[FFmpeg-user] Simple webm ffmpeg passthrough unexpectedly use 100% cpu

[LANGLOIS Olivier PIS -EXT]

Hi,

I want to live stream a webm file with ffserver. I have preprocess my file to avoid any on the fly transcoding. I obviously failed something as ffmpeg is using 100% cpu and the ffserver stream output is stuttering.

Can you help me see what I am missing:

my ffserver.conf stream setting:

<Stream test1.webm>
Feed feed1.ffm
Format webm
VideoCodec libvpx
VideoBitRate 200
VideoSize 480x368
StartSendOnKey
AVOptionVideo flags +global_header
NoAudio
ACL allow 192.168.16.1
ACL allow 192.168.16.234
ACL allow 127.0.0.1
</Stream>

lano1106 at hpmini ~/Videos $ ffmpeg -re -i trololo.webm http://localhost:8090/feed1.ffm
ffmpeg version 2.0.1 Copyright (c) 2000-2013 the FFmpeg developers
  built on Aug 11 2013 14:58:31 with gcc 4.8.1 (GCC) 20130725 (prerelease)
  configuration: --prefix=/usr --disable-debug --disable-static --enable-avresample --enable-dxva2 --enable-fontconfig --enable-gpl --enable-libass --enable-libbluray --enable-libfreetype --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libv4l2 --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxvid --enable-pic --enable-postproc --enable-runtime-cpudetect --enable-shared --enable-swresample --enable-vdpau --enable-version3 --enable-x11grab
  libavutil      52. 38.100 / 52. 38.100
  libavcodec     55. 18.102 / 55. 18.102
  libavformat    55. 12.100 / 55. 12.100
  libavdevice    55.  3.100 / 55.  3.100
  libavfilter     3. 79.101 /  3. 79.101
  libavresample   1.  1.  0 /  1.  1.  0
  libswscale      2.  3.100 /  2.  3.100
  libswresample   0. 17.102 /  0. 17.102
  libpostproc    52.  3.100 / 52.  3.100
Input #0, matroska,webm, from 'trololo.webm':
  Duration: 00:02:41.36, start: 0.000000, bitrate: 217 kb/s
    Stream #0:0: Video: vp8, yuv420p, 480x368, SAR 134:131 DAR 4020:3013, 29.97 fps, 29.97 tbr, 1k tbn, 1k tbc (default)
[libvpx @ 0x946a2c0] v1.2.0
Output #0, ffm, to 'http://localhost:8090/feed1.ffm':
  Metadata:
    creation_time   : now
    encoder         : Lavf55.12.100
    Stream #0:0: Video: vp8 (libvpx), yuv420p, 480x368 [SAR 134:131 DAR 4020:3013], q=2-31, 200 kb/s, 1000k tbn, 29.97 tbc (default)
Stream mapping:
  Stream #0:0 -> #0:0 (vp8 -> libvpx)


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