Re: em28xx_isoc_dvb_max_packetsize for EM2884 (Terratec Cinergy HTC Stick)

Malcolm Priestley
2011-12-25T19:43:14Z

On Sun, 2011-12-25 at 15:11 +0100, Hans Petter Selasky wrote:
> On Sunday 25 December 2011 15:04:17 Dennis Sperlich wrote:
> > On 25.12.2011 11:52, Mauro Carvalho Chehab wrote:
> > > On 24-12-2011 19:58, Dennis Sperlich wrote:
> > >> Hi,
> > >>
> > >> I have a Terratec Cinergy HTC Stick an tried the new support for the
> > >> DVB-C part. It works for SD material (at least for free receivable
> > >> stations, I tried afair only QAM64), but did not for HD stations
> > >> (QAM256). I have only access to unencrypted ARD HD, ZDF HD and arte HD
> > >> (via KabelDeutschland). The HD material was just digital artefacts, as
> > >> far as mplayer could decode it. When I did a dumpstream and looked at
> > >> the resulting file size I got something about 1MB/s which seems a
> > >> little too low, because SD was already about 870kB/s. After looking
> > >> around I found a solution in increasing the isoc_dvb_max_packetsize
> > >> from 752 to 940 (multiple of 188). Then an HD stream was about 1.4MB/s
> > >> and looked good. I'm not sure, whether this is the correct fix, but it
> > >> works for me.
> > >>

Would not increasing EM28XX_DVB_NUM_BUFS currently set at 5 to say 10
have a better effect?

Malcolm