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--- dvd_trip [2021/10/17 23:43] – [dvd_trip] beandog
+++ dvd_trip [2023/12/26 08:50] (current) – removed beandog
@@ Line 1: / Line 1: @@
-====== dvd_trip ======
-''dvd_trip'' is a tiny DVD ripper that is part of [[https://github.com/beandog/dvd_info|dvd_info]]. It is tiny because it has a subset of major DVD ripper options.
-==== Features ====
-I originally wrote it as a proof-of-concept and a way to use libmpv's backend for coding. It's good to use if you want to see what a DVD track would look like with some generic settings for encoding, a quick way to get in and out. If you like the way it works, awesome. :)
-What it does:
-  * requires no arguments, will rip the longest track to ''trip_encode.mkv'' by default
-  * rips the video track plus one audio track
-  * can select audio track by language or track id
-  * one fixed output based on output filename extension
-  * .mkv - H.265 (x265) AAC (fdk-aac)
-  * .mp4 - H.264 (x264) AAC (fdk-aac)
-  * .webm - VPX9 Opus
-  * detelecining
-What it does not do:
-  * subtitles
-  * multiple audio streams
-  * auto-cropping
-  * add specific codec parameters
-  * pass video or audio through
-I recommend using something like [[HandBrake]] for more advanced options.
-==== x265 Encoding ====
-CRF for x265 ranges from 0 to 51, with the default being 28.
-In x265, changing the encoder speed is relative to filesize, not quality. In these presets, however, both CRF and encoding speed are adjusted for each level.
-==== x264 Encoding ====
-CRF for x264 ranges from 0 to 51, with the default being 23.
-In x264, changing the encoder speed is relative to quality, not filesize. In these presets, however, both CRF and encoding speed are adjusted for each level.
-==== VPX Encoding ====
-The WebM project recommends doing a two-pass encode as the default options for creating video. I prefer doing a one-pass with a good CRF instead, and that is what's used here.
-VPX doesn't have a 'CRF' in the same sense that x264 and x265 do. Instead, you can set minimum and maximum quality scale levels. The lowest being 0, and the highest 63 (rc_min_quantizer and rc_max_quantizer).
-The values cannot be set to each other in an attempt to "force" a specific quality level. The library requires that there be a minimium difference of 8 between the two values.
-In addition to setting the ranges, the rate control method is set to 'quality'. The other options being VBR, CBR, and constrained quality.
-The default settings using libvpx as a one-pass, with no quality scales set is generally low-quality, with lots of blockiness, and so is used for the "low" preset. Depending on your source, you may or may not get a good encode out of it, but setting it to defaults means you could get anything. The other presets set a minimum quality level.
-Using vpxenc, here is what the settings would look like for the low preset:
-<code>
-vpxenc --end-usage=q --passes=1 --webm -o vpxenc.webm source.y4m
-</code>

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