[FFmpeg-user] Issue with HLS muxer (segments skipped)

[Massimo Battistel]

Hello,
I'm converting an udp transport stream to http live streaming (hls).
Input stream has no error and web server is properly configured.
My OS is W7 64bit, Zeranoe builds.

When I try to open the http stream with ffplay (there is a similar issue
with vlc):
ffplay http://192.168.0.155/live/index.m3u8
I experience frequent stream freeze and the following message appears:
"skipping 1 segments ahead, expired from playlists"

Using VLC to generate hls fixes the problem, I can see it correctly with
ffplay.



FFMpeg (and vlc) command line follows:

ffmpeg -probesize 20M -i udp://127.0.0.1:1500 ^
       -vcodec libx264 -profile:v baseline -b:v 500k -minrate 500k -maxrate
500k -bufsize 500k -vf scale=640:360:1,fps=fps=25 ^
       -acodec libvo_aacenc -b:a 128k -ac 2 -ar 44100 ^
       -f hls -hls_time 5 ^
              -hls_list_size 3 ^
              -hls_base_url "http://192.168.0.155/live/" ^
              -hls_allow_cache 0 ^
              -hls_flags delete_segments ^
               c:\wamp\www\live\index.m3u8

ffmpeg version N-69498-g7620d48 Copyright (c) 2000-2015 the FFmpeg
developers
  built with gcc 4.9.2 (GCC)
  configuration: --disable-static --enable-shared --enable-gpl
--enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib
--enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv
--enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca
--enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc
--enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb
--enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus
--enable-librtmp --enable-libschroedinger --enable-libsoxr
--enable-libspeex --enable-libtheora --enable-libtwolame
--enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc
--enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp
--enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid
--enable-lzma --enable-decklink --enable-zlib
  libavutil      54. 18.100 / 54. 18.100
  libavcodec     56. 21.102 / 56. 21.102
  libavformat    56. 19.100 / 56. 19.100
  libavdevice    56.  4.100 / 56.  4.100
  libavfilter     5.  9.103 /  5.  9.103
  libswscale      3.  1.101 /  3.  1.101
  libswresample   1.  1.100 /  1.  1.100
  libpostproc    53.  3.100 / 53.  3.100
[h264 @ 00631720] non-existing PPS 0 referenced
    Last message repeated 1 times
[h264 @ 00631720] decode_slice_header error
[h264 @ 00631720] no frame!
Input #0, mpegts, from 'udp://127.0.0.1:1500':
  Duration: N/A, start: 387.174667, bitrate: N/A
  Program 1
    Metadata:
      service_name    : Service01
      service_provider: FFmpeg
    Stream #0:0[0x100]: Video: h264 (Main) ([27][0][0][0] / 0x001B),
yuv420p, 720x576 [SAR 64:45 DAR 16:9], 25 fps, 25 tbr, 90k tbn, 50 tbc
    Stream #0:1[0x101]: Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz,
stereo, fltp, 140 kb/s
[libx264 @ 006d2c80] using SAR=1/1
[libx264 @ 006d2c80] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
[libx264 @ 006d2c80] profile Constrained Baseline, level 3.0
Output #0, hls, to 'c:\wamp\www\live\index.m3u8':
  Metadata:
    encoder         : Lavf56.19.100
    Stream #0:0: Video: h264 (libx264), yuv420p, 640x360 [SAR 1:1 DAR
16:9], q=-1--1, 500 kb/s, 25 fps, 90k tbn, 25 tbc
    Metadata:
      encoder         : Lavc56.21.102 libx264
    Stream #0:1: Audio: aac (libvo_aacenc), 44100 Hz, stereo, s16, 128 kb/s
    Metadata:
      encoder         : Lavc56.21.102 libvo_aacenc
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
  Stream #0:1 -> #0:1 (aac (native) -> aac (libvo_aacenc))
Press [q] to stop, [?] for help
frame=  102 fps=0.0 q=29.0 size=N/A time=00:00:04.35 bitrate=N/A dup=8
drop=0
frame=  149 fps=147 q=28.0 size=N/A time=00:00:06.18 bitrate=N/A dup=8
drop=0
frame=  163 fps=106 q=28.0 size=N/A time=00:00:06.69 bitrate=N/A dup=8
drop=0
frame=  175 fps= 85 q=29.0 size=N/A time=00:00:07.25 bitrate=N/A dup=8
drop=0
frame=  189 fps= 73 q=28.0 size=N/A time=00:00:07.74 bitrate=N/A dup=8
drop=0
frame=  202 fps= 65 q=29.0 size=N/A time=00:00:08.27 bitrate=N/A dup=8
drop=0
frame=  214 fps= 59 q=30.0 size=N/A time=00:00:08.81 bitrate=N/A dup=8
drop=0
frame=  227 fps= 55 q=30.0 size=N/A time=00:00:09.29 bitrate=N/A dup=8
drop=0
frame=  242 fps= 52 q=30.0 size=N/A time=00:00:09.92 bitrate=N/A dup=8
drop=0



VLC command line follows:

vlc -I dummy udp://@:1500 --sout-avcodec-strict=-2
--sout=#transcode{width=640,height=360,fps=25,vcodec=h264,vb=512,venc=x264
{aud,profile=baseline,level=30,keyint=25,ref=1},acodec=mp4a,ab=64}:std{access=livehttp{seglen=5,delsegs=true,numsegs=3,index=C:\wamp\www\live
\index.m3u8,index-url=http://192.168.0.155/live/index-########.ts
},mux=ts{use-key-frames},dst=C:\wamp\www\live\index-########.ts}



Thanks,
MB