Buffer video frames, and make them available to the filter chain.

This source is mainly intended for a programmatic use, in particular through the interface defined in libavfilter/vsrc_buffer.h.

It accepts the following parameters: width:height:pix_fmt_string:timebase_num:timebase_den:sample_aspect_ratio_num:sample_aspect_ratio.den:scale_params

All the parameters but scale_params need to be explicitely defined.

Follows the list of the accepted parameters.

width, height

Specify the width and height of the buffered video frames.

pix_fmt_string

A string representing the pixel format of the buffered video frames. It may be a number corresponding to a pixel format, or a pixel format name.

timebase_num, timebase_den

Specify numerator and denomitor of the timebase assumed by the timestamps of the buffered frames.

sample_aspect_ratio.num, sample_aspect_ratio.den

Specify numerator and denominator of the sample aspect ratio assumed by the video frames.

scale_params

Specify the optional parameters to be used for the scale filter which is automatically inserted when an input change is detected in the input size or format.

For example:

buffer=320:240:yuv410p:1:24:1:1

will instruct the source to accept video frames with size 320x240 and with format "yuv410p", assuming 1/24 as the timestamps timebase and square pixels (1:1 sample aspect ratio). Since the pixel format with name "yuv410p" corresponds to the number 6 (check the enum PixelFormat definition in libavutil/pixfmt.h), this example corresponds to:

buffer=320:240:6:1:24:1:1