A telesync (TS) is a bootleg recording of a film recorded in a movie theater, often (although not always) filmed using a professional camera on a tripod in the projection booth. The audio of a TS is captured with a direct connection to the sound source (often an FM microbroadcast provided for the hearing-impaired, or from a drive-in theater). Sometimes the bootlegger will tape or conceal wireless microphones close to the speakers for better sound quality. A TS can be considered a higher quality type of cam, that has the potential of better-quality audio and video.
The true definition of telesync would include the film being synchronized to the camera's own frame rate and shutter timing as done by television companies when preparing celluloid film for broadcast. A bootleg TS rarely, if ever, uses this form of synchronisation which can lead to additional temporal aliasing.
As technology gets better, the quality of telesyncs also improves, although even the best telesyncs are lossy and will be inferior in quality to direct rips from Blu-ray, DVD or digital transfers from the film itself (see telecine). Some release groups use high-definition video cameras to get the clearest picture possible. When an unlicensed copy of a film exists even before its official publication, it is often because a telesync version could be easily produced.
In the German warez scene additional tags for the audio source can be added to a telesync release. These are LD (line dubbed) for when the audio track of an unlicensed copy has been ripped from the line out connection of a projector or MD (mic dubbed) when a microphone is used for the recording. These tags are not used exclusively on cam releases though.
A telesync is a film recorded on a professional camera (often a digital beta-cam).The cameras are placed on steady tripods and the films are recorded in an empty cinema from the main projection booth. The sound is often recorded straight from the mixing board, giving the telesync a high quality of sound. Some releases even include surround sound in Audio Compression 3 (AC3) format. Telesyncs are the most common of early releases, often being the first release a movie site accepts. Telesync movies are easier to watch than their CAM counterparts, although the picture quality is usually slightly washed out and the contrast is often out of balance. Telesyncs are commonly traded on movie sites. They are the lowest quality allowed, but are still popular with many file traders.
Pirated movies exist even before their official release since the Telesync (TS) version of movies shot in the cinema can be easily produced.