pub fn h264_first_slice_nal_offset(data: &[u8]) -> Option<u32>
Scan an Annex-B H.264 sample for the first coded-slice NAL (types 1 / 5 / 19) and return its byte offset within data. Parallel to hevc_first_slice_nal_offset.
data
hevc_first_slice_nal_offset