Starting playback of TS stream from seek position takes over 15 seconds.

[Zuza]

Summary of the bug: When ts file (​http://streaming.dolby.com/ftproot/mitXperts/ts/ts_multi_lang.ts) is started from 44 seconds it takes over 15 seconds to start playback. When MP4 version of the stream (​http://streaming.dolby.com/ftproot/mitXperts/mp4/mp4_multi_lang.mp4) is used playback starts almost immediately

% ffplay -v 9 -loglevel 99 -i http://streaming.dolby.com/ftproot/mitXperts/ts/ts_multi_lang.ts -ast 1 -ss 00:00:44 
ffplay version 2.8.15-0ubuntu0.16.04.1 Copyright (c) 2003-2018 the FFmpeg developers
  built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.10) 20160609
  configuration: --prefix=/usr --extra-version=0ubuntu0.16.04.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzvbi --enable-openal --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-libx264 --enable-libopencv

[Zuza]

Console log from command execution.

[Zuza]

Console log from mp4 stream starting.