[Ffmpeg-devel] H264 RTP + quicktime

Fri Nov 3 17:38:38 CET 2006

Jerry--

If I'm understanding you right, I think the problem is just that  
QuickTime buffers, so that it has some buffer room in case of network  
hiccups.  This MAY be affected by the connection speed preference in  
the QuickTime preferences.

I don't know if it's possible to tell QT to not do this.

Not sure your application, but I'm doing rtsp/h264 streaming, and I  
don't care;  sure, the vlc player is out of whack with the quicktime  
player, but since they aren't next to each other, I don't care.  If I  
need to sync something to the stream, I can use the timestamps in the  
rtcp packets, and they will be synced.

Just my 2 cents.

-Ryan

On Nov 3, 2006, at 9:46 AM, Jerry Johns wrote:

> Your brilliant! Thanks derk, it worked like a charm
> They key phrase in your email was the encoding of the SPS+PPS in  
> the sdp
>
> Now I seem to see one problem with my stream - when I play with  
> VLC, I've
> set the RTSP latency to about 150ms, and on a 4Mb/s stream it has  
> no dropped
> frames and its very smooth and 'real time'
>
> With quicktime, even though I adjusted the streaming settings to  
> the lowest
> latency, it still has about a 4 second latency when playing it back!
>
> Is it something to do with my SDP? I'm using payloadformatype of 96
> Does the type affect this?
>
> This is my SDP
>
> m=video 16666 RTP/AVP 96
> c=IN IP4 232.197.14.24/255
> a=rtpmap:96 H264/90000
> a=fmtp:96
> packetization-mode=1;profile-level-id=42801E;sprop-parameteter- 
> sets=Z0KAHo2M
> QFoeiA==,aM44gA==
>
> Thanks
>
>
> -----Original Message-----
> From: Derk-Jan Hartman [mailto:hartman at videolan.org]
> Sent: Thursday, November 02, 2006 4:52 PM
> To: FFmpeg development discussions and patches
> Cc: Jerry Johns
> Subject: Re: [Ffmpeg-devel] H264 RTP + quicktime
>
>
> On 2-nov-2006, at 22:15, Jerry Johns wrote:
>
>> My Framer that I developed follows the RFC spec for H264 closely
>> (using non
>> interleaved, FUA Fragmenting, chopping up on NAL units)
>>
>> However, I cant even get my base H264 file without streaming on to
>> play in
>> quicktime; the only way I can play it is if I wrap it in MP4 using
>> mp4box,
>> And then it plays like a charm
>
> Well, then it's not a RTP stream anymore is it ? It's a file.
>
>> I have tried opening my stream with quicktime, doesn't work neither
>>
>> The only way around is it to use MP4 RTP streaming, in which case
>> I'll have
>> to wrap my data into mdat, moov, etc. atoms in the container and
>> that's
>> where I need the help
>
> Non-sense. such a thing does not exist. There is something called QT
> RTP streaming, but I wouldn't advice on using it. It only works on
> mp4 and mov files. The documentation for QuickTime RTP framing is
> available somewhere on the Apple developers site. But I reiterate,
> there is no reason why you would need to use this, FU-A H264
> streaming to QuickTime works just fine.
>
> I suspect you are not properly reporting the SPS/PPS in the SDP.
> This is the a=packetization-mode=1,profile-level-id=######,sprop-
> parameter-sets=binarydata
> lines in your SDP.
>
> This is CRITICAL in getting your RTSP/RTP stream to work in QuickTime.
>
>> I need to know how the MP4 file is chopped up into RTP packets (I
>> wish there
>> was an RFC spec for this that shows it as clearly as the H264 spec)
>> -----Original Message-----
>> From: Derk-Jan Hartman [mailto:hartman at videolan.org]
>> Sent: Thursday, November 02, 2006 4:08 PM
>> To: FFmpeg development discussions and patches
>> Cc: Jerry Johns
>> Subject: Re: [Ffmpeg-devel] H264 RTP + quicktime
>>
>> On 2-nov-2006, at 16:42, Jerry Johns wrote:
>>> I've already gotten a H264 Framer + RTP packetizer working, and it
>>> streams
>>> absolutely well to a VLC Client, and plays without a hitch;
>>>
>>> My next step is to get this to work in quicktime, and that's where
>>> I need
>>> the mp4 container to work
>>
>> Why? RTP has nothing to do with mp4 file muxing. If you can stream to
>> VLC, you should be able to stream to QuickTime.
>> That is:
>>
>> 1 as long as you don't use any of the h.264 codec options that QT
>> doesn't support (QT doesn't support H264 very well)
>> 2 you write the SPS/PPS to the SDP file
>> 3 you only use 1 slice (at least i haven't been able to use more than
>> 1 slice when doing VLC h264 RTSP to quicktime. If someone figures out
>> why, i'm all ears).
>>
>>> The ISO files you mention, I cant seem to download them as I don't
>>> have
>>> access to them
>>
>> Then you'll just have to look around very hard for someone who
>> accidently left them somewhere, or pay up the fee that is required to
>> read/use this standard.
>>
>>> What I now need to do is a)find out general info on the MP4
>>> container and
>>> b)how it relates to the H264 stream and c)streaming MP4 over RTP
>>
>> See above.
>>
>> DJ
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