souphttpsrc + avdec_h264 latency problem.

[paolo perotinus]

I'm still fighting against the avdec_h264 latency problem.The pipeline (which I translated into C code) on my receiver is:
gst-launch-1.0 -v souphttpsrc location=http://127.0.0.1:8080/stream.ts ! tsdemux name=demuxer demuxer. ! h264parse ! avdec_h264 ! autovideosink

In gstavviddec.c  the following lines reduce the latency if the upstream is live:


  {    GstQuery *query;    gboolean is_live;
    if (ffmpegdec->max_threads == 0) {      if (!(oclass->in_plugin->capabilities & CODEC_CAP_AUTO_THREADS))        ffmpegdec->context->thread_count = gst_ffmpeg_auto_max_threads ();      else        ffmpegdec->context->thread_count = 0;    } else      ffmpegdec->context->thread_count = ffmpegdec->max_threads;
    query = gst_query_new_latency ();    is_live = FALSE;    /* Check if upstream is live. If it isn't we can enable frame based     * threading, which is adding latency */    if (gst_pad_peer_query (GST_VIDEO_DECODER_SINK_PAD (ffmpegdec), query)) {      gst_query_parse_latency (query, &is_live, NULL, NULL);    }    gst_query_unref (query);
    if (is_live)      ffmpegdec->context->thread_type = FF_THREAD_SLICE;    else      ffmpegdec->context->thread_type = FF_THREAD_SLICE | FF_THREAD_FRAME;  }


If I set the is-live property (  g_object_set (G_OBJECT (souphttpsource), "location", argv[1], "is-live", TRUE, NULL); )  then the decoder's latency is reduced, according to the lines above,BUT some latency is added on the souphttpsrc element. 
How can I avoid that? 
For now, the only solution I have is to HACK the code of gstavviddec.c and force ffmpegdec->context->thread_type = FF_THREAD_SLICE also in the case that is-live == FALSE (with the consequence that I don't get latency neither on the souphttpsrc neither on the avdec_h264 element)It seems to me something that should be fixed in the library, though...
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