So the keyframe cannot be fed to the decoder one nal at a time? Is that what you are suggesting?
On Mon, Jun 10, 2013 at 2:40 PM, Andy Shaules <[email protected]> wrote: > I always had to decode from the latest key frame up to the desired > stream time nal, > > > On 6/10/2013 2:36 PM, Faraz Khan wrote: > > Hi all, > I'm trying to use ffmpeg as a decoder for a real-time x264 stream that I'm > generating. It works fine if I try to decode entire frames, but if I try to > decode a single NALU the decoder errors out saying 'no frame'. I've tried > using the parser (av_parser_parse2) but the h264 decoder doesnt seem to > like that output either. I'm using x264 with annex-b and repeat-headers on. > > The encoder config is as follows: > > x264params.b_sliced_threads = 1; > x264params.i_slice_max_size = 1350; > x264params.i_width = yuvSize.width; > x264params.i_height = yuvSize.height; > x264params.i_fps_num = 10; > x264params.i_fps_den = 1; > x264params.b_vfr_input = 0; > x264params.rc.i_bitrate = 1500; > > // Intra refres: > x264params.i_keyint_max = 50000000; > x264params.b_intra_refresh = 1; > > //Rate control: > > x264params.rc.i_rc_method = X264_RC_ABR; > x264params.rc.i_vbv_buffer_size = 300; > x264params.rc.i_vbv_max_bitrate = 1500; > > //For streaming: > x264params.b_repeat_headers = 1; > x264params.b_annexb = 1; > > x264_param_apply_profile(&x264params, "baseline"); > > > > I do the encode with: > > int frame_size = x264_encoder_encode(x264Encoder, &nals, &i_nals, & > pic_in, &pic_out); > > > Now, since the max slice size is 1350, each packet output is a udp > packet of size < MTU (this is true) and sent across the network. > > I iterate over the nals[i].p_payload and send them over to the ffmpeg side > for decoding. I receive the correct packet on the remote side. > > If I assemble ALL the NALUs that were output in this frame and feed it > directly to the decoder (even without the parser), it works fine! If I feed > one NALU at a time, it fails (event with the parse). I'm sending it to the > parser like: > > > int plen = av_parser_parse2(codecParser, decoderContext, &outbuf, > &outside, indata,inlength,0,0,0); > > > plen always reports that it consumed the entire NALU that I gave it - > after consuming a few NALUs, the outsize and outbuf are set to some value. > Feeding it into the decoder using: > > > int len = avcodec_decode_video2(decoderContext,decoderOutframe, > &gotpic,&avpkt); > > > Results in it saying 'No frame'. Again, if avpkt.data contains the > entire frame (all NALUs concatenated) it will work! > > > I'm obviously doing some obviously wrong - but I really cant figure out > why it wont decode a single NALU. Or is this a limitation in ffmpeg? > > > Thanks Guys! > > > > > -- > Faraz Khan > Simple Collaboration Screensharing > www.screenhero.com > > > _______________________________________________ > Libav-user mailing > [email protected]http://ffmpeg.org/mailman/listinfo/libav-user > > > > _______________________________________________ > Libav-user mailing list > [email protected] > http://ffmpeg.org/mailman/listinfo/libav-user > > -- -- Faraz Khan Simple Collaboration Screensharing www.screenhero.com
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