zombie_transcoding_scripts/README.md

zombie_transcoding_scripts
==========================

scripts that i might need later for transcoding

Common Transcoding commands
---------------------------

```
penis
```

### Transcode input to av1 and transcode the audio aswell (used for teen titans)
```
#!/bin/bash
#script written by logan but typed by zombie
#optimezed for teentitans
for i in *mkv; do
	av1an -i "$i" -o av1/"$(basename "$i")" -e aom -c mkvmerge --passes=2 -v "--threads=2 --cpu-used=5 --end-usage=q --cq-level=24 --enable-fwd-kf=1 --aq-mode=1 --lag-in-frames=48 --bit-depth=10 --kf-max-dist=240 --kf-min-dist=12 --enable-qm=1 --sb-size=64 --enable-keyframe-filtering=2 --arnr-strength=2 --arnr-maxframes=3 --sharpness=1 --enable-dnl-denoising=0 --denoise-noise-level=5" -a "-c:a libopus -b:a:0 128k -af aformat=channel_layouts='7.1|5.1|stereo'" --chunk-order random -m lsmash -r
done
```
For the file in question, all audio tracks will be transcoded. It may be useful to delete unnecessary tracks before transcoding. For example, in the case of Teen Titans, there was a lossless and a lossy track. I wanted to keep just the lossless track so i did:
```
for i in *mkv; do mkvmerge -o "$(basename "$i").balls" --audio-tracks 1 "$i"; done
```
to delete the unwanted tracks
you can use the `mkvinfo` command to get the track you want to remove

#### this one doesnt transcode the audio
```
#!/bin/bash
#script written by logan but typed by zombie

for i in *mkv; do
	av1an -i "$i" -o av1/"$(basename "$i")" -e aom -c mkvmerge --passes=2 -v "--threads=2 --cpu-used=5 --end-usage=q --cq-level=24 --enable-fwd-kf=1 --aq-mode=1 --lag-in-frames=48 --bit-depth=10 --kf-max-dist=240 --kf-min-dist=12 --enable-qm=1 --sb-size=64 --enable-keyframe-filtering=2 --arnr-strength=2 --arnr-maxframes=3 --sharpness=1 --enable-dnl-denoising=0 --denoise-noise-level=5" --chunk-order random -m lsmash -r
done
```
the only difference between the one that does the audio and the one that doesnt is `-a "-c:a libopus -b:a:0 128k -af aformat=channel_layouts='7.1|5.1|stereo'"`

#### dvd unstupiding
for whatever reason av1an doesnt detect the (correct) framerate and it also doesnt detect the aspect ratio. So to fix the framerate add `fps=24000/1001` in the -v block. This is also assuming that the original dvd was supported to actualy be at 23.976 fps. You can check this by playing a dvd rip and looking at the ***estimated*** framerate. Some dvds are softtelecined ie they got 23.976 frames per second and some are hard telecined where they are 29.97 fps where they got stupid interlaced frames.

to fix the aspect ratio run this command on the transcoded av1 file av1an made
```
ffmpeg -i Invader\ Zim\ S01E02a.mkv -c copy -aspect 4:3 output.mkv
```
for whatever other mystical stupid reason the `-aspect` flag doesnt work in av1an, at least when i tried, so we have to do it after the av1an transcode.
and obviously change `4:3` to whatever aspect ratio the dvd normally is. Common aspect ratios, and the only ones that i know of, are 4:3 and 16:9
And even sometimes if you didnt do your cast your druidic ritual spell correctky -aspect wont copy the video over for who knows why so using the command `mkvmerge -o outputav1fix.mkv --aspect-ratio 0:16/9 output.mkv` might also work. just make sure to change the 0: to the video stream... or just choose random numbers and hope it works.

### Transcode input to h264 and not audio (classic zombie crap version for playing on phone)
```
# create the h264 directory if it doesn't already exist
mkdir -p h264

# loop through all .mkv files in the current directory
for file in *.mkv; do
  # run the ffmpeg command on the current file
  ffmpeg -i "$file" -s 960x540 -c:v libx264 -preset veryslow -crf 30 -c:a copy "h264/${file%.*}.mkv"
done
```
#### single file version
```
ffmpeg -i Teen\ Titans\ S04E11.mkv -s 960x540 -c:v libx264 -preset veryslow -crf 30 -c:a copy output540pveryslow30ep11kleiner.mkv
```

Common info commands
--------------------

### this gets the info of all the audio of the videos in the current dir and displays it neatly (is useful for finding problems with the audio)
```
for i in *.mkv; do mediainfo "$i" | grep -e "Complete name" -e "Video" -e "Audio" -e "channels" -e "Bit rate"; echo "-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=";  done
```