H264: fix botw 1080p cutscene green screen

[lijunyu-cn]

No description provided.

[Exzap]

can you explain the changes

[rcaridade145]

This does conflict with #1894

[lijunyu-cn]

Typically, the length parameter passed to H264DECGetImageSize points to several bytes after the end of the SPS NAL unit. These extra bytes are passed into h264Parser_ParseSPS, which eventually returns false when readTrailingRBSPBits is called within parseNAL_seq_parameter_set_rbsp. This behavior causes H264DECGetImageSize to consistently fail to obtain the correct width and height values.

Considering that h264Parser_ParseSPS, parseNAL_seq_parameter_set_rbsp, and readTrailingRBSPBits are very fundamental decoder functions, much existing code might rely on their current behavior. Therefore, I only made modifications within H264DECGetImageSize. By simply truncating the extra data after the first found SPS NAL unit, h264Parser_ParseSPS can now return the correct width and height parameters.