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AVCHD - Wikipedia. AVCHD (Advanced Video Coding High Definition). Both Panasonic and Sony released the first consumer AVCHD camcorders in spring of 2. The new video modes require double the data rate of previous modes. AVCHD and its logo are trademarks of Sony and Panasonic. For audio compression, it supports both Dolby AC- 3 (Dolby Digital) and uncompressed linear PCM audio. Stereo and multichannel surround (5.
Aside from recorded audio and video, AVCHD includes many user- friendly features to improve media presentation: menu navigation, simple slide shows and subtitles. The menu navigation system is similar to DVD- video, allowing access to individual videos from a common intro screen. Slide shows are prepared from a sequence of AVC still frames, and can be accompanied by a background audio track.
Subtitles are used in some camcorders to timestamp the recordings. Audio, video, subtitle, and ancillary streams are multiplexed into an MPEG transport stream and stored on media as binary files. Usually, memory cards and HDDs use the FAT file system, while optical discs employ UDF or ISO9. At the file system level, the structure of AVCHD is derived from the Blu- ray Disc specification, but is not identical to it. In particular, it uses legacy . Another difference is location of the BDMV directory, which contains media files. On a DVD- based camcorder the BDMV directory is placed at the root level, as on the Blu- ray Disc.
On the HDD- based Canon HG1. BDMV directory is located in the AVCHD directory, which is placed at the root level. Removable media like SDHC and Memory Stick cards or DVDs can be read on a computer directly. Copying files from an AVCHD camcorder or from removable media can be performed faster than from a tape- based camcorder, because the transfer speed is not limited by realtime playback. Just as editing DVCPRO HD and HDV video once demanded an expensive high- end computer, AVCHD editing software requires powerful machines.
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Compared to HDV, AVCHD requires 2- 4x the processing power for realtime playback, placing a greater burden on the computer's CPU and graphics card. Improvements in multi- core computing and graphics processor acceleration bring AVCHD playback to mainstream desktops and laptops. Video formats. The licensing body of the specification defines a variety of labels for products compliant with specific features.
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Most AVCHD camcorders support only a handful of the video and audio formats allowed in the AVCHD standard. Interlaced video. AVCHD 1. 08. 0i is available on most AVCHD camcorders.
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For some models this is the only recording mode offered. AVCHD- SD is used in the shoulder- mount Panasonic HDC- MDH1. A successor model - the AG- AC8, is also capable of recording in AVCHD- SD mode. AVCHD- SD is not compatible with consumer DVD players, because it employs AVC video encoding instead of MPEG- 2 Part 2. AVCHD- SD can be played on a Blu- ray Disc player without re- encoding. Interlaced video had been originally designed for watching on a cathode- ray tube television set.
Material recorded for interlaced presentation may exhibit combing or ghosting when it is rescaled, filmed out or watched on a computer or another progressive- scan device without proper deinterlacing. Some AVCHD 1. 08. In particular, Progressive segmented frame (Ps. F) is utilized in some Panasonic (2. Digital Cinema), Canon (PF2. PF3. 0) and Sony camcorders. The 2: 3 pulldown technique is used in some 6.
Hz versions of Canon (PF2. Panasonic (2. 4p Digital Cinema) camcorders for recording 2. Most editing tools treat progressive video recorded within an interlaced stream as interlaced, though some editing systems and most standalone Blu- ray Disc players are capable of recognizing the pulldown pattern to recover the original frames using the process known as inverse telecine. Progressive- scan video. Frame rates of 2. Many of the digital compact cameras made by Panasonic, such as the DMC- ZS3/DMC- TZ7, DMC- FT1, DMC- FZ3. DMC- FZ3. 8, and DMC- ZS- 7/TZ- 1.
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AVCHD Lite (see below). Until the advent of AVCHD Progressive mode, native progressive- scan video for 1.
In 2. 01. 0, Panasonic introduced a new lineup of consumer AVCHD camcorders with 1. This mode uses the same AVCHD folder structure and container files for storing video, with the maximum bitrate of 2. Mbit/s. In 2. 01. Sony introduced consumer and professional AVCHD models capable of AVCHD Progressive recording. In 2. 01. 2 JVC announced the GY- HMQ1.
AVCHD Progressive video. Audio formats. Stereo and multichannel audio is supported. Audio data rate can range from 6. In practice, data rates of 2. Recording capacity of an 8 cm disc ranges from 1.
GB for a single- sided single layer disc to 5. GB for a double- sided double layer disc. Pros: DVDs are familiar to most consumers, thus considered user- friendly.
Recordable DVDs are relatively cheap. Recorded disc can be played back in most Blu- ray Disc players.
Discs can be used for long- term storage of recorded video. Cons: Some argue that the longevity of recordable DVDs may be shorter than expected. No DVD- based AVCHD camcorders have been produced since 2.
While DVDs are no longer used for acquisition, they remain popular as distribution media. Many authoring programs offer . Such AVCHD discs are incompatible with regular DVD- Video players, but play in many Blu- ray Disc players. A conventional single- layer 1. DVD can store 3. 5 minutes of video recorded at the maximum bitrate the AVCHD specification allows for DVD media—1. Mbit/s. Hard disk drive. The HDD may fail if the camcorder is used at altitudes above 3,0.
Vulnerable to mechanical shock or fast movement. All HDD- based AVCHD camcorders employ non- removable disks. To transfer video to a computer the camcorder must be connected with a USB cable. Most camcorders require using an AC power adapter for this operation.
The sound of moving magnetic heads may be heard in the recorded video when recording in quiet environment. Replacing a damaged HDD requires disassembling a camcorder and cannot be done by a consumer. Solid- state memory card. Solid- state memory cards offer rewritable storage in a compact form factor with no moving parts. Panasonic and Sony chose removable flash memory as the sole type of recording media in their professional AVCHD lineups, specifically AVCCAM and NXCAM. Until 2. 01. 0, Sony insisted on usage of its own memory card format - Memory Stick. Since 2. 01. 0, Sony has allowed using both Memory Stick as well as Secure Digital cards in its consumer and professional camcorders.
Panasonic as well as other manufacturers of AVCHD camcorders use Secure Digital cards as removable flash media. Most models accept Secure Digital High Capacity cards (SDHC), while some models are also compatible with Secure Digital Extended Capacity (SDXC) cards, which offer higher transfer speed and capacity. Pros: Compact and lightweight. Does not require time for spin- up and initialization. Not vulnerable to magnetic fields. Can withstand a wider range of air pressure, humidity and vibration than HDDs.
Can be easily backed up to DVD for viewing and for long- term archiving. Usage of an AC power adapter may be required.
Non- removable media cannot be shared, sent or stored separately of the camcorder. If damaged or worn out, non- removable media cannot easily be replaced like a memory card. Branding. As of 2. AVCHD Lite seems to have been all but replaced with other formats. For example, the Panasonic DMC FZ- 2.
AVCHD Progressive recording mode (5. MP4 mode (2. 5fps/3. Some of these professional features listed in early Panasonic advertising materials included 1/3- inch progressive 3.
CCD sensor, XLR microphone input, solid- state media and capability of recording at the maximum AVCHD bitrate - 2. Mbit/s. The aforementioned features are not exclusive to AVCCAM. Moreover, some of these features like CCD sensor technology have been dropped by Panasonic, while 2. Mbit/s recording rate is widely available from rival manufacturers even on consumer models.
AVCHD Pro. Panasonic touts that the camcorder is .