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Some videos include zero length NAL units in the length-delimited MP4 samples. Empty NAL units are not spec-compliant (see ISO/IEC 14496-15 section 4.3.3.3), but other players are able to play these videos (with warnings or errors). With this change, we check track.sampleTable.sizes[sampleIndex] before reading a byte from the NAL unit itself. PiperOrigin-RevId: 711720621