Date: Mon, 18 Jun 2012 13:21:43 -0400 From: "Dieter BSD" <dieterbsd@engineer.com> To: freebsd-multimedia@freebsd.org Cc: freebsd-hackers@freebsd.org Subject: Re: how to turn my computer into a TV Message-ID: <20120618172144.303410@gmx.com>
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user.vdr writes: > Recording doesn't require any compression unless you are transcoding > in real-time. There's no difference between recording ATSC, NTSC, PAL, > etc, and it's actually irrelevant what the stream is. This is incorrect. ATSC is compressed before broadcast, so you receive the data already compresed. NTSC and PAL are broadcast in analog. The tuner performs A-to-D which gives an uncompressed data stream. Have fun trying to store that. As a practical matter, you have to compress the data in real time. Some, not all, tuners include hardware compression. > Lastly, it's possible to save a single channel or the entire stream > which usually contains several channels. Even when saving the full > stream, it likely uses far less bandwidth than your media offers so > there's no problem there. This appariently refers to ATSC. Yes, modern disks have plenty of bandwidth to store the entire ATSC stream. The main reason to filter PIDs is to save disk *space*. Also, some software can't select which program to decode. Wojciech writes: > most people vastly underestimate power of modern CPUs. Many people overestimate the "moderness" of most people's CPUs.
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