Update comment

Author: Dadido3

mxv/reader.go

@@ -168,7 +168,7 @@ func (r *Reader) VideoFrameData(frame int) (io.Reader, error) {
 	}
 
 	// Check size, but only if the VideoFrameChunkSize field is != 0.
-	// May be some sort of corruption that occurs in older MXV files.
+	// VideoFrameChunkSize being zero may be some sort of corruption that occurs in older MXV files.
 	if vfte.VideoFrameChunkSize != 0 && chunk.Length() != int64(vfte.VideoFrameChunkSize) {
 		return nil, fmt.Errorf("parsed chunk is of wrong size. Got %d bytes, want %d bytes", chunk.Length(), vfte.VideoFrameChunkSize)
 	}
@@ -243,7 +243,7 @@ func (r *Reader) AudioFrameData(frame int) (reader io.Reader, startSample uint64
 	}
 
 	// Check size, but only if the AudioFrameChunkSize field is != 0.
-	// May be some sort of corruption that occurs in older MXV files.
+	// AudioFrameChunkSize being zero may be some sort of corruption that occurs in older MXV files.
 	if afte.AudioFrameChunkSize != 0 && chunk.Length() != int64(afte.AudioFrameChunkSize) {
 		return nil, 0, 0, fmt.Errorf("parsed chunk is of wrong size. Got %d bytes, want %d bytes", chunk.Length(), afte.AudioFrameChunkSize)
 	}