DOCTOR WHO (2005) - Special Episode no. 154
"Twice Upon a Time"
This is the 2017 Christmas Special. It follows Season 10 and precedes Season 11.
Two Doctors stranded in a forbidding snowscape, refusing
to face regeneration. A British army captain, seemingly
destined to die in the First World War but taken from the
trenches to play his part in the Doctor's story. In the
final chapter of the Twelfth Doctor's epic adventure, he
must face his past to decide his future. Along the way he
realises the resilience of humanity, discovering hope in
his darkest frozen moment. It is the end of an era, but
the Doctor's journey is only just beginning.
Code:
Episode | Length | Size | Q:Avg | Q:75% | Q:25% | Q:01%
--------+---------+-------+-------+-------+-------+------
S00E154 | 59:54 | 563M | 94.66 | 95.66 | 93.14 | 83.42
Total runtime: 59m 54s - Total size: 562.7 MiB
VIDEO: AV1, 10 bit color
AUDIO: English 5.1 Opus @ 192 kbps
SUBS: English SRT (embedded)
The further adventures in time and space of the alien
adventurer known as the Doctor and their companions from
planet Earth.
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ENCODING PARAMS (AOMENC):
--cpu-used=4 --end-usage=q --tile-columns=1 --tile-rows=1
--bit-depth=10 --lag-in-frames=48 --threads=2
--enable-dist-wtd-comp=0 --enable-qm=1 --quant-b-adapt=3
--mv-cost-upd-freq=2 --enable-chroma-deltaq=1
--enable-fwd-kf=1
ENCODING PARAMS (AV1AN):
-p 2 --target_quality 94 --vmaf_plots --vmaf --probes 5
-a " -c:a libopus -b:a 192k -ac 6 " --min_q 15 --max_q 50
-xs 0
target_quality may be increased and/or min_q lowered for
individual episodes and/or segments of episodes if an
encode done with these parameters fails to meet quality
requirements.
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All Paarthurnax torrents are encoded in the AV1 video and
Opus audio codecs. This is a modern codec that offers the
best possible compression at any given quality level. Not
all media players support this format. If in doubt: VLC!
AV1-encoded files are usually around 30% smaller than
HEVC x265, and 50% smaller than AVC x264, at the same
quality.
The table above shows quality at mean, 75th, 25th and 1st
percentiles of frames, using Netflix's VMAF perceived
quality algorithm. Improvement above 93 is considered
imperceptible for film contents. All of our torrents
target a mean VMAF around 94 and 25th percentile no lower
than 91. This can be done while maintaining as small of a
file size as possible by splitting the video and encoding
the segments at a quality that is perfectly optimized for
each individual segment.
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