[FFmpeg-user] Newbie streaming problem

Steven Occhipinti public at stevenocchipinti.com
Fri Oct 14 12:51:41 CEST 2011


Hi,

I had a look at v4lctl but other than setting attributes like contrast, etc.
I couldn't see any way of specifying inputs/outputs.

I've been playing around for a while, and then I came across this:
http://www.moreno.marzolla.name/software/camera_control/#using_webcam

Very similar situation to mine, so I grabbed this persons config file:
http://www.moreno.marzolla.name/software/camera_control/ffserver.conf

Then ran this command:
# ffserver -f ~/ffserver.conf & ffmpeg -v 2 -r 5 -s 640x480 -f video4linux2
-i /dev/video0 http://localhost:8090/webcam.ffm

And it started streaming!
It was really slow - but it was something!

The mjpeg stream was the fastest (just a refreshing jpeg in a webpage)
The asf stream has about 10 seconds lag
The flv stream I couldn't really test as I dont have a flash player.. yet.

Now I just have to work out how to speed this up!
I do eventually want this stream to be as cross-platform compliant as
possible.
(i.e. desktop and mobile web browsers, iphone apps, android apps, etc.)

Thank you very much for all your help and your patience, I really appreciate
it.



On Fri, Oct 14, 2011 at 1:28 AM, belcampo <belcampo at zonnet.nl> wrote:

> On 10/13/2011 02:35 PM, Steven Occhipinti wrote:
>
>> On Thu, Oct 13, 2011 at 3:03 AM, belcampo<belcampo at zonnet.nl>  wrote:
>>
>>  On 10/12/2011 02:07 PM, Steven Occhipinti wrote:
>>>
>>>  Thanks, must be close now.
>>>>
>>>> I thought the -an would be a little contradicting, but I tried removing
>>>> one
>>>> of the -map options instead of removing the -an option. Either way,
>>>> rearranging the options as you suggested helped, but I'm getting a
>>>> different
>>>> error now.
>>>>
>>>>  I'm no webcam/video4linux2 guru, so I'm guessing a little bit.
>>> Earlier you stated that you could create a playable mp4 with the command
>>>
>>>
>>> ffmpeg -an -f video4linux2 -s 320x240  -r 15 -i /dev/video0
>>> -vcodec mpeg4 -vtag DIVX /tmp/test.mp4
>>>
>>> Does the later used command also produce a playable file?
>>>
>>> ffmpeg -i /dev/video0 -vcodec mpeg4 -map 0.3 -map 0.2 -vtag DIVX -f
>>> video4linux2 -s 320x240 -r 15 /tmp/test.mp4
>>>
>>>  This does not produce a playable file, I get this error:
>>   [video4linux2 @ 0x823a2c0]Wrong size (0x0)
>>   /dev/video0: Error while opening file
>>
>>
>>  if not, maybe placing -f  video4linux2
>>> in front of -i makes a difference
>>>
>>>  I've found the -f video4linux2 must be before the -i /dev/video1,
>> otherwise
>> I get an "Unknown format" error.
>> That also matches other examples I have found.
>>
>> I was also getting a "Wrong size (0x0)" error, and so I have moved all
>> other
>> arguments between the -f and the -i to fix that.
>> After a fair amount of experimenting, this is the best I can come up with:
>>
>> # ffmpeg -f video4linux2 -s 320x240 -r 15 -vcodec mpeg4 -map 0.3 -map 0.2
>> -vtag DIVX -i /dev/video0 http://localhost:8090/feed1.**ffm<http://localhost:8090/feed1.ffm>
>> FFmpeg version SVN-r0.5.1-4:0.5.1-1ubuntu1.2, Copyright (c) 2000-2009
>> Fabrice Bellard, et al.
>>   configuration: --extra-version=4:0.5.1-**1ubuntu1.2 --prefix=/usr
>> --enable-avfilter --enable-avfilter-lavf --enable-vdpau --enable-bzlib
>> --enable-libgsm --enable-libschroedinger --enable-libspeex
>> --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib
>> --disable-stripping --disable-vhook --enable-runtime-cpudetect
>> --enable-gpl
>> --enable-postproc --enable-swscale --enable-x11grab --enable-libdc1394
>> --enable-shared --disable-static
>>   libavutil     49.15. 0 / 49.15. 0
>>   libavcodec    52.20. 1 / 52.20. 1
>>   libavformat   52.31. 0 / 52.31. 0
>>   libavdevice   52. 1. 0 / 52. 1. 0
>>   libavfilter    0. 4. 0 /  0. 4. 0
>>   libswscale     0. 7. 1 /  0. 7. 1
>>   libpostproc   51. 2. 0 / 51. 2. 0
>>   built on Sep 16 2011 17:04:18, gcc: 4.4.3
>> [video4linux2 @ 0x9b322d0][3]Capabilities: 4000001
>> [video4linux2 @ 0x9b322d0]The V4L2 driver changed the video from 320x240
>> to
>> 176x144
>> Input #0, video4linux2, from '/dev/video0':
>>   Duration: N/A, start: 1318508978.203480, bitrate: 6082 kb/s
>>     Stream #0.0: Video: mpeg4, yuyv422, 176x144, 6082 kb/s, 15 tbr, 1000k
>> tbn, 15 tbc
>> Number of stream maps must match number of output streams
>> ioctl(VIDIOC_QBUF)
>>
>>
>> I also experimented with different -map options, but no luck.
>> Is there a way I can ensure which streams need to set with -map.
>> The man page says it maps input streams to output streams, but it looks
>> like
>> there is only 1 input stream and 4 output streams.
>>
> The term stream confuses I think, you have 1 webcam which can produce 2
> video streams, and 2 audio streams, where the difference is the quaility.
> Video resolution of 320x240  or 176x144 and audio bitrate of 32kb/s or
> 64kb/s.
> Maybe, again I'm no webcam guru, you should have a look at the program
> v4l2-ctl to set the webcam in one of the different quality modes. After
> 'setting' this you only will have one video and one audio stream, which
> perhaps makes the map function obsolete. Give it a try, maybe it'll solve
> all or a few of the problems.
>
>>
>> Man page:
>> -map input_stream_id[:sync_stream_**id]
>>            Set stream mapping from input streams to output streams.  Just
>> enumerate
>>            the input streams in the order you want them in the output.
>> sync_stream_id
>>            if specified sets the input stream to sync against.
>>
>> It looks like it take input streams as argument, which I think I only have
>> 1
>> of.
>> When I run it without the -map options, it lists 1 input stream and 4
>> output
>> streams:
>> # ffmpeg -f video4linux2 -s 320x240 -r 15 -vcodec mpeg4 -vtag DIVX -i
>> /dev/video0 http://localhost:8090/feed1.**ffm<http://localhost:8090/feed1.ffm>
>> FFmpeg version SVN-r0.5.1-4:0.5.1-1ubuntu1.2, Copyright (c) 2000-2009
>> Fabrice Bellard, et al.
>>   configuration: --extra-version=4:0.5.1-**1ubuntu1.2 --prefix=/usr
>> --enable-avfilter --enable-avfilter-lavf --enable-vdpau --enable-bzlib
>> --enable-libgsm --enable-libschroedinger --enable-libspeex
>> --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib
>> --disable-stripping --disable-vhook --enable-runtime-cpudetect
>> --enable-gpl
>> --enable-postproc --enable-swscale --enable-x11grab --enable-libdc1394
>> --enable-shared --disable-static
>>   libavutil     49.15. 0 / 49.15. 0
>>   libavcodec    52.20. 1 / 52.20. 1
>>   libavformat   52.31. 0 / 52.31. 0
>>   libavdevice   52. 1. 0 / 52. 1. 0
>>   libavfilter    0. 4. 0 /  0. 4. 0
>>   libswscale     0. 7. 1 /  0. 7. 1
>>   libpostproc   51. 2. 0 / 51. 2. 0
>>   built on Sep 16 2011 17:04:18, gcc: 4.4.3
>> [video4linux2 @ 0x812c2d0][3]Capabilities: 4000001
>> [video4linux2 @ 0x812c2d0]The V4L2 driver changed the video from 320x240
>> to
>> 176x144
>> Input #0, video4linux2, from '/dev/video0':
>>   Duration: N/A, start: 1318509208.059178, bitrate: 6082 kb/s
>>     Stream #0.0: Video: mpeg4, yuyv422, 176x144, 6082 kb/s, 15 tbr, 1000k
>> tbn, 15 tbc
>> Output #0, ffm, to 'http://localhost:8090/feed1.**ffm<http://localhost:8090/feed1.ffm>
>> ':
>>     Stream #0.0: Audio: mp2, 44100 Hz, mono, s16, 32 kb/s
>>     Stream #0.1: Video: mpeg4, yuv420p, 176x144, q=3-31, 64 kb/s, 1000k
>> tbn,
>> 3 tbc
>>     Stream #0.2: Audio: mp2, 22050 Hz, mono, s16, 64 kb/s
>>     Stream #0.3: Video: msmpeg4, yuv420p, 352x240, q=3-31, 256 kb/s, 1000k
>> tbn, 15 tbc
>> Could not find input stream matching output stream #0.0
>> ioctl(VIDIOC_QBUF)
>>
>> These "streams" still confuse me :S
>>
>>
>>  So maybe try
>>>  ffmpeg -f video4linux2 -i /dev/video0 -vcodec mpeg4 -map 0.3 -map 0.2
>>> -vtag DIVX
>>> -s 320x240 -r 15 /tmp/test.mp4
>>>
>>>
>>  # ffmpeg -i /dev/video0 -vcodec mpeg4 -map 0.3 -map 0.2 -vtag DIVX -f
>>>> video4linux2 -s 320x240 -r 15 http://localhost:8090/feed1.****ffm<http://localhost:8090/feed1.**ffm>
>>>> <http://localhost:8090/**feed1.ffm <http://localhost:8090/feed1.ffm>>
>>>>
>>>> FFmpeg version SVN-r0.5.1-4:0.5.1-1ubuntu1.2, Copyright (c) 2000-2009
>>>> Fabrice Bellard, et al.
>>>>   configuration: --extra-version=4:0.5.1-****1ubuntu1.2 --prefix=/usr
>>>> --enable-avfilter --enable-avfilter-lavf --enable-vdpau --enable-bzlib
>>>> --enable-libgsm --enable-libschroedinger --enable-libspeex
>>>> --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib
>>>> --disable-stripping --disable-vhook --enable-runtime-cpudetect
>>>> --enable-gpl
>>>> --enable-postproc --enable-swscale --enable-x11grab --enable-libdc1394
>>>> --enable-shared --disable-static
>>>>   libavutil     49.15. 0 / 49.15. 0
>>>>   libavcodec    52.20. 1 / 52.20. 1
>>>>   libavformat   52.31. 0 / 52.31. 0
>>>>   libavdevice   52. 1. 0 / 52. 1. 0
>>>>   libavfilter    0. 4. 0 /  0. 4. 0
>>>>   libswscale     0. 7. 1 /  0. 7. 1
>>>>   libpostproc   51. 2. 0 / 51. 2. 0
>>>>   built on Sep 16 2011 17:04:18, gcc: 4.4.3
>>>> /dev/video0: Unknown format
>>>>
>>>>
>>>> Sorry to keep asking like this :(
>>>> I wouldn't have thought it would compain about "-f video4linux2" as that
>>>> was
>>>> one of the options I thought I got right initially when I recorded my
>>>> first
>>>> video clip.
>>>>
>>>> Any ideas?
>>>> I appreciate you help!
>>>>
>>>>
>>>> On Wed, Oct 12, 2011 at 1:42 AM, belcampo<belcampo at zonnet.nl>   wrote:
>>>>
>>>>  On 10/11/2011 12:15 PM, Steven Occhipinti wrote:
>>>>
>>>>>  On Tue, Oct 11, 2011 at 6:43 PM, belcampo<belcampo at zonnet.nl>
>>>>>  wrote:
>>>>>
>>>>>>  On 10/11/2011 04:26 AM, Steven Occhipinti wrote:
>>>>>>
>>>>>>>  Hi,
>>>>>>>
>>>>>>>> I'm pretty new to ffmpeg and am a little confused on how ffserver
>>>>>>>> works.
>>>>>>>> My goal is to stream a webcam from one machine to (one or more)
>>>>>>>> others.
>>>>>>>> Ideally I would want the client machine to only require a web
>>>>>>>> browser
>>>>>>>> and the basic plugins, etc. to view the stream.
>>>>>>>>
>>>>>>>> I have Ubuntu 10.04.3 server installed and ffmpeg/ffserver from the
>>>>>>>> repo.
>>>>>>>> If I run this command to test the webcam and it starts up and a
>>>>>>>> video
>>>>>>>> file is successfully recorded /tmp/test.mp4:
>>>>>>>>   #>      ffmpeg -an -f video4linux2 -s 320x240  -r 15 -i
>>>>>>>> /dev/video0
>>>>>>>> -vcodec mpeg4 -vtag DIVX /tmp/test.mp4
>>>>>>>> I copied /etc/ffserver.conf to my home dir - I think I need to tweak
>>>>>>>> this file a bit, but need a little help.
>>>>>>>> I ran this command and it started a server on localhost:8090
>>>>>>>>   #>      ffserver -f ~/ffserver.conf
>>>>>>>> I then ran
>>>>>>>>   #>      ffmpeg -an -f video4linux2 -s 320x240  -r 15 -i
>>>>>>>> /dev/video0
>>>>>>>> -vcodec mpeg4 -vtag DIVX http://localhost:8090/feed1.******ffm<http://localhost:8090/feed1.****ffm>
>>>>>>>> <http://localhost:8090/**feed1.**ffm<http://localhost:8090/feed1.**ffm>
>>>>>>>> >
>>>>>>>> <http://localhost:8090/****feed1.ffm<http://localhost:8090/**feed1.ffm>
>>>>>>>> <http://localhost:**8090/feed1.ffm<http://localhost:8090/feed1.ffm>
>>>>>>>> >>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> and this is the output I get:
>>>>>>>>
>>>>>>>>   #>      ffmpeg -an -f video4linux2 -s 320x240  -r 15 -i
>>>>>>>> /dev/video0
>>>>>>>> -vcodec mpeg4 -vtag DIVX http://localhost:8090/feed1.******ffm<http://localhost:8090/feed1.****ffm>
>>>>>>>> <http://localhost:8090/**feed1.**ffm<http://localhost:8090/feed1.**ffm>
>>>>>>>> >
>>>>>>>> <http://localhost:8090/****feed1.ffm<http://localhost:8090/**feed1.ffm>
>>>>>>>> <http://localhost:**8090/feed1.ffm<http://localhost:8090/feed1.ffm>
>>>>>>>> >>
>>>>>>>>
>>>>>>>>
>>>>>>>> FFmpeg version SVN-r0.5.1-4:0.5.1-1ubuntu1.2, Copyright (c)
>>>>>>>> 2000-2009
>>>>>>>> Fabrice Bellard, et al.
>>>>>>>>   configuration: --extra-version=4:0.5.1-******1ubuntu1.2
>>>>>>>> --prefix=/usr
>>>>>>>>
>>>>>>>>
>>>>>>>> --enable-avfilter --enable-avfilter-lavf --enable-vdpau
>>>>>>>> --enable-bzlib
>>>>>>>> --enable-libgsm --enable-libschroedinger --enable-libspeex
>>>>>>>> --enable-libtheora --enable-libvorbis --enable-pthreads
>>>>>>>> --enable-zlib
>>>>>>>> --disable-stripping --disable-vhook --enable-runtime-cpudetect
>>>>>>>> --enable-gpl --enable-postproc --enable-swscale --enable-x11grab
>>>>>>>> --enable-libdc1394 --enable-shared --disable-static
>>>>>>>>   libavutil     49.15. 0 / 49.15. 0
>>>>>>>>   libavcodec    52.20. 1 / 52.20. 1
>>>>>>>>   libavformat   52.31. 0 / 52.31. 0
>>>>>>>>   libavdevice   52. 1. 0 / 52. 1. 0
>>>>>>>>   libavfilter    0. 4. 0 /  0. 4. 0
>>>>>>>>   libswscale     0. 7. 1 /  0. 7. 1
>>>>>>>>   libpostproc   51. 2. 0 / 51. 2. 0
>>>>>>>>   built on Sep 16 2011 17:04:18, gcc: 4.4.3
>>>>>>>> [video4linux2 @ 0x89092c0][3]Capabilities: 4000001
>>>>>>>> [video4linux2 @ 0x89092c0]The V4L2 driver changed the video from
>>>>>>>> 320x240 to 176x144
>>>>>>>> Input #0, video4linux2, from '/dev/video0':
>>>>>>>>   Duration: N/A, start: 1318298315.446232, bitrate: 6082 kb/s
>>>>>>>>     Stream #0.0: Video: rawvideo, yuyv422, 176x144, 6082 kb/s, 15
>>>>>>>> tbr,
>>>>>>>> 1000k tbn, 15 tbc
>>>>>>>> Output #0, ffm, to 'http://localhost:8090/feed1.******ffm<http://localhost:8090/feed1.****ffm>
>>>>>>>> <http://localhost:8090/**feed1.**ffm<http://localhost:8090/feed1.**ffm>
>>>>>>>> >
>>>>>>>> <http://localhost:8090/****feed1.ffm<http://localhost:8090/**feed1.ffm>
>>>>>>>> <http://localhost:**8090/feed1.ffm<http://localhost:8090/feed1.ffm>
>>>>>>>> >>
>>>>>>>>
>>>>>>>>
>>>>>>>> ':
>>>>>>>>     Stream #0.0: Audio: mp2, 44100 Hz, mono, s16, 32 kb/s
>>>>>>>>     Stream #0.1: Video: mpeg1video, yuv420p, 176x144, q=3-31, 64
>>>>>>>> kb/s,
>>>>>>>> 1000k tbn, 3 tbc
>>>>>>>>     Stream #0.2: Audio: mp2, 22050 Hz, mono, s16, 64 kb/s
>>>>>>>>     Stream #0.3: Video: msmpeg4, yuv420p, 352x240, q=3-31, 256 kb/s,
>>>>>>>> 1000k tbn, 15 tbc
>>>>>>>> Could not find input stream matching output stream #0.0
>>>>>>>> ioctl(VIDIOC_QBUF)
>>>>>>>>
>>>>>>>>
>>>>>>>> I'm assuming I need to setup a more suitable<feed>      definition
>>>>>>>> to
>>>>>>>> match the input, but after some fiddling I can't seem to get it
>>>>>>>> working.
>>>>>>>>
>>>>>>>>  Your camera is providing 2 video and 2 audio streams you need to
>>>>>>>> use
>>>>>>>>
>>>>>>> the
>>>>>>> map
>>>>>>> function to make it work.
>>>>>>> Adding -map 0.3 -map 0.2 to your ffmpeg command line will choose the
>>>>>>> higher
>>>>>>> definition video and audio.
>>>>>>>
>>>>>>>  I've attached my ffserver.conf - Any help is much appreciated.
>>>>>>>
>>>>>>>>
>>>>>>>> Cheers,
>>>>>>>> Steve
>>>>>>>>
>>>>>>>>
>>>>>>>> ______________________________******_________________
>>>>>>>> ffmpeg-user mailing list
>>>>>>>> ffmpeg-user at ffmpeg.org
>>>>>>>> http://ffmpeg.org/mailman/******listinfo/ffmpeg-user<http://ffmpeg.org/mailman/****listinfo/ffmpeg-user>
>>>>>>>> <http://**ffmpeg.org/mailman/**listinfo/**ffmpeg-user<http://ffmpeg.org/mailman/**listinfo/ffmpeg-user>
>>>>>>>> >
>>>>>>>> <http://**ffmpeg.org/mailman/**listinfo/**ffmpeg-user<http://ffmpeg.org/mailman/listinfo/**ffmpeg-user>
>>>>>>>> <http://**ffmpeg.org/mailman/listinfo/**ffmpeg-user<http://ffmpeg.org/mailman/listinfo/ffmpeg-user>
>>>>>>>> >
>>>>>>>>  ______________________________******_________________
>>>>>>>>
>>>>>>> ffmpeg-user mailing list
>>>>>>> ffmpeg-user at ffmpeg.org
>>>>>>> http://ffmpeg.org/mailman/******listinfo/ffmpeg-user<http://ffmpeg.org/mailman/****listinfo/ffmpeg-user>
>>>>>>> <http://**ffmpeg.org/mailman/**listinfo/**ffmpeg-user<http://ffmpeg.org/mailman/**listinfo/ffmpeg-user>
>>>>>>> >
>>>>>>> <http://**ffmpeg.org/mailman/**listinfo/**ffmpeg-user<http://ffmpeg.org/mailman/listinfo/**ffmpeg-user>
>>>>>>> <http://**ffmpeg.org/mailman/listinfo/**ffmpeg-user<http://ffmpeg.org/mailman/listinfo/ffmpeg-user>
>>>>>>> >
>>>>>>>
>>>>>>>
>>>>>>>  Thanks for your prompt reply.
>>>>>>>
>>>>>> Your reply makes sense to me, but when I add those 2 map options, I
>>>>>> get this error:
>>>>>> "Number of stream maps must match number of output streams"
>>>>>>
>>>>>>  I think the order of options is important, try to change in something
>>>>>>
>>>>> like:
>>>>>
>>>>> ffmpeg -i /dev/video0 -vcodec mpeg4 -map 0.3 -map 0.2 -vtag DIVX -f
>>>>> video4linux2 -s 320x240 -r 15
>>>>> http://localhost:8090/feed1.******ffm<http://localhost:8090/feed1.****ffm>
>>>>> <http://localhost:8090/**feed1.**ffm<http://localhost:8090/feed1.**ffm>
>>>>> ><
>>>>> http://localhost:8090/**feed1.**ffm<http://localhost:8090/**feed1.ffm>
>>>>> <http://localhost:8090/**feed1.ffm <http://localhost:8090/feed1.ffm>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>  I tried just the video stream too, but that gives the same result..
>>>>>
>>>>>> what are the output streams?
>>>>>>
>>>>>> # ffmpeg -map 0.3 -map 0.2 -an -f video4linux2 -s 320x240  -r 15 -i
>>>>>> /dev/video0 -vcodec mpeg4 -vtag DIVX http://localhost:8090/feed1.****
>>>>>> ** <http://localhost:8090/feed1.****>
>>>>>> ffm<http://localhost:8090/**feed1.**ffm<http://localhost:8090/feed1.**ffm>
>>>>>> ><http://localhost:**8090/** <http://localhost:8090/**>
>>>>>> feed1.ffm<http://localhost:**8090/feed1.ffm<http://localhost:8090/feed1.ffm>
>>>>>> >>
>>>>>>
>>>>>>
>>>>>>  You choose 0.3 and 0.2 as input and therefore output,and then disable
>>>>>>
>>>>> audio
>>>>> with -an that won't work.
>>>>>
>>>>>  FFmpeg version SVN-r0.5.1-4:0.5.1-1ubuntu1.2, Copyright (c) 2000-2009
>>>>>
>>>>>> Fabrice Bellard, et al.
>>>>>>   configuration: --extra-version=4:0.5.1-******1ubuntu1.2
>>>>>> --prefix=/usr
>>>>>>
>>>>>>
>>>>>> --enable-avfilter --enable-avfilter-lavf --enable-vdpau --enable-bzlib
>>>>>> --enable-libgsm --enable-libschroedinger --enable-libspeex
>>>>>> --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib
>>>>>> --disable-stripping --disable-vhook --enable-runtime-cpudetect
>>>>>> --enable-gpl --enable-postproc --enable-swscale --enable-x11grab
>>>>>> --enable-libdc1394 --enable-shared --disable-static
>>>>>>   libavutil     49.15. 0 / 49.15. 0
>>>>>>   libavcodec    52.20. 1 / 52.20. 1
>>>>>>   libavformat   52.31. 0 / 52.31. 0
>>>>>>   libavdevice   52. 1. 0 / 52. 1. 0
>>>>>>   libavfilter    0. 4. 0 /  0. 4. 0
>>>>>>   libswscale     0. 7. 1 /  0. 7. 1
>>>>>>   libpostproc   51. 2. 0 / 51. 2. 0
>>>>>>   built on Sep 16 2011 17:04:18, gcc: 4.4.3
>>>>>> [video4linux2 @ 0x9ce02c0][3]Capabilities: 4000001
>>>>>> [video4linux2 @ 0x9ce02c0]The V4L2 driver changed the video from
>>>>>> 320x240 to 176x144
>>>>>> Input #0, video4linux2, from '/dev/video0':
>>>>>>   Duration: N/A, start: 1318328002.348537, bitrate: 6082 kb/s
>>>>>>     Stream #0.0: Video: rawvideo, yuyv422, 176x144, 6082 kb/s, 15 tbr,
>>>>>> 1000k tbn, 15 tbc
>>>>>> Number of stream maps must match number of output streams
>>>>>> ioctl(VIDIOC_QBUF)
>>>>>> ______________________________******_________________
>>>>>> ffmpeg-user mailing list
>>>>>> ffmpeg-user at ffmpeg.org
>>>>>> http://ffmpeg.org/mailman/******listinfo/ffmpeg-user<http://ffmpeg.org/mailman/****listinfo/ffmpeg-user>
>>>>>> <http://**ffmpeg.org/mailman/**listinfo/**ffmpeg-user<http://ffmpeg.org/mailman/**listinfo/ffmpeg-user>
>>>>>> >
>>>>>> <http://**ffmpeg.org/mailman/**listinfo/**ffmpeg-user<http://ffmpeg.org/mailman/listinfo/**ffmpeg-user>
>>>>>> <http://**ffmpeg.org/mailman/listinfo/**ffmpeg-user<http://ffmpeg.org/mailman/listinfo/ffmpeg-user>
>>>>>> >
>>>>>>  ______________________________******_________________
>>>>>>
>>>>> ffmpeg-user mailing list
>>>>> ffmpeg-user at ffmpeg.org
>>>>> http://ffmpeg.org/mailman/******listinfo/ffmpeg-user<http://ffmpeg.org/mailman/****listinfo/ffmpeg-user>
>>>>> <http://**ffmpeg.org/mailman/**listinfo/**ffmpeg-user<http://ffmpeg.org/mailman/**listinfo/ffmpeg-user>
>>>>> >
>>>>> <http://**ffmpeg.org/mailman/**listinfo/**ffmpeg-user<http://ffmpeg.org/mailman/listinfo/**ffmpeg-user>
>>>>> <http://**ffmpeg.org/mailman/listinfo/**ffmpeg-user<http://ffmpeg.org/mailman/listinfo/ffmpeg-user>
>>>>> >
>>>>>  ______________________________****_________________
>>>>>
>>>> ffmpeg-user mailing list
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>>>> http://ffmpeg.org/mailman/****listinfo/ffmpeg-user<http://ffmpeg.org/mailman/**listinfo/ffmpeg-user>
>>>> <http://**ffmpeg.org/mailman/listinfo/**ffmpeg-user<http://ffmpeg.org/mailman/listinfo/ffmpeg-user>
>>>> >
>>>>
>>>>
>>>  ______________________________**_________________
>> ffmpeg-user mailing list
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>>
>
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