Great to hear. We'll dig in to testing this and report back with our findings and how we get along with the TS work.
-Jeff On Wed, Jul 15, 2009 at 3:42 AM, Andy Walls <[email protected]> wrote: > On Tue, 2009-07-14 at 19:30 -0700, Jeff Campbell wrote: > > Hi Andy and others, > > > > I've been away for a few months, but now that I've moved house and > > settled back in at my workbench I'll be back testing the cx18 under > > various conditions and hoping to provide useful feedback. > > > > I noticed the occasional red/grey screen issue with the CATV tuner > > appears to be resolved, based on list traffic, which is great. Good > > work. > > > > I wanted to understand the current status of the VBI/CC support. How > > is this looking? > > Jeff, > > It's done (mostly). Both PAL and NTSC, both sliced and raw, and sliced > VBI insertion into MPEG-2 PS-type streams ala ivtv (I need someone to > check to see if the PTS is correct for these though). Insertion into TS > streams in ivtv format is not available. > > Note the CX23418 firmware imposes a restriction that isn't in the > CX23415/6 firmware: an active video capture must be ongoing or VBI > capture stalls after 4 buffers. > > This means at a high level, a capture of VBI must be started this way: > > 1. Configure VBI settings > 2. Start video capture > 3. Start VBI capture > > Step 3 is handled internally by the cx18 driver, if ivtv format VBI > insertion into the MPEG2 PS-type stream is set. > > > > Note: Insertion into a TS stream would require some experimentation in > getting the CX23418 encoder to actually do the insertion vs. cx18 driver > software. > > If you really need sliced VBI insertion into a TS right away, I would > recommend doing it in userspace software that reads from both /dev/video > and /dev/vbi. The VBI buffers come once per video frame. Raw VBI > buffers from /dev/vbi have an incrementing 4 bytes "frame" counter at > the end of the buffer. Sliced VBI buffers from /dev/vbi don't have such > a counter, but also come at a rate of once per frame, and may contain > only 1 empty line if there is no VBI data for that frame. > > Regards, > Andy > > > Thanks, > > > > -Jeff > > >
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