ISCC - Video-Code#
A similarity preserving hash for video content
The Content-Code Video is generated from MPEG-7 video frame signatures. The iscc-sdk uses ffmpeg to extract frame signatures with the following command line parameters:
$ ffmpeg -i video.mpg -vf fps=fps=5,signature=format=xml:filename=sig.xml -f null -
The relevant frame signatures can be parsed from the following elements in sig.xml:
<FrameSignature>0 0 0 1 0 0 1 0 1 1 0 0 1 1 ...</FrameSignature>
Tip
It is also possible to extract the signatures in a more compact binary format. But the format requires a custom binary parser to decode the frame signaturs.
gen_video_code(frame_sigs, bits = ic.core_opts.video_bits)
#
Create an ISCC Video-Code with the latest standard algorithm.
Parameters:
| Name | Type | Description | Default |
|---|---|---|---|
frame_sigs |
ic.FrameSig
|
Sequence of MP7 frame signatures |
required |
bits |
int
|
Bit-length resulting Instance-Code (multiple of 64) |
ic.core_opts.video_bits
|
Returns:
| Type | Description |
|---|---|
dict
|
ISCC object with Video-Code |
gen_video_code_v0(frame_sigs, bits = ic.core_opts.video_bits)
#
Create an ISCC Video-Code with algorithm v0.
Parameters:
| Name | Type | Description | Default |
|---|---|---|---|
frame_sigs |
ic.FrameSig
|
Sequence of MP7 frame signatures |
required |
bits |
int
|
Bit-length resulting Video-Code (multiple of 64) |
ic.core_opts.video_bits
|
Returns:
| Type | Description |
|---|---|
dict
|
ISCC object with Video-Code |
soft_hash_video_v0(frame_sigs, bits = ic.core_opts.video_bits)
#
Compute video hash v0 from MP7 frame signatures.
Parameters:
| Name | Type | Description | Default |
|---|---|---|---|
frame_sigs |
ic.FrameSig
|
2D matrix of MP7 frame signatures |
required |
bits |
int
|
Bit-length of resulting Video-Code (multiple of 64) |
ic.core_opts.video_bits
|