ffmpeg-filter-proxy

A FFMpeg video filter proxy.

Purpose

To make it easier to develop and test video filters for use in FFmpeg.
To make it easier to implement a video filter using different programming languages.

Proxied filter

A dynamic shared object that provides the following signatures:

int filter_init(const char *config, void **user_data)
int filter_frame(unsigned char *data, unsigned int data_size, int width, int height, int line_size, double ts_millis, void *user_data)
void filter_uninit(void *user_data)

On success, filter_init and filter_frame should return 0. A nonzero return value signals an error.

The config parameter to filter_init is filter implementation specific. It could be a config filename or the complete config, or NULL if the proxied filter doesn't need any specific configuration.

Limitations

Only AV_PIX_FMT_BGRA is used right now since that's what we need.

It is possible though, to preserve 10 bit colors using the clear param in combination with FFmpegs split and overlay filters:

-filter_complex "split=2[main][over1];[over1]proxy=clear=1:<other proxy params>[over2];[main][over2]overlay=format=yuv420p10

License

This software is released under the GNU Lesser General Public License version 2.1 or later (LGPL v2.1+).

Primary Maintainers