{"id":8774,"date":"2020-01-09T00:59:05","date_gmt":"2020-01-09T00:59:05","guid":{"rendered":"https:\/\/www.cleverfiles.com\/howto\/?p=8774"},"modified":"2020-01-09T00:59:05","modified_gmt":"2020-01-09T00:59:05","slug":"common-questions-dv-files-recovery","status":"publish","type":"post","link":"https:\/\/www.cleverfiles.com\/howto\/recover-deleted-dv.html","title":{"rendered":"The Most Common Questions about DV Files Recovery"},"content":{"rendered":"

<\/span>What Is DV File Format?<\/b><\/span><\/h2>\r\n
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<\/span>Characteristics and Uses<\/b><\/span><\/h3>\r\n

A Digital Video (DV) file is a file created by a digital camera, and saved using a standard raw format. A DV file is formed of Digital Interface Blocks (DIF), each of 80 bytes. DIF blocks can contain audio, video and metadata. DIF blocks can be stored as computer files in raw form, or wrapped in file formats. The blocks are multiplexed into 150-block sequences. A video frame contains 10 or 12 sequences. In tapes, each track contains a sequence. The resulting data rate is 25 Mbits\/s.<br\/ ><br\/ >A DV file uses lossy compression of video. Audio is stored uncompressed. The video is compressed on a frame by frame base, using an algorithm based on the discrete cosine transform. Video interlaced scanning is done with a frequency of 13.5 MHz, resulting in 480 and 576 scan lines for the 60 Hz system and the 50 Hz system respectively. In both cases the active area contains 720 pixels per scanline, with 704 for content and 16 for blank on the sides. Audio can be stored in 16-bit Linear PCM stereo at 48 kHz sampling rate. Alternatively, it can also be stored in four non-linear PCM channels at 32 kHz sampling rate. The specification also supports 16-bit audio at 44 kHz. However, the 48 kHz stereo mode is used most frequently. Originally developed for tape recording, it can be used to store material in optical discs, solid state flash memory cards and hard disk drives.<\/p>\r\n

<\/span>Brief History<\/b><\/span><\/h3>\r\n

The DV file format<\/a> specification was developed in 1995 and documented as IEC 61834. It is known as Blue Book and intended for recording to tape. The spec publication is sold by IEC and ANSI.\u00a0In 2003 it was complemented by the HDV standard, which uses the same tape format, but with different video codec. Some companies have created their own improved proprietary versions of DV files. For example, Panasonic developed the DVCPRO standard in 1995 and the DICPRO50 in 1997. Sony created the DVCAM file format in 1996.<\/p>\r\n

<\/span>Programs That Open DV Files<\/b><\/span><\/h3>\r\n

Windows<\/strong><\/em>:<\/p>\r\n