[sudo-discuss] how to speed up a video file and reduce its size?

[hol at gaskill.com]

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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