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| author | Ralph Giles <giles@mozilla.com> | 2014-09-26 01:21:08 +0400 |
|---|---|---|
| committer | Ralph Giles <giles@mozilla.com> | 2014-09-26 21:34:42 +0400 |
| commit | 3c09b440b4e5140aa1f5c24ee49ac9d766b16b25 (patch) | |
| tree | 7ec0015fa1663e54fb600327834e421cd92cc568 /doc | |
| parent | da97db1ca1f92592af3534c9a2596da0e9a009ca (diff) | |
Import mp4 encapsulation spec v0.1.4.
Based on http://vfrmaniac.fushizen.eu/contents/opus_in_isobmff.html
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/opus_in_isobmff.html | 699 |
1 files changed, 699 insertions, 0 deletions
diff --git a/doc/opus_in_isobmff.html b/doc/opus_in_isobmff.html new file mode 100644 index 00000000..b7266492 --- /dev/null +++ b/doc/opus_in_isobmff.html @@ -0,0 +1,699 @@ +<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> +<html> + <head> + <link rel="stylesheet" type="text/css" href="../style.css"/> + <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> + <title>Encapsulation of Opus in ISO Base Media File Format</title> + </head> + <body bgcolor="0x333333" text="#60B0C0"> + <b><u>Encapsulation of Opus in ISO Base Media File Format</u></b><br> + <font size="2">last updated: September 26, 2014</font><br> + <br> + <div class="normal_link pre frame_box"> +<center>Encapsulation of Opus in ISO Base Media File Format</center> +<center>Version 0.1.4 (incomplete)</center> + +Table of Contents +<a href="#1">1</a> Scope +<a href="#2">2</a> Normative References +<a href="#3">3</a> Terms and Definitions +<a href="#4">4</a> Design Rules of Encapsulation + <a href="#4.1">4.1</a> File Type Indentification + <a href="#4.2">4.2</a> Basic Structure + <a href="#4.2.1">4.2.1</a> Initial Movie + <a href="#4.2.2">4.2.2</a> Movie Fragments + <a href="#4.3">4.3</a> Byte Order + <a href="#4.4">4.4</a> Definition of Opus sample + <a href="#4.4.1">4.4.1</a> Opus sample + <a href="#4.4.2">4.4.2</a> Duration of Opus sample + <a href="#4.5">4.5</a> Random Access + <a href="#4.5.1">4.5.1</a> Random Access Point + <a href="#4.5.2">4.5.2</a> Pre-roll + <a href="#4.6">4.6</a> Trimming of Actual Duration + <a href="#4.7">4.7</a> Additional Requirements, Restrictions, Recommendations and Definitions for Boxes + <a href="#4.7.1">4.7.1</a> File Type Box + <a href="#4.7.2">4.7.2</a> Segment Type Box + <a href="#4.7.3">4.7.3</a> Movie Header Box + <a href="#4.7.4">4.7.4</a> Track Header Box + <a href="#4.7.5">4.7.5</a> Edit Box + <a href="#4.7.6">4.7.6</a> Edit List Box + <a href="#4.7.7">4.7.7</a> Media Header Box + <a href="#4.7.8">4.7.8</a> Handler Reference Box + <a href="#4.7.9">4.7.9</a> Sound Media Header Box + <a href="#4.7.10">4.7.10</a> Sample Table Box + <a href="#4.7.11">4.7.11</a> OpusSampleEntry + <a href="#4.7.12">4.7.12</a> Opus Specific Box + <a href="#4.7.13">4.7.13</a> Sample Group Description Box + <a href="#4.7.14">4.7.14</a> Sample to Group Box + <a href="#4.7.15">4.7.15</a> Track Extends Box + <a href="#4.7.16">4.7.16</a> Track Fragment Box + <a href="#4.7.17">4.7.17</a> Track Fragment Header Box + <a href="#4.7.18">4.7.18</a> Track Fragment Run Box + <a href="#4.8">4.8</a> Example of Encapsulation +<a href="#5">5</a> Author's Address + +<a name="1"></a> +1 Scope + This specification specifies the fundamental way of the encapsulation of Opus coded bitstreams in ISO Base Media + file formats and its derivatives. + +<a name="2"></a> +2 Normative References + [1] ISO/IEC 14496-12:2012 Corrected version + Information technology — Coding of audio-visual objects — Part 12: ISO base media file format + + [2] ISO/IEC 14496-12:2012/Amd.1:2013 + Information technology — Coding of audio-visual objects — Part 12: ISO base media file format + AMENDMENT 1: Various enhancements including support for large metadata + + [3] RFC 6716 + Definition of the Opus Audio Codec + + [4] draft-ietf-codec-oggopus-04 + Ogg Encapsulation for the Opus Audio Codec + +<a name="3"></a> +3 Terms and Definitions + 3.1 actual duration + duration constructed from valid samples + + 3.2 edit + entry in the Edit List Box + + 3.3 padded samples + PCM samples after decoding Opus sample(s) which are not valid samples + + 3.4 priming samples + extra PCM samples after decoding Opus sample(s) at the beginning of the Opus bitstream + + 3.5 sample-accurate + for any PCM sample, a timestamp exactly matching its sampling timestamp is present in the media timeline. + + 3.6 valid samples + PCM samples after decoding Opus sample(s) corresponding to input PCM samples + +<a name="4"></a> +4 Design Rules of Encapsulation + 4.1 File Type Indentification<a name="4.1"></a> + This specification does not define brands to declare files are conformant to this specification. + TODO: Should we define such brands, e.g. 'Opus'. If we define the brand(s), we can utilize files conformant to + this specification for the storage of Opus coded bitstream without other derived file formats. +<a name="4.2"></a> + 4.2 Basic Structure + 4.2.1 Initial Movie<a name="4.2.1"></a> + This subclause specifies a basic structure of the Movie Box as follows: + + +----+----+----+----+----+----+----+----+------------------------------+ + |moov| | | | | | | | Movie Box | + +----+----+----+----+----+----+----+----+------------------------------+ + | |mvhd| | | | | | | Movie Header Box | + +----+----+----+----+----+----+----+----+------------------------------+ + | |trak| | | | | | | Track Box | + +----+----+----+----+----+----+----+----+------------------------------+ + | | |tkhd| | | | | | Track Header Box | + +----+----+----+----+----+----+----+----+------------------------------+ + | | |edts| | | | | | Edit Box | + +----+----+----+----+----+----+----+----+------------------------------+ + | | | |elst| | | | | Edit List Box | + +----+----+----+----+----+----+----+----+------------------------------+ + | | |mdia| | | | | | Media Box | + +----+----+----+----+----+----+----+----+------------------------------+ + | | | |mdhd| | | | | Media Header Box | + +----+----+----+----+----+----+----+----+------------------------------+ + | | | |hdlr| | | | | Handler Reference Box | + +----+----+----+----+----+----+----+----+------------------------------+ + | | | |minf| | | | | Media Information Box | + +----+----+----+----+----+----+----+----+------------------------------+ + | | | | |smhd| | | | Sound Media Information Box | + +----+----+----+----+----+----+----+----+------------------------------+ + | | | | |dinf| | | | Data Information Box | + +----+----+----+----+----+----+----+----+------------------------------+ + | | | | | |dref| | | Data Reference Box | + +----+----+----+----+----+----+----+----+------------------------------+ + | | | | | | |url | | DataEntryUrlBox | + +----+----+----+----+----+----+ or +----+------------------------------+ + | | | | | | |urn | | DataEntryUrnBox | + +----+----+----+----+----+----+----+----+------------------------------+ + | | | | |stbl| | | | Sample Table | + +----+----+----+----+----+----+----+----+------------------------------+ + | | | | | |stsd| | | Sample Description Box | + +----+----+----+----+----+----+----+----+------------------------------+ + | | | | | | |Opus| | OpusSampleEntry | + +----+----+----+----+----+----+----+----+------------------------------+ + | | | | | | | |dOps| Opus Specific Box | + +----+----+----+----+----+----+----+----+------------------------------+ + | | | | | |stts| | | Decoding Time to Sample Box | + +----+----+----+----+----+----+----+----+------------------------------+ + | | | | | |stsc| | | Sample To Chunk Box | + +----+----+----+----+----+----+----+----+------------------------------+ + | | | | | |stsz| | | Sample Size Box | + +----+----+----+----+----+ or +----+----+------------------------------+ + | | | | | |stz2| | | Compact Sample Size Box | + +----+----+----+----+----+----+----+----+------------------------------+ + | | | | | |stco| | | Chunk Offset Box | + +----+----+----+----+----+ or +----+----+------------------------------+ + | | | | | |co64| | | Chunk Large Offset Box | + +----+----+----+----+----+----+----+----+------------------------------+ + | | | | | |sgpd| | | Sample Group Description Box | + +----+----+----+----+----+----+----+----+------------------------------+ + | | | | | |sbgp| | | Sample to Group Box | + +----+----+----+----+----+----+----+----+------------------------------+ + | |mvex|* | | | | | | Movie Extends Box | + +----+----+----+----+----+----+----+----+------------------------------+ + | | |trex|* | | | | | Track Extends Box | + +----+----+----+----+----+----+----+----+------------------------------+ + + It is strongly recommended that the order of boxes should follow the above structure. + Boxes marked with an asterisk (*) may be present. + For some boxes listed above, the additional requirements, restrictions, recommendations and definitions + are specified in 4.7 Additional Requirements, Restrictions, Recommendations and Definitions for Boxes in + this specification. + For the others, the definition is as is defined in ISO/IEC 14496-12 [1]. + + 4.2.2 Movie Fragments<a name="4.2.2"></a> + This subclause specifies a basic structure of the Movie Fragment Box as follows: + + +----+----+----+----+----+----+----+----+------------------------------+ + |moof| | | | | | | | Movie Fragment Box | + +----+----+----+----+----+----+----+----+------------------------------+ + | |mfhd| | | | | | | Movie Fragment Header Box | + +----+----+----+----+----+----+----+----+------------------------------+ + | |traf| | | | | | | Track Fragment Box | + +----+----+----+----+----+----+----+----+------------------------------+ + | | |tfhd| | | | | | Track Fragment Header Box | + +----+----+----+----+----+----+----+----+------------------------------+ + | | |trun| | | | | | Track Fragment Run Box | + +----+----+----+----+----+----+----+----+------------------------------+ + | | |sgpd|* | | | | | Sample Group Description Box | + +----+----+----+----+----+----+----+----+------------------------------+ + | | |sbgp|* | | | | | Sample to Group Box | + +----+----+----+----+----+----+----+----+------------------------------+ + + It is strongly recommended that the Movie Fragment Header Box and the Track Fragment Header Box be + placed first in their container. + Boxes marked with an asterisk (*) may be present. + For some boxes listed above, the additional requirements, restrictions, recommendations and definitions + are specified in 4.7 Additional Requirements, Restrictions, Recommendations and Definitions for Boxes in + this specification. + For the others, the definition is as is defined in ISO/IEC 14496-12 [1]. +<a name="4.3"></a> + 4.3 Byte Order + The fields in the boxes are stored as big-endian format. + TODO: What about bytes in Opus samples? +<a name="4.4"></a> + 4.4 Definition of Opus sample + 4.4.1 Opus sample<a name="4.4.1"></a> + An Opus sample is exactly one Opus packet. + In this specification, 'sample' means 'Opus sample' except for 'padded samples', 'priming samples', 'valid + sample' and 'sample-accurate', i.e. 'sample' is 'sample' in the term defined in ISO/IEC 14496-12 [1]. + TODO: If an Opus packet consists of multiple Opus streams, it can be splitted into individual streams and + reconstructed into new Opus packets as long as every Opus stream has the same total duration in each + Opus packet. This requires additional channel mapping at outside of the existing Opus Specific Box. + The solution may be achieved by using track references and new channel mapping/layout indications. + Or should we forbid splitting into multiple tracks to avoid more complex implementations? + Or just use channel mapping other than what the existing Opus Specific Box does, such as bit masks? + + 4.4.2 Duration of Opus sample<a name="4.4.2"></a> + The duration of Opus sample is given by multiplying the least common multiple of the frame size in seconds + of all frames inside Opus packet by the value of the timescale field in the Media Header Box. + + To indicate the valid samples excluding the padded samples at the end of Opus bitstream, the duration of + the last Opus sample of an Opus bitstream is given by multiplying the number of the valid samples by the + value produced by dividing the value of the timescale field in the Media Header Box by 48000. +<a name="4.5"></a> + 4.5 Random Access + 4.5.1 Random Access Point<a name="4.5.1"></a> + All Opus packets can be independently decoded i.e. every Opus sample is a sync sample. + Therefore, the Sync Sample Box shall not be present. + + 4.5.2 Pre-roll<a name="4.5.2"></a> + Opus requires at least 80 milli-second pre-roll after each random access. + Pre-roll is indicated by the roll_distance field in AudioRollRecoveryEntry. AudioPreRollEntry shall not be + used since every Opus sample is a sync sample in Opus bitstream. + Note that roll_distance is expressed in sample units in a term of ISO Base Media File Format, and always + takes negative values. + + For the requirement of AudioRollRecoveryEntry, the compatible_brands field in the File Type Box and/or + the Segment Type Box shall contain at least one brand which requires support for roll groups. + See also 4.7.1 File Type Box and 4.7.2 Segment Type Box. +<a name="4.6"></a> + 4.6 Trimming of Actual Duration + Due to the priming samples (or the padding at the beginning) derived from the pre-roll for the startup and the + padding at the end, we need trim from media to get the actual duration before encoded. + An edit in the Edit List Box can achieve this demand. + For sample-accurate trimming, proper timescale should be set to the timescale field in the Movie Header Box + and the Media Header Box inside Track Box(es) for Opus bitstream. + + The Edit List Box is applied to whole movie including all movie fragments. Therefore, it is impossible to tell + the actual duration in the case producing movie fragments on the fly such as live-streaming. In such cases, + the duration of the last Opus sample may be helpful. + TODO: Should we define a new box which indicates the last Opus samples? + Since this specification allows multiple sample descriptions, i.e. allows concatenation of multiple Opus + bitstreams in a track, each Opus bitstream contains some padded samples. + Without such a box, we cannot know in container level whether an Opus sample is the last Opus sample in + an Opus bitstream or not. Is this preferable? + + See also 4.7.6 Edit List Box. +<a name="4.7"></a> + 4.7 Additional Requirements, Restrictions, Recommendations and Definitions for Boxes + 4.7.1 File Type Box<a name="4.7.1"></a> + For any track containing Opus bitstreams, the following requirements are applied. + + compatible_brands: + The compatible_brands fields shall contain at least one brand which requires support for roll groups + (e.g. the 'iso2' brand). + When enabling movie fragments and placing at least one Sample Group Description Box in Movie Fragments, + the compatible_brands fields shall also contain at least one brand which requires support of Sample + Group Description Boxes in Movie Fragments (e.g. the 'iso6' brand). + + 4.7.2 Segment Type Box<a name="4.7.2"></a> + For any track containing Opus bitstreams, the following requirements are applied. + + compatible_brands: + The same requirements as specified at 4.7.1 File Type Box are applied. + + 4.7.3 Movie Header Box<a name="4.7.3"></a> + If any track containing Opus bitstreams, the following recommendations are applied. + + timescale: + The timescale field should be set to the same value of the timescale field in the Media Header Box + inside Track Box(es) for Opus bitstream if no tracks for bitstreams other than Opus bitstream is present. + + 4.7.4 Track Header Box<a name="4.7.4"></a> + For any track containing Opus bitstreams, the following requirements are applied. + + layer: + The layer field shall be set to 0. + + matrix: + The matrix field shall be set to { 0x00010000,0,0,0,0x00010000,0,0,0,0x40000000 }. + + width: + The width field shall be set to 0. + + height: + The height field shall be set to 0. + + 4.7.5 Edit Box<a name="4.7.5"></a> + For any track containing Opus bitstreams, exactly one Edit Box shall be present. + + 4.7.6 Edit List Box<a name="4.7.6"></a> + For any track containing Opus bitstreams, exactly one Edit List Box shall be present. In addition, for + non-empty edits, the following recommendations are applied. + + segment_duration: + The segment_duration field is used to indicate the actual duration of Opus bitstream. + When the value of the timescale field in the Movie Header Box is equal to 48000, the segment_duration + should be set to the number of the actual samples before encoded. + When enabling movie fragments, the segment_duration field may be set to 0. The value 0 represents + implicit duration equal to the sum of the duration of all samples. This would be helpful for excluding + padded samples from the presentation timeline when producing movie fragments on the fly. + + media_time: + The media_time field is used to remove the priming samples of Opus bitstream. + When the value of the timescale field in the Media Header Box is equal to 48000, the media_time shall + be set to the number of priming samples to remove the priming samples for the first non-empty edit. + + 4.7.7 Media Header Box<a name="4.7.7"></a> + For any track containing Opus bitstreams, the following recommendation is applied. + + timescale: + The timescale field should be set to 48000 to access sample-accurately. + + 4.7.8 Handler Reference Box<a name="4.7.8"></a> + For any track containing Opus bitstreams, the following requirement is applied. + + handler_type: + The handler_type field shall be set to 'soun'. + + 4.7.9 Sound Media Header Box<a name="4.7.9"></a> + For any track containing Opus bitstreams, the Sound Media Header Box shall be present. + + 4.7.10 Sample Table Box<a name="4.7.10"></a> + For any track containing Opus bitstreams, at least one Sample Group Description Boxes and at least one + Sample to Group Boxes shall be present and the Sync Sample Box shall not be present. + + 4.7.11 OpusSampleEntry<a name="4.7.11"></a> + For any track containing Opus bitstreams, at least one OpusSampleEntry shall be present. + + The syntax and semantics of the OpusSampleEntry is shown as follows. + + class OpusSampleEntry() extends AudioSampleEntry ('Opus'){ + OpusSpecificBox(); + } + + + channelcount: + The channelcount field shall be set to the sum of the total number of Opus bitstreams and the number + of Opus bitstreams producing two channels. This value is indentical with (M+N), where M is the value of + the *Coupled Stream Count* field and N is the value of the *Stream Count* field in the *Channel Mapping + Table* in the identification header defined in Ogg Opus [4]. + + samplesize: + The samplesize field shall be set to 16. + + samplerate: + The samplerate field shall be set to 48000<<16. + + 4.7.12 Opus Specific Box<a name="4.7.12"></a> + Exactly one Opus Specific Box shall be present in each OpusSampleEntry. + + The syntax and semantics of the Opus Specific Box is shown as follows. + + aligned(8) class OpusSpecificBox extends FullBox('dOps', version, dflags){ + if (flags & 0x000001) { + unsigned int(16) PreSkip; + } + unsigned int(32) InputSampleRate; + signed int(16) OutputGain; + unsigned int(8) OutputChannelCount; + unsigned int(8) ChannelMappingFamily; + if (ChannelMappingFamily != 0) { + unsigned int(8 * (2 + OutputChannelCount)) ChannelMappingTable; + } + } + + + version: + The version field shall be set to 0. + + flags: + The following flags are defined in the dflags: + 0x000001 pre-skip-present: + This flag indicates the presence of the PreSkip field. + + PreSkip: + The PreSkip field shall be set to the same value as the *Pre-skip* field in the identification header + defined in Ogg Opus [4]. Note that the value is stored as big-endian format. + This field can be absent after removing Opus samples containing the number of PCM samples more than the + number of the priming samples. + This field is not used for removing the priming samples at playback. + + InputSampleRate: + The InputSampleRate field shall be set to the same value as the *Input Sample Rate* field in the + identification header defined in Ogg Opus [4]. Note that the value is stored as big-endian format. + + OutputGain: + The OutputGain field shall be set to the same value as the *Output Gain* field in the identification + header define in Ogg Opus [4]. Note that the value is stored as big-endian format. + + OutputChannelCount: + The OutputChannelCount field shall be set to the same value as the *Output Channel Count* field in the + identification header defined in Ogg Opus [4]. + + ChannelMappingFamily: + The ChannelMappingFamily field shall be set to the same value as the *Channel Mapping Family* field in + the identification header defined in Ogg Opus [4]. + + ChannelMappingTable: + The ChannelMappingTable field shall be set to the same octet string as *Channel Mapping Table* field in + the identification header defined in Ogg Opus [4]. + + 4.7.13 Sample Group Description Box<a name="4.7.13"></a> + For any track containing Opus bitstreams, at least one Sample Group Description Box shall be present and have + the grouping_type field set to 'roll'. See also 4.5.2 Pre-roll. + + 4.7.14 Sample to Group Box<a name="4.7.14"></a> + For any track containing Opus bitstreams, at least one Sample to Group Box shall be present and have the + grouping_type field set to 'roll'. In addition, the following requirement is applied. + + group_description_index: + The group_description_index fields shall not be set to 0 if the grouping_type field set to 'roll'. + + 4.7.15 Track Extends Box<a name="4.7.15"></a> + For any track containing Opus bitstreams, the following requirement is applied. + + default_sample_flags: + The sample_is_non_sync_sample field shall be set to 0. + + 4.7.16 Track Fragment Box<a name="4.7.16"></a> + For any track containing Opus bitstreams, if any sample is contained in track fragment, the Sample to + Group Box with the grouping_type field set to 'roll' shall be present for that track fragment. + + 4.7.17 Track Fragment Header Box<a name="4.7.17"></a> + For any track containing Opus bitstreams, the following requirement is applied. + + default_sample_flags: + The sample_is_non_sync_sample field shall be set to 0. + + 4.7.18 Track Fragment Run Box<a name="4.7.18"></a> + For any track containing Opus bitstreams, the following requirements are applied. + + first_sample_flags: + The sample_is_non_sync_sample field shall be set to 0. + + sample_flags: + The sample_is_non_sync_sample field shall be set to 0. +<a name="4.8"></a> + 4.8 Example of Encapsulation + [File] + size = 10349 + [ftyp: File Type Box] + position = 0 + size = 24 + major_brand = mp42 : MP4 version 2 + minor_version = 0 + compatible_brands + brand[0] = mp42 : MP4 version 2 + brand[1] = iso2 : ISO Base Media file format version 2 + [free: Free Space Box] + position = 24 + size = 8 + [mdat: Media Data Box] + position = 32 + size = 9551 + [moov: Movie Box] + position = 9583 + size = 766 + [mvhd: Movie Header Box] + position = 9591 + size = 108 + version = 0 + flags = 0x000000 + creation_time = UTC 2014/09/23, 15:23:21 + modification_time = UTC 2014/09/23, 15:23:21 + timescale = 48000 + duration = 33600 (00:00:07.000) + rate = 1.000000 + volume = 1.000000 + reserved = 0x0000 + reserved = 0x00000000 + reserved = 0x00000000 + transformation matrix + | a, b, u | | 1.000000, 0.000000, 0.000000 | + | c, d, v | = | 0.000000, 1.000000, 0.000000 | + | x, y, w | | 0.000000, 0.000000, 1.000000 | + pre_defined = 0x00000000 + pre_defined = 0x00000000 + pre_defined = 0x00000000 + pre_defined = 0x00000000 + pre_defined = 0x00000000 + pre_defined = 0x00000000 + next_track_ID = 2 + [iods: Object Descriptor Box] + position = 9699 + size = 33 + version = 0 + flags = 0x000000 + [tag = 0x10: MP4_IOD] + expandableClassSize = 16 + ObjectDescriptorID = 1 + URL_Flag = 0 + includeInlineProfileLevelFlag = 0 + reserved = 0xf + ODProfileLevelIndication = 0xff + sceneProfileLevelIndication = 0xff + audioProfileLevelIndication = 0xfe + visualProfileLevelIndication = 0xff + graphicsProfileLevelIndication = 0xff + [tag = 0x0e: ES_ID_Inc] + expandableClassSize = 4 + Track_ID = 1 + [trak: Track Box] + position = 9732 + size = 617 + [tkhd: Track Header Box] + position = 9740 + size = 92 + version = 0 + flags = 0x000007 + Track enabled + Track in movie + Track in preview + creation_time = UTC 2014/09/23, 15:23:21 + modification_time = UTC 2014/09/23, 15:23:21 + track_ID = 1 + reserved = 0x00000000 + duration = 33600 (00:00:07.000) + reserved = 0x00000000 + reserved = 0x00000000 + layer = 0 + alternate_group = 0 + volume = 1.000000 + reserved = 0x0000 + transformation matrix + | a, b, u | | 1.000000, 0.000000, 0.000000 | + | c, d, v | = | 0.000000, 1.000000, 0.000000 | + | x, y, w | | 0.000000, 0.000000, 1.000000 | + width = 0.000000 + height = 0.000000 + [edts: Edit Box] + position = 9832 + size = 36 + [elst: Edit List Box] + position = 9840 + size = 28 + version = 0 + flags = 0x000000 + entry_count = 1 + entry[0] + segment_duration = 33600 + media_time = 3840 + media_rate = 1.000000 + [mdia: Media Box] + position = 9868 + size = 481 + [mdhd: Media Header Box] + position = 9876 + size = 32 + version = 0 + flags = 0x000000 + creation_time = UTC 2014/09/23, 15:23:21 + modification_time = UTC 2014/09/23, 15:23:21 + timescale = 48000 + duration = 38400 (00:00:08.000) + language = und + pre_defined = 0x0000 + [hdlr: Handler Reference Box] + position = 9908 + size = 51 + version = 0 + flags = 0x000000 + pre_defined = 0x00000000 + handler_type = soun + reserved = 0x00000000 + reserved = 0x00000000 + reserved = 0x00000000 + name = Xiph Audio Handler + [minf: Media Information Box] + position = 9959 + size = 390 + [smhd: Sound Media Header Box] + position = 9967 + size = 16 + version = 0 + flags = 0x000000 + balance = 0.000000 + reserved = 0x0000 + [dinf: Data Information Box] + position = 9983 + size = 36 + [dref: Data Reference Box] + position = 9991 + size = 28 + version = 0 + flags = 0x000000 + entry_count = 1 + [url : Data Entry Url Box] + position = 10007 + size = 12 + version = 0 + flags = 0x000001 + location = in the same file + [stbl: Sample Table Box] + position = 10019 + size = 330 + [stsd: Sample Description Box] + position = 10027 + size = 72 + version = 0 + flags = 0x000000 + entry_count = 1 + [Opus: Audio Description] + position = 10043 + size = 56 + reserved = 0x000000000000 + data_reference_index = 1 + reserved = 0x0000 + reserved = 0x0000 + reserved = 0x00000000 + channelcount = 2 + samplesize = 16 + pre_defined = 0 + reserved = 0 + samplerate = 48000.000000 + [dOps: Opus Specific Box] + position = 10071 + size = 20 + version = 0 + flags = 0x000000 + InputSampleRate = 44100 + OutputGain = 0.000000 + OutputChannelCount = 2 + ChannelMappingFamily = 0 + [stts: Decoding Time to Sample Box] + position = 10099 + size = 24 + version = 0 + flags = 0x000000 + entry_count = 1 + entry[0] + sample_count = 10 + sample_delta = 3840 + [stsc: Sample To Chunk Box] + position = 10123 + size = 40 + version = 0 + flags = 0x000000 + entry_count = 2 + entry[0] + first_chunk = 1 + samples_per_chunk = 4 + sample_description_index = 1 + entry[1] + first_chunk = 3 + samples_per_chunk = 2 + sample_description_index = 1 + [stsz: Sample Size Box] + position = 10163 + size = 60 + version = 0 + flags = 0x000000 + sample_size = 0 (variable) + sample_count = 10 + entry_size[0] = 780 + entry_size[1] = 920 + entry_size[2] = 963 + entry_size[3] = 988 + entry_size[4] = 1024 + entry_size[5] = 951 + entry_size[6] = 933 + entry_size[7] = 1017 + entry_size[8] = 992 + entry_size[9] = 975 + [stco: Chunk Offset Box] + position = 10223 + size = 28 + version = 0 + flags = 0x000000 + entry_count = 3 + chunk_offset[0] = 40 + chunk_offset[1] = 3691 + chunk_offset[2] = 7616 + [sgpd: Sample Group Description Box] + position = 10251 + size = 30 + version = 1 + flags = 0x000000 + grouping_type = roll + default_length = 2 (constant) + entry_count = 3 + roll_distance[0] = -1 + roll_distance[1] = -2 + roll_distance[2] = -3 + [sbgp: Sample to Group Box] + position = 10281 + size = 68 + version = 0 + flags = 0x000000 + grouping_type = roll + entry_count = 6 + entry[0] + sample_count = 2 + group_description_index = 1 + entry[1] + sample_count = 1 + group_description_index = 2 + entry[2] + sample_count = 1 + group_description_index = 3 + entry[3] + sample_count = 1 + group_description_index = 2 + entry[4] + sample_count = 3 + group_description_index = 3 + entry[5] + sample_count = 2 + group_description_index = 1 + +<a name="5"></a> +5 Authors' Address + Yusuke Nakamura + Email: muken.the.vfrmaniac |at| gmail.com + </div> + </body> +</html> |