Folks,
Would really appreciate some help here, since we are unable to proceed with testing our RTSP server serving MP4 hinted files. I am adding some more queries here. If this mail does not belong here in this forum (which could probably explain the pointed silence to my queries!!!), please do forgive me & point me to the right forum.
1) QT is apparently not able to recognize the format of the streams being played. The presentation is being played to the full with no output either audio/visual, with the Movie-Info window reflecting ", 160 X 120, Unknown" corresponding to the "Format" column. Whether QT depends on the receipt of media-packets at the intended-rate in order to reflect the Movie-Info as appropriately??. Whether the set of SDP parameters sent alongwith the DESCRIBE-response message from the Server's end wont be sufficient to reflect this info??.
2) What will be the effect of imposing a substantially high amount of delay[at the server's end] during the start of a presentation, i.e., just before streaming the very first packet from the Server's end ??. Similarly what will be the effect of a lack of sufficient delay that is supposed to precede the streaming of the very first media-packet ??. Whether QT is sensitive to these parameters ??. If so, what are the means to identify these parameters, at the Server's end ??.
Aside from this, are there any other players (Windows based) which support streaming (RTSP/RTP) and play back hinted MP4 files??
Thanks,
Kind Regards,
Sachin.
-----Original Message-----
From: sachin prahladarao
Sent: Tue 9/10/2002 2:45 PM
To: Chris LeCroy
Cc: email@hidden
Subject: RE: Mysteries of QT 6.0
Well, the RTSP server resides on 10.114.11.180 & the URLs we have tried are of the format:
rtsp://10.114.11.180/xxxxx.mp4, where xxxxx is the file name.
The funny thing is most of the files which QT is unable to play back can be easily decoded for their SDP details using some of the tools which DSS provides (viz. QTSDPGen). Am i missing something here??
The other thing is that these very same files are being played back admirably clearly using a freely available Linux tool called "mp4player" available from MPEG4IP. So , the fact that QT 6.0 is unable to play back these files is very puzzling.
One other thing i should mention is that i have noticed even the most minutest jitter in inter-packet despatch times (from the normal playback speed for the file) causes QT to totally miss out on the formats of the file. The server we have coded is still not the most accurate in terms of inter-packet delays. Is QT really so delicate & if so could this be the problem??
Thanks & appreciate the help,
Kind Regards,
Sachin.
-----Original Message-----
From: Chris LeCroy [mailto:email@hidden]
Sent: Mon 9/9/2002 11:14 PM
To: sachin prahladarao
Cc: email@hidden
Subject: Re: Mysteries of QT 6.0
Most/all of what you describe should have worked. Can you tell what
sort of URL you're using in the player?
-C
--
Chris LeCroy <email@hidden>
Internet & Streaming Server Engineering
Apple
On Sunday, September 8, 2002, at 07:42 AM, sachin kumar prahladarao
wrote:
> I have been trying to figure out the peculiarities of the way QT 6.0
> handles streaming media. We are trying to test a home-grown RTSP/RTP
> server serving MP4 hinted files with QT 6.0 playing the role of the
> client.
> Using "mp4creator" i hinted files of type "divx", & "avi". I then
> served these files over RTSP/RTP to the QT 6.0 client, & strangely
> enough QT 6.0 is unable to recognise the media type (when i click on
> "Media info")& also does not pop-up a new window, but the play bar
> still moves.
> Thinking that this could be a problem with our server, i served these
> same files using DSS & the same thing happened, no output & no media
> type recognition. In fact i tried hinting files of type MP3, & still
> QT is not able to recognise the media type or play back the file. In
> fact the only hinted file i could serve were the sample files provided
> with DSS ("sample_100kbit.mp4").
> Anyone out there could tell me what formats of files can QT 6.0
> handle, i would really appreciate some help here, or do i need to
> download some codecs as plugins to handle divx or avi files converted
> to MP4??
> Thanks,
> Kind Regards,
> Sachin.
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