add documentation for Doom game formats and FFmpeg usage examples

FullByte · Jan 21, 2025 · 1bbcbb7 · 1bbcbb7
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diff --git a/docs/tech/art/games/doom.md b/docs/tech/art/games/doom.md
@@ -4,4 +4,10 @@ There are [plenty](https://doomwiki.org/wiki/Doom_on_legacy_systems) of [collect
 
 So this is just my list of favorite things that run doom or versions of doom.
 
-[Doom in a PDF](_doom.pdf)
+## PDF
+
+[Doom in a PDF](_doom.pdf) and the [Source](https://github.com/ading2210/doompdf)
+
+## Word
+
+[Doom in Word File](https://github.com/wojciech-graj/doom-docm)
diff --git a/docs/tech/cloud/azure/tools/vscode.md b/docs/tech/cloud/azure/tools/vscode.md
@@ -0,0 +1,16 @@
+# VScode
+
+The combination of [Github CoPilot](https://github.com/features/copilot) + [VScode](https://code.visualstudio.com/) + [GitHub Copilot for Azure](https://marketplace.visualstudio.com/items?itemName=ms-azuretools.vscode-azure-github-copilot) provides an interactive experience through the @azure chatbot, enabling developers to learn about Azure services, manage resources, diagnose issues, monitor costs, and utilize the Azure Developer CLI (azd).
+
+Here are some possible use cases:
+
+- Understanding Azure services like AI, compute, containers, databases, and security.
+- Comparing services (e.g., Azure Container Apps vs. Azure Kubernetes Service).
+- Fetching information on resources (e.g., URLs of web apps).
+- Summarizing resource usage and answering resource-specific queries.
+- Diagnosing problems with Azure services like API Management, Kubernetes, or Redis.
+- Summarizing logs for applications in services like Azure Container Apps.
+- Estimating and reviewing historical Azure costs.
+- Identifying the most expensive resources in a subscription.
+- Searching and deploying application templates.
+- Receiving step-by-step deployment guidance.
diff --git a/docs/tech/tools/cli/ffmpeg.md b/docs/tech/tools/cli/ffmpeg.md
@@ -38,6 +38,30 @@ Change the title of input.mp4 to "My Title"
 ffmpeg -i input.mp4 -map_metadata -1 -metadata title="My Title" -c:v copy -c:a copy output.mp4
 ```
 
+Get a list of audio/video/subtitle encoders
+
+``` sh
+ffmpeg -hide_banner -encoders
+```
+
+Get only audio encoders
+
+``` sh
+ffmpeg -hide_banner -encoders | grep "^ A"
+```
+
+Get only video encoders
+
+``` sh
+ffmpeg -hide_banner -encoders | grep "^ V"
+```
+
+Analyze video frames, timecode and metadata
+
+``` sh
+ffmpeg -i input.mp4 -vf showinfo -f null -
+```
+
 ## Download video streams
 
 Locate the playlist file, e.g. using Chrome > F12 > Network > Filter: m3u8
@@ -160,6 +184,20 @@ In this example by 3.14 seconds
 ffmpeg -i input.mp4 -itsoffset 3.14 -i in.mp4 -map 0:v -map 1:a -vcodec copy -acodec copy output.mp4
 ```
 
+## Stream Video
+
+### Stream local file to RTMP
+
+The command below takes an input.mp4 file and streams it over the [RTMP protocol](https://ffmpeg.org/ffmpeg-all.html#rtmp). The -listen 1 parameter instructs FFmpeg to wait for an incoming connection. Once a client, such as ffplay, VLC, or any RTMP-compatible video player, connects, FFmpeg begins transmitting the video frames over RTMP. The -c copy parameter ensures that FFmpeg streams the video without re-encoding, preserving the original size, bitrate, and encoding.
+
+``` sh
+# RTMP server
+ffmpeg -re -i input.mp4 -listen 1 -c copy -f flv rtmp://localhost/live
+
+# RTMP client
+ffplay rtmp://127.0.0.1/live
+```
+
 ## Manipulate Video
 
 ### Stack Videos in a Grid
@@ -199,6 +237,28 @@ For a 90 degrees rotation use one of the following options:
 - Example: ```ffmpeg -i input.mp4 -vf "transpose=1" output.mp4```
 - 180 degrees run this command: ```ffmpeg -i input.mp4 -vf "transpose=2,transpose=2 output.mp4"```
 
+## Draw with FFMPEG
+
+### Generate test video color pattern
+
+``` sh
+ffmpeg -f lavfi -i testsrc=duration=10:size=1280x720:rate=30 testsrc.mpg
+```
+
+### Generate Game of life
+
+Simple version:
+
+```sh
+ffmpeg -f lavfi -i life=size=640x480:rate=30 -frames:v 300 _ffmpeg_game_of_life1.mp4
+```
+
+Using colors:
+
+```sh
+ffmpeg -f lavfi -i "life=s=960x540:mold=10:r=60:ratio=0.1:death_color=#C83232:life_color=#00ff00,scale=960:540:flags=16" -c:v libx264 -crf 41 -frames:v 1800 -r 60 -t 30 _ffmpeg_game_of_life2.mp4
+```
+
 ## Video Stabilization
 
 Requires `libvidstab` additionally to ffmpeg
@@ -231,6 +291,18 @@ Then use [ffmpeg](https://trac.ffmpeg.org/wiki/Slideshow) [concat](https://ffmpe
 ffmpeg -f concat -i input.txt -vsync vfr -pix_fmt yuv420p output.mp4
 ```
 
+Alternatively create an animated WebP with numbered PNGs:
+
+``` sh
+ffmpeg -r 1 -i /%d.png -vcodec libwebp -pix_fmt yuv420p -loop 0 -r 1 output.webp
+```
+
+Or create a looping WebP animation with numbered PNGs:
+
+``` sh
+ffmpeg -i /%d.png -vcodec libwebp -pix_fmt yuv420p -loop 0 -s 720:720 -quality 50 output.webp
+```
+
 ## Resize Video
 
 - Smaller MP4 (with sound) e.g. for Messenger: ```ffmpeg -i input.mp4 -vf "scale=-2:480" -c:v libx264 -preset slow -crf 21 -profile:v baseline -level 3.0 -pix_fmt yuv420p -r 25 -g 50 -c:a aac -b:a 160k -r:a 44100 -f mp4 output.mp4```
@@ -275,6 +347,14 @@ Export all video frames as images
 ffmpeg -i "%1" frames/out-%03d.jpg
 ```
 
+Remove GoPro TimeCode from MP4
+
+The command `-write_tmcd 0` will ensure not to write the timecode to the output file
+
+``` sh
+ffmpeg -i input.mp4  -c:a copy -c:v copy -write_tmcd 0 output.mp4
+```
+
 ### VOB preparation
 
 To merge multiple VOB files simple run:
@@ -322,6 +402,3 @@ This uses `libmp3lame` with default settings. The script will convert all media
 ``` ps1
 Get-ChildItem -file -exclude *.mp3 | Foreach-Object { ffmpeg -i ('"' + $_.Name + '"') -map_metadata -1 -acodec libmp3lame ('"' + $_.BaseName + '.mp3"') }
 ```
-
-## Sort this
-
diff --git a/docs/tech/tools/cli/git.md b/docs/tech/tools/cli/git.md
@@ -10,6 +10,29 @@
 
 ![xkdc-git](_xkdc-git.png)
 
+```txt
++---------------------------------------------------------------+
+|      * * * PUSH REJECTED BY EVIL DRAGON BUREAUCRATS * * *     |
++---------------------------------------------------------------+
+             \
+              \                    ^    /^
+               \                  / \  // \
+                \   |\___/|      /   \//  .\
+                 \  /V  V  \__  /    //  | \ \           *----*
+                   /     /  \/_/    //   |  \  \          \   |
+                   @___@`    \/_   //    |   \   \         \/\ \
+                  0/0/|       \/_ //     |    \    \         \  \
+              0/0/0/0/|        \///      |     \     \       |  |
+           0/0/0/0/0/_|_ /   (  //       |      \     _\     |  /
+        0/0/0/0/0/0/`/,_ _ _/  ) ; -.    |    _ _\.-~       /   /
+                    ,-}        _      *-.|.-~-.           .~    ~
+  *     \__/         `/\      /                 ~-. _ .-~      /
+   \____(Oo)            *.   }            {                   /
+   (    (..)           .----~-.\        \-`                 .~
+   //___\\\\  \ DENIED!  ///.----..<        \             _ -~
+  //     \\\\                ///-._ _ _ _ _ _ _{^ - - - - ~
+```
+
 ## Tools and Helper
 
 - Github quick stats: <https://github.com/arzzen/git-quick-stats>