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Topic # 27357 23-Oct-2008 09:55
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I capture DVB-T TV3 broadcasts using gbpvr and a Hauppauge WinTV Nova 500 card (something like that). I use an external antenna pointed at Kau Kau

Recordings are fine played back on my Popcorn Hour (no ability yet to watch in real time but that's no bid geal) with little or no pixellation etc.

However if I try to post process the files to reduce their size I encounter AC-3 data errors. Viz.

Demux the video and audio and compress the video. Mux the original AC-3 stream back. Using txremuxer or mkvmerge I regularly encounter AC-3 frame errors and loss of sync in the output file. Since the original files playback fine, possibly the various players handle these errors okay but once you try to process the data, they surface to haunt you :(

Since it's random I can only guess it must be transmission artifacts but wonder what others are encountering (if at all). Makes it really hard to compress the video and get something useful at the output side.

Thanks

Larry




System One: Popcorn Hour A200,  PS3 SuperSlim, NPVR and Plex Server running on Gigabyte Brix (Windows 10 Pro), Sony BDP-S390 BD player, Pioneer AVR, Raspberry Pi running Kodi and Plex, Panasonic 60" 3D plasma, Google Chromecast

System Two: Popcorn Hour A200 ,  Oppo BDP-80 BluRay Player with hardware mode to be region free, Vivitek HD1080P 1080P DLP projector with 100" screen. Harman Kardon HK AVR 254 7.1 receiver, Samsung 4K player, Google Chromecast

 


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  Reply # 173105 23-Oct-2008 16:26
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i found that with HD Olympics stuff off TVNZ, the moment you tried to re-encode files with errors, it'd just bail, this was using MediaCoder.

I guess we've got to wait for someone like VideoReDo to release their MPEG4 editor.



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  Reply # 173172 23-Oct-2008 20:11
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I have the technology to make it work, if the AC-3 streams have no CRC errors in them. But they and are random. So far the only (cross my fingers!) process that seems repeatable is to break up the file into segments between ad breaks. Then compress each segment, mux it back with the audio and mux into a a MKV container. Then I can join the MKV files together. It's pretty laborious.

Annoyingly, if the audio has no CRS errors (and I have been lucky once or twice) the process is as simple as demux the video, compress it with x264, mux it back with the audio and then cut out the ads.

Still for me it's more an academic exercise than anything else since I felt it better to not compress the files and bought another 500G drive to store them!




System One: Popcorn Hour A200,  PS3 SuperSlim, NPVR and Plex Server running on Gigabyte Brix (Windows 10 Pro), Sony BDP-S390 BD player, Pioneer AVR, Raspberry Pi running Kodi and Plex, Panasonic 60" 3D plasma, Google Chromecast

System Two: Popcorn Hour A200 ,  Oppo BDP-80 BluRay Player with hardware mode to be region free, Vivitek HD1080P 1080P DLP projector with 100" screen. Harman Kardon HK AVR 254 7.1 receiver, Samsung 4K player, Google Chromecast

 


My Google+ page 

 

 

 

https://plus.google.com/+laurencechiu

 

 


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