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ball is a vim swp file i gotta fix it later
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zombie maniac 2023-07-23 04:43:14 -04:00
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This script transcodes the audio to opus and changes the bitrate according to how many channels the audio has
==========================
scripts that i might need later for transcoding
Common Transcoding commands
---------------------------
### Transcode input to av1 and transcode the audio to opus with bitrate correction (used for eureka)
```
#!/bin/bash
#script written by logan but typed by zombie
#optimezed for teentitans
for i in *mkv; do
av1an -i "$i" -o av1/"$(basename "$i")" -e aom -c mkvmerge --passes=2 -v "--threads=2 --cpu-used=5 --end-usage=q --cq-level=24 --enable-fwd-kf=1 --aq-mode=1 --lag-in-frames=48 --bit-depth=10 --kf-max-dist=240 --kf-min-dist=12 --enable-qm=1 --sb-size=64 --enable-keyframe-filtering=2 --arnr-strength=2 --arnr-maxframes=3 --sharpness=1 --enable-dnl-denoising=0 --denoise-noise-level=5" -a "-c:a libopus -b:a:0 128k -af aformat=channel_layouts='7.1|5.1|stereo'" --chunk-order random -m lsmash -r
done
```
For the file in question, all audio tracks will be transcoded to opus. It may be useful to delete unnecessary tracks before transcoding. For example, in the case of Eureka, there were multiple tracks with different channel layouts, one that opus doesnt really support so you might as well delete the one that opus doesnt support, but it still will transcode.
```
for i in *mkv; do mkvmerge -o "$(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

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This script transcodes the audio to opus and changes the bitrate according to how many channels the audio has
==========================
scripts that i might need later for transcoding
Common Transcoding commands
---------------------------
### Transcode input to av1 and transcode the audio to opus with bitrate correction (used for eureka)
```
#!/bin/bash
# Set bitrate for different channels
BITRATE_1CHANNEL="64k"
BITRATE_2CHANNEL="135k"
BITRATE_6CHANNEL="265k"
# Temporary directory for converted tracks
tmpdir=$(mktemp -d)
outputdir=av1/
mkdir -p $outputdir
echo "Temp dir $tmpdir"
echo "tmpdir\/file $tmpdir/$file"
echo "output dir $outputdir/$(basename "$file")"
ulimit -n 10000
for file in *.mkv; do
# Check if the file has already been processed
if [ -f "$outputdir/$(basename "$file")" ]; then
echo "$file has already been transcoded, skipping..."
continue
fi
###############################################################################
# audio wizard magic! #
# wont work on truehd or dolby atmos or anything with more than 6 channels :( #
###############################################################################
n_tracks=$(ffprobe -loglevel error -show_streams "$file" | grep -c 'codec_type=audio')
# Transcode each audio track to Opus
input_files=(-i "$file")
map_args=(-map 0:v -map 0:s -c:v copy -c:s copy)
for ((i=0;i<$n_tracks;i++)); do
n_channels=$(ffprobe -loglevel error -show_streams -select_streams a:"$i" "$file" | grep 'channels=' | cut -f2 -d=)
output="$tmpdir/${file%.mkv}_track$i.opus"
# Choose bitrate based on number of channels
case "$n_channels" in
1) bitrate="$BITRATE_1CHANNEL";;
2) bitrate="$BITRATE_2CHANNEL";;
6) bitrate="$BITRATE_6CHANNEL";;
*) echo "Unsupported channel number: $n_channels"; continue ;;
esac
echo "Transcoding audio track $i from $file ($n_channels channels) to Opus ($bitrate)..."
if [ "$n_channels" -eq 6 ]; then
ffmpeg -loglevel error -i "$file" -map 0:a:$i -af "channelmap=channel_layout=5.1" -c:a libopus -b:a "$bitrate" -mapping_family 1 "$output"
else
ffmpeg -loglevel error -i "$file" -map 0:a:$i -c:a libopus -b:a "$bitrate" "$output"
fi
input_files+=(-i "$output")
map_args+=(-map $((i+1)):a -c:a:$(($i)) copy)
done
# Merge the transcoded audio tracks, original video track, and original subtitle track back into an MKV file
ffmpeg -loglevel error "${input_files[@]}" "${map_args[@]}" "$tmpdir/$file"
############################
# av1an #
############################
echo "Audio done! AV1 Time!"
echo "tmpdir\/file $tmpdir/$file"
echo "output dir $outputdir/$(basename "$file")"
av1an -i "$tmpdir/$file" -o "$outputdir/$(basename "$file")" -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
# Clean up the temporary directory
rm -r "$tmpdir"
```
For the file in question, all audio tracks will be transcoded to opus. It may be useful to delete unnecessary tracks before transcoding. For example, in the case of Eureka, there were multiple tracks with different channel layouts, one that opus doesnt really support so you might as well delete the one that opus doesnt support, but it still will transcode.
```
for i in *mkv; do mkvmerge -o "$(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

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Neat comparison commands
------------------------
this command will take a input video and transcode it for every crf value in a range
crfleveltest.sh
```
#!/bin/bash
for i in {0..63}
do
echo da real time bro $i >> timetime
date >> timetime
ffmpeg -i originalencoding.mkv -c:a copy -c:v libsvtav1 -preset 8 -crf $i svtav1/crftest/svtav1_$i.mkv
#echo \n >> timetime
done
```
this will take a specific frame out off all the videos in a folder which is useful for comparing the crf values on a specific frame
frameextractor.sh
```
#!/bin/bash
output_directory="png"
for video in *mkv; do
filename=$(basename -- "$video")
filename_no_ext="${filename%.*}"
ffmpeg -ss 00:00:10 -i "$video" -vframes 1 "$output_directory/$filename_no_ext.png"
done
```
this will take all the file names of the pngs and put them into subtitles so you cam see what video (crf value typically) the current frame was from
subtitles.py
```
import os
# Assuming files are in the current directory.
# Modify this path to the location of your PNG files if needed.
files = sorted([f for f in os.listdir('.') if f.endswith('.png')])
# Start time for each subtitle in seconds
start_time = 0.0
# The duration each subtitle is displayed for in seconds
duration = 0.1
with open('subtitles.srt', 'w') as f:
for i, filename in enumerate(files, start=1):
# Format start and end times
start_h = int(start_time // 3600)
start_m = int((start_time % 3600) // 60)
start_s = int(start_time % 60)
start_ms = int(round((start_time % 1) * 1000))
start = "{:02d}:{:02d}:{:02d},{:03d}".format(start_h, start_m, start_s, start_ms)
end_time = start_time + duration
end_h = int(end_time // 3600)
end_m = int((end_time % 3600) // 60)
end_s = int(end_time % 60)
end_ms = int(round((end_time % 1) * 1000))
end = "{:02d}:{:02d}:{:02d},{:03d}".format(end_h, end_m, end_s, end_ms)
# Write subtitle entry
f.write(f"{i}\n{start} --> {end}\n{filename}\n\n")
# Update start time for next subtitle
start_time += duration
```
this will combine all the pngs and subtitles to a video to be watched just make sure the framerates match between this command and rhe ones specified in the subtitle command
pngcombiner
```
ffmpeg -framerate 10 -i svtav1_%02d.png -i subtitles.srt -c:v libx264 -crf 10 output.mkv
```