On Tuesday 17 May 2005 21:08, Chris Kennedy wrote:
> Yes, Myth has an odd bug there, it sets the vbi-insertion on variable to
> the vbi passthrough value (which it happens not to set). So seems that
> causes it to choose the wrong type of insertion,should be '1' and
> then should set passthrough mode to 4 or whatever tv standard is being
> decoded to the VBI output.
>
> I fixed this right after my email and re-uploaded, but it may still
> get triggered on PAL systems I suspect since they may have passthrough
> modes less than 4, so triggers different insertion types. It's a
> nasty little bug there in Myth because we need to use the insertion
> variable, used to only be 0/1 for off/on, to do other types of insertion,
> yet it's confused that with the passthrough mode (which also needs to
> be set by the application and isn't, I now can see why Myth isn't
> setting that, because it thought the insertion ioctl variable was for
> that).
>
> I'm trying to think of some way to work around it for now, but really
> points to a bug which puts a burdon on us for setting up vbi insertion mode
> and making it logical to switch modes to other types.
>
>
> Thanks,
> Chris
What would you like to see changed in the ioctl in myth?
as part of the experimental teletext for IVTV cards, I already changed the
following in the mpegrecorder:
...
if (vbimode) {
� memset(&vbifmt, 0, sizeof(struct ivtv_sliced_vbi_format));
� vbifmt.service_set = (1==vbimode) ? IVTV_SLICED_TELETEXT_B :
IVTV_SLICED_CAPTION_525;
� if ((ioctl(chanfd, IVTV_IOC_S_VBI_MODE, &vbifmt) < 0) ||
� � � (ioctl(chanfd, IVTV_IOC_S_VBI_EMBED, &vbifmt) < 0))
...
As I use PVR250, I do not need passthough. But you probably need:
vbi_passthrough = (1 == vbimode) ? 0 : IVTV_SLICED_WSS_625;
ioctl(fd, IVTV_IOC_S_VBI_PASSTHROUGH, &vbi_passthrough) < 0)
does this solve your problem? We can submit some patches for mythtv to avoid
making work-arounds.
Martin
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