Both formats are used to store MPEG-2 compressed video data. MPG4 is clearly the more commonly used format however its disadvantage is that if transmission is interrupted or the recording file is not closed properly , the entire file can be rendered unreadable. This occurs because the file information in MPG4 files is written at the end of the file and if this information is not added correctly , the file is considered “broken”. Alternatively the TS format (Transport Stream) can overcome these limitations by automatically adding file information after each key frame. Transport stream specifies a container format encapsulating packetized elementary streams, with error correction and synchronization pattern features for maintaining transmission integrity when the communication channel carrying the stream is degraded. Most video editing and playback software can handle both formats. Therefore it would be our recommendation to use the TS format to avoid “broken” video files should there be transmission errors or power losses.