J. P. Gilliver
2024-02-16 12:25:20 UTC
I'm just watching a clip - obviously from someone's home recording -
that's, according to VLC:
Video resolution: 476x360
Buffer dimensions: 480x368
Frame rate: 29.970029
(I don't think VLC shows me whether it's interlaced or not.)
I deduce from the frame rate (and that the uploader said it was "on
Vera's 9/24/75 show"), that it was recorded in 525-land. (The clip is
if anyone's interested.) [I
presume it was originally BBC, so had been converted (not by the
uploader).]
It occurred to me that I've seen 360 quite often in low-quality clips on
YouTube, and I wondered where that number came from? AIUI, 525-land is
480 same as we in 625 were 576. I could understand if it was 240 -
discarding one field, or some other simple interpolation, but 360
implies a moderate amount of processing.
The audio (of course, encoded as 44100 stereo as usual on YouTube) is
mono, mostly below about 9 kHz, but I noticed (in GoldWave - I don't
hear that high nowadays!) it has two quite clear tones. Oh, I thought -
timebase breakthrough (virtually any YouTube audio that comes from video
- and much that doesn't! - has a line around 15½ kHz) from both the
standards: interesting! But then I looked more carefully, and they're at
10xxx Hz (no, it's in colour, so not from 405-line! [1975, anyway.]) and
11xxx - I'd guess about 10 and a third and 11 and two thirds. (I don't
think GoldWave has a frequency counter that'd tell me for sure.)
Thoughts as to their source?
that's, according to VLC:
Video resolution: 476x360
Buffer dimensions: 480x368
Frame rate: 29.970029
(I don't think VLC shows me whether it's interlaced or not.)
I deduce from the frame rate (and that the uploader said it was "on
Vera's 9/24/75 show"), that it was recorded in 525-land. (The clip is
if anyone's interested.) [I
presume it was originally BBC, so had been converted (not by the
uploader).]
It occurred to me that I've seen 360 quite often in low-quality clips on
YouTube, and I wondered where that number came from? AIUI, 525-land is
480 same as we in 625 were 576. I could understand if it was 240 -
discarding one field, or some other simple interpolation, but 360
implies a moderate amount of processing.
The audio (of course, encoded as 44100 stereo as usual on YouTube) is
mono, mostly below about 9 kHz, but I noticed (in GoldWave - I don't
hear that high nowadays!) it has two quite clear tones. Oh, I thought -
timebase breakthrough (virtually any YouTube audio that comes from video
- and much that doesn't! - has a line around 15½ kHz) from both the
standards: interesting! But then I looked more carefully, and they're at
10xxx Hz (no, it's in colour, so not from 405-line! [1975, anyway.]) and
11xxx - I'd guess about 10 and a third and 11 and two thirds. (I don't
think GoldWave has a frequency counter that'd tell me for sure.)
Thoughts as to their source?
--
J. P. Gilliver. UMRA: 1960/<1985 MB++G()AL-IS-Ch++(p)***@T+H+Sh0!:`)DNAf
While no one was paying attention, weather reports became accurate and the
news became fiction. Did not see that coming. - Scott Adams, 2015
J. P. Gilliver. UMRA: 1960/<1985 MB++G()AL-IS-Ch++(p)***@T+H+Sh0!:`)DNAf
While no one was paying attention, weather reports became accurate and the
news became fiction. Did not see that coming. - Scott Adams, 2015