Update other projects & add FFmpeg page

Author: ButterscotchV

src/ffmpeg-notes.md

@@ -0,0 +1,170 @@
+---
+layout: layouts/page.njk
+title: FFmpeg Notes
+
+eleventyNavigation:
+  key: FFmpeg Notes
+  order: 4
+
+image: /img/avatar.png
+description: "Notes for FFmpeg that I've accumulated over time."
+---
+
+# {{ title }}
+
+Hi, these are Butterscotch's personal FFmpeg notes! These are just a bunch of personal notes I've made about using FFmpeg over the years, so it's not a proper guide or anything.
+
+## Useful links
+
+- <https://trac.ffmpeg.org/wiki/Encode/H.264>
+- <https://trac.ffmpeg.org/wiki/Encode/H.265>
+- <https://trac.ffmpeg.org/wiki/Encode/AV1>
+- <https://slhck.info/video/2017/02/24/crf-guide.html>
+- <https://ffmpeg.org/ffmpeg.html#Advanced-options>
+- <https://ffmpeg.org/ffmpeg-codecs.html>
+
+## CRF - Bitrate control
+
+The Constant Rate Factor (CRF) is the main control for quality and bitrate for most modern encoders. The CRF scale starts from 0 to some variable value (usually 51, check for each encoder), where 0 is the highest quality (lossless) and the highest number is the lowest quality.
+
+### H264
+
+The CRF scale is 0-51, where 0 is lossless, 23 is the default, and 51 is the worst quality possible. A lower value generally leads to higher quality, and a subjectively sane range is 17-28. Consider 17 or 18 to be visually lossless or nearly so; it should look the same or nearly the same as the input but it isn't technically lossless.
+
+Note: The maximum value can change with 10-bit encoding.
+
+### H265
+
+The CRF scale is 0-51, where 0 is lossless, 28 is the default, and 51 is the worst quality possible. This scale is pretty much the same as H264 but can have higher quality at higher CRF values.
+
+### SVT-AV1
+
+The valid CRF value range for libsvtav1 is 0-63, with the default being 35. Lower values correspond to higher quality and greater file size. Lossless encoding is currently ​not supported. It is generally recommended to use preset 5/6 at CRF 24-28 for the best quality results.
+
+## Basic info commands
+
+### List hardware acceleration options
+
+```bash
+ffmpeg -hwaccels
+```
+
+### List codecs/encoders/decoders
+
+```bash
+ffmpeg -codecs
+ffmpeg -encoders
+ffmpeg -decoders
+```
+
+## Hardware acceleration
+
+- `hwaccel` is the input hardware acceleration
+- `hwaccel_output_format` is the output hardware acceleration
+
+## Example commands
+
+### Basic H265
+
+```bash
+ffmpeg -i input.mp4 -map 0 -c:v libx265 -crf 28 -c:a copy output.mp4
+```
+
+### Basic SVT-AV1
+
+#### Important options
+
+- `-preset 6` - A good SVT-AV1 encoding preset
+- `-crf 27` - Good value trade-off between quality and size
+- `-pix_fmt yuv420p10le` - 10-bit encoding, reduces colour banding, optional
+
+#### High quality
+
+```bash
+ffmpeg -i input.mp4 -map 0 -c:v libsvtav1 -preset 6 -crf 27 -pix_fmt yuv420p10le -c:a copy output.mp4
+```
+
+#### Medium quality
+
+```bash
+ffmpeg -i input.mp4 -map 0 -c:v libsvtav1 -preset 6 -crf 35 -pix_fmt yuv420p10le -c:a copy output.mp4
+```
+
+#### Low quality
+
+```bash
+ffmpeg -i input.mp4 -map 0 -c:v libsvtav1 -preset 6 -crf 51 -pix_fmt yuv420p10le -c:a copy output.mp4
+```
+
+### Copy embedded subtitles from MP4 to MP4
+
+```bash
+ffmpeg -i input.mp4 -map 0 -c:v copy -c:a copy -c:s mov_text output.mp4
+```
+
+### Encode video using CUDA (NVIDIA)
+
+```bash
+ffmpeg -init_hw_device cuda=hw -filter_hw_device hw -hwaccel cuda -hwaccel_output_format cuda -i input.mp4 -map 0 -c:v h264_nvenc -c:a copy output.mp4
+```
+
+### Encode video using QuickSync (Intel) with embedded subtitles
+
+```bash
+ffmpeg -init_hw_device qsv=hw -filter_hw_device hw -hwaccel qsv -hwaccel_output_format qsv -i input.mp4 -map 0 -c:v h264_qsv -c:a copy -c:s mov_text output.mp4
+```
+
+### Encode video using Vulkan/AMF (AMD)
+
+```bash
+ffmpeg -init_hw_device vulkan=hw -filter_hw_device hw -hwaccel vulkan -hwaccel_output_format vulkan -i input.mp4 -map 0 -c:v h264_amf -c:a copy output.mp4
+```
+
+### Resize video using letterbox
+
+```bash
+ffmpeg -i input.mp4 -map 0 -vf "scale=1920:1080:force_original_aspect_ratio=decrease,pad=1920:1080:-1:-1:color=black" output.mp4
+```
+
+### Batch encode
+
+Bulk conversion using Windows batch scripting. Should probably use something better like PowerShell
+
+```bat
+FOR /F "tokens=*" %G IN ('dir /b *.mp3') DO ffmpeg -i "%G" -b:a 48k "%~nG.opus"
+```
+
+### Video to high quality GIF
+
+```bash
+ffmpeg -i input.mp4 -vf "split[s0][s1];[s0]palettegen[p];[s1][p]paletteuse" -loop 0 output.gif
+```
+
+### Join two audio streams
+
+See:
+
+- <https://ffmpeg.org/ffmpeg-filters.html#amix>
+- <https://gist.github.com/LukasKnuth/4d7ee6812ccb221b2775e984516b56d4>
+
+```bash
+ffmpeg -i input.mp4 -map 0 -filter_complex amix=inputs=2 output.mp4
+```
+
+### Images to GIF at 50 FPS from 60 FPS
+
+```bash
+ffmpeg -r 60 -i image_%003d.jpg -vf "fps=50" out.gif
+```
+
+### Image and audio to video
+
+```bash
+ffmpeg -i image.jpg -i audio.wav -tune stillimage -shortest out.mp4
+```
+
+### Combine audio and video
+
+```bash
+ffmpeg -i video.webm -i audio.webm -map 0:v:0 -map 1:a:0 -c:v copy -c:a copy out.webm
+```

src/other-projects.md

@@ -22,7 +22,7 @@ Bingus Search is a passion project of mine to assist with technical support, hel
 
 ## [SlimeVR Firmware Tool](https://slimevr-firmware.bscotch.ca/)
 
-I host a fork of the SlimeVR Firmware Tool for people to use as the original is no longer hosted or maintained. There is a version being developed to be integrated within the SlimeVR software, but as of writing, it is not yet released.
+I host a fork of the SlimeVR Firmware Tool for people to use as the original is no longer hosted or maintained. There is a version integrated within the SlimeVR software which I highly recommend using instead.
 
 ## [SlimeVR Testing Checklist](https://slimevr-testing.bscotch.ca/)