UK Freeview HD Soundtrack Conversion to AC3?

Ben Lumley · 2013-04-08T09:19:04+00:00

Hi, I'm trying to convert 5.1 UK Freeview HD recordings to an ac3 soundtrack, as my receiver can't handle HE-AAC/AAC. I've tried various things - handbrake...

Ben Lumley

Cropping - I've settled on no crop rather than doing it manually - handbrake's auto crop seems to lose the top/bottom bit of the frame, same as you are seeing.

ProfYaffle

FWIW, this seems to be the command line my current GUI profile is generating...

HandBrakeCLI.exe -i inputfile -t 1 -c 1 -o outputfile -f mkv --decomb -w 1920 --loose-anamorphic -e x264 -q 20 --cfr -a 2 -E copy -B 0 -6 auto -R Auto -D 0 --gain=0 --audio-copy-mask none --audio-fallback ffac3 -x b-adapt=2:rc-lookahead=50 --verbose=1

That works really well on SD/MPEG-2 files, and avoids any nasty combing artefacts due to interlacing. Perhaps 40% reduction in size plus I'd say the final image is better than the source because of some of the averaging-out over the macroblocks.

It doesn't do so much on OTA HD/H.264 sources since they're already pretty well compressed (it's more useful on BR rips where you can easily get a 60%+ filesize reduction with no discernible loss, even at lower RF values). It typically shrinks files by maybe 10%-20%, I think.

Ben Lumley

Ta for that - very similar to what I'm using. Will try the cfr option, see what difference it makes though.

On Friday, 12 April 2013 at 14:06, redmine@tvheadend.org wrote:

> Tvheadend - General: RE: UK Freeview HD Soundtrack Conversion to AC3? (https://tvheadend.org/d/1099-uk-freeview-hd-soundtrack-conversion-to-ac3?r=8249#message-8249) > Prof Yaffle
> FWIW, this seems to be the command line my current GUI profile is generating...
> HandBrakeCLI.exe -i inputfile -t 1 -c 1 -o outputfile -f mkv --decomb -w 1920 --loose-anamorphic -e x264 -q 20 --cfr -a 2 -E copy -B 0 -6 auto -R Auto -D 0 --gain=0 --audio-copy-mask none --audio-fallback ffac3 -x b-adapt=2:rc-lookahead=50 --verbose=1
> That works really well on SD/MPEG-2 files, and avoids any nasty combing artefacts due to interlacing. Perhaps 40% reduction in size plus I'd say the final image is better than the source because of some of the averaging-out over the macroblocks.
> It doesn't do so much on OTA HD/H.264 sources since they're already pretty well compressed (it's more useful on BR rips where you can easily get a 60%+ filesize reduction with no discernible loss, even at lower RF values). It typically shrinks files by maybe 10%-20%, I think.
> You have received this notification because you have either subscribed to it, or are involved in it.
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ProfYaffle

Another thought - I use StaxRip for BR encodes where I want to keep the HD audio stream, since Handbrake always transcodes these. I wonder if it would do a better job for you for these Freeview recordings?

It uses several common underlying tools - eac3to, x264 et al - but packages them in a pretty tidy front end.

Ben Lumley

Windows only I think? Come across it before, and eac3to, which otherwise

looked good.

I use a Mac and a headless ubuntu server, so not too handy for me.

On 14 Apr 2013 11:11, wrote:

> Tvheadend - General: RE: UK Freeview HD Soundtrack Conversion to AC3?
>Prof Yaffle >
> Another thought - I use StaxRip for BR encodes where I want to keep the HD
> audio stream, since Handbrake always transcodes these. I wonder if it would
> do a better job for you for these Freeview recordings?
>
> It uses several common underlying tools - eac3to, x264 et al - but
> packages them in a pretty tidy front end.
> ------------------------------
>
> You have received this notification because you have either subscribed to
> it, or are involved in it.
> To change your notification preferences, please click here:
> https://tvheadend.org/my/account >

ProfYaffle

Damn these operating system wars... whatever happened to POSIX? Can't bethat hard to update it for AV encoding ... :)

Yes, Windows-only, which is an increasing problem for me as the number of Linux derivatives proliferate in the house. So unless you want to bootcamp your machine or can do it as a VM (which is what I'm considering), I guess that's a dead end. Ah, well, it was worth a punt!

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