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  1. Neowinian kingmustard123's Avatar
    Join Date
    Nov 2007
    Location
    United Kingdom
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    I have 6x MKV video files.

    They're 1.45 GB each.

    If I convert them to x265 and keep all the same attributes (frame size, frame rate, audio, overall quality etc.), will the overall file size be lower?

    If so, how can I achieve this in Windows?

    Code:
    General
    
    Format * * * * * * * * * * * * : Matroska
    Format version * * * * * * * * : Version 2
    File size * * * * * * * * * * *: 1.46 GiB
    Duration * * * * * * * * * * * : 29 min
    Overall bit rate * * * * * * * : 6 999 kb/s
    Encoded date * * * * * * * * * : UTC 2012-11-20 08:14:33
    Writing application * * * * * *: mkvmerge v4.9.1 ('Ich will') built on Jul 11 2011 23:53:15
    Writing library * * * * * * * *: libebml v1.2.1 + libmatroska v1.1.1
    
    Video
    
    ID * * * * * * * * * * * * * * : 1
    Format * * * * * * * * * * * * : AVC
    Format/Info * * * * * * * * * *: Advanced Video Codec
    Format profile * * * * * * * * : High@L4.1
    Format settings, CABAC * * * * : Yes
    Format settings, ReFrames * * *: 5 frames
    Codec ID * * * * * * * * * * * : V_MPEG4/ISO/AVC
    Duration * * * * * * * * * * * : 29 min
    Bit rate * * * * * * * * * * * : 5 486 kb/s
    Width * * * * * * * * * * * * *: 1 280 pixels
    Height * * * * * * * * * * * * : 720 pixels
    Display aspect ratio * * * * * : 16:9
    Frame rate mode * * * * * * * *: Constant
    Frame rate * * * * * * * * * * : 25.000 FPS
    Color space * * * * * * * * * *: YUV
    Chroma subsampling * * * * * * : 4:2:0
    Bit depth * * * * * * * * * * *: 8 bits
    Scan type * * * * * * * * * * *: Progressive
    Bits/(Pixel*Frame) * * * * * * : 0.238
    Stream size * * * * * * * * * *: 1.11 GiB (76%)
    Writing library * * * * * * * *: x264 core 129 r2230 1cffe9f
    Encoding settings * * * * * * *: cabac=1 / ref=5 / deblock=1:-1:-1 / analyse=0x3:0x113 / me=umh / subme=7 / psy=1 / psy_rd=1.00:0.15 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=1 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-3 / threads=6 / lookahead_threads=1 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=2 / b_bias=0 / direct=1 / weightb=1 / open_gop=0 / weightp=2 / keyint=250 / keyint_min=25 / scenecut=40 / intra_refresh=0 / rc_lookahead=40 / rc=2pass / mbtree=1 / bitrate=5486 / ratetol=1.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / cplxblur=20.0 / qblur=0.5 / ip_ratio=1.40 / aq=1:1.00
    Language * * * * * * * * * * * : English
    Default * * * * * * * * * * * *: Yes
    Forced * * * * * * * * * * * * : No
    
    Audio
    
    ID * * * * * * * * * * * * * * : 2
    Format * * * * * * * * * * * * : DTS
    Format/Info * * * * * * * * * *: Digital Theater Systems
    Mode * * * * * * * * * * * * * : 16
    Format settings, Endianness * *: Big
    Codec ID * * * * * * * * * * * : A_DTS
    Duration * * * * * * * * * * * : 29 min
    Bit rate mode * * * * * * * * *: Constant
    Bit rate * * * * * * * * * * * : 1 509 kb/s
    Channel(s) * * * * * * * * * * : 6 channels
    Channel positions * * * * * * *: Front: L C R, Side: L R, LFE
    Sampling rate * * * * * * * * *: 48.0 kHz
    Frame rate * * * * * * * * * * : 93.750 FPS (512 spf)
    Bit depth * * * * * * * * * * *: 24 bits
    Compression mode * * * * * * * : Lossy
    Stream size * * * * * * * * * *: 322 MiB (22%)
    Language * * * * * * * * * * * : English
    Default * * * * * * * * * * * *: Yes
    Forced * * * * * * * * * * * * : No
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  2. The resulting x265 result will be smaller or larger depending on what bitrate you use. The quality can only get worse unless you use the lossless setting -- which will cause your files to blow up to ~20 times their current size.
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  3. There are a lot of options to do what you want. One way is to use HandBrake. Open the file, go to video tab, select x265 and set the video bitrate to a value lower than the existing one you see in MediaInfo. E.g.: Currently it is 5 486 kb/s, then enter half of that to half video size(*) (use 2pass for optimal results). For audio you can do something similar, DTS with 1509 kb/s is quite a lot. You can try e.g. Opus with much lower size. As jagabo said: you will technically lose quality. But maybe it will still be good enough for you - if you notice at all. How much you want to sacrifice quality for file size is up to you. HandBrake also lets you select the x264 "preset". You can achieve better quality at the same bitrate (file size) with a slower preset but it can take extremely long to encode with the slower presets. Again: you have to decide how much time you want to invest.

    (*) you can also select the (C)"RF" mode. This will try to achieve a constant quality but with unpredictable file size. Many users prefer that mode.
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  4. It won't be a huge difference, maybe 10% saved bandwidth and it'll take 20 times longer to encode. If it were me, I'd keep it as is. 0.238 BPP isn't a huge bitrate. If you wanna save some space, maybe convert the DTS audio track to AAC or Opus?
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