[FFmpeg-user] Several problems trying to stream raw video & audio as ASF through ffserver

Luke l1 at newanswertech.com
Sun Jun 15 03:07:45 CEST 2014

Anyone able to advise with this?  Thought I'd try again with a possibly more 
helpful subject.

On Thu, 12 Jun 2014, Luke wrote:

I am trying to stream a webcam with audio through ffmpeg 2.2 (Ubuntu 32 bit), to
an ffserver 2.2 (Ubuntu 64 bit) instance running on a remote machine.

I get a lot of these from ffmpeg while the stream is running:

[ffm @ 0xb803b00] Non-monotonous DTS in output stream 0:0; previous: 326160208,
current: 325682540; changing to 326160209. This may result in incorrect
timestamps in the output file.

But okay, it keeps working, so I ignore that.  Then I get:

[libfdk_aac @ 0xb80a260] Queue input is backward in time
[ffm @ 0xb803b00] Non-monotonous DTS in output stream 0:0; previous: 326160209,
current: 325726485; changing to 326160210. This may result in incorrect
timestamps in the output file.

Meanwhile, the ffserver is logging lots of these:

Thu Jun 12 08:11:30 2014 [asf_stream @ 0x2a5e890]Application provided invalid,
non monotonically increasing dts to muxer in stream 0: 1402560663965 >=
Thu Jun 12 08:11:30 2014 Error writing frame to output for stream 'test.asf':
Invalid argument

I think maybe these errors are cumulative, and at some point the error is too
much to handle, but that's only a guess.

Windows media player claims that there was a problem with the file, and doesn't 
try.  Mplayer on Ubuntu can play audio, but unfortunately the only available 
linux system is a headless machine accessed via ssh, so I can not determine 
whether mplayer is getting video.  Mplayer is not my intended audience anyway, 
but I used it for testing.

Abruptly, after a few minutes, my mplayer instance that is listening to the
stream dies with several of "Error while reading network stream.".
ffmpeg keeps streaming though.

Oh, not sure if it's related, but I'm also seeing this from ffserver, at the
beginning of the mplayer session:

Thu Jun 12 08:08:59 2014 [asf_stream @ 0x2a5e890]Codec for stream 1 does not use
global headers but container format requires global headers

My ffmpeg command:

ffmpeg -f oss -i /dev/dsp2 -f video4linux2 -i /dev/video0 \


Port 5430
BindAddress a.b.c.d
MaxHTTPConnections 50
MaxClients 45
MaxBandwidth 10000
CustomLog /var/log/ffserver.log
<Feed test.ffm>
File /home/vidstream/.test.ffm
FileMaxSize 50MB
# Windows Media Player
<Stream test.asf>
feed test.ffm
Format asf
VideoCodec msmpeg4v2
VideoFrameRate 15
VideoSize vga
VideoBitRate 320
VideoBufferSize 40
VideoGopSize 15
AudioCodec aac
AudioBitRate 128
AudioChannels 2
AudioSampleRate 44100
PreRoll 15
<Stream status.html>
Format status

ffmpeg says the following during startup phase:

ffmpeg version 2.2.git Copyright (c) 2000-2014 the FFmpeg developers
  built on Jun 12 2014 02:47:30 with gcc 4.4.7 (Debian 4.4.7-2)
  configuration: --prefix=/usr/local/ffmpeg_build
--extra-ldflags=-L/usr/local/ffmpeg_build/lib --bindir=/usr/local/bin
--extra-libs=-ldl --enable-gpl --enable-libass --enable-libfdk-aac
--enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libtheora
--enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree
  libavutil      52. 89.100 / 52. 89.100
  libavcodec     55. 66.100 / 55. 66.100
  libavformat    55. 43.100 / 55. 43.100
  libavdevice    55. 13.101 / 55. 13.101
  libavfilter     4.  7.100 /  4.  7.100
  libswscale      2.  6.100 /  2.  6.100
  libswresample   0. 19.100 /  0. 19.100
  libpostproc    52.  3.100 / 52.  3.100
Guessed Channel Layout for  Input Stream #0.0 : stereo
Input #0, oss, from '/dev/dsp2':
  Duration: N/A, start: 1402597049.537882, bitrate: 1536 kb/s
    Stream #0:0: Audio: pcm_s16le, 48000 Hz, 2 channels, s16, 1536 kb/s
[21827264.482140] ehci_hcd 0000:00:1d.7: dma_pool_free buffer-32,
c0500000/500000 (bad dma)
[21827264.487722] ehci_hcd 0000:00:1d.7: dma_pool_free buffer-32,
c06e0000/6e0000 (bad dma)
[21827264.493086] ehci_hcd 0000:00:1d.7: dma_pool_free buffer-32,
c0700000/700000 (bad dma)
Input #1, video4linux2,v4l2, from '/dev/video0':
  Duration: N/A, start: 1402597050.073822, bitrate: 147456 kb/s
    Stream #1:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 640x480, 147456
kb/s, 30 fps, 30 tbr, 1000k tbn, 1000k tbc
Output #0, ffm, to 'http://somewhere.org:5430/test.ffm':
    creation_time   : now
    encoder         : Lavf55.43.100
    Stream #0:0: Audio: aac (libfdk_aac), 44100 Hz, stereo, s16, 128 kb/s
      encoder         : Lavc55.66.100 libfdk_aac
    Stream #0:1: Video: msmpeg4v2 (MP42 / 0x3234504D), yuv420p, 640x480, q=2-31,
320 kb/s, 30 fps, 1000k tbn, 30 tbc
      encoder         : Lavc55.66.100 msmpeg4v2
Stream mapping:
  Stream #0:0 -> #0:0 (pcm_s16le (native) -> aac (libfdk_aac))
  Stream #1:0 -> #0:1 (rawvideo (native) -> msmpeg4v2 (msmpeg4v2))
Press [q] to stop, [?] for help
[libfdk_aac @ 0xb8da260] Trying to remove 1024 samples, but the queue is empty
[ffm @ 0xb8d3b00] Encoder did not produce proper pts, making some up.
[libfdk_aac @ 0xb8da260] Trying to remove 1024 samples, but the queue is empty
qframe=    0 fps=0.0 q=0.0 Lsize=       8kB time=00:00:00.04
video:0kB audio:1kB subtitle:0kB other streams:0kB global headers:0kB muxing
overhead: 1002.557190%


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