On Sunday 27 June 2010 17:56:06 Marko Ristola wrote: > 27.06.2010 15:37, Oliver Endriss wrote: > > Hi, > > > > On Sunday 27 June 2010 01:05:57 Jaroslav Klaus wrote: > > > >> Hi, > >> > >> I'm loosing TS packets in my dual CAM premium TT S-2300 card (av7110+saa7146). > >> > >> I use dvblast to select 4 TV channels (~ 16 PIDs) from multiplex, > >> descramble them and stream them to network. Dvblast reports TS > >> discontinuity across all video PIDs only (no audio) usually every > >> 1-3 minutes ~80 packets. But sometimes it goes well for tens of > >> minutes (up to 1-2hours). Everything seems to be ok with 3 TV channels. > >> > >> > > The full-featured cards are not able to deliver the full bandwidth of a > > transponder. It is a limitaion of the board design, not a firmware or > > driver issue. > > > I noticed that saa7146 uses dvb_dmx_swfilter_packets(). Yes. > I planned using of that function too for > Mantis 16K buffer delivery, but I found out that > hardware delivers sometimes additional bytes (corrupted partially lost > packets?) > between the full sized 204 byte packets: > > Jun 26 16:20:37 koivu kernel: demux: skipped 49 bytes at position 3379 > Jun 26 16:20:37 koivu kernel: demux: skipped 18 bytes at position 9868 > Jun 26 16:20:37 koivu kernel: demux: skipped 30 bytes at position 10090 > Jun 26 16:20:38 koivu kernel: demux: skipped 14 bytes at position 7208 > Jun 26 16:20:38 koivu kernel: demux: skipped 114 bytes at position 7426 Are you sure that Mantis driver delivers garbage, not partial packets? Please note that the dvb_dmx_swfilter[_204]() routines must accept partial packets, i.e. the rest of the packet will be dellivered with the next call. > So dvb_dmx_swfilter(_204)() is needed to skip > these unwanted bytes. With simple usage of > dvb_dmx_swfilter_packets() the rest of the buffer > would have been lost. I wrote a faster version of these > functions, also for 188 sized packets today: > "Re: [PATCH] Avoid unnecessary data copying inside > dvb_dmx_swfilter_204() function" dvb_dmx_swfilter_packets() expects complete TS packets from the driver. The saa7146 does so. It does not deliver garbage data. (Otherwise this would have been noticed a long time ago. The ttpci drivers are the oldest DVB drivers and are very well tested.) CU Oliver -- ---------------------------------------------------------------- VDR Remote Plugin 0.4.0: http://www.escape-edv.de/endriss/vdr/ 4 MByte Mod: http://www.escape-edv.de/endriss/dvb-mem-mod/ Full-TS Mod: http://www.escape-edv.de/endriss/dvb-full-ts-mod/ ---------------------------------------------------------------- -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
