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---GENERAL----
Size...........: 64.2 GiB
Container......: Matroska
Duration.......: 01:41:45.547

---VIDEO----
Codec..........: HEVC, Dolby Vision, Version 1.0, Profile 7.6, dvhe.07.06, BL+EL+RPU, no metadata compression, Blu-ray compatible / SMPTE ST 2086, Version HDR10, HDR10 compatible, PQ
Resolution.....: 3840x2160
Bit rate.......: 89.3 Mb/s
Frame rate.....: 24.000 fps

---AUDIO----
Format.........: FLAC
Channels.......: 1 channel
Sample rate....: 48.0 kHz
Bit rate.......: 362 kb/s
Language.......: Czech (Restored)

---AUDIO----
Format.........: FLAC
Channels.......: 1 channel
Sample rate....: 48.0 kHz
Bit rate.......: 231 kb/s
Language.......: Czech (Unrestored)

---AUDIO----
Format.........: Dolby Digital
Channels.......: 2 channels
Sample rate....: 48.0 kHz
Bit rate.......: 256 kb/s
Language.......: English (Commentary by film programmer/curator Irena Kovarova and film scholar Peter Hames)

---SUBTITLES---
Language.......: English (GB) (British), UTF-8
Language.......: English (GB) (British / PGS), PGS
Language.......: English (US) (American), UTF-8
Language.......: English (US) (American / PGS), PGS
Language.......: Czech (SDH), PGS
Language.......: German, PGS

Sources
#1: Deaf Crocodile USA UHD Blu-ray (video, audio, subtitles)
#2: Filmexport Home Video PAL DVD (alt. audio, chapters)
#3: National Film Archive CZE Blu-ray (subtitles)
#4: Studio Hamburg Enterprises GER Blu-ray (subtitles)

Video
Krakatit was restored by the Czech National Film Archive in 2016. For this release, Deaf Crocodile regraded the film in Dolby Vision HDR.

Audio
The 2016 restoration's audio track sounds quite good in my opinion, despite being fairly heavy-handed with noise reduction and EQ. Particularly, the bass seems to be enhanced beyond the capabilities of a 1948 optical element. The older DVD track appears to be unrestored and sounds a lot more in line with what I would expect an untouched transfer of a film of this vintage to sound like, so I included it as an alternate option. The opening music sounds significantly more natural on the unrestored track, but I prefer the new restoration for the rest of the film.

For the restored track, I opted to use audio from the USA disc. CZE used extraneous filtering and has incorrect pitch; GER is 16-bit, runs at a different frame rate, and appears to have unnaturally extended peaks (though no audible difference, unlike CZE). As USA had a really low audio volume, to bring it in-line with the other two tracks, I applied 12 dB of gain by applying a shift of 2 bits upwards. This process is fully reversible — applying a shift of -2 bits will result in a file bit-exact to the source (left channel only, as the original track is dual mono). The resulting track uses 22 bits.


Subtitles
The translation is identical on both CZE and USA discs, but with UK/US spelling differences, so kept both. Corrected formatting in the SRT versions (inserted proper line breaks before speaker dashes, rather than breaking in the middle of the first sentence), and a typo in the US version.