[Live-devel] stream m4e

[Brad Bitterman]

Oh! I think I know exactly what your seeing. I have seen this before  
many times with VLC. What happens for me is that the time between i- 
frames is very long. When I connect with VLC i only get p-frames for a  
while. The green is because the initial decoded picture buffer in VLC  
is filled with all zeros which in YUV land is green. The little shapes  
you see are the motion vectors that are being decoded against the  
green buffer.

How long is the clip you captured? What is the key frame interval set  
to on the Axis camera?

- Brad

On Mar 31, 2009, at 4:24 PM, York Sun wrote:

> Brad,
>
> I should be clear about the color. It is not random color. It is all
> green, with a little bit shape here and there under vlc. mplayer shows
> most black.
>
> I think it is something related to multicast. Just found an old post  
> in
> archive
> http://lists.live555.com/pipermail/live-devel/2008-August/009323.html.
> Ross seems to believe the missing key frame causes the green.
>
> I tried live555MediaServer and it streams OK.
>
> Here is what I am trying to do. I want to capture rtsp steams from
> multiple IP cameras (MPEG4 or H.264), save the stream to the hard  
> drive,
> and also re-stream the video to unicast and/or multicast addresses.  
> I am
> hoping I can use the openRTSP and testMPEG4VideoStreamer as template  
> and
> put them together. Now it seems to be a little bit difficult for
> multicasting. Please advise if it is even possible, or someone already
> did it.
>
> Thanks,
>
> York
>
>
> On Tue, 2009-03-31 at 15:49 -0400, Brad Bitterman wrote:
>> Not sure what would cause a color issue like what you're
>> describing.... Live555 doesn't modify the frame data in any way so
>> chroma info should not be modified.
>>
>>
>> - Brad
>>
>> On Mar 30, 2009, at 10:34 PM, sun york-R58495 wrote:
>>
>>> Thanks for the hint. vlc can play the file with .m4v extension. That
>>> at least proves the openRTSP works OK. I still don't know why
>>> testMPEG4VideoStreamer sends the vague picture with wrong color. Is
>>> it resolution issue? The sample para.m4e file streams OK. It has low
>>> resolution, though.
>>>
>>> York
>>>
>>>
>>>
>>> -----Original Message-----
>>> From: live-devel-bounces at ns.live555.com on behalf of Brad Bitterman
>>> Sent: Mon 3/30/2009 19:51
>>> To: LIVE555 Streaming Media - development & use
>>> Subject: Re: [Live-devel] stream m4e
>>>
>>> You can use ffmpeg to wrap the file into a mp4 container. I think
>>> the
>>> command is just the following:
>>>
>>> ./ffmpeg -i video-MP4V-ES-1 out.mp4
>>>
>>> You should then be able to open the file with VLC. Also, ffmpeg
>>> will
>>> usually tell you if there are problems with the bitstream. I have
>>> also
>>> just renamed the file with a .m4v extension and VLC can play it
>>> directly without any container.
>>>
>>> I have used openRTSP in the past to capture a stream from an Axis
>>> camera and it worked fine. You might also want to turn the debug
>>> log
>>> level up in vlc and see if it reports any errors.
>>>
>>> - Brad
>>>
>>> On Mar 30, 2009, at 5:58 PM, York Sun wrote:
>>>
>>>> I am new to this list. Tried to search the archive but didn't find
>>> a
>>>> good way.
>>>>
>>>> In short, I have difficulty to stream m4e by
>>> testMPEG4VideoStreamer.
>>>> The
>>>> m4e comes from openRTSP (renamed from video-MP4V-ES-1), captured
>>>> from my
>>>> Axis camera, 640x480. I can see the picture with wrong color. vlc
>>> and
>>>> mplayer display different wrong color. I don't know which part is
>>>> wrong.
>>>>
>>>> More info, if adding -i or -4 to openRTSP, the avi or mp4 file can
>>> be
>>>> correctly played by vlc and mplayer. I don't know how to verify
>>> the
>>>> m4e
>>>> file. I can stream the sample para.m4e file. Only the very
>>> beginning
>>>> shows wrong color.
>>>>
>>>> Any help is appreciated.
>>>>
>>>> York
>>>>
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>>>> http://lists.live555.com/mailman/listinfo/live-devel
>>>
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>>>
>>>
>>>
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>>
>>
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