[FFmpeg-trac] #6352(undetermined:new): HLS stream is loaded slower than it is needed
FFmpeg
trac at avcodec.org
Tue Apr 25 14:37:28 EEST 2017
#6352: HLS stream is loaded slower than it is needed
--------------------------------------+----------------------------------
Reporter: Alexander | Type: defect
Status: new | Priority: normal
Component: undetermined | Version: 3.2.4
Keywords: hls | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
--------------------------------------+----------------------------------
I have stream http://access1.evolife.su:8080/rep73/index.m3u8 which is
playing normally in browser (Safari on macOS).
But if I try to convert it on the fly with ffmpeg and publish somewhere
(or just put to the /dev/null) I get instant freezes with lost of video
and audio.
How to reproduce:
{{{
ffmpeg -i "http://access1.evolife.su:8080/rep73/index.m3u8" -acodec aac
-vcodec copy -f flv /dev/null
ffmpeg version 3.2.4 Copyright (c) 2000-2017 the FFmpeg developers
built with FreeBSD clang version 3.4.1 (tags/RELEASE_34/dot1-final
208032) 20140512
configuration: --prefix=/usr/local --mandir=/usr/local/man
--datadir=/usr/local/share/ffmpeg
--pkgconfigdir=/usr/local/libdata/pkgconfig --enable-shared --enable-pic
--enable-gpl --enable-postproc --enable-avfilter --enable-avresample
--enable-pthreads --cc=cc --disable-indev=alsa --disable-outdev=alsa
--disable-libopencore-amrnb --disable-libopencore-amrwb --disable-libass
--disable-libbs2b --disable-libcaca --disable-libcdio --disable-libcelt
--disable-chromaprint --disable-libdc1394 --disable-debug --enable-
htmlpages --disable-libebur128 --disable-libfdk-aac --enable-ffserver
--disable-libflite --enable-fontconfig --enable-libfreetype --disable-
frei0r --disable-libfribidi --disable-libgme --disable-libgsm --enable-
iconv --disable-libilbc --disable-indev=jack --disable-libkvazaar
--disable-ladspa --enable-libmp3lame --disable-libbluray --enable-mmx
--disable-libmodplug --disable-netcdf --disable-openal --disable-
indev=openal --disable-opencl --disable-libopencv --disable-opengl
--disable-libopenh264 --disable-libopenjpeg --disable-optimizations
--disable-libopus --disable-libpulse --disable-indev=pulse --disable-
outdev=pulse --enable-runtime-cpudetect --disable-librubberband --enable-
libschroedinger --disable-ffplay --disable-outdev=sdl --disable-sdl2
--disable-libsmbclient --disable-libsnappy --disable-indev=sndio
--disable-outdev=sndio --disable-libsoxr --disable-libspeex --enable-sse
--disable-libssh --disable-libtesseract --enable-libtheora --disable-
libtwolame --disable-libv4l2 --disable-indev=v4l2 --disable-outdev=v4l2
--disable-vaapi --disable-vdpau --disable-libvidstab --enable-libvorbis
--disable-libvo-amrwbenc --enable-libvpx --disable-libwavpack --disable-
libwebp --disable-x11grab --enable-libx264 --enable-libx265 --disable-
libxcb --enable-libxvid --disable-outdev=xv --disable-libzimg --disable-
libzmq --disable-libzvbi --disable-gcrypt --enable-gmp --disable-librtmp
--disable-gnutls --enable-openssl --enable-version3 --enable-nonfree
libavutil 55. 34.101 / 55. 34.101
libavcodec 57. 64.101 / 57. 64.101
libavformat 57. 56.101 / 57. 56.101
libavdevice 57. 1.100 / 57. 1.100
libavfilter 6. 65.100 / 6. 65.100
libavresample 3. 1. 0 / 3. 1. 0
libswscale 4. 2.100 / 4. 2.100
libswresample 2. 3.100 / 2. 3.100
libpostproc 54. 1.100 / 54. 1.100
Input #0, hls,applehttp, from
'http://access1.evolife.su:8080/rep73/index.m3u8':
Duration: N/A, start: 56336.558222, bitrate: N/A
Program 0
Metadata:
variant_bitrate : 0
Stream #0:0: Video: h264 (Main) ([27][0][0][0] / 0x001B), yuv420p(tv),
720x576 [SAR 64:45 DAR 16:9], 25 fps, 25 tbr, 90k tbn, 50 tbc
Metadata:
variant_bitrate : 0
Stream #0:1: Audio: mp2 ([4][0][0][0] / 0x0004), 48000 Hz, stereo,
s16p, 192 kb/s
Metadata:
variant_bitrate : 0
File '/dev/null' already exists. Overwrite ? [y/N] y
Output #0, flv, to '/dev/null':
Metadata:
encoder : Lavf57.56.101
Stream #0:0: Video: h264 (Main) ([7][0][0][0] / 0x0007), yuv420p(tv),
720x576 [SAR 64:45 DAR 16:9], q=2-31, 25 fps, 25 tbr, 1k tbn, 90k tbc
Metadata:
variant_bitrate : 0
Stream #0:1: Audio: aac (LC) ([10][0][0][0] / 0x000A), 48000 Hz,
stereo, fltp, 128 kb/s
Metadata:
variant_bitrate : 0
encoder : Lavc57.64.101 aac
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Stream #0:1 -> #0:1 (mp2 (native) -> aac (native))
Press [q] to stop, [?] for help
skipping 2 segments ahead, expired from playlists0:00:05.64
bitrate=2422.2kbits/s speed=0.326x
skipping 1 segments ahead, expired from playlists0:00:22.92
bitrate=1148.3kbits/s speed=0.891x
skipping 2 segments ahead, expired from playlists0:00:34.36
bitrate=1179.4kbits/s speed=0.815x
skipping 2 segments ahead, expired from playlists0:00:51.32
bitrate=1060.6kbits/s speed=0.858x
skipping 3 segments ahead, expired from playlists0:01:08.92
bitrate=1007.1kbits/s speed=0.823x
skipping 3 segments ahead, expired from playlists0:01:43.44
bitrate=1099.6kbits/s speed=0.864x
skipping 3 segments ahead, expired from playlists0:02:06.64
bitrate=1017.9kbits/s speed=0.912x
skipping 5 segments ahead, expired from playlists0:02:29.64 bitrate=
957.6kbits/s speed=0.841x
skipping 4 segments ahead, expired from playlists0:03:04.20 bitrate=
856.9kbits/s speed=0.898x
}}}
It is strange that speed is less than 1.0x though CPU is loaded with
ffmpeg less than 15%, network is 100Mbit/s and absolutely not loaded.
--
Ticket URL: <https://trac.ffmpeg.org/ticket/6352>
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