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parameters.md
268
parameters.md
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# Encoding Configuration Parameters
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This document details the configuration parameters used across the AomEnc and SVT-AV1 encoding scripts.
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## Audio Demuxing & Downmixing
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The audio processing extracts streams using `ffmpeg` and automatically downmixes surround layouts to stereo if requested.
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### Downmixing Parameters
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- **5.1 Channel Layouts (6 channels)**
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```text
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-af "pan=stereo|c0=c2+0.30*c0+0.30*c4|c1=c2+0.30*c1+0.30*c5"
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```
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- **7.1 Channel Layouts (8 channels)**
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```text
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-af "pan=stereo|c0=c2+0.30*c0+0.30*c4+0.30*c6|c1=c2+0.30*c1+0.30*c5+0.30*c7"
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```
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### Non-Downmixed Encoding Bitrates (Opus)
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When preserving the original channel layout (no downmixing) or if the source is already stereo/mono, audio is encoded with the following bitrates based on channel count:
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- **Mono (1 channel)**: `64k`
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- **Stereo (2 channels)**: `128k`
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- **5.1 Surround (6 channels)**: `256k`
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- **7.1 Surround (8 channels)**: `384k`
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- **Other/Uncommon Layouts**: `192k` (fallback default)
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## VFR to CFR Conversion
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To handle Variable Frame Rate (VFR) sources reliably on UTVideo intermediate generation, `HandBrakeCLI` is used to convert them to Constant Frame Rate (CFR) before processing.
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The exact HandBrakeCLI arguments used:
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```text
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HandBrakeCLI \
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--input <source_file> \
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--output <intermediate_cfr_file> \
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--cfr \
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--rate <target_cfr_fps> \
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--encoder x264_10bit \
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--quality 0 \
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--encoder-preset superfast \
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--encoder-tune fastdecode \
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--audio none \
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--subtitle none \
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--crop-mode none
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```
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## Encoder-Specific Parameters
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### AomEnc (aom-psy101)
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> **Special Version Repository**: [https://gitlab.com/damian101/aom-psy101](https://gitlab.com/damian101/aom-psy101)
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Parameters parsed to the `aom` encoder:
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```text
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--bit-depth=10 \
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--cpu-used=2 \
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--end-usage=q \
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--cq-level=<crf_value> \
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--min-q=6 \
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--threads=2 \
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--tune-content=psy \
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--frame-parallel=1 \
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--tile-columns=1 \
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--gf-max-pyr-height=4 \
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--deltaq-mode=2 \
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--enable-keyframe-filtering=0 \
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--disable-kf \
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--enable-fwd-kf=0 \
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--kf-max-dist=9999 \
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--sb-size=dynamic \
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--enable-chroma-deltaq=1 \
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--enable-qm=1 \
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--color-primaries=bt709 \
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--transfer-characteristics=bt709 \
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--matrix-coefficients=bt709
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```
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*(Note: `--cq-level` dynamically defaults to `28` but can be overwritten when executing the script via the `--crf` argument).*
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### SVT-AV1 (SVT-AV1-Essential)
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> **Special Version Repository**: [https://github.com/nekotrix/SVT-AV1-Essential/](https://github.com/nekotrix/SVT-AV1-Essential/)
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Parameters initialized for the `svt-av1` encoder:
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```text
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--speed slower \
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--quality medium \
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--film-grain <grain_value> \
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--color-primaries 1 \
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--transfer-characteristics 1 \
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--matrix-coefficients 1 \
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--scd 0 \
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--keyint 0 \
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--lp 2 \
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--auto-tiling 1 \
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--tune 1 \
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--progress 2
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```
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*(Note: Parameters such as `--speed`, `--quality`, and `--film-grain` can be overridden when executing the script).*
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## av1an Initiation Commands
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### AomEnc
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Arguments used to start `av1an` using the AomEnc encoder:
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```text
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av1an -i <vpy_script> -o <encoded_mkv> -n \
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-e aom \
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--photon-noise <grain> \
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--resume \
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--sc-pix-format yuv420p \
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-c mkvmerge \
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--set-thread-affinity 2 \
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--pix-format yuv420p10le \
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--force \
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--no-defaults \
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-w <calculated_workers> \
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--passes 2 \
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-v "<aom_encoder_parameters_above>"
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```
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### SVT-AV1
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Arguments used to start `av1an` using the SVT-AV1 encoder:
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```text
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av1an -i <vpy_script> -o <encoded_mkv> -n \
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-e svt-av1 \
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--resume \
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--sc-pix-format yuv420p \
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-c mkvmerge \
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--set-thread-affinity 2 \
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--pix-format yuv420p10le \
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--force \
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--no-defaults \
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-w <calculated_workers> \
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-v "<svt_av1_encoder_parameters_above>"
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```
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# Encoding Configuration Parameters
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This document details the configuration parameters used across the AomEnc and SVT-AV1 encoding scripts.
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## Audio Demuxing & Downmixing
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The audio processing extracts streams using `ffmpeg` and automatically downmixes surround layouts to stereo if requested.
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### Downmixing Parameters
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- **5.1 Channel Layouts (6 channels)**
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```text
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-af "pan=stereo|c0=c2+0.30*c0+0.30*c4|c1=c2+0.30*c1+0.30*c5"
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```
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- **7.1 Channel Layouts (8 channels)**
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```text
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-af "pan=stereo|c0=c2+0.30*c0+0.30*c4+0.30*c6|c1=c2+0.30*c1+0.30*c5+0.30*c7"
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```
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### Non-Downmixed Encoding Bitrates (Opus)
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When preserving the original channel layout (no downmixing) or if the source is already stereo/mono, audio is encoded with the following bitrates based on channel count:
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- **Mono (1 channel)**: `64k`
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- **Stereo (2 channels)**: `128k`
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- **5.1 Surround (6 channels)**: `256k`
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- **7.1 Surround (8 channels)**: `384k`
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- **Other/Uncommon Layouts**: `192k` (fallback default)
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## VFR to CFR Conversion
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To handle Variable Frame Rate (VFR) sources reliably on UTVideo intermediate generation, `HandBrakeCLI` is used to convert them to Constant Frame Rate (CFR) before processing.
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The exact HandBrakeCLI arguments used:
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```text
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HandBrakeCLI \
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--input <source_file> \
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--output <intermediate_cfr_file> \
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--cfr \
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--rate <target_cfr_fps> \
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--encoder x264_10bit \
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--quality 0 \
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--encoder-preset superfast \
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--encoder-tune fastdecode \
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--audio none \
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--subtitle none \
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--crop-mode none
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```
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## Encoder-Specific Parameters
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### AomEnc (aom-psy101)
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> **Special Version Repository**: [https://gitlab.com/damian101/aom-psy101](https://gitlab.com/damian101/aom-psy101)
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Parameters parsed to the `aom` encoder:
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```text
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--bit-depth=10 \
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--cpu-used=2 \
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--end-usage=q \
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--cq-level=<crf_value> \
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--min-q=12 \
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--threads=2 \
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--tune-content=psy \
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--frame-parallel=1 \
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--tile-columns=1 \
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--gf-max-pyr-height=4 \
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--deltaq-mode=2 \
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--enable-keyframe-filtering=0 \
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--disable-kf \
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--enable-fwd-kf=0 \
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--kf-max-dist=9999 \
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--sb-size=dynamic \
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--enable-chroma-deltaq=1 \
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--enable-qm=1 \
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--color-primaries=bt709 \
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--transfer-characteristics=bt709 \
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--matrix-coefficients=bt709
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```
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*(Note: `--cq-level` dynamically defaults to `28` but can be overwritten when executing the script via the `--crf` argument).*
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### SVT-AV1 (SVT-AV1-Essential)
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> **Special Version Repository**: [https://github.com/nekotrix/SVT-AV1-Essential/](https://github.com/nekotrix/SVT-AV1-Essential/)
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Parameters initialized for the `svt-av1` encoder:
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```text
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--speed slower \
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--quality medium \
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--film-grain <grain_value> \
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--color-primaries 1 \
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--transfer-characteristics 1 \
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--matrix-coefficients 1 \
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--scd 0 \
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--keyint 0 \
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--lp 2 \
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--auto-tiling 1 \
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--tune 1 \
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--progress 2
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```
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*(Note: Parameters such as `--speed`, `--quality`, and `--film-grain` can be overridden when executing the script).*
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## av1an Initiation Commands
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### AomEnc
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Arguments used to start `av1an` using the AomEnc encoder:
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```text
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av1an -i <vpy_script> -o <encoded_mkv> -n \
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-e aom \
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--photon-noise <grain> \
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--resume \
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--sc-pix-format yuv420p \
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-c mkvmerge \
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--set-thread-affinity 2 \
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--pix-format yuv420p10le \
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--force \
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--no-defaults \
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-w <calculated_workers> \
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--passes 2 \
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-v "<aom_encoder_parameters_above>"
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```
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### SVT-AV1
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Arguments used to start `av1an` using the SVT-AV1 encoder:
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```text
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av1an -i <vpy_script> -o <encoded_mkv> -n \
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-e svt-av1 \
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--resume \
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--sc-pix-format yuv420p \
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-c mkvmerge \
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--set-thread-affinity 2 \
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--pix-format yuv420p10le \
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--force \
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--no-defaults \
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-w <calculated_workers> \
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-v "<svt_av1_encoder_parameters_above>"
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```
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