[FFmpeg-user] Using FFMpeg to produce LL-HLS

[Simon Brown]

On Mon, 17 Feb 2020 at 12:06, Dennis Mungai <dmngaie at gmail.com> wrote:

> On Mon, 17 Feb 2020, 14:50 Simon Brown, <simon.k.brown at gmail.com> wrote:
>
> > I'm trying to reduce the latency of streaming video to a web page.
> > I have tried a few options:
> > 1) WebRTC - great, but doesn't support interlaced video
> > 2) fMP4 - couldn't get a working solution
> > 3) HLS - great, plays interlaced video as well, but latency is appalling
> > 4) LL-HLS - can't find anything that produces it.
> >
> > Does FFMpeg support generating LL-HLS?
> >
> > Regards,
> > Simon
> >
>
> Yes, though at the moment you'll have to use the dash muxer.
>
> See ffmpeg -h muxer=dash
>
> For usage.
>
> >
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Thanks Dennis,
I've read through the options and looked at some examples and have
downloaded the latest FFMpeg build from zeranoe (nightly build).  That
produces this result:

C:\ffmpeg-20200216-8578433-win64-static\bin>ffmpeg.exe -i udp://
127.0.0.1:9034 -codec copy -f dash -seg_duration 1 -frag_duration 0.1
-window_size 5 -extra_window_size 5 -single_file 0 -lhls 1 -hls_playlist 1
-strict experimental -streaming 1 -adaptation_sets "id=0,streams=v
id=1,streams=a" c:\xampp\htdocs\video.m3u8
ffmpeg version git-2020-02-16-8578433 Copyright (c) 2000-2020 the FFmpeg
developers
  built with gcc 9.2.1 (GCC) 20200122
  configuration: --enable-gpl --enable-version3 --enable-sdl2
--enable-fontconfig --enable-gnutls --enable-iconv --enable-libass
--enable-libdav1d --enable-libbluray --enable-libfreetype
--enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb
--enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy
--enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx
--enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265
--enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp
--enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc
--enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom
--enable-libmfx --enable-ffnvcodec --enable-cuvid --enable-d3d11va
--enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth
--enable-libopenmpt --enable-amf
  libavutil      56. 41.100 / 56. 41.100
  libavcodec     58. 70.100 / 58. 70.100
  libavformat    58. 38.101 / 58. 38.101
  libavdevice    58.  9.103 / 58.  9.103
  libavfilter     7. 76.100 /  7. 76.100
  libswscale      5.  6.100 /  5.  6.100
  libswresample   3.  6.100 /  3.  6.100
  libpostproc    55.  6.100 / 55.  6.100
Input #0, mpegts, from 'udp://127.0.0.1:9034':
  Duration: N/A, start: 68873.648600, bitrate: N/A
  Program 1
    Stream #0:0[0x1100]: Video: h264 (Main) ([27][0][0][0] / 0x001B),
yuv420p(tv, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 50 fps, 50 tbr, 90k
tbn, 100 tbc
    Stream #0:1[0x1110]: Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000
Hz, stereo, fltp, 192 kb/s
[dash @ 0000022f500c6a40] No bit rate set for stream 0
[dash @ 0000022f500c6a40] Opening 'init-stream0.m4s' for writing
[mp4 @ 0000022f4e21ac00] Could not find tag for codec h264 in stream #0,
codec not currently supported in container
Could not write header for output file #0 (incorrect codec parameters ?):
Invalid argument
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (copy)
    Last message repeated 1 times

What am I doing wrong?  I thought h264 was supported in HLS/Dash?

Regards,
Simon