[vlc-devel] Re: multiple slices issue in h264 streaming: marker bit problem
braymond at echostorm.net
Thu Dec 28 04:14:06 CET 2006
The spec allows for more then one NAL unit per RTP packet, which
makes sense for efficiency sake. Off the top of my head I cannot say
how many modes are supported but I do recall a couple of different
aggregation modes allowing multiple NALUs per RTP packet.
On Dec 27, 2006, at 9:18 AM, Yao Peter wrote:
> Sorry, I missed something here. The VLC code also have problem on
> NAL packetizing. It should split NALs in rtp_packetize_h264 so that
> an RTP packet does not includes more than 1 NAL units and their
> start codes.
> Yao Peter 写道:
>> Yes, I did check that setting the bit right does fix the issue.
>> The sample clip I used was sample_h264_100kbit.mp4 which was part
>> of Darwin Streaming Server code. It has 2 clips in every frame,
>> before the patch only the first one is displayed well, after that
>> both are ok.
>>> Have you checked (experimentally) that setting the marker bit at
>>> the right places does fix the issue?
>>> It seems to me that the rtp packetizer code here will misbehave
>>> even more than just the marker bit if you have more than one NAL
>>> per frame. I do not have a sample stream here that I know has
>>> this property, and I'm not familiar enough with the encoding
>>> tools to create such a stream easily, so I'll
>>> need a new sample in order to investigate further.
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