[Live-devel] stream m4e

[Patrick White]

It's been a while since I looked into these sorts of issues, but green is 
significant on YUV-encoded imagery, such as Jpegs, Mpeg4 and (I believe) 
H.264.  It often means the deocding failed and the max amount of blue & red 
are being subtracted from the resulting image, making it green (i.e. sick) :)

It's possible the key frame was missing or had a decode error and therefore 
green, and you're seeing deltas applied to that green key frame, hence the 
little bits of "shape".  Maybe some initialization data didn't make it?

Hope that's a useful little tidbit.

patbob


On Tuesday 31 March 2009 1:24 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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> > > > live-devel at lists.live555.com
> > > > http://lists.live555.com/mailman/listinfo/live-devel
> > >
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> > >
> > >
> > >
> > >
> > >
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> >
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