Re: GSoC 2008 qualification task TS Muxer

Måns Rullgård schrieb:
> Baptiste Coudurier wrote:
>> Hi,
>>
>> I don't think extracting duplicated code from
mpegenc.c and mpegtsenc.c
>> is that hard. H264 muxing might be slightly harder.
> 
> Assuming the H264 data is correctly encoded for TS
muxing (i.e. has
> AUD NAL units and the like), it shouldn't be any harder
to mux than
> anything else.  All that's needed is a descriptor in
the PMT.  The
> PES packetisation is no different from MPEG2.
Just as reminder: you only have to handle the extra pitfalls
of PAFF
encoded h264: the stream timebase is e.g. 1/25 even if there
are 50
fields with PAFF, and there are 50 access units to mux.
Either the
bottom fields get same pts/dts as the top fields or +1/2
frame duration
- in that case it is harder to write the muxer.
As far as I know, the two fields of a PAFF-coded frame don't
need to be
consecutive in the stream, and can be mixed with other
frames - so its
hard to compute PTS/DTS for a bottom field. Using the values
from
av_interleaved_write_frame() or AVPacket the bottom field
will get the
same PTS/DTS as the topfield.

-- 
Regards, Thorsten
_______________________________________________
ffmpeg-devel mailing list
ffmpeg-develmplayerhq.hu
https://lists.mplayerhq.hu/mailman/listinfo/ffmpeg-devel

Hi,

Thorsten Jordan wrote:
> Måns Rullgård schrieb:
>> Baptiste Coudurier wrote:
>>> Hi,
>>>
>>> I don't think extracting duplicated code from
mpegenc.c and mpegtsenc.c
>>> is that hard. H264 muxing might be slightly
harder.
>> Assuming the H264 data is correctly encoded for TS
muxing (i.e. has
>> AUD NAL units and the like), it shouldn't be any
harder to mux than
>> anything else.  All that's needed is a descriptor
in the PMT.  The
>> PES packetisation is no different from MPEG2.
> Just as reminder: you only have to handle the extra
pitfalls of PAFF
> encoded h264: the stream timebase is e.g. 1/25 even if
there are 50
> fields with PAFF, and there are 50 access units to mux.
Either the
> bottom fields get same pts/dts as the top fields or
+1/2 frame duration
> - in that case it is harder to write the muxer.
> As far as I know, the two fields of a PAFF-coded frame
don't need to be
> consecutive in the stream, and can be mixed with other
frames - so its
> hard to compute PTS/DTS for a bottom field. Using the
values from
> av_interleaved_write_frame() or AVPacket the bottom
field will get the
> same PTS/DTS as the topfield.
> 

And here you scared everyone ;)

-- 
Baptiste COUDURIER                              GnuPG Key
Id: 0x5C1ABAAA
SMARTJOG SAS                                     http://www.smartjog.com
Key fingerprint                
8D77134D20CC9220201FC5DB0AC9325C5C1ABAAA
Phone: +33 1 49966312

_______________________________________________
ffmpeg-devel mailing list
ffmpeg-develmplayerhq.hu
https://lists.mplayerhq.hu/mailman/listinfo/ffmpeg-devel