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