[mythtv-users] Question on recording sizes and DVD burning

[Henk D. Schoneveld]

You can do even better, encode-speed/size-wise, if you use anamorphic settings. The human eye is more sensitive to vertical then horizontal resolution. By using non-square dots, wider, you need less horizontal dots to encode. The original DVD/TV format uses that. 704 dots are displayed at a width of 1024, at least in Europe. I think is the US 720 is displayed at 854. https://trac.handbrake.fr/wiki/AnamorphicGuide
Knowing that this works well, one can change the settings in HandBrake or ffmpeg accordingly.
I encode 1080p stuff to 880x720 which will display at 1280x720 and encoding en size decreases with (1280-880)/1280 = 31.25%

Henk

On 22 Jan 2014, at 00:24, Peter Bennett (cats22) <cats22 at comcast.net> wrote:

> On 01/21/2014 11:32 AM, John Pilkington wrote:
>> Ok, Adding to my last post (sorry) I guess the reason it takes soooooo
>> long for me is that Iam rescaling a 1920x<whatever> recording with a bit
>> rate of 9000 to a 720 resolution and a bit rate of 4771.
>> 
>> I will just let it run and see how long this thing goes. Probably look
>> around to see if this thing is broadcast in 720 instead. Then I dont
>> have to convert the video and it will probably take alot less time.
>> 
>> 
> I have been doing a lot of archiving of shows. With the right scripts it
> works really well. I archive 1080p recordings to 750 MB to 1 GB per
> hour, so you can fit some 6 hours of HD on a regular DVD. The quality is
> almost 100%, there is an occasional artifact. This is done on a low-end
> machine (Pentium Dual core), taking around 2 hours to encode each hour
> of video. With a higher end machine faster times are achieved, I have a
> four year old  I7 that does around 1 hour of video in one hour.
> 
> I am using Handbrake to encode with x264. The settings are important,
> with the wrong settings you can take 12 hours to encode 1 hour of video.
> I have scripts that look at the recording group and if it is set to x264
> the recordings are automatically encoded once a day.
> 
> I am not using the myth to transcode jobs, I run mythlinks to create
> links to the files, then run handbrake scripts against them.
> 
> By using constant quality instead of constant bit rate encoding, you can
> do it in one pass, but the size of files varies with the type of
> material, hence the variation in file sizes. However the quality will be
> constant.
> 
> I am also copying the encoded files back to mythtv and deleting the
> original files, saving a bunch of space in my recording groups.
> 
> My scripts are all here - http://code.google.com/p/mythtv-scripts/
> 
> Look at
> http://code.google.com/p/mythtv-scripts/source/browse/trunk/install/opt/mythtv/bin/encode_video.sh
> http://code.google.com/p/mythtv-scripts/source/browse/trunk/install/opt/mythtv/bin/handbrake_encode.sh
> 
> Peter
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