6 Nov
2020
6 Nov
'20
2:46 p.m.
the computer i was doing these experiments on had a failed hard drive and got
taken out of service and now the corporation is going through a failure
analysis process to study how hard drives fail at high temperatures.
I have advised that the recording system be reconfigured to save data at the
target framerate rather than do transcoding, since the latter seems
impractical.
but i'll bring updates when i have them
On Fri, 6 Nov 2020, hol(a)gaskill.com wrote:
How did this turn out?? Before seeing this thread I
was trying to think up a
good way to compress raw raster data coming off a photogrammetry drone and
just dropping all but one frame per second seemed like the best idea.
On 2020-10-09 3:49 pm, Sean Greenslade wrote:
On Fri, Oct 09, 2020 at 01:11:12PM -0700, Jake
wrote:
OMG thank you so much, this is great help
everyone!!!
some operations take a long time and some are quicker, i'm trying to hone
in on
the ones that are quick and dirty, rather than re-encoding everything.
It's so
hard to understand the documentation!!!
Yeah, FFMPEG can be pretty intimidating. Unfortunately, in the case of
doing time lapses, you almost certainly need to re-encode the video. The
one exception would be if your desired speedup exactly matches the rate of
i-frames in the source video. Then you could make a custom script that
just dropped all the p-frames. I have some code that could probably be
adapted for that if you're interested.
I'll try these commands and take notes on
what works and what doesn't.
Feel
free to let me know if you're interested in the results!
Yeah, show us!
one thing i've been working with is that
i'm doing concatenation at the
same
time... so much obscure arcane procedure that you just find on the web and
try
until it works.
Concatenation can be tricky. Make absolutely sure all the source videos
have the same format / resolution.
And i was having troubles until i realized that
the hard drives in the
server I
was accessing were slowly dying off from overheating...
Lol, yup, hard drives can get pretty toasty when they're being
stressed. Make sure your servers have fans pointed at the drives.
--Sean
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