On Mon, 25 Aug 2014 15:23:20 +0200 Hector Alonso <hector.alonso.apari...@gmail.com> wrote:
> Hi, > I've rebuilt ffmpeg using these instructions > https://trac.ffmpeg.org/wiki/CompilationGuide/MSVC from the Visual Studio > Console, installing MinGW directly from the link with the flags --enable-dxva2 > and --enable-hwaccel=h264_dxva2 and is almost working but I get a lot > of errors: > -1094995529 "Invalid data found when processing input" > from avcodec_decode_video2 a lot of artifacts and a very poor and > inconsistent image quality. > This is my dxva initialization code: > > _pCodecCtx->flags|= CODEC_CAP_DR1; > _pCodecCtx->flags|= CODEC_CAP_HWACCEL; > > InputStream *ist = new InputStream (); > ist->hwaccel_id = HWACCEL_AUTO; > ist->hwaccel_device = "dxva2"; > ist->dec = _pCodec; > ist->dec_ctx = _pCodecCtx; > _pCodecCtx->coded_width = 1280; > _pCodecCtx->coded_height = 720; > _pCodecCtx->opaque = ist; > dxva2_init(_pCodecCtx); > _pCodecCtx->opaque = ist; > _pCodecCtx->get_buffer2 = ist->hwaccel_get_buffer; > _pCodecCtx->get_format = get_format; > _pCodecCtx->thread_safe_callbacks = 0; > > before calling > > if (avcodec_open2(_pCodecCtx , _pCodec, 0) < 0) ... > > Where get_format is: > > static enum AVPixelFormat get_format(AVCodecContext *s, const enum > AVPixelFormat *pix_fmts) > { > InputStream* ist = (InputStream*)s->opaque; > ist->active_hwaccel_id = HWACCEL_DXVA2; > ist->hwaccel_pix_fmt = AV_PIX_FMT_DXVA2_VLD; > return ist->hwaccel_pix_fmt; > } > > Find attached my modified ffmpeg_dxva2.cpp and ffmpeg_dxva2.h files from > the original ffmpeg_dxva2.c and the InputStream declaration from ffmpeg.h > > For getting the decoded frame I call: dxva2_retrieve_data_call, and then I > convert it to YUV420p (I make the final conversion via pixel shader with > OpenGL texture). > > Also, with my old CPU decoder I had 3-6% CPU usage and 5-10% GPU usage (as > I said, I'm converting and painting with OpenGL) and now with the "GPU > Accelerated" one I have 5-13% CPU and 6-12% GPU. PS: nevcairiel mentioned: http://developer.download.nvidia.com/opengl/specs/WGL_NV_DX_interop.txt Unfortunately, it's marked as experimental, and other drivers probably don't provide it. > Any thoughts? > > Thank you! > _______________________________________________ Libav-user mailing list Libav-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/libav-user
