set vsync to 0 2015-04-08 10:51 GMT-03:00 Info || Non-Lethal Applications < [email protected]>:
> We’re trying to send an x264 encoded RTP stream to an iOS device. > While it works in general, we aren’t sure if we have the best settings to > achieve our goal. > We read on a blog from an x264 developer that it should be possible to > achieve a latency of x264 encoded RTP streams of around 10 ms from end to > end. > > We are nowhere near that in our setup. > The lowest we can get is > 1 sec. > > Here are the settings we are using (c is the AVCodecContext pointer): > > c->bit_rate_tolerance = 0; > c->rc_max_rate = 0; > c->rc_buffer_size = 0; > c->gop_size = 5; > c->max_b_frames = 0; > c->b_frame_strategy = 1; > c->coder_type = 1; > c->me_cmp = 1; > c->me_range = 16; > c->qmin = 10; > c->qmax = 51; > c->scenechange_threshold = 40; > c->flags |= CODEC_FLAG_LOOP_FILTER; > c->me_method = ME_HEX; > c->me_subpel_quality = 5; > c->i_quant_factor = 0.71; > c->qcompress = 0.6; > c->max_qdiff = 4; > > Additionally, we tried to set some libx264 private settings like so: > > av_opt_set(_pVideoCodecCtx->priv_data, "preset", "ultrafast", 0); > av_opt_set(_pVideoCodecCtx->priv_data, "tune", "zerolatency", 0); > av_opt_set(_pVideoCodecCtx->priv_data, "g", “30", 0); > > Does anyone have a hint what we could do to get more speed? > Also, is there anything we can set on the decoder side to decrease > the delay? > We are on the defaults there. > > Thanks! > > Best regards, > > Flo > > _______________________________________________ > Libav-user mailing list > [email protected] > http://ffmpeg.org/mailman/listinfo/libav-user > > --
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