[FFmpeg-devel] Stream h264 with FEC

Fce.Valeins fce.valeins
Wed Feb 20 09:23:19 CET 2008

Steven Ellis a ?crit :
> On Wed, February 20, 2008 06:54, Luca Abeni wrote:
>> Hi,
>> Fce.Valeins wrote:
>> [...]
>>>>>>> I have upload a sample file h264_rtp_stream_with_fec.raw in the ftp
>>>>>>> server upload.mplayerhq.hu.
>>>>>> Since I see the word "rtp" in it, I am interested in this sample...
>>>>>> But I do not know how to access samples stored in upload.mplayerhq.hu
>>>>>> (I tried to log on the ftp server and to do a "get
>>>>> h264_rtp_stream_with_fec.raw",
>>>>>> but it did not work). Is there a standard procedure to get such
>>>>>> samples?
>>>>> You can download it here
>>>>> http://www.zshare.net/download/781125504afb51/
>> Thanks, I downloaded it and had a look.
>>> Thanks, I have download wireshark and for rtp it use rtpdump. What is
>>> the best format for dump rtp with rtpdump ?
>>> In the help of rtpdump I have the choice between
>>> format : hex|ascii|rtcp|short|payload|dump|header
>>> Usage: ./rtpdump [-F [hex|ascii|rtcp|short|payload|dump|header] [-t
>>> minutes] [-o outputfile] [-f inputfile] [-x bytes] [multicast]/port >
>>> file
>>> Tonight I will try the dump format of rtpdump tool
>> After looking at the file, I do not think a network dump is needed: I
>> checked the TS continuity counter, and there are no discontinuities
>> corresponding to the video artefacts. So, I believe packet loss is
>> not the issue.
>> I think that the problem is not due to RTP, but to the fact that the
>> video stream uses some H.264 feature that is not fully supported by
>> libavcodec. I do not know the H.264 codec enough to help, sorry...
> I've just taken a look at your sample with a clean SVN build of ffmpeg. It
> appears you have the same artifact issues that I'm seeing with the test
> DTT H.264 transmissions here in NZ. It would appear that the ffmpeg
> implementation of PAFF + spatial direct isn't complete.
> Steve

Thanks Steve and Luca

Just asking for Luca. When I sniff network wireshark saw no rtp but just
packages ADP on port 8200 and the five packages ADP there is a UDP
packet on port 8202.

Does this corresponds to a transmission RTP ?

I you need more samples of the artifact I can download for you



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