The VideoLAN Forums

Posted: **17 Nov 2005 22:52**

Hello
My vlc works fine with dvds.
But, when I try to watch tv, by selcting open capture device, I receive the error:

[00000269] v4l demuxer error: mmap unsupported

I use a pinnacle pctv usb2 tvcard with the v4l2 driver of video4linux. I use the modul em28xx.

Does anybody knows what this error means, or what I did wrong?

I use Fedora core 4 with the kernel 2.6.14

Laurent

Posted: **18 Nov 2005 20:30**

Hi,
this is supposed to mean that your v4l driver doesn't support the "mmap" API; do you have this problem only with vlc ?

Posted: **19 Nov 2005 09:28**

yes it is only with vlc. with oteher programs, like tvtime, xine and mplayer, I can see the images, but the sound doesn't work there too.

Posted: **19 Nov 2005 09:29**

the guest before was me, but I only forgot to add my username

Posted: **27 Nov 2005 21:39**

Hi,
this is supposed to mean that your v4l driver doesn't support the "mmap" API; do you have this problem only with vlc ?

Does anybody knows what I can do, if my driver doesn't support mmap API? any advice?

Posted: **10 Dec 2005 16:30**

cat /proc/asound/cards provides:

0 [I82801DBICH4 ]: ICH4 - Intel 82801DB-ICH4
Intel 82801DB-ICH4 with AD1981B at 0xc0000c00, irq 11
1 [Modem ]: ICH-MODEM - Intel 82801DB-ICH4 Modem

Why is my tv-card not listed?
any advice?

Posted: **13 Dec 2005 23:16**

When I use in mplayer the option immediatemode=0:

mplayer -zoom -tv driver=v4l2:amode=0:norm=PAL:outfmt=yuy2:forceaudio:immediatemode=0 tv://

Then I don't receive anymore the message no sound, but I still can't hear the sound. I receive the message:

Checking audio filter chain for 44100Hz/2ch/s16le -> 44100Hz/2ch/s16le...
AF_pre: 44100Hz/2ch/s16le
AO: [oss] 44100Hz 2ch s16le (2 bps)
Building audio filter chain for 44100Hz/2ch/s16le -> 44100Hz/2ch/s16le...
Starting playback...
A: 3.1 V: 2.3 A-V: 0.791 ct: 0.228 58/ 58 0% 0% 139.5% 50 0 0%
************************************************
**** Your system is too SLOW to play this! ****
************************************************
Possible reasons, problems, workarounds:
- Most common: broken/buggy _audio_ driver
- Try -ao sdl or use the OSS emulation of ALSA.
- Experiment with different values for -autosync, 30 is a good start.
- Slow video output
- Try a different -vo driver (-vo help for a list) or try -framedrop!
- Slow CPU
- Don't try to play a big DVD/DivX on a slow CPU! Try -hardframedrop.
- Broken file
- Try various combinations of -nobps -ni -forceidx -mc 0.
- Slow media (NFS/SMB mounts, DVD, VCD etc)
- Try -cache 8192.
- Are you using -cache to play a non-interleaved AVI file?
- Try -nocache.
Read DOCS/HTML/en/video.html for tuning/speedup tips.
If none of this helps you, read DOCS/HTML/en/bugreports.html.
v4l2: 1019 frames successfully processed, 8 frames dropped..4% 533 0 0%
Exiting... (Quit)

With the option -ao sdl I don't receive this message any more but my sound still doesn't work.
What else can I try now?