[FFmpeg-user] Blue Ray Question

Ron Barnes rbarnes at njdevils.net
Fri Jun 9 17:15:55 EEST 2017

Thank you for the concise answer and quick response!

-----Original Message-----
From: ffmpeg-user [mailto:ffmpeg-user-bounces at ffmpeg.org] On Behalf Of Carles Vila
Sent: Friday, June 9, 2017 9:40 AM
To: FFmpeg user questions <ffmpeg-user at ffmpeg.org>
Subject: Re: [FFmpeg-user] Blue Ray Question

On 9 June 2017 at 15:26, Ron Barnes <rbarnes at njdevils.net> wrote:

> Hello All,
> I know there are tools out there for this question but I'm hoping 
> FFmpeg can handle things.
> I have an old blue ray that I would like to shrink.  The only problem 
> is when I open the BR in File Explorer there is no way of knowing 
> which files are the main movie and what order those files are supposed to be in.
> Can FFmpeg or a tool of FFmpeg help in determining the answer?
> What is the main movie files and what order should they be in?
No, ffmpeg won't help you in determining that Blu-rays can be authored in many ways. The main content is most probably the largest file. For a feature film, around 20 GB for a single-layer BD or
40 GB for a double-layer BD.
Other files you will see are extra content, trailers, logos, whatever. just look for the largest file.
Keep in mind if it's a commercial BD, it will be encrypted and ffmpeg won't decode it.
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