[FFmpeg-trac] #5574(undetermined:new): unacceptable latency to convert rtsp to hls with ffmpeg

[FFmpeg]

#5574: unacceptable latency to convert rtsp to hls with ffmpeg
-------------------------------------+-------------------------------------
             Reporter:  fanniewang   |                     Type:
               Status:  new          |  sponsoring request
            Component:               |                 Priority:  important
  undetermined                       |                  Version:  2.7.3
             Keywords:  ffmpeg       |               Blocked By:
  version 2.7.git                    |  Reproduced by developer:  0
             Blocking:               |
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:
 We need to play our rtsp live streaming in ios, so we used ffmpeg to
 convert rtsp to hls, and then publish the m3u8 file by nginx.
 But after then, we see huge latency when play it, pls help to check the
 follow command, and help to fix the latency for me, thanks a lot.

 ffmpeg -i rtsp://kanq:kanq12345@192.168.1.231 -c:v copy -preset ultrafast
 -fflags flush_packets -tune zerolatency -an -g 1 -flags -global_header -f
 hls -hls_time 1 -hls_list_size 3 -hls_wrap 3 play280.m3u8


 [root at localhost ffmpeg-3.0.2-64bit-static]# ffmpeg -v
 ffmpeg version 2.7.git Copyright (c) 2000-2015 the FFmpeg developers
   built with gcc 4.8.3 (GCC) 20140911 (Red Hat 4.8.3-9)
   configuration: --prefix=/wlian/ffmpeg_build --extra-
 cflags=-I/wlian/ffmpeg_build/include --extra-
 ldflags=-L/wlian/ffmpeg_build/lib --bindir=/wlian/bin --extra-libs=-ldl
 --enable-version3 --enable-libopencore-amrnb --enable-libopencore-amrwb
 --enable-libvpx --enable-libfaac --enable-libmp3lame --enable-libtheora
 --enable-libvorbis --enable-libx264 --enable-libvo-aacenc --enable-libxvid
 --enable-ffplay --enable-postproc --enable-nonfree --enable-avfilter
 --enable-pthreads --enable-gpl
   libavutil      54. 31.100 / 54. 31.100
   libavcodec     56. 58.100 / 56. 58.100
   libavformat    56. 40.101 / 56. 40.101
   libavdevice    56.  4.100 / 56.  4.100
   libavfilter     5. 37.100 /  5. 37.100
   libswscale      3.  1.101 /  3.  1.101
   libswresample   1.  2.101 /  1.  2.101
   libpostproc    53.  3.100 / 53.  3.100

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Ticket URL: <https://trac.ffmpeg.org/ticket/5574>
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