Need help with some video encoding

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Twinrehz

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May 19, 2014
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Norge
I'm hoping someone on this forum knows a bit about encoding and possibly re-encoding video.

The case is this: I have the episodes of a series I'm watching, but the files are gigantic, we're talking 3,5GB+ per episode. Each episode is about 45 minutes long, and the video resolution is 1080p. I assume it's used x264 for encoding, the video is in AVC, container used is .mkv.

The quality of the files is impeccable, which I assume comes down to their almost complete lack of compression, and I was wondering if I could compress them myself. I know re-encoding something that is already encoded in lossy format is bad, but these files must be using the original Blu-ray discs bitrate - otherwise they wouldn't be this size - so compressing them shouldn't degrade quality in any noticeable way, if it's possible to do it without too much hassle. (Some googling told me that blu-rays usually run at 20Mbps bitrate, these videos peak at around 15Mbps).

So can I compress them, and will it be easy, or will it be very much effort required? Do I need to synchronise the audio or something? I want to maintain as high quality as possible, and when I see that episodes of 20 minute long comedy shows can be found at 250-400MB with flawless quality (or not noticeable video compression), then surely these episodes could be squeezed down to one-third of their current size or so, at least to below 1GB without significant quality loss?
 

Frezzato

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I recommend Handbrake. This [http://blogs.it.ox.ac.uk/adamweblearn/2013/10/how-to-compress-large-video-files-without-losing-quality-using-handbrake/] page contains good advice.

The main reason I suggest sticking to MKV format is it can embed subtitles without the need for a separate text file like .srt. You can compress MKV files using Handbrake; you don't have to choose MP4 like the above linked tutorial says.
 

Twinrehz

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Thanks for the reply, I'll give it a look. As for the format, I don't intend to embed subtitles in a show already in english, however I don't know if there are any practical differences between .mp4 and .mkv, except for the aforementioned subtitles.
 

Frezzato

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Another good thing about Handbrake is you can create a queue for batch conversions. It takes careful work to add items to the queue without screwing up, but once you get the hang of it you can do dozens of conversions and just walk away from your machine.