FFmpeg 4.1:avcodec_encode_video2()已被声明为已否决

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原因：FFmepg新版本已经将该API丢弃，需要新的API接口代替
解决方案1：将SDL检查设置为否（不推荐）

解决方案2：修改为新的API接口函数

• 旧API函数写法示例

int AnimationMp4VideoGeneration::WriteVideoFrame(AVFormatContext * oc, OutputStream * ost)
{
	int ret;
	AVCodecContext *c;
	AVFrame *frame;
	int got_packet = 0;
	AVPacket pkt = { 0 };
	c = ost->enc;
	frame = GetVideoFrame(ost);
	av_init_packet(&pkt);
	/* encode the image */
	ret = avcodec_encode_video2(c, &pkt, frame, &got_packet);
	if (ret < 0) {
		LOG("Error encoding video frame: %s\n");
		exit(1);
	}
	if (!got_packet) {
		ret = WriteFrame(oc, &c->time_base, ost->st, &pkt);
	}
	else {
		ret = 0;
	}

	if (ret < 0)
	{
		LOG("Error while writing video frame: %s\n");
		exit(1);
	}
	
	return (frame || got_packet) ? 0 : 1;
}

• 新API函数写法修改示例

int AnimationMp4VideoGeneration::WriteVideoFrame(AVFormatContext * oc, OutputStream * ost)
{
	int ret;
	AVCodecContext *c;
	AVFrame *frame;
	int got_packet = 0;
	AVPacket pkt = { 0 };
	c = ost->enc;
	frame = GetVideoFrame(ost);
	av_init_packet(&pkt);
	/* encode the image */
	ret = avcodec_send_frame(c, frame);
	if (ret < 0) {
		LOG("Error encoding video frame: %s\n");
		exit(1);
	}
	got_packet = avcodec_receive_packet(c, &pkt);
	if (!got_packet) {
		ret = WriteFrame(oc, &c->time_base, ost->st, &pkt);
	}
	else {
		ret = 0;
	}
	if (ret < 0)
	{
		LOG("Error while writing video frame: %s\n");
		exit(1);
	}
	
	return (frame || got_packet) ? 0 : 1;
}