00 00 00   |           .... |      page_sequence_no: 2 0xd2b-0xd2e.7 (4)
0x0d20|                                             73|               s|      page_checksum: "c510e973" (raw bits) (valid) 0xd2f-0xd32.7 (4)
0x0d30|e9 10 c5                                       |...             |
0x0d30|         04                                    |   .            |      page_segments: 4 0xd33-0xd33.7 (1)
      |                                               |                |      segment_table: [4] 0xd34-0xd37.7 (4)
0x0d30|            1f                                 |    .           |        [0]: segment_size 31 0xd34-0xd34.7 (1)
0x0d30|               3c                              |     <          |        [1]: segment_size 60 0xd35-0xd35.7 (1)
0x0d30|                  34                           |      4         |        [2]: segment_size 52 0xd36-0xd36.7 (1)
0x0d30|                     80                        |       .        |        [3]: segment_size 128 0xd37-0xd37.7 (1)
      |                                               |                |      segments: [4] 0xd38-0xe46.7 (271)
0x0d30|                        5c dd ab 3a ab ba b0 ff|        \..:....|        [0]: segment raw bits 0xd38-0xd56.7 (31)
0x0d40|5a 02 04 10 00 c0 8c da 2d b6 37 df 7c f3 cd 30|Z.......-.7.|..0|
0x0d50|0c c3 30 0c c3 7a 00                           |..0..z.         |
0x0d50|                     9a d8 3d 07 6f d2 9e 5b 5c|       ..=.o..[\|        [1]: segment raw bits 0xd57-0xd92.7 (60)
0x0d60|05 66 22 40 2a 00 00 00 00 00 00 00 00 00 00 00|.f"@*...........|
*     |until 0xd92.7 (60)                             |                |
0x0d90|         be d8 dd e6 ae 92 f7 23 3e 6f cc 0d 80|   .......#>o...|        [2]: segment raw bits 0xd93-0xdc6.7 (52)
0x0da0|7a 00 00 00 00 01 06 00 00 00 00 00 00 e0 b9 05|z...............|
*     |until 0xdc6.7 (52)                             |                |
0x0dc0|                     3e 37 dd 37 fe ee 85 47 7c|       >7.7...G||        [3]: segment raw bits 0xdc7-0xe46.7 (128)
0x0dd0|3c 61 02 9b 31 06 f6 bb ef 9f 04 62 46 41 04 c0|<a..1......bFA..|
*     |until 0xe46.7 (end) (128)                      |                |
      |                                               |                |  streams: [1] 0x3a-NA (0)
      |                                               |                |    [0]: stream {} 0x3a-NA (0)
      |                                               |                |      serial_number: 3971626214 0x3a-NA (0)
      |                                               |                |      packets: [7] 0x3a-NA (0)
      |                                               |                |        [0]: packet {} (vorbis_packet) 0x0-0x1d.7 (30)
 0x000|01                                             |.               |          packet_type: "Identification" (1) 0x0-0x0.7 (1)
 0x000|   76 6f 72 62 69 73                           | vorbis         |          magic: "vorbis" (valid) 0x1-0x6.7 (6)
 0x000|                     00 00 00 00               |       ....     |          vorbis_version: 0 (valid) 0x7-0xa.7 (4)
 0x000|                                 01            |           .    |          audio_channels: 1 0xb-0xb.7 (1)
 0x000|                                    44 ac 00 00|            D...|          audio_sample_rate: 44100 0xc-0xf.7 (4)
 0x010|00 00 00 00                                    |....            |          bitrate_maximum: 0 0x10-0x13.7 (4)
 0x010|            80 38 01 00                        |    .8..        |          bitrate_nominal: 80000 0x14-0x17.7 (4)
 0x010|                        00 00 00 00            |        ....    |          bitrate_minimum: 0 0x18-0x1b.7 (4)
 0x010|                                    b8         |            .   |          blocksize_1: 2048 0x1c-0x1c.3 (0.4)
 0x010|                                    b8         |            .   |          blocksize_0: 256 0x1c.4-0x1c.7 (0.4)
 0x010|                                       01|     |             .| |          padding0: raw bits (all zero) 0x1d-0x1d.6 (0.7)
 0x010|                                       01|     |             .| |          framing_flag: 1 (valid) 0x1d.7-0x1d.7 (0.1)
      |                                               |                |        [1]: packet {} (vorbis_packet) 0x0-0x40.7 (65)
 0x000|03                                             |.               |          packet_type: "Comment" (3) 0x0-0x0.7 (1)
 0x000|   76 6f 72 62 69 73                           | vorbis         |          magic: "vorbis" (valid) 0x1-0x6.7 (6)
      |                                               |                |          comment: {} (vorbis_comment) 0x7-0x3f.7 (57)
 0x000|                     0d 00 00 00               |       ....     |            vendor_length: 13 0x7-0xa.7 (4)
 0x000|                                 4c 61 76 66 35|           Lavf5|            vendor: "Lavf58.76.100" 0xb-0x17.7 (13)
 0x010|38 2e 37 36 2e 31 30 30                        |8.76.100        |
 0x010|                        01 00 00 00            |        ....    |            user_comment_list_length: 1 0x18-0x1b.7 (4)
      |                                               |                |            user_comments: [1] 0x1c-0x3f.7 (36)
      |                                               |                |              [0]: user_comment {} 0x1c-0x3f.7 (36)
 0x010|                                    20 00 00 00|             ...|                length: 32 0x1c-0x1f.7 (4)
 0x020|65 6e 63 6f 64 65 72 3d 4c 61 76 63 35 38 2e 31|encoder=Lavc58.1|                comment: "encoder=Lavc58.134.100 libvorbis" 0x20-0x3f.7 (32)
 0x030|33 34 2e 31 30 30 20 6c 69 62 76 6f 72 62 69 73|34.100 libvorbis|
 0x040|01|                                            |.|              |          padding0: raw bits (all zero) 0x40-0x40.6 (0.7)
 0x040|01|                                            |.|              |          frame_bit: 1 (valid) 0x40.7-0x40.7 (0.1)
      |                                               |                |        [2]: packet {} (vorbis_packet) 0x0-0xc74.7 (3189)
 0x000|05                                             |.               |          packet_type: "Setup" (5) 0x0-0x0.7 (1)
 0x000|   76 6f 72 62 69 73                           | vorbis         |          magic: "vorbis" (valid) 0x1-0x6.7 (6)
 0x000|                     22                        |       "        |          vorbis_codebook_count: 35 0x7-0x7.7 (1)
 0x000|                        42 43 56               |        BCV     |          codecooke_sync: 0x564342 (valid) 0x8-0xa.7 (3)
 0x000|                                 01 00         |           ..   |          codebook_dimensions: 1 0xb-0xc.7 (2)
 0x000|                                       40 00 00|             @..|          codebook_entries: 64 0xd-0xf.7 (3)
 0x010|24 73 18 2a 46 a5 73 16 84 10 1a 42 50 19 e3 1c|$s.*F.s....BP...|          unknown0: raw bits 0x10-0xc74.7 (3173)
 *    |until 0xc74.7 (end) (3173)                     |                |
      |                                               |                |        [3]: packet {} (vorbis_packet) 0x0-0x1e.7 (31)
 0x000|5c                                             |\               |          packet_type: "Audio" (0) 0x0-0x0.7 (1)
 0x000|   dd ab 3a ab ba b0 ff 5a 02 04 10 00 c0 8c da| ..:....Z.......|          unknown0: raw bits 0x1-0x1e.7 (30)
 0x010|2d b6 37 df 7c f3 cd 30 0c c3 30 0c c3 7a 00|  |-.7.|..0..0..z.||
      |                                               |                |        [4]: packet {} (vorbis_packet) 0x0-0x3b.7 (60)
 0x000|9a                                             |.               |          packet_type: "Audio" (0) 0x0-0x0.7 (1)
 0x000|   d8 3d 07 6f d2 9e 5b 5c 05 66 22 40 2a 00 00| .=.o..[\.f"@*..|          unknown0: raw bits 0x1-0x3b.7 (59)
 0x010|00 00 00 00 00 00 00 00 00 fa fd 60 9f ce 01 d1|...........`....|
 *    |until 0x3b.7 (end) (59)                        |                |
      |                                               |                |        [5]: packet {} (vorbis_packet) 0x0-0x33.7 (52)
 0x000|be                                             |.               |          packet_type: "Audio" (0) 0x0-0x0.7 (1)
 0x000|   d8 dd e6 ae 92 f7 23 3e 6f cc 0d 80 7a 00 00| ......#>o...z..|          unknown0: raw bits 0x1-0x33.7 (51)
 0x010|00 00 01 06 00 00 00 00 00 00 e0 b9 05 42 5c 27|.............B\'|
 *    |until 0x33.7 (end) (51)                        |                |
      |                                               |                |        [6]: packet {} (vorbis_packet) 0x0-0x7f.7 (128)
 0x000|3e                                             |>               |          packet_type: "Audio" (0) 0x0-0x0.7 (1)
 0x000|   37 dd 37 fe ee 85 47 7c 3c 61 02 9b 31 06 f6| 7.7...G|<a..1..|          unknown0: raw bits 0x1-0x7f.7 (127)
 0x010|bb ef 9f 04 62 46 41 04 c0 c0 00 00 f0 3d f4 1d|....bFA......=..|
 *    |until 0x7f.7 (end) (127)                       |                |