I apologize beforehand if this post is in the wrong section.
I have about 200 GB of anime on my hard drive, each episode is usually about 300 MB - 600 MB. I would like to know if there is a way to compress ALL of these files without ANY quality loss in the Video, Audio, or Subtitle sectors of the MKV file. I DO NOT want to hardcode the subtitles and they are in a .ass/ssa format. About 90% of the anime are BDRips with 720p video. Thanks in advance for your help.
EDIT: Incorrect wording. I am fine with SOME quality loss, as long as it is not noticeable.
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Last edited by Aravindtop; 27th Apr 2014 at 17:59. Reason: EDIT 1: added more info. EDIT 2: corrected title. EDIT 3: added a word. EDIT 4: grammar. EDIT 5: added to end.
No. Compressing=reconverting=losing quality.
Image and video compression algorithms like JPEG, JPEG-2000, H.264 and H.265 have lossless modes defined as extensions to these standards. For video compression algorithms like H.264 and H.265, after motion estimation (finding similar blocks of video in the same frame or nearby frames), the residual error is calculated. Instead of transforming (converting to the frequency domain) and quantizing (low-pass filtering) the residual error, the full residual error is encoded, and then losslessly compressed (entropy encoding) as always. For a good explanation, see http://www.stanford.edu/class/ee398b/handouts/lectures/LosslessVideoCoding.pdf.
Note - at the moment, x265 doesn't explicitly support lossless encoding... but we plan to add this capability in the coming weeks.
The sad thing about anime is you can lose quit a lot of 'quality' and not notice. In fact, if you run a few denoisers through it you could probably compress it to almost nothing and it would most likely look better than the original.
I learned about this thing called "Mini MKV" which simply lowers the bit rate with minimal quality loss. I torrented a 720p BDRip of Fate/Zero which was converted to what APPEARS to be Mini MKV container (Not 100% sure) and while watching it, I didn't notice much of a difference between the original BD rip and this version (Each episode was hanging around 100 MB). How do I do this??
I really don't think 'Mini MKV' is an official term. If you recompress a Blu Ray rip with any program that uses X264 you can easily make a smaller file, I think the term 'Mini MKV' is just something some idiot made up to describe the difference. There are plenty of programs and plenty of ways to do what you're asking. Handbrake is a place to start. There's a lot more too: http://www.videohelp.com/tools/sections/video-encoders-h264-vc1
If you want to get complicated you could also try AVISynth and X264 directly at some point.
I torrented a 720p BDRip of Fate/Zero which was converted to what APPEARS to be Mini MKV container (Not 100% sure) and while watching it, I didn't notice much of a difference between the original BD rip and this version (Each episode was hanging around 100 MB). How do I do this??
If you didn't notice a quality difference between a 100Mb double re encode and a reasonably sized one I can think of several possibilities:
- you need glasses and you're watching it on a small phone screen.
- the encoding in the larger file you watched was completely botched and you don't have enough sense to notice. Very common with warez downloaders.
Here are the Matroska Specs:
It doesn't mention Mini MKV at all. If you can give us the exact specifications on what qualifies as a 'Mini MKV' we can give you options to achieve it's creation, if you can't give us that information, then you're not really asking a question, and we can't answer questions that aren't questions, which is why all you're getting from us is Bulls#$t.
There's no point expecting the OP to open that and read it. Matroska is a container. Whether you can encode video that small and make it watchable ... which you can't if you're not legally blind ... has nothing to do with the container.
The magic words here are "acceptable/minimal quality loss", which is so totally subjective, no one can rightfully answer with out examples and/or further details & explanations being given by the OP.
"mini MKV", what a joke! Is that like a mini-fraction?
Scott"When will the rhetorical questions end?!" - George Carlin
But, to compress a mkv is mostly to a mp4.
So... the only problem here is the subtitle. Mp4 with floating subs? I haven`t seen any.
1. Could you pls tell what kind of compression you wanna do? (mp4, avi, another mkv...)
2. If you don't compress video and subs (no hardcode subs) or resolution, just use yamb to get a mp4 without losing any quality loss.
3. If there is some other thing completely different what you want... specify clearly to get a correct and prompt answer.
1. What do you wanna do with the subs in the mkv then?
Special note: X264 codec (mostly used on mkv), has an option to encode with a minimum quality loss. But, you have to do it in the most slowest of all options (crf 1 or choosing option in codec).
Besides, something that minimum, is nearly impossible to noticed with naked eye (unless you have an electron microscope attached on it... and watching on a 10bit monitor [8bit can't, even with a Microscope in both eyes]).
Last edited by luisppk; 29th Apr 2014 at 01:55.
Yes, let's get practical here, assuming the OP hasn't left in disgust by now. ASS is a text based subtitle format so you're not getting much smaller than that, srts might be a little smaller but you'll lose some formatting during the conversion, which probably won't be worth the effort.
My iPhone versions of Ben 10: Alien Force are 22 minutes long each, encoded with a resolution of 1024x576 at CRF22 with 160kbps Nero AAC stereo audio, each episode is less than 150mb in size and sadly despite the extra de-noising I add and the extra 4 - 8 CFR points, when I play them on my WDTV I can't actually tell the difference between them and the higher quality encodes. There is some leeway here. (Older animation won't compress as well, they come with noise, even if you remove the noise it will still leave artefacts behind, warping the images from frame to frame, plus they weren't animated as cleanly in the first place, so reference frames won't be as effective as it is in modern computer generated animation). You could probably get away with an even higher CRF, and maybe even go down to 128kbps audio (make sure to encode AAC with either Nero AACEnc or Apple iTunes though). You could even try resizing the video down. Ultimately you'll have to do some test encodes and see what you're happy with. (Of course depending on the GUI you choose, your processing options may be limited.) You may decide to keep the originals, but it's worth a try just to see.
We love AVISynth here, if you want the best quality encodes, download it and we'll show you how to get it working. Assuming you're still there...
Last edited by ndjamena; 29th Apr 2014 at 17:23.
I compress 2 kinds of video from anime (mostly 24 minutes):
1. mp4+aac, 1280x720 to watch them by usb in my led tv.
2. Xvid+mp3, 848x480 to burn on dvd disk and wacth them using the Dvd player with Divx capability.
X264 I use 2 pass encode. Don't like CRF 'cause sometimes file size is unpredictable low.
2pass encode for 1280x720, at 1600kbps (up to 2500 when anime is dark or with too much action sequences). Works great for me.
Xvid, despite talkings, is a nice codec. Can afford 1920x1080. But... file size would be 30% greater than using x264 for the same video.
Xvid 2pass encode for 848x480, at 1400kbps (up to 2000 when anime is dark or too much action sequences), also looks very fine when burning to dvd disk and is used for watching on tv using the dvd player.
Obviously both of them (xvid+x264) with hard subs. Only way to guarantee sub effects, in karaokes, signs or even when 2 people are talking at the same time (imposible to srt).
@ndjamena: You maybe right... but I hope at least this posts will be of use for anyone who needs the info.