Simplify fix for RAWVIDEO handling for ffmpeg 4+

Author: eisneinechse

src/FFmpegWriter.cpp

@@ -1995,8 +1995,7 @@ bool FFmpegWriter::write_video_packet(std::shared_ptr<Frame> frame, AVFrame *fra
 #if (LIBAVFORMAT_VERSION_MAJOR >= 58)
 	ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::write_video_packet", "frame->number", frame->number, "oc->oformat->flags", oc->oformat->flags);
 
-	if (video_st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO &&
-        video_st->codecpar->codec_id == AV_CODEC_ID_RAWVIDEO) {
+	if (AV_GET_CODEC_TYPE(video_st) == AVMEDIA_TYPE_VIDEO && AV_FIND_DECODER_CODEC_ID(video_st) == AV_CODEC_ID_RAWVIDEO) {
 #else
 	ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::write_video_packet", "frame->number", frame->number, "oc->oformat->flags & AVFMT_RAWPICTURE", oc->oformat->flags & AVFMT_RAWPICTURE);