[FFmpeg-devel] H264: mp4toannexb BSF and streaming

[Alexandre Ferrieux]

On 18/08/2010 15:33, Alexandre Ferrieux wrote:
>
> What I'm trying to do is understand where these "important" extradata
> are in the 3GP chunk hierarchy:
>
> - either they already in a separate chunk that is non-causal (comes at
> the end of the stream), and I'm doomed.
>

Further experiments with varied clip durations, sadly show that the above holds :(

Indeed, the produced .3gp files contain a few O(1) blocks (which deserve the name of 'header' or 'trailer'), but also 
unfortunately *two* O(N) blocks: 'mdat' for main bitstream, 'moov' for extradata. There being more than one toplevel 
chunk O(N) in size, with important data in both, wipes any hope of live streaming. Good job, whoever designed that :/

-Alex