[mythtv-users] Channel scanner won't find a specific channel

[Stuart Auchterlonie]

On 08/02/16 03:34, David Parker wrote:
> On Sun, Feb 7, 2016 at 6:55 PM, HP-mini <blm-ubunet at slingshot.co.nz
> <mailto:blm-ubunet at slingshot.co.nz>> wrote:
> 
>     The jitter is still too high even for the 30p "good" recording.
>     Your system does not seem to have enough I/O bandwidth.
>     Or your display refresh rate or resolution/mode is non-ideal.
>     Would need to see the whole FE log file.
> 
>     The original recording 18Mb/sec is on the high side.
> 
>     Can you use / try h/w assisted video decode?
> 
> 
> I'm not sure.  The video hardware in this box is an onboard Radeon HD
> 4200 and it's using the stock kernel driver.  I'll poke around and see. 
> I may need to install the proprietary ATI driver.
> 
>      
> 
>     Maybe mythtranscode is dropping the bitrate or changing slice refresh B
>     frames into I frames (never used it here, never had mpeg2 video).
>     Normal broadcast OTA digital has uniform bitrate (no I frame spikes).
> 
>     I'd follow Stuart's advise to check the playback jitterometer buffers..
> 
> 
> I played a good video and the bad video with the Playback Data OSD
> showing, and in both cases, everything matched what Stuart said it
> should be.  The info for the bad (stuttering) video is as follows:
> 
> Storage to Buffer: >1 Gbps
> Buffer to Decoder: (Ranging between 6.0 Mbps and 12.0 Mbps)
> Available Buffer: 99% of 4 Mb
> Video: 1280x720 at 59.94 fps
> Codec/Dec: MPEG-2 ffmpeg
> CPUs: (Averaging 8% on each of the 3 CPUs)
> FPS: (Ranging from 30-45 +/- 0.25-0.33)
> A/V Sync: (Ranging from 0.50-3.00)
> Frames decoded/free: 29/1
> Audio: AC3
> Channels: 6
> Sample rate: 48 kHz
> 
> So nothing stands out in the playback data except for the FPS, which is
> much lower than the 60 FPS it should be.
> 

What de-interlacer are you using?

Perhaps try with "none" and then some other variants

Regards
Stuart