OK you wise guys! How come, when I play a programme backwards on the
PVR, the subtitles aren't written backwards?
Seamus
On Sat 22/01/2022 21:02, williamwright wrote:
OK you wise guys! How come, when I play a programme backwards on the PVR,
the subtitles aren't written backwards?
Seamus
You are only showing the movement in reverse, the picture isn't reversed
is it?
So why should the subtitles be backwards?
Do PVRs actually display subtitles if you play a recording slowly or >backwards?
On Sat 22/01/2022 21:02, williamwright wrote:
OK you wise guys! How come, when I play a programme backwards on the
PVR, the subtitles aren't written backwards?
Seamus
You are only showing the movement in reverse, the picture isn't reversed
is it?
So why should the subtitles be backwards?
Just checked. My Manhattan satellite PVR does. It displays the subtitles
at what looks like the appropriate times.
OK you wise guys! How come, when I play a programme backwards on the PVR,
the subtitles aren't written backwards?
Seamus
On 22/01/2022 21:08, Woody wrote:
On Sat 22/01/2022 21:02, williamwright wrote:
OK you wise guys! How come, when I play a programme backwards on the
PVR, the subtitles aren't written backwards?
Seamus
You are only showing the movement in reverse, the picture isn't reversed
is it?
So why should the subtitles be backwards?
If there was sound they'd have to be saying everything backwards.
Bill
That is just silly.
You are still picking up the frames from start to end so the data is still the same.
Back in the days of Vcrs, who recalls the old problem of those Phillips tapes getting a little crease in the bottom edge, and jamming. If you had an old hub set from a chewed one handy, simply make the tape upside down and it could work pretty well, but when played back if not recorded over, you could sometimes see the picture upside down, even though it was scanning the
tracks across them getting bits of multiple tracks. No sync since the track was now playing on the audio channel and vice versa and the colours were all over the place.
Great fun, and really I was surprised the system actually managed to get anything considering the slanted azimuth of the heads on the 1700 machines.
Brian
Actually, is playing a digital stream backwards straightforwards? My basic understanding is you create some sort of master frame that contains the
whole picture and then a series of deltas thereafter and then another
master. If you play backwards you get the deltas first. So does the decoder have to play small chunks forwards internally to reconstruct something it
can play in reverse? Never really thought about it before.
On Sun, 23 Jan 2022 09:58:07 -0000 (UTC), Tweed <usenet.tweed@gmail.com> wrote:
Actually, is playing a digital stream backwards straightforwards? My
basic
understanding is you create some sort of master frame that contains the
whole picture and then a series of deltas thereafter and then another
master. If you play backwards you get the deltas first. So does the
decoder
have to play small chunks forwards internally to reconstruct something it
can play in reverse? Never really thought about it before.
One presumes it has to create the entire GoP in memory, but it's doing
that whilst playing forwards as well.
There is really no concept of backwards, its merely data and the software
one supposes packages the data in a readable form in the first place, so there should be no issue. Brian
"Brian Gaff (Sofa)" <briang1@blueyonder.co.uk> wrote in message news:sslpke$3l1$1@dont-email.me...
There is really no concept of backwards, its merely data and the
software one supposes packages the data in a readable form in the
first place, so there should be no issue. Brian
I suppose if you wanted to get really picky, the data stream can't be
read backwards correctly because the least-significant bit would arrive
first and the most-significant bit would arrive last (or vice-versa),
and the frame headers would be at the end rather than the beginning of
the frame that they applied to. You'd also receive the incremental "difference" frames before the full frame that they related to.
There is really no concept of backward
On 24/01/2022 09:32, NY wrote:
"Brian Gaff (Sofa)" <briang1@blueyonder.co.uk> wrote in message
news:sslpke$3l1$1@dont-email.me...
There is really no concept of backwards, its merely data and the
software one supposes packages the data in a readable form in the first >>> place, so there should be no issue. Brian
I suppose if you wanted to get really picky, the data stream can't be
read backwards correctly because the least-significant bit would arrive
first and the most-significant bit would arrive last (or vice-versa), and
the frame headers would be at the end rather than the beginning of the
frame that they applied to. You'd also receive the incremental
"difference" frames before the full frame that they related to.
When playing backwards or a recording faster forward are only the
reference (full) frames displayed?
On 24/01/2022 08:56, Brian Gaff (Sofa) wrote:
There is really no concept of backward
They don't even say 'educationally sub-normal' nowadays.
Bill
I've not got an HD PVR (I record on a Raspberry Pi running TVHeadend and watch using VLC on my PC or else via Plex on a TV) so I wonder if the playback capabilities in HD are more limited or more jerky
because H264 is a lot more computationally intensive than MPEG to decode.
OK you wise guys! How come, when I play a programme backwards on the
PVR, the subtitles aren't written backwards?
"Woody" <harrogate3@ntlworld.com> wrote in message news:sshrpb$bs8$1@dont-email.me...
On Sat 22/01/2022 21:02, williamwright wrote:
OK you wise guys! How come, when I play a programme backwards on the
PVR, the subtitles aren't written backwards?
Seamus
You are only showing the movement in reverse, the picture isn't
reversed is it?
So why should the subtitles be backwards?
If you load a VHS video tape upside down (by unreeling it and winding it
the opposite way on the spools) the picture is upside down, as well as
being very ragged because the sync pulses are in the wrong place. I had
a VHS tape which got badly mangled in an old VHS machine making the tape unplayable, so as an experiment I took a good bit of the tape near the
end and wound it upside down on the take-up spool, and then sorted out
the supply spool in the same way before putting it back into the
cassette. And when I played it, the picture was upside down - as
expected, really.
Do PVRs actually display subtitles if you play a recording slowly or backwards?
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