Re: [gst-embedded] Saving H.264 output into a format compatible with QuickTime

[Mark N. <ma...@sk...>]

Charles Woloszynski wrote:
> I am working to generate H.264 video clips using gstreamer and I want to
> use QuickTime as the playback engine.  
> 
> I used:
> 
> gst-launch videotestsrc pattern=1 num-buffers=60 !  TIVidenc1 codecName=h264enc engineName=codecServer ! qtmux ! filesink location=file
> 
> But, the output file is not correctly formatted.  I was told that the
> output of the TIVidenc1 is in a byte stream in NALU format, but the
> qtmux expects the video in packetized format with right codec_data (avcC
> atom) field information.
> 
> I am new to these formats, so I am looking for any pointers to help.  
> 
> First, is there a way to feed NALU directly into QuickTime?  

I would say that is the way given above, but the result would not be according
to any spec and it would be a matter of luck for anything to 'like it' that way.

> 
> Second, is there an existing tool to convert NALU into the right format
> (gstreamer plugin?)

A recent (git) version of h264parse should be able to do that (with properties
set properly; IIRC access-unit=true output-format=0)

> 
> Third, can someone help me understand these two formats (pointer to
> their definition?) so I can look into how to create a plugin to do this
> coversion?

The bytestream format is defined in the H264 spec (MPEG-4 part 10) Annex B.
The packetized format (AVC sample format) is defined in an MP4 file format spec
or so (IIRC MPEG-4 part 14 or 15).

Mark.

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