Compress video to a certain file size?

[kingmustard123]

I have a 6-minute uncompressed VHS capture.

It's currently 1.10 GB (6m 55s) and I'd like to compress it to around 20-25 MB.

I know it will be poor quality but I was wondering if it can be done?

Freemake Video Converter lets you choose a video output size but you can't enter custom size, you have to choose from it's recommended minimum, upward.

[jagabo]

Use any encoder that lets you set the bitrate (size = bitrate x running time) or file size. Handbrake, Vidcoder, AviSynth FilterMod, AviDemux, etc.

[DB83]

Of course you can compress your video down to your desired size. Look at the Software/Tools section for 'Bitrate Calculators'. You need to take audio in to account hence I have not suggested one.

Also use an encoder/converter such as avidemux or handbrake which will allow a choice of codecs and bitrates.

[Cornucopia]

Understand this: what you claim to be uncompresssed in your source IS NOT. 1.10GB = 9011.2Mb. 6min55sec = 415sec. 9011.2 / 415 = 21.71Mb/sec. SD uncompressed is ~270Mbps, so your material is already compressed 12.44:1. Neither here nor there if you are recompressing, but it will affect the expected quality downward.
25MB = 200Mb, so its resultant bitrate for that target size would have to be 200 / 415 = 0.48Mbps, a compression ratio of 562:1. Pretty dang compressed. So, quite likely bad quality.
Just so you're aware.

Scott

[DB83]

Scott.

I guess that anyone reading this topic with a modicum of knowledge about video bitrate would gleam that 6:55 @ 1.10 gig could not really mean uncompressed.

Given that it is Sunday morning (which follows Saturday night and all that might entail) I simply can not get my head around that 1.10GB = 9011.2MB (I would have expected 1126.4). Not that it makes significant difference to the ultimate compressabilty of the original source.

[jagabo]

He meant 9011.2 Mb, not MB.

1.1 GB * 1024 = 1126.4 MB
1126.4 MB * 8 bits/byte = 9011.2 Mb

[DB83]

Muchas Grassias.

Surely there must be a better way to express the difference between MB and Mb (or Bytes v bits). And with respect to Scott he did say Mb.

[Cornucopia]

Having been on this site for nearly 2 decades, I can tell you with confidence that the visitors who come looking at topics for something that matches their current interest OFTEN have NO modicum of video knowledge. I wrote that with them in mind as well as the OP. Yes, it has been stated many times before, but not quite recently, and visitors are notorious for ignoring older threads, even when they're helpful stickies. Refresh the info = refresh the help.

Oh, and I wrote it properly (Mb vs MB).
(...looks like you beat me to it)

Scott

[jagabo]

Surely there must be a better way to express the difference between MB and Mb (or Bytes v bits).

You can always just spell it out. But using B for Byte and b for bit is common and follows the international metric standard (which mostly uses capitols for values > 10^0, and lower case for values < 10^0).

https://en.wikipedia.org/wiki/International_System_of_Units#Prefixes