[Ffmpeg-devel] avformat/mpegts reads too much data for lowbitratestreams

Fabrice Bellard fabrice
Thu Jun 9 11:56:14 CEST 2005

M?ns Rullg?rd wrote:
> Sergio Garcia Murillo <sgm254 at tid.es> writes:
>>>I've been using libavformat/codec in an application in the 
>>>works for some time now, and one of the quirks I have come 
>>>across is that the mpegts format reader is searching across 
>>>WAY too many packets (MAX_SCAN_PACKETS) for a dvb specific 
>>>service description table. This table is not required in the 
>>>mpeg ts format, and is wrecking havock on my application when 
>>>trying to tune a radio service without this service table. As 
>>>a temporary workaround I've disabled the scan for sdt in 
>>>mpegts_read_header. Without this workaround, the live stream 
>>>that is to be decoded is delayed anywhere from 5-10 seconds 
>>>before packets starts to arrive for decoding..
>>I have the same problem, i was decoding an mpeg2 ts encoded 
>>with AVS at 200kbs and it never got played until i removed the
>>handle_packets call. Don't know if there is a better way of 
>>resolving the problem or not.
> If nobody objects soon I'll just go ahead and remove the SDT parsing,
> or at least make the search a bit less annoying.

I suggest that you keep the SDT parsing but that you look for it only in 
the first N bytes of the stream (where N is for example 4KB).


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