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  1. Is there any program to find what camera shot some downloaded footage. Here is the media info. is there any program like media info to tell what camera or even the sensor size

    General
    Complete name : C:\Users\movie.mp4
    Format : MPEG-4
    Format profile : Base Media
    Codec ID : isom (isom/iso2/avc1/mp41)
    File size : 12.6 MiB
    Duration : 1 min 1 s
    Overall bit rate : 1 706 kb/s
    Writing application : Lavf57.25.100

    Video
    ID : 1
    Format : AVC
    Format/Info : Advanced Video Codec
    Format profile : Main@L3.1
    Format settings, CABAC : Yes
    Format settings, ReFrames : 4 frames
    Codec ID : avc1
    Codec ID/Info : Advanced Video Coding
    Duration : 1 min 1 s
    Bit rate : 1 542 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) : 0.067
    Stream size : 11.4 MiB (90%)
    Writing library : x264 core 118
    Encoding settings : cabac=1 / ref=2 / deblock=1:0:0 / analyse=0x1:0x111 / me=hex / subme=6 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=1 / 8x8dct=0 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=6 / 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=1 / keyint=250 / keyint_min=25 / scenecut=40 / intra_refresh=0 / rc_lookahead=30 / rc=crf / mbtree=1 / crf=22.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / vbv_maxrate=2000 / vbv_bufsize=2500 / crf_max=0.0 / nal_hrd=none / ip_ratio=1.40 / aq=1:1.00
    Language : English

    Audio
    ID : 2
    Format : AAC
    Format/Info : Advanced Audio Codec
    Format profile : LC
    Codec ID : 40
    Duration : 1 min 1 s
    Bit rate mode : Constant
    Bit rate : 160 kb/s
    Channel(s) : 2 channels
    Channel positions : Front: L R
    Sampling rate : 48.0 kHz
    Frame rate : 46.875 FPS (1024 spf)
    Compression mode : Lossy
    Stream size : 1.18 MiB (9%)
    Language : English
    Default : Yes
    Alternate group : 1
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  2. aBigMeanie aedipuss's Avatar
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    if it's the original file from the camera it's possible there is exif data. but if it's downloaded from anywhere like youtube facebook etc. no. there are free exif data viewers you can get and use.
    --
    "a lot of people are better dead" - prisoner KSC2-303
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  3. That is not the original file from the camera. It was re-encoded by x264. Any exif data from the original file is probably gone.
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  4. Originally Posted by aedipuss View Post
    if it's the original file from the camera it's possible there is exif data. but if it's downloaded from anywhere like youtube facebook etc. no. there are free exif data viewers you can get and use.
    Thanks. i have an exif viewer for photos but it does not work for video. What does writing library mean in media info? The codec used to write?
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  5. aBigMeanie aedipuss's Avatar
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    writing library is usually the program that encoded the video. here's an original video with exif data.

    Click image for larger version

Name:	2017-06-18_102700.png
Views:	185
Size:	19.4 KB
ID:	41941
    --
    "a lot of people are better dead" - prisoner KSC2-303
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  6. Originally Posted by aedipuss View Post
    writing library is usually the program that encoded the video. here's an original video with exif data.

    Image
    [Attachment 41941 - Click to enlarge]
    When I do media info of a clip from Nikon D3200 there is no writing application or camera listed

    General
    Complete name : C:\Users\sample.MOV
    Format : MPEG-4
    Format profile : QuickTime
    Codec ID : qt 2007.09 (qt /niko)
    File size : 18.2 MiB
    Duration : 6 s 757 ms
    Overall bit rate : 22.6 Mb/s
    Encoded date : UTC 2016-03-09 13:47:37
    Tagged date : UTC 2016-03-09 13:47:37
    NCDT : NCTG

    Video
    ID : 1
    Format : AVC
    Format/Info : Advanced Video Codec
    Format profile : High@L4
    Format settings, CABAC : Yes
    Format settings, ReFrames : 2 frames
    Format settings, GOP : M=3, N=12
    Codec ID : avc1
    Codec ID/Info : Advanced Video Coding
    Duration : 6 s 757 ms
    Bit rate : 20.7 Mb/s
    Width : 1 920 pixels
    Height : 1 080 pixels
    Display aspect ratio : 16:9
    Frame rate mode : Constant
    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) : 0.417
    Stream size : 16.7 MiB (92%)
    Language : English
    Encoded date : UTC 2016-03-09 13:47:37
    Tagged date : UTC 2016-03-09 13:47:37
    Color range : Full
    Color primaries : BT.709
    Matrix coefficients : BT.601
    colour_primaries_Original : BT.709
    transfer_characteristics_Original : BT.470 System M
    matrix_coefficients_Original : BT.601

    Audio
    ID : 2
    Format : PCM
    Format settings, Endianness : Little
    Format settings, Sign : Signed
    Codec ID : sowt
    Duration : 6 s 757 ms
    Bit rate mode : Constant
    Bit rate : 1 536 kb/s
    Channel(s) : 2 channels
    Channel positions : Front: L R
    Sampling rate : 48.0 kHz
    Bit depth : 16 bits
    Stream size : 1.24 MiB (7%)
    Language : English
    Encoded date : UTC 2016-03-09 13:47:37
    Tagged date : UTC 2016-03-09 13:47:37
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  7. aBigMeanie aedipuss's Avatar
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    as you found out not all cameras add exif data. you could try a hex editor to look inside the file to see if there's other hidden data. usually at the beginning or end of the file.
    --
    "a lot of people are better dead" - prisoner KSC2-303
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  8. If you suspect a particular camera you can compare its characteristics, such as its fixed-pattern noise, against the video in question - if the video isn't too heavily compressed.

    BTW, since modern printers add hidden steganographic codes, I wouldn't be surprised if cameras did too.
    Last edited by raffriff42; 18th Jun 2017 at 18:35. Reason: accidently a word 'compressed'
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  9. Originally Posted by raffriff42 View Post
    If you suspect a particular camera you can compare its characteristics, such as its fixed-pattern noise, against the video in question - if the video isn't too heavily compressed.

    BTW, since modern printers add hidden steganographic codes, I wouldn't be surprised if cameras did too.
    steganographic codes wouild only work if the person buying the printer was asked for their ID
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  10. Originally Posted by Sounds View Post
    steganographic codes wouild only work if the person buying the printer was asked for their ID
    It exists so the Secret Service can determine if your printer was used to make counterfeit bills -- after you have been caught using them. Using counterfeit bills isn't a crime if you don't know the bills are counterfeit. Showing that your printer printed the bills makes it much harder for you to claim ignorance.
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  11. Is there a program for the lay person to read those codes?
    Extraordinary claims require extraordinary evidence -Carl Sagan
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  12. wikipedia:Digital_watermarking#Cameras
    Blythe and Fridrich also have worked on SDC* in 2004 for a digital camera that would use lossless watermarking to embed a biometric identifier together with a cryptographic hash.
    * note SDC = "Secure Digital Camera", meaning it is traceable & auditable; not to be confused with the similarly-named "Secure Digital" (SD) memory cards.

    So the technology is there, but not implemented
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  13. Member
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    Originally Posted by Sounds View Post
    When I do media info of a clip from Nikon D3200 there is no writing application or camera listed
    MediaInfo occasionally misses things. Try FFprobe (from the FFmpeg suite) and ExifTool.
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