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General Discussion: how to check if a video was modified

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Mediainfo for the day when the change occurred, 1st feb Format : MPEG-4 Format profile : Base Media Codec ID : isom File size : 861 MiB Duration : 5h 59mn Overall bit rate mode : Variable Overall bit rate : 335 Kbps Writing application : Lavf55.22.100 Video ID : 1 Format : AVC Format/Info : Advanced Video Codec Format profile : High@L1.3 Format settings, CABAC : Yes Format settings, ReFrames : 1 frame Format settings, GOP : M=1, N=40 Codec ID : avc1 Codec ID/Info : Advanced Video Coding Duration : 5h 59mn Bit rate : 312 Kbps Width : 320 pixels Height : 240 pixels Display aspect ratio : 4:3 Frame rate mode : Variable Frame rate : 10.000 fps Color space : YUV Chroma subsampling : 4:2:0 Bit depth : 8 bits Scan type : Progressive Bits/(Pixel*Frame) : 0.406 Stream size : 801 MiB (93%) Writing library : x264 core 140 r2377 1ca7bb9 Encoding settings : cabac=1 / ref=1 / deblock=1:0:0 / analyse=0x3:0x113 / me=hex / subme=6 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=0 / me_range=16 / chroma_me=1 / trellis=0 / 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=0 / weightp=2 / keyint=40 / keyint_min=2 / scenecut=40 / intra_refresh=0 / rc_lookahead=40 / rc=crf / mbtree=1 / crf=23.0 / qcomp=0.60 / qpmin=10 / qpmax=51 / qpstep=4 / ip_ratio=1.40 / aq=1:1.00 Audio ID : 2 Format : AAC Format/Info : Advanced Audio Codec Format profile : LC Codec ID : 40 Duration : 5h 59mn Duration_LastFrame : -56ms Bit rate mode : Variable Bit rate : 21.3 Kbps Maximum bit rate : 128 Kbps Channel count : 2 channels Channel positions : Front: L R Sampling rate : 8 000 Hz Compression mode : Lossy Stream size : 54.8 MiB (6%)

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