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  1. My goal is to reduce the size of this file to 480p resolution with Intact Quality

    This is the information obtained from mediainfo


    # MediaInfo

    Format : MPEG-4
    Format profile : Base Media
    Codec ID : isom (isom/iso2/avc1/mp41)
    File size : 15.1 GiB
    Duration : 7 h 30 min
    Overall bit rate : 4 796 kb/s
    Writing application : Lavf58.26.101

    Video
    ID : 1
    Format : AVC
    Format/Info : Advanced Video Codec
    Format profile : High@L4
    Format settings : CABAC / 1 Ref Frames
    Format settings, CABAC : Yes
    Format settings, RefFrames : 1 frame
    Format settings, GOP : M=1, N=12
    Codec ID : avc1
    Codec ID/Info : Advanced Video Coding
    Duration : 7 h 30 min
    Bit rate : 4 672 kb/s
    Width : 1 920 pixels
    Height : 1 080 pixels
    Display aspect ratio : 16:9
    Frame rate mode : Variable
    Frame rate : 22.450 FPS
    Minimum frame rate : 0.047 FPS
    Maximum frame rate : 25.000 FPS
    Original frame rate : 23.976 (24000/1001) FPS
    Color space : YUV
    Chroma subsampling : 4:2:0
    Bit depth : 8 bits
    Scan type : Progressive
    Bits/(Pixel*Frame) : 0.100
    Stream size : 14.7 GiB (97%)
    Codec configuration box : avcC

    Audio
    ID : 2
    Format : AAC LC
    Format/Info : Advanced Audio Codec Low Complexity
    Codec ID : mp4a-40-2
    Duration : 7 h 30 min
    Bit rate mode : Constant
    Bit rate : 118 kb/s
    Channel(s) : 2 channels
    Channel layout : L R
    Sampling rate : 44.1 kHz
    Frame rate : 43.066 FPS (1024 SPF)
    Compression mode : Lossy
    Stream size : 379 MiB (2%)
    Default : Yes
    Alternate group : 1

    Are these two solutions good ?


    ffmpeg.exe -i "15GB.mp4" -s 720x480 -aspect 16:9 -an -pix_fmt yuv420p -f yuv4mpegpipe - | x264.exe --demuxer y4m --crf 20.0 --preset veryslow --tune film --bluray-compat --vbv-maxrate 8000 --vbv-bufsize 8000 --level 3.2 --keyint 30 --open-gop --colorprim "smpte170m" --transfer "smpte170m" --colormatrix "smpte170m" --sar 40:33 --output "15GB.x264.mkv" -

    ffmpeg.exe -i "15GB.x264mp4" -c:a ac3 -b:a 192k -ar 48000 "raw_audio.ac3"

    mkvmerge.exe --output "15GB.7hous.x264.mkv" --language 0:und ^"^(^" 15GB.x264.mkv ^"^)^" --language 0:und ^"^(^" raw_audio.ac3 ^"^)^" --track-order 0:0,1:0


    OR

    for %%a in ("15GB.*") do ffmpeg -i "%%a" -preset veryslow -tune film -profile high -level 32 -g 30 -r 30000/1001 -flags +ilme+ildct -pix_fmt yuv420p -filter_complex scale=interl=1,fieldorder=tff,setsar=sar=40/33 -refs 10 -x264-params crf=20 -x264opts bluray-compat=1:vbv-bufsize=30000:vbv-maxrate=40000lices=4pen-gop=1:force-cfr=1:colorprim=smpte170m:colormatrix=smpte170m:tr ansfer=smpte170m -acodec -c:a ac3 -b:a 192k -s 720x480 -aspect 16:9 "%%~na.x264.veryslow.20.Level.32.mp4"
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  2. You literally cannot throw away more than 85% of your image and maintain "intact quality." Try encoding short samples at your settings and see if they are acceptable for your purposes.
    Last edited by smrpix; 11th Apr 2019 at 09:47.
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  3. Originally Posted by smrpix View Post
    You literally cannot throw away more than 75% of your image and maintain "intact quality." Try encoding short samples at your settings and see if they are acceptable for your purposes.
    Thank you for the information
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