software defined, packaged inside the open source VHS-Decode & CVBS-Decode projects which evolved from the LD-Decode project this also introduced the .TBC file format a lossless 4fsc digital format not dissembler to D-2 & D-3 videotape storing uncompressed composite/s-video (combined or Luminance/Chrominance separated) analog video signals in 16-bit unsigned grey scale values these can be opened inside ld-analyse for frame by frame analysis or encoded to a lossless .mkv video file via FFMPEG. 1135x625 For PAL (17727262 hz) (25i) (4.2GB/min 70MB/s 560mbps) 910x525 For NTSC (14318181 hz) (29.97i) (3.4GB/min 56.66MB/s 453mbps) Methods Implicit in the idea of time base correction is that there must be some target time base that the corrector is aiming for. There are two time bases commonly used. The first method is to make the frames, fields and lines come out smoothly and uniformly, at the rates specified by the standards using an oscillator for time reference. The alternative to this method is to align the frames, fields, and lines with some external signal, a procedure called genlocking. Genlocking allows sources that are not themselves genlock-capable to be used with production switchers and A/B roll editing equipment. Stand-alone broadcast model time base correctors typically will genlock the signal to an external sync reference, and also allow the brightness, contrast, chrominance, and color phase ("tint" or "hue") to be adjusted. Some TBCs featured a Drop Out Compensation (DOC) circuit that enabled videotape flaws caused by oxide drop-out to be temporarily corrected. The DOC circuit required dedicated cabling between the videotape player and the TBC in which irregularities were detected in portions of the video image. Previously captured and stored lines of video would then be superimposed over the flawed video lines. A variant of the time base corrector is the which allows devices that cannot be "steered" by an advanced sync signal to also be time base corrected or timed into a system. Satellites, microwave transmitters and other broadcast signals as well as consumer VTRs cannot be sent an advance sync signal. The synchronizer accomplishes this by (first digitizing in an analog scenario and) writing the incoming digital video into a frame buffer memory using the timing of the sync information contained in that video signal. A frame synchronizer stores at least a full frame of video. Simultaneously the digital video is being read back out of the buffer by an independent timing system that is genlocked