So way back at the end of September, just after the Plumbers Conference 2009 I mentioned on the blog that we were taking another look at the HVR1800 raw audio and VBI support. Well it took a little longer than expected but yesterday we posted a cx23885-audio tree that contains two sets of important changes.
1. It adds support for ALSA audio, applications that understand ALSA can now stream raw analog audio as well as raw analog video. (Remember that TVTime itself does NOT support ALSA directly. See Below). If you’re into recording TV audio then you’ll be happy about this.
2. It adds support for VBI CC closed captioning in the US, so applications like zvbi can decode the closed captions. (NOTE: TVTime is borked and causes massive video loss with drivers that don’t export buffers of 2048 bytes, so expect issues in TVTime). I know quite a few companies who are interested in CC capturing so this will benefit you.
The development work is mostly done but we do have a known issue, fix is pending. If you attempt to stream VBI before starting video then the driver can/will hang. This will be resolved very shortly. Fixed.
How can you help?
A. If you have applications that are ALSA aware (mencoder for example) and would like to experiment with this tree and post comments then we’d love to hear your feedback.
B. If you wish to experiment with TVTime (for video) and ‘arecord’ or ‘sox’ and other ALSA aware tools for testing then I’d love to hear your feedback. (Note: During my testing with sox and arecord the latency through the encoder caused a minor sync issue. I did not experience this with mencoder). (Please google for help if you’re not sure about these tools)
At this time we have not tested MythTV.
Lastly, if you just want to install the cx23885-audio tree and check your HVR1800 is still functional then tell us!
We need to strike while the iron is hot and get this tree fixed, tested and approved so we can get these into the mainline.
Footnote: This will also add audio support for the HVR1500 which I’m personally also planning to test.
Happy Thanksgiving everyone!