Demeler deinterlacing technology rapidly converts each field to a frame using GPUs. We have made many converted sequences available, first interlaced (via Meler) and then deinterlaced using Demeler - these are accessible at Viewing Examples of Demeler Output Video. However, these clips are at high frame rates, so we strongly recommend you read our guide to Smooth Viewing first.
Demeler always passes through the original fields to the output frames unchanged, while producing very little flicker. Most other deinterlacers either unavoidably produce flicker, or apply lowpass filtering on their output frames to reduce flicker. Filtering also irrecoverably reduces output resolution, and does not allow deinterlaced archives to replace interlaced archives without data loss.
Demeler's output can be objectively measured by:
Each field is deinterlaced to a frame, requiring interpolation of missing lines. If the interpolated lines are "wrong", then this results in flicker, and less effective compression and/or reduced SNR in order to encode that flicker. When Demeler output is compressed by x264 (in the latter's default Constant Rate Factor mode), bitrates reduce by about 21.3% on average versus compressing interlaced video directly. For example, for 60Hz refresh displays: mobcal_ter shrinks by 32.12%, shields_ter by 25.06% and Stockholm_ter by 39.83%. For 50Hz refresh: crowd_run shrinks by 16.67%, schumacher by 9.47%, ducks_take_off by 5.98%, and old_town_cross by 51.53%. The original input fields are always passed unchanged to the deinterlaced output frames. Similar average bitrate reduction has been found for HEVC. This is a breakthrough achievement in deinterlacing quality!
Demeler can be used to eliminate interlaced archives. There is no longer a need to ever keep the original interlaced material after it has been Demeler-deinterlaced to frames. LFFPT means that the original interlaced clip, if losslessly compressed, can then be exactly reconstructed (with no added noise) using meler. This makes demeler deinterlaced output ideal for archiving purposes, as its results can be re-interlaced and re-deinterlaced with an even better deinterlacer - should such technology ever become available. Recovery is also possible with lossy compression, commensurate with its quality and SNR, as discussed above. Demeler output usually compresses smaller than interlaced, so it saves storage for lossy archiving too!
Inverse telecine removes pulldown from 60i, converting exactly
to the original 24p. In the real world, either noise (from compression or from analog sources) or broken
2:3 cadences (due to edited scene changes after telecine was applied),
can make reliable pulldown very difficult to achieve when examined frame-by-frame.
Demeler uses advanced statistical techniques and motion-based scene-change detection to
achieve excellent quality under all commonly encountered operating conditions.
Progressive Segmented Frames (PSF) in interlace/telecine video are automatically detected in normal operation, and preserved at the output. For example, if normal 60i -> 60p deinterlacing detects the input frames are progressive, then each progressive output frame is preserved and duplicated to maintain the same 30p -> 60p output cadence. PSF detection is particularly important in 50i countries, where film is normally sped up to 25p and then inserted as progressive frames. Demeler can reverse the process and detect/convert either 50i or 25p to 50p.
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