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Targets
The other-transcode.rb tool targets a specific video bitrate, rather than a fixed quality level, using an average bitrate (ABR) ratecontrol system. That target is selected automatically based upon the resolution of the input video and any scaling applied to the output. When HEVC encoding is used, all resolution-specific default targets are lowered by one third:
| Resolution | H.264 | HEVC |
|---|---|---|
| 1080p (Blu-ray video) | 6000 Kbps | 4000 Kbps |
| 720p | 3000 Kbps | 2000 Kbps |
| 480p (DVD video) | 1500 Kbps | 1000 Kbps |
Testing has shown that these default target video bitrates provide transparency when using hardware encoders, meaning that the transcoded output is high enough quality to be mistaken for the originals.
But different targets for some inputs might might be preferable, so the --target option is available to override the default:
other-transcode.rb --target 5000 C:\Rips\Movie.mkv
The scope of a custom target can even be restricted to a specific input resolution:
other-transcode.rb --target 1080p=5000 C:\Rips\Movie.mkv
Or more than one resolution for multiple inputs:
other-transcode.rb --target 1080p=5000 --target 480p=1250 C:\Rips\*.mkv