[Ffmpeg-devel] error, non monotone timestamps

[yi li]

After changing the  "FileMaxSize 5M" in "Feed" definition to "FileMaxSize
1M" the ffserver works properly now. There looks some bugs there, but not
found out yet.

I am wondering whether "ffserver" is just intended to be used as a
"prototype" or a testing tool for the Ffmpeg project? I used VLC for video
capture but I suffered from large latency (time between a frame been
caputured till a frame been sent to client for displaying). I tried
ffserver+ffmpeg, the latency is less, but ffserver is less stable.

-Yi

On 4/28/07, yi li <liyi.dev at gmail.com> wrote:
>
> Hi,
>
> I tried to do video streaming using SVN trunk ffserver and ffmpeg on a
> Blackfin board. I use ffmepg to capture video streams from a camera sensor:
>
> Here is the output:
> root:~> ffmpeg -f video4linux -s cif -r 15 -i /dev/video0 -an
> http://localhost:8090/feed1.ffm
> FFmpeg version SVN-r8802, Copyright (c) 2000-2007 Fabrice Bellard, et al.
>   configuration: --arch=bfin --cpu=bfin --cross-compile
> --cross-prefix=bfin-linux-uclibc- --target-os=linux --cc=gcc --enable-static
> --enable-gpl --enable-gpl --enable-pp --enable-swscaler --enable-vhook
> --disable-strip --disable-v4l2
>   libavutil version: 49.4.0
>   libavcodec version: 51.40.4
>   libavformat version: 51.12.1
>   built on Apr 28 2007 14:17:32, gcc: 4.1.1 (ADI 07R1)
> v4l: colour=61544 hue=0 brightness=0 constrast=279 whiteness=48878
> Input #0, video4linux, from '/dev/video0':
>   Duration: N/A, bitrate: 24330 kb/s
>   Stream #0.0: Video: rawvideo, rgb565, 352x288, 24330 kb/s, 15.00 fps(r)
> Output #0, ffm, to ' http://localhost:8090/feed1.ffm':
>   Stream #0.0: Video: mpeg4, yuv420p, 352x288, q=3-31, 256 kb/s, 15.00fps(c)
> Stream mapping:
>   Stream #0.0 -> #0.0
> [mpeg4 @ 0x120b170]removing common factors from framerate
> Press [q] to stop encoding
> [mpeg4 @ 0x120b170]rc buffer underflow
> frame=27391 fps= 15 q=2.0 Lsize=   23852kB time=1826.1 bitrate= 107.0kbits
> /s
> video:1535kB audio:0kB global headers:0kB muxing overhead 1454.338022%
>
> However, when the ffserver running for a few minutes, it will give "non
> monotone timestamps" error:
>
> root:~> ffserver -f /usr/ffserver.conf
> ffserver started.
> 127.0.0.1 - - [Thu Jan  1 00:52:56 1970] "GET /feed1.ffm HTTP/1.1" 200
> 4165
> 127.0.0.1 - - [Thu Jan  1 00:52:56 1970] "GET /feed1.ffm HTTP/1.1" 200
> 4165
> 10.99.22.134 - - [Thu Jan  1 00:53:44 1970] "GET /test.mpg HTTP/1.1" 200
> 6014
> error, non monotone timestamps 3445591663 >= 0 st:0
>
> I will have to remove /tmp/feed1.ffm and restart ffserver to make it work
> again.
> I've searched the list but cannot find any info. I am trying to debug,
> could anyone give some hints?
>
> Here is my ffserver.conf (snipped):
> (BTW, the "test.mpg" stream definition looks wierd (using "Format
> mpeg1video") , but that is the only way I can make it stream out MPEG4 video
> stream ;) )
>
> Port 8090
> BindAddress 0.0.0.0
> MaxClients 1000
> MaxBandwidth 20000
> CustomLog -
> NoDaemon
>
> <Feed feed1.ffm>
> File /tmp/feed1.ffm
> FileMaxSize 5M
> ACL allow 127.0.0.1
> </Feed>
>
> <Stream test.mpg>
> Feed feed1.ffm
> Format mpeg1video
> NoAudio
> VideoCodec mpeg4
> VideoFrameRate 15
> VideoBitRate 256
> VideoSize cif
> VideoBufferSize 40
> VideoGopSize 12
> #VideoQMin 25
> </Stream>
>
> Regards,
> -Yi