FFMPEG_AMF_WRITER_ID  234 libavcodec/amfenc.c     ctx->trace->pVtbl->RegisterWriter(ctx->trace, FFMPEG_AMF_WRITER_ID,(AMFTraceWriter*)&ctx->tracer, 1);
FFMPEG_AMF_WRITER_ID  235 libavcodec/amfenc.c     ctx->trace->pVtbl->SetWriterLevel(ctx->trace, FFMPEG_AMF_WRITER_ID, AMF_TRACE_TRACE);
FFMPEG_AMF_WRITER_ID  393 libavcodec/amfenc.c         ctx->trace->pVtbl->UnregisterWriter(ctx->trace, FFMPEG_AMF_WRITER_ID);