The paragraph states the following:
"The number of channels within the Sound Track File shall be an even number. The inclusion of a channel of silence may be required to achieve this."
Annex A is normative, so "may" can be included in the text; however, the normative use of "may" denotes permission, not possibility.
Recommend:
"The number of channels within the Sound Track File shall be an even number. The inclusion of a channel of silence might be required to achieve this."
The paragraph states the following: "The number of channels within the Sound Track File shall be an even number. The inclusion of a channel of silence may be required to achieve this."
Annex A is normative, so "may" can be included in the text; however, the normative use of "may" denotes permission, not possibility.
Recommend: "The number of channels within the Sound Track File shall be an even number. The inclusion of a channel of silence might be required to achieve this."