[Ffmpeg-devel] decoding received H.264 stream

[Engin Kurutepe]

live media is a streaming library used by VLC among others. It  
provides RTP/RTSP/SDP etc. functionality for various video and audio  
standards: http://www.live555.com/

I have managed to get my streams decoded. I had to prepend the start  
code (0x000001) to the received NAL units to get avcodec_decode_video 
() to properly decode them. I can see how this makes for easier  
decoding of Annex.B format H.264 files but this actually slows  
decoding of NAL units received over RTP as defined in RFC 3984 where  
no start codes are used.

Audio is not an issue for me. I am trying to implement a streaming  
system for 3-D.

Thanks for you reply,
Engin.


On 16.02.2007, at 20:44, Ryan Martell wrote:

>
> On Feb 11, 2007, at 9:01 AM, Luca Barbato wrote:
>
>> Engin Kurutepe wrote:
>>> Dearl all,
>>>
>>> I am streaming h.264 video over RTSP/RTP using the live media  
>>> library. I
>>> have been trying for a week to decode the received NAL units using
>>> avcodec_decode_video() to no avail because I have not been able to
>>> properly initialize AVFormatContext and AVCodecContext instances.
>>>
>>> What is the proper way to make live media and ffmpeg work  
>>> together? does
>>> anybody have example code using RTSP (not necessarily live media)  
>>> with
>>> ffmpeg to get me started?
>>
>> Check vlc or gst they have a framer for h264 that are surely working
>> with streams from the darwinstreamingserver.
>>
>> The is code present as rtp_h264 in libavformat but I don't know if it
>> has been tested.
>
>
> The rtp_h264 stuff works with Darwin Streaming server.  There are  
> some audio sync issues if you are decoding a mono stream, but it's  
> more of a FAAD2 issue than an ffmpeg issue (faad upconverts, which  
> screws up the timestamps).
>
> -Ryan
>
> PS: What's the live media library?
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