public VideoEncoder(int width, int height, int fps)
{
_converter = new VideoConverter(CODEC_PIXEL_FORMAT);
AVCodec *codec = FFmpegInvoke.avcodec_find_encoder(CODEC_ID);
if (codec == null)
{
throw new Exception("Codec not found");
}
_codec_context = FFmpegInvoke.avcodec_alloc_context3(codec);
if (_codec_context == null)
{
throw new Exception("Could not allocate video codec context");
}
_codec_context->bit_rate = 50000;
_codec_context->width = width;
_codec_context->height = height;
_codec_context->time_base = new AVRational()
{
num = 1, den = fps
};
_codec_context->gop_size = 10; // emit one intra frame every ten frames
_codec_context->max_b_frames = 1;
_codec_context->pix_fmt = CODEC_PIXEL_FORMAT;
FFmpegInvoke.av_opt_set(_codec_context->priv_data, "preset", "fast", 0);
if (FFmpegInvoke.avcodec_open2(_codec_context, codec, null) < 0)
{
throw new Exception("Could not open codec");
}
_avFrameYUV = FFmpegInvoke.avcodec_alloc_frame();
if (_avFrameYUV == null)
{
throw new Exception("Could not allocate video frame");
}
_avFrameYUV->format = (int)CODEC_PIXEL_FORMAT;
_avFrameYUV->width = width;
_avFrameYUV->height = height;
var ret1 = FFmpegInvoke.av_image_alloc(&_avFrameYUV->data_0, _avFrameYUV->linesize, width, height, CODEC_PIXEL_FORMAT, 32);
if (ret1 < 0)
{
throw new Exception("Could not allocate raw picture buffer");
}
_avFrameBGR = FFmpegInvoke.avcodec_alloc_frame();
if (_avFrameBGR == null)
{
throw new Exception("Could not allocate video frame");
}
_avFrameBGR->format = (int)INPUT_PIXEL_FORMAT;
_avFrameBGR->width = width;
_avFrameBGR->height = height;
var ret2 = FFmpegInvoke.av_image_alloc(&_avFrameBGR->data_0, _avFrameBGR->linesize, width, height, INPUT_PIXEL_FORMAT, 32);
if (ret2 < 0)
{
throw new Exception("Could not allocate raw picture buffer");
}
}