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  1. Member
    Join Date
    Sep 2007
    Location
    United Kingdom
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    Hi

    I have a 9 minute family outing which is a whopping 1Gb in size

    I was wondering if i could get the file size down without losing quailty (or too much quality) to a manageable size

    (prefer h264 in Mp4 container if thats ok, and as close to original as possible)


    some mediaInfo on file

    Code:
    General
    Complete name                            : C:\Users\zack\Desktop\family vacation 2014.mp4
    Format                                   : MPEG-4
    Format profile                           : Base Media
    Codec ID                                 : isom
    File size                                : 1.08 GiB
    Duration                                 : 9mn 1s
    Overall bit rate                         : 17.2 Mbps
    Writing application                      : Lavf54.63.104
    
    Video
    ID                                       : 1
    Format                                   : AVC
    Format/Info                              : Advanced Video Codec
    Format profile                           : Main@L4.1
    Format settings, CABAC                   : Yes
    Format settings, ReFrames                : 4 frames
    Format settings, GOP                     : M=3, N=15
    Codec ID                                 : avc1
    Codec ID/Info                            : Advanced Video Coding
    Duration                                 : 9mn 1s
    Bit rate                                 : 17.0 Mbps
    Width                                    : 1 920 pixels
    Height                                   : 1 080 pixels
    Display aspect ratio                     : 16:9
    Frame rate mode                          : Variable
    Frame rate                               : 50.000 fps
    Minimum frame rate                       : 16.667 fps
    Maximum frame rate                       : 50.000 fps
    Color space                              : YUV
    Chroma subsampling                       : 4:2:0
    Bit depth                                : 8 bits
    Scan type                                : Interlaced
    Scan order                               : Top Field First
    Bits/(Pixel*Frame)                       : 0.164
    Stream size                              : 1.07 GiB (99%)
    
    Audio
    ID                                       : 2
    Format                                   : AAC
    Format/Info                              : Advanced Audio Codec
    Format profile                           : LC
    Codec ID                                 : 40
    Duration                                 : 9mn 1s
    Bit rate mode                            : Constant
    Bit rate                                 : 128 Kbps
    Channel(s)                               : 2 channels
    Channel positions                        : Front: L R
    Sampling rate                            : 48.0 KHz
    Compression mode                         : Lossy
    Stream size                              : 8.26 MiB (1%)
    Language                                 : unk

    thanks
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  2. HandBrake / Vidcoder with passthrough for the audio and else default settings for "Normal" preset and have a look at the size/quality.
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  3. Member Cornucopia's Avatar
    Join Date
    Oct 2001
    Location
    Deep in the Heart of Texas
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    For consistency/compatibility (especially if showing this to other family members), you're going to want to convert the VFR to CFR. Let me guess, did you take this with a phone?

    Scott
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  4. Given it's MP4, it quite possible MediaInfo is getting it wrong and it's not VFR.
    There's a theory here that many MP4s created by Handbrake are inherently slightly variable, and MediaInfo reports VFR even when the output is set to CFR.

    Similar problem here with a TS file.

    That aside....
    in this case I'd probably suggest Handbrake/Vidcoder too, I'd use the High profile preset, and under the filters tab I'd disable the Decomb filter (I think it's enabled by default) and I'd enable the de-interlacing filter instead while choosing "Bob" as the de-interlacing method. For the output frame rate I'd select "constant frame rate" and set it at 50fps.

    Under the video tab (I think it's there) I'd enable resizing, select "anamorphic none" as the resizing method, and resize down to 720p (1280x720). If the source is truly interlaced the output should be 50fps progressive and probably not take a noticeable hit in respect picture detail, if you can see any difference at all, and at 720p the output file size will be much smaller for a given quality.

    For the encoding mode I'd choose quality based encoding (or CRF or RF or whatever HandBrake calls it). Higher RF values = lower quality and smaller file sizes.
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  5. Member
    Join Date
    Sep 2007
    Location
    United Kingdom
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    Thank you for the help

    I tryed the settings that was given to me in the previous post and it took about 90 mins to do, which gave me a file size of 416 MB


    MediaInfo

    Code:
    General
    Complete name                            : C:\Users\ZACK\Desktop\Family Vacation 2014-1.mp4
    Format                                   : MPEG-4
    Format profile                           : Base Media / Version 2
    Codec ID                                 : mp42
    File size                                : 416 MiB
    Duration                                 : 9mn 1s
    Overall bit rate mode                    : Variable
    Overall bit rate                         : 6 441 Kbps
    Writing application                      : HandBrake 0.10.0 2014112200
    
    Video
    ID                                       : 1
    Format                                   : AVC
    Format/Info                              : Advanced Video Codec
    Format profile                           : High@L4.1
    Format settings, CABAC                   : Yes
    Format settings, ReFrames                : 4 frames
    Codec ID                                 : avc1
    Codec ID/Info                            : Advanced Video Coding
    Duration                                 : 9mn 1s
    Bit rate                                 : 6 048 Kbps
    Width                                    : 1 280 pixels
    Height                                   : 720 pixels
    Display aspect ratio                     : 16:9
    Frame rate mode                          : Constant
    Frame rate                               : 50.000 fps
    Color space                              : YUV
    Chroma subsampling                       : 4:2:0
    Bit depth                                : 8 bits
    Scan type                                : Progressive
    Bits/(Pixel*Frame)                       : 0.131
    Stream size                              : 391 MiB (94%)
    Writing library                          : x264 core 142 r2479 dd79a61
    Encoding settings                        : cabac=1 / ref=3 / deblock=1:0:0 / analyse=0x3:0x113 / me=hex / subme=7 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=1 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=3 / 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=1 / b_bias=0 / direct=1 / weightb=1 / open_gop=0 / weightp=2 / keyint=500 / keyint_min=50 / scenecut=40 / intra_refresh=0 / rc_lookahead=40 / rc=crf / mbtree=1 / crf=20.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / vbv_maxrate=62500 / vbv_bufsize=78125 / crf_max=0.0 / nal_hrd=none / filler=0 / ip_ratio=1.40 / aq=1:1.00
    Color primaries                          : BT.709
    Transfer characteristics                 : BT.709
    Matrix coefficients                      : BT.709
    
    Audio #1
    ID                                       : 2
    Format                                   : AAC
    Format/Info                              : Advanced Audio Codec
    Format profile                           : LC
    Codec ID                                 : 40
    Duration                                 : 9mn 1s
    Bit rate mode                            : Variable
    Bit rate                                 : 161 Kbps
    Channel(s)                               : 2 channels
    Channel positions                        : Front: L R
    Sampling rate                            : 48.0 KHz
    Compression mode                         : Lossy
    Stream size                              : 10.4 MiB (2%)
    Title                                    : Stereo
    
    Audio #2
    ID                                       : 3
    Format                                   : AC-3
    Format/Info                              : Audio Coding 3
    Mode extension                           : CM (complete main)
    Format settings, Endianness              : Big
    Codec ID                                 : ac-3
    Duration                                 : 9mn 1s
    Bit rate mode                            : Constant
    Bit rate                                 : 224 Kbps
    Channel(s)                               : 2 channels
    Channel positions                        : Front: L R
    Sampling rate                            : 48.0 KHz
    Bit depth                                : 16 bits
    Compression mode                         : Lossy
    Stream size                              : 14.5 MiB (3%)
    Title                                    : Stereo


    The only problem in there are 'artifacts' appearing in some places quite frequently

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    Could this be to Notebook being underpowered or something else


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    Any other suggestions or options i could try or is this best only option for me.

    thanks

    zack
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  6. I'm not sure about the artefacts problem. I don't actually use Handbrake myself and the latest version won't run on XP, which I'm using.

    Maybe if you can, split off a small sample of the video somewhere where the re-encoding will result in artefacts, someone can have a look. I don't work with MP4s much but you can open one with MKVMergeGUI, then under the Global tab enable splitting. I think if you enable "split after duration" and specify a time in hours, minutes and seconds (ie 00:05:52) and in the maximum number of files box, specify 2, that'll just split the MP4 once where you specify. The output files will be MKV. Then you can open one of the split segments if need be and split it the same way, which should let you split off a small sample for attaching to a post. There's possibly a way to split a file into multiple sections in one go, but the above method will get you there.

    Those artefacts don't look typical to me in that they don't look like decoding errors or encoding artefacts, unless they've been resized a fair bit. A sample would be the easiest way to (hopefully) find out.
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  7. Member
    Join Date
    Sep 2007
    Location
    United Kingdom
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    sorry for the delay work work work

    Now i encoded the clip (using hello's technique) again on the M90 notebook, split a small section off where the video was bad.

    I have a different laptop for internet which is this one im using for this (Dell Latitude D830) like to keep things separate

    .

    Click image for larger version

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    I thought i would test the clips on the D830, To my surprise, they play perfectly on this laptop without any artifacts using WMP and VLC. I even tryed the full clip and again no problems on the D830

    So the M90 can encode perfectly but has problems playing the clips (both in WMP and VLC) but the D830 can play (encoded M90) clips perfectly

    Could the M90 have a Hardware or Software fault as its more powerful than the D830

    .
    Last edited by zack28; 3rd Feb 2015 at 08:59.
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