[vlc-devel] Re: Adding support for playing H.264 streams

[Nico Sabbi]

Erik Hellerud wrote:

> Ross Finlayson wrote:
>
>> At 11:43 AM 4/25/05, you wrote:
>>
>>>  How did the implementation of h264 in
>>> live.com end up? I heard that it, unlike other codecs in live.com 
>>> didn't
>>> return complete frames
>>
>>
>> Erik, is this still the case?  (I haven't looked at your 
>> "H264VideoRTPSource" code in detail.)
>
>
> My idea was to let H264VideoRTPSource return complete NAL units, not 
> complete frames. This is because each NALU should be independently 
> decodeble. Also, ffmpeg only support the optional H.264 Annex B 
> bytestream format, and thats why all the startcodes needs to be added. 
> In addition to that, the STAP-A payload type is difficult to handle in 
> live.com, so this has to be done in VLC. I haven't tried it, i just 
> disabled that payload type in mp4creator.


not at all, ffh264 also decodes NAL-stream H264, but you may or may not 
need a small patch that I posted in ffmpeg-devel a
couple of weeks ago to discard NALs until the first IDR arrives.
It only needs the codecdata filled with SPS+PPS.


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