https://github.com/emrahcom/rating
https://github.com/emrahcom/rating
Last synced: 14 days ago
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- Host: GitHub
- URL: https://github.com/emrahcom/rating
- Owner: emrahcom
- Created: 2025-10-11T14:48:44.000Z (8 months ago)
- Default Branch: main
- Last Pushed: 2026-05-12T08:25:47.000Z (23 days ago)
- Last Synced: 2026-05-12T10:33:02.401Z (23 days ago)
- Language: Shell
- Size: 315 KB
- Stars: 0
- Watchers: 0
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
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README
# Rating
## Required packages
```bash
apt-get install imagemagick bc
```
## Source video
```bash
EPISODE=1
ffmpeg -ss 00:00:05.0 -i tbd-$EPISODE-raw.mp4 \
-vf "scale=1920:1080:flags=lanczos" -c:v libsvtav1 -movflags faststart \
-c:a copy -y tbd-$EPISODE-1080.mp4
```
## Source graph
- Graph is a chart prepared by LibreOffice Calc using the rating data.
- First, save as ODS, `minutes.ods`
- Copy the sheet as 'rating', don't update the original sheet.
- Don't remove the advertisement periods.
- Start ~10 min earlier (select an even minute)
- Stop after ~2 min (select an even minute)
- Create an empty sheet, `graph`
- Insert chart
- Line -> Lines only, Line type: smooth or straight
- Data series in columns.
- Display the legend at top
- Make full screen with even numbers in X axis.
- Put space between X axis and the bottom to make it visible all the time.
- Graph is captured by scrot while zooming (`ctrl+shift+j`) in Calc.
- Graph is a chart modified by GIMP.
- It should have the same resolution with the source video, `1920x1080`
- First, calculate PPS (pixel per second)
- X axis should be shifted to the left by 30 seconds since the value of point
is the average rating of the next minute.
- Start and end time with color `#0815ca` (delete and fill)
- Add advertisement periods by putting rectangle areas with color `#d9e303` on
a layer with `50%` transparency.
- Merge visible layers.
- Export
- Inverted color.
- Graph should be transparent, remove black area.
- Export as inverted.
## Parameters
- `GRAPH` is the path of PNG file.
- `X0` is the pixel coordinate for starting point on X axis. Use minus 1 pixel
because the vertical line's width is 2 pixels.
- `PPS` is the pixels per second.
- Select a long range such as from 21:00 to 24:00
- Get the pixel difference of these two points.
- Calculate the pixels per second.
`PPS = number_of_pixels / time_difference_as second`
- Check `PPS` line in script and put correct values to calculate it.
- `Y0` is the pixel coordinate for top point of the slider on Y axis.
- `Y1` is the pixel coordinate for bottom point of the slider on Y axis.
- `SECONDS` is the length of the video (MP4 file) in seconds.
- `FRAMERATE` is the number of frames per second (default 0.5).
- Set `BREAKS`.
## Generating frames
```bash
deno run --allow-run --allow-read --allow-write graph-to-video.ts
```
## Output Video
Watch `timer.mp4` before generating graph videos. Check if timer in graphic and
the actual timer match each others.
```bash
FRAMERATE=0.5
ffmpeg -r $FRAMERATE -i frames/%06d.png -vcodec h264 -y /tmp/timer.mp4
# Watch and check /tmp/timer.mp4
mpv /tmp/timer.mp4
ffmpeg -i source.mp4 -r $FRAMERATE -i frames/%06d.png \
-filter_complex "overlay=0:0" -c:v libsvtav1 -movflags faststart \
-y output/rating.mp4
# or
ffmpeg -i source.mp4 -r $FRAMERATE -i frames/%06d.png \
-filter_complex "overlay=0:0" -c:v h264 -movflags faststart \
-y output/rating.mp4
```
## Sample
A sample frame from video with a realtime embedded graph. The red line shows the
current position on the timeline.
[](images/frame.jpg)