feat: adds minimum resolution of 144p

docs/transcoding.md

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+# Transcoding in MediaCMS
+
+MediaCMS uses FFmpeg for transcoding media files. Most of the transcoding settings and configurations are defined in `files/helpers.py`.
+
+## Configuration Options
+
+Several transcoding parameters can be customized in `cms/settings.py`:
+
+### FFmpeg Preset
+
+The default FFmpeg preset is set to "medium". This setting controls the encoding speed and compression efficiency trade-off.
+
+```python
+# ffmpeg options
+FFMPEG_DEFAULT_PRESET = "medium" # see https://trac.ffmpeg.org/wiki/Encode/H.264
+```
+
+Available presets include:
+- ultrafast
+- superfast
+- veryfast
+- faster
+- fast
+- medium (default)
+- slow
+- slower
+- veryslow
+
+Faster presets result in larger file sizes for the same quality, while slower presets provide better compression but take longer to encode.
+
+### Other Transcoding Settings
+
+Additional transcoding settings in `settings.py` include:
+
+- `FFMPEG_COMMAND`: Path to the FFmpeg executable
+- `FFPROBE_COMMAND`: Path to the FFprobe executable
+- `DO_NOT_TRANSCODE_VIDEO`: If set to True, only the original video is shown without transcoding
+- `CHUNKIZE_VIDEO_DURATION`: For videos longer than this duration (in seconds), they get split into chunks and encoded independently
+- `VIDEO_CHUNKS_DURATION`: Duration of each chunk (must be smaller than CHUNKIZE_VIDEO_DURATION)
+- `MINIMUM_RESOLUTIONS_TO_ENCODE`: Always encode these resolutions, even if upscaling is required
+
+## Advanced Configuration
+
+For more advanced transcoding settings, you may need to modify the following in `files/helpers.py`:
+
+- Video bitrates for different codecs and resolutions
+- Audio encoders and bitrates
+- CRF (Constant Rate Factor) values
+- Keyframe settings
+- Encoding parameters for different codecs (H.264, H.265, VP9)