Xanders Posted March 22, 2013 Report Share Posted March 22, 2013 I'm trying to compress some mkv videos into a 7z file but i don't know which compression method to use to ensure the files quality stay completely intact Link to comment Share on other sites More sharing options...
† Sicka Posted March 22, 2013 Report Share Posted March 22, 2013 I don't think it really matters, 7z is just an archive file like rar/zip etc, adding files to it doesn't actually modify the original files. Link to comment Share on other sites More sharing options...
Xanders Posted March 22, 2013 Author Report Share Posted March 22, 2013 (edited) You mean to say that it doesn't matter after when i'd finish compressing the video would still be original condition,I once heard from my uncle(video & photo editor from a travelling company) said compressing them would ruin its quality Edited March 22, 2013 by Xanders Link to comment Share on other sites More sharing options...
ZeroPenguins Posted March 22, 2013 Report Share Posted March 22, 2013 LOL, your uncle means image/video compression which is different to archive compression. There isn't any benefits in archive compression in a video file, it's only benficial if lets say the subs are huge in file size (or maybe the video headers hahaha). Think of it this way subs are like air which has huge gaps inbetweens, while the video is like a solid where there isn't any space left to be compressed. As you can guess from that analogy you won't be saving much space. Meanwhile compression from video encoder (i.e x264) or JPEG compression is entirely different. It's basically apples and oranges. Link to comment Share on other sites More sharing options...
JohnFlower Posted March 22, 2013 Report Share Posted March 22, 2013 (edited) LOL, your uncle means image/video compression which is different to archive compression. There isn't any benefits in archive compression in a video file, it's only benficial if lets say the subs are huge in file size (or maybe the video headers hahaha). Think of it this way subs are like air which has huge gaps inbetweens, while the video is like a solid where there isn't any space left to be compressed. As you can guess from that analogy you won't be saving much space. Meanwhile compression from video encoder (i.e x264) or JPEG compression is entirely different. It's basically apples and oranges.this ^ sometimes you can achieve maybe 10mb compression, but that is about as far as it will go. the only benefits would be being able to add recovery, and not having to worry about filenames when you upload to a filehost (they sometimes remove the [ and ] and change them to underscores). you can also split them easily, and have multiple videos per rar (i prefer rar over 7z for my compression). EDIT: testing winrar compression set on it's highest level with a 64gb movie. will share the result. Edited March 22, 2013 by JohnFlower Link to comment Share on other sites More sharing options...
Xanders Posted March 23, 2013 Author Report Share Posted March 23, 2013 (edited) OH so that's what my uncle meant, I really needed the recovery feature for storage my cousins are very picky with archives... @JohnFlowerI would like to know your results when its done Edited March 23, 2013 by Xanders Link to comment Share on other sites More sharing options...
JohnFlower Posted March 23, 2013 Report Share Posted March 23, 2013 (edited) well, winrar won out for me...first there is the time it took. winrar took about 40 minutes, while 7zip took close to 5 hours. this likely due to winrar being able to utilise many more cores than what 7zip could (default settings both apps).the results of the compression, rar won out here again (keep in mind, all i changed from default settings for both programs was the compression setting, ie, best for winrar and ultra for 7zip). surprisingly enough, 7zip made my file bigger Sat, 23 Mar 04:07 p.m. 69,775,173,177 The Return Of The King 2003 EC 1080p BluRay Remux AVC DTS-HD MA 6.1 - KRaLiMaRKo.7zThu, 27 Dec 05:24 a.m. 69,280,146,871 The Return Of The King 2003 EC 1080p BluRay Remux AVC DTS-HD MA 6.1 - KRaLiMaRKo.mkvSat, 23 Mar 11:33 a.m. 69,082,921,595 The Return Of The King 2003 EC 1080p BluRay Remux AVC DTS-HD MA 6.1 - KRaLiMaRKo.rari am re-running the test, because 7zip's default LZMA compression isn't good for things that are already compressed (h264 video). using LZMA2 allows 7zip to use all of my cores apparently, but it never gets over 10%. Edited March 23, 2013 by JohnFlower Link to comment Share on other sites More sharing options...
ZeroPenguins Posted March 24, 2013 Report Share Posted March 24, 2013 lols, recovery defeats the purpose of saving space. As it increases file sizes. Link to comment Share on other sites More sharing options...
Xanders Posted March 24, 2013 Author Report Share Posted March 24, 2013 Guess ill stick with winrar thanks lot though for the test Link to comment Share on other sites More sharing options...
JohnFlower Posted March 24, 2013 Report Share Posted March 24, 2013 i did the test with LZMA2 compression instead of LZMA. the resulting filesize was smaller than what winrar could produce (by about 10mb). but the time it took was still over an hour, closer to 2 hours actually. Link to comment Share on other sites More sharing options...
Randomstuffs22 Posted April 1, 2013 Report Share Posted April 1, 2013 Hey guys whats the best way to compress a file on an Mac? I am currently using BetterZip Link to comment Share on other sites More sharing options...
urban123456789 Posted June 2, 2013 Report Share Posted June 2, 2013 Try to use FormatFactory. This program doent change a quality any how I dont spot a difrence. Link to comment Share on other sites More sharing options...
nordak Posted June 4, 2013 Report Share Posted June 4, 2013 I don't think you will save as much space as you are thinking you will. It is hard to cut the space on videos and the best bet will probably be the release of h265 / vp9 to save space. Link to comment Share on other sites More sharing options...
gronealuck Posted August 4, 2014 Report Share Posted August 4, 2014 I used to use a little piece of software called Faasoft Video Converter to compress MP4, AVI, MKV, WMV, MOV, MP3, WAV, etc, happy with it. Link to comment Share on other sites More sharing options...
ZeroPenguins Posted August 4, 2014 Report Share Posted August 4, 2014 Anyhow I should've probably said this awhile back. You probably would've more better luck using NTFS compression by default on Windows. Assuming you're using Windows and NTFS file system. Of course if you want to just compress and keeping original content. Link to comment Share on other sites More sharing options...
professa X Posted August 27, 2014 Report Share Posted August 27, 2014 I remember when I looked into this. Just look up lossless compression. There and how does it work article. Link to comment Share on other sites More sharing options...
targetdoneaim Posted September 19, 2014 Report Share Posted September 19, 2014 As far as I know, there are mainly two methods to compress MKV video file size: Method one: Compress MKV by converting MKV to MP4, AVI, 3GP or other video formats In the same video quality situation, the MKV file size is much larger than other video formats like MP4. To shrink MKV without loss of video quality, we may convert MKV to MP4, 3GP, AVI and etc. If you do not want to change the video format, you may refer to Method two. Method two: Shrink MKV by adjusting MKV video bit rate, resolution, frame rate etc This method helps to resize MKV files to get a good balance of quality and file size. And you may choose to compress MKV as well as keep the MKV as the output video format. You may also choose to shrink and convert MKV to other video format. Detailed guide at http://www.idealshare.net/video-converter/mkv-compressor.html Link to comment Share on other sites More sharing options...
Hark0n Posted September 19, 2014 Report Share Posted September 19, 2014 As far as I know, there are mainly two methods to compress MKV video file size: Method one: Compress MKV by converting MKV to MP4, AVI, 3GP or other video formats In the same video quality situation, the MKV file size is much larger than other video formats like MP4. To shrink MKV without loss of video quality, we may convert MKV to MP4, 3GP, AVI and etc. If you do not want to change the video format, you may refer to Method two. Method two: Shrink MKV by adjusting MKV video bit rate, resolution, frame rate etc This method helps to resize MKV files to get a good balance of quality and file size. And you may choose to compress MKV as well as keep the MKV as the output video format. You may also choose to shrink and convert MKV to other video format. Detailed guide at http://www.idealshare.net/video-converter/mkv-compressor.htmlMKV is only container and can contain a wide variety of video and audio formats. The methods You are providing are are re-encoding (each simply have different containers), witch always results in change (usually decrease) of video and audio quality.It is possible to remux MKV to MP4, if tracks used in MKV are supported by MP4, but that will not give large benefit in saving disc space, it may be useful for compatibility purpose though. Link to comment Share on other sites More sharing options...
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