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| - | ====== 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. | ||
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| - | |||
| - | ==== 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. | ||
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| - | 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). | ||
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| - | 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. | ||
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| - | In addition to setting the ranges, the rate control method is set to 'quality'. The other options being VBR, CBR, and constrained quality. | ||
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| - | 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> | ||
