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fix: preparation typo fixes for ISOBMFF binding text #125

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Jul 18, 2025
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fix: preparation typo fixes for ISOBMFF binding text #125

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fix: preparation typo fixes for ISOBMFF binding text
bradh Jul 17, 2025
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Update readme/apv_isobmff.md
bradh Jul 17, 2025
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16 changes: 8 additions & 8 deletions readme/apv_isobmff.md
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@@ -1,5 +1,5 @@
ISOBMFF binding for APV
==============
=======================

# Introduction

Expand Down Expand Up @@ -53,7 +53,7 @@ The compressorname field of the VisualSampleEntry shall have '\012APV Coding'. T

### Description

The box with APVCodecConfigurationBox shall contains APVDecoderConfigurationRecord as defined in {{APVDecoderConfigurationRecord}}
The box with APVCodecConfigurationBox shall contain an APVDecoderConfigurationRecord as defined in {{APVDecoderConfigurationRecord}}

### Syntax

Expand Down Expand Up @@ -111,7 +111,7 @@ aligned(8) class APVDecoderConfigurationRecord {
> indicates the value of the pbu_type field in the pbu header immediately preceding the frame data for a certain index i.

+ number_of_frame_info[i]
> indicates the number of variations of the frame header information for the frames whose value of the pbu_type field in the pbu header immediately preceding it is idendtical with the value of the pub_type[i] field for a certain index i.
> indicates the number of variations of the frame header information for the frames whose value of the pbu_type field in the pbu header immediately preceding it is identical to the value of the pub_type[i] field for a certain index i.

+ color_description_present_flag[i][j]
>indicates whether the color description information is provided for the jth variation of frame header whose value of the pbu_type field in the pbu header immediately preceding it is identical with the value of the pbu_type[i] field for a certain index i.
Expand Down Expand Up @@ -150,16 +150,16 @@ aligned(8) class APVDecoderConfigurationRecord {
> indicates the value of the transfer_characteristics field in the jth variation of the frame header of the frames whose value of the pbu_type field in the pbu header immediately preceding it is identical with the value of the pbu_type[i] field for a certain index i. If the value of number_of_frame_info[i] is 1, then the same value of this field must be used as the value of the transfer_characteristics field in the frame header of the frames whose value of the pbu_type field in the pbu header immediately preceding it is identical with the value of the pbu_type[i] field for a certain index i. If the value of number_of_frame_info[i] is 1 is greater than 1, then the frame header in each sample must provide the value of transfer_characteristics field matched with one among the values of this field for all index j for the frames whose value of the pbu_type field in the pbu header immediately preceding it is identical with the value of the pbu_type[i] field for a certain index i.

+ matrix_coefficients[i][j]
> indicates the value of the matrix_coefficients field in the jth variation of the frame header of the frames whose value of the pbu_type field in the pbu header immediately preceding it is identical with the value of the pbu_type[i] field for a certain index i. If the value of number_of_frame_info[i] is 1, then the same value of this field must be used as the value of the matrix_coefficients field in the frame header of the frames whose value of the pbu_type field in the pbu header immediately preceding it is identical with the value of the pbu_type[i] field for a certain index i. If the value of number_of_frame_info[i] is 1 is greater than 1, then the frame header in each sample must provide the value of matrix_cofficients field matched with one among the values of this field for all index j for the frames whose value of the pbu_type field in the pbu header immediately preceding it is identical with the value of the pbu_type[i] field for a certain index i.
> indicates the value of the matrix_coefficients field in the jth variation of the frame header of the frames whose value of the pbu_type field in the pbu header immediately preceding it is identical with the value of the pbu_type[i] field for a certain index i. If the value of number_of_frame_info[i] is 1, then the same value of this field must be used as the value of the matrix_coefficients field in the frame header of the frames whose value of the pbu_type field in the pbu header immediately preceding it is identical with the value of the pbu_type[i] field for a certain index i. If the value of number_of_frame_info[i] is 1 is greater than 1, then the frame header in each sample must provide the value of matrix_coefficients field matched with one among the values of this field for all index j for the frames whose value of the pbu_type field in the pbu header immediately preceding it is identical with the value of the pbu_type[i] field for a certain index i.

+ full_range_flag[i][j]
> indicates the value of the full_range_flag field in the jth variation of the frame header of the frames whose value of the pbu_type field in the pbu header immediately preceding it is identical with the value of the pbu_type[i] field for a certain index i. If the value of number_of_frame_info[i] is 1, then the same value of this field must be used as the value of
the full_range_flag field in the frame header of the frames whose value of the pbu_type field in the pbu header immediately preceding it is identical with the value of the pbu_type[i] field for a certain index i. If the value of number_of_frame_info[i] is 1 is greater than 1, then the frame header in each sample must provide the value of matrix_cofficients field matched with one among the values of this field for all index j for the frames whose value of the pbu_type field in the pbu header immediately preceding it is identical with the value of the pbu_type[i] field for a certain index i.
the full_range_flag field in the frame header of the frames whose value of the pbu_type field in the pbu header immediately preceding it is identical with the value of the pbu_type[i] field for a certain index i. If the value of number_of_frame_info[i] is 1 is greater than 1, then the frame header in each sample must provide the value of matrix_coefficients field matched with one among the values of this field for all index j for the frames whose value of the pbu_type field in the pbu header immediately preceding it is identical with the value of the pbu_type[i] field for a certain index i.

## APV Sample Description

### Format of sample
When APV coded bitstream is encapsulated in a track with APVSampleEntry, each sample shall contain one and only one access unit of APV coded data. The format of sample shall be same as the raw_bitstream_access_unit, the length field of four bytes preceeding the access unit data, as defined in the section 12.1 of [APV codec specification](#apv-codec).
When APV coded bitstream is encapsulated in a track with APVSampleEntry, each sample shall contain one and only one access unit of APV coded data. The format of sample shall be same as the raw_bitstream_access_unit, the length field of four bytes preceding the access unit data, as defined in the section 12.1 of [APV codec specification](#apv-codec).

### Sync sample
Every samples of APV bitstream shall be sync samples.
Expand Down Expand Up @@ -188,9 +188,9 @@ else {

tile_index for sub-samples based on tiles, this parameter indicates the tile index in raster order in a frame.

# Sub-parameters for the MIME tyype 'codecs' parameter
## Sub-parameters for the MIME type 'codecs' parameter
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@kpchoi kpchoi Jul 17, 2025

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I think single '#' is correct because it is totally different topic from ISOBMFF.

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@bradh bradh Jul 17, 2025

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OK. I saw the MIME type as a property of the video file, not as a property of APV in ISOBMFF in general. However since this is just for the codecs, that will probably be common between video and images (assuming images becomes acceptable).


When the 'codecs' parameter of a MIME type is used for a track containing APV bistream, as defined in IETF RFC 6381, the sub-parameters defined in this section is used.
When the 'codecs' parameter of a MIME type is used for a track containing APV bitstream, as defined in IETF RFC 6381, the sub-parameters defined in this section is used.

The 'codecs' parameter string for the APV bitstream is defined as follows:

Expand Down