gpg: failed to create temporary file '/var/lib/lurker/.#lk0x57fb2100.hantslug.org.uk.27970': Permission denied
gpg: keyblock resource '/var/lib/lurker/pubring.gpg': Permission denied
gpg: Signature made Sun Jan 28 21:34:59 2007 GMT
gpg: using DSA key B2C27BC21C335860
gpg: Can't check signature: No public key
On Sun, Jan 28, 2007 at 05:28:19AM +0000, James Courtier-Dutton wrote:
> I do a fair amount of video editing. This is mainly from DV tapes from
> camcorders.
I do a fair amount, too, all of MPEG2 streams.
> DVD is a problem. It uses MPEG2. It uses compressions that relies of
> prediction from previous frames. As such, it is considerably more
> difficult to edit, because if you try to cut out one of the frames
> used to predict another frame, the editor has to re-encode the stream.
> Unfortunately, not many Linux editors support editing with these types
> of compressed streams. Generally, editing a MPEG2 stream results is a
> loss of quality on the output, due to the re-encoding requirement. DV
> streams do not require any re-encoding so the quality is preserved.
With the appropriate settings, avidemux will allow GOP-level cuts
(typically 12 frames on DVD or DVB material). It also has a "smart
copy" feature, which will allow you to do frame-accurate cuts. It does
this by re-coding only the sections that require recoding as a result
of the cut (i.e. the parts between the cut and the nearest I-frame in
each direction).
Further, in my experience, as long as you're careful to set a
target bit-rate of at least that of the original material, recoding an
MPEG2 video causes little or no visible loss of image quality.
Hugo.
--
=== Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk ===
PGP key: 1C335860 from wwwkeys.eu.pgp.net or http://www.carfax.org.uk
--- echo "killall cat" > ~/curiosity.sh ---
