Submitting & Downloading Sample Data

Data Repositories

Sample Dump Telegram Channel

Google Shared Drive Public Samples Folder

Decode Team - The Internet Archive

DomesDay86 Media - The Internet Archive / GitHub Index

Sample Data Doc

There are no limits on length type or content type.

FLAC compressed captures are preferred due to ease of upload and download for those of less fortunate network abilities.

If possible include VCR/Player/Camera used and or original source of generation if known, feel free to create relevant documents separately in a txt file or md format for this purpose one per each media article, or spreadsheet format for larger file collections.

Submitting Context

Please include your notes in a plain text .txt or markdown formatted .md file, google docs are also allowed but standard text data is preferred, due to ease of traslation & migration doing both or all 3 is fine.

Naming Rules

Naming should be the following or similar to keep files orderly and easy to copy/paste and index.

Both - and _ are legal separators, ware as ( & ) are illegal, so stick to the examples provided below.

Format: Username_Media-Name-MediaType-TV_system-Capture_Type-Bit_Depth-SampleType

Example 1: Harrypm_Colourbars_vhs_pal_CX-White-Stock_cxadc.betamax

Example 2: Harrypm_Dialog2001_svhs_ntsc_CX-Blue-Stock_Gain-22_cxadc.u8

Example 3: Harrypm_THX_ld_pal_CX-White-Modified_Gain-18_16bit-20mhz.u16

Example 4: Harrypm_Test-43_vhs_pal_DdD_gain-8.5.ldf

Example 4: Harrypm_Holiday_vhs_pal_DdD_gain-8.5_16mhz_8bit.vhs

Tape format, bit depth and sample rate should always be stated unless .ldf/.u16/.u8 is used which implies the bit depth by its extension type.

Files with just .flac/.oga and so on should always have descriptive names.

Help

DomesDay Duplicator (DdD) Gain Config states.

Configuration	Switch Position	Gain
15	1111	2.02
7	0111	2.17
11	1011	2.27
13	1101	2.45
3	0011	2.54
14	1110	2.59
5	0101	2.79
6	0110	3.02
9	1001	3.04
10	1010	3.34
1	0001	3.8
12	1100	4
2	0010	4.4
4	0100	6
8	1000	8.5

CXADC Bit depth/Sample rate Designators:

Decoding Command	Sample Rate
--cxadc	28.6 MHz/8-bit (8fsc)
--cxadc3	35.8 MHz/8-bit (10fsc)
--10cxadc	14.3 MHz/16-bit (4fsc)
--10cxadc3	17.9 MHz/16-bit (5fsc)

*Note 35.8 MHz/8-bit is not recommended due to up-sampling, no benefits just wasted space.

Capture Formats

Capture Format	Extension	Compression Type
DdD 10-bit Packed	.lds	10-bit Packed
DdD 16-bit Singed	.s16	16-bit RAW
DdD 16-bit FLAC	.ldf	16-bit FLAC
CX Card 8-bit	.u8	8-bit RAW
CX Card 16-bit	.u16	16-bit RAW

List of flac compressed naming designators:

Format	Compressed Extension	Compression Type	Channels
Composite	.cvbs	FLAC	1
VHS	.vhs	FLAC	1
S-VHS	.svhs	FLAC	1
Video8	.video8	FLAC	1
Umatic	.umatic	FLAC	1
Umatic SP	.bvu	FLAC	1
Hi8	.hi8	FLAC	1
BetaMax	.betamax	FLAC	1
Video2000	.v2000	FLAC	1
SMPTE 1” Type C	.type-c	FLAC	1
SMPTE 1” Type B	.type-b	FLAC	1
EIAJ	.eiaj	FLAC	1
BetaCam	.betacam	FLAC	2
BetaCam SP	.betacamsp	FLAC	2

Always include the sample rate of a compressed capture if using the format extension naming method, i.g 20msps 10-bit.

With Betacam, betacam-y and betacam-c has to be discriminated, unless you have both channels interleaved or somthing, betacam is still in alpha workflow wise, now that syncronised CXADC capture is viable.

With βetamax be sure to include if βI βII or βIII speed.

Etc more formats will be added as captures are obtained for testing.

Current FLAC compression standards are:

40msps 8-bit, 16-bit & 10-bit packed - Decodes automatically (DomesDayDuplicator Stock) (40mhz CX Card Crystal Mod)

20msps 8-bit - Requires -f 20 (Down sampled File)

16msps 8-bit - Requires -f 16 (Down sampled File)

CXADC Sample Rates:

17.9msps 16-bit - Requires --10cxadc3

14.3msps 16-bit - Requires --10cxadc

20msps 16-bit - Requires -f 20 (40mhz CX Card Crystal Mod)

16msps 8-bit - Requires -f 16

FLAC Compression & Resampling Scripts

For DomesDayDuplicator captures (might need ./ in start of command)

Command: ld-compress your-capture-name

For CXADC captures there is a wiki doc with a list of pre-made commands

Please visit Tony’s GNRC flowgraph wiki for re-sampling/conversion scripts

OGG is no longer critically needed for archives due to flac being updated. - September 2022

Mass Archive Submissions

We all love large datasets for testing a good example of this is Itewreed’s RF Archive witch has 5.7 Terabytes (TB) of German off-air TV recordings.

Sadly however to changes in Google Workspace as of July 2023 we no longer can accept mass submissions to the google shared drive, we do accept physical submissions in LTO5/SSD/HDD/Optical with index files on the shared drive however, sadly due to the 5TB cap the public shared drive will be limited to 1-2TB of active data at any given time for the foreseeable future.

Checksums

Checksums are recommended typically CRC & Sha3-512 for verifying data integrity are appreciated in separate files & index names alongside captures to verify a clean file upload/download and local transferring.

Example of a CRC checksum hash embedded: Testbars-PAL-CXADC-[248955C9].svhs

Example of a Sha3-512 checksum: b984fa07139ddaf2a1c4b8c6b2a05ca5c4c0e1119616ce329bdb72916c86f107

Easy to use GUI checksum tools RapidCRC (Windows) GTKHash (Windows & Linux)

If making optical archives or using the .ISO format then look at Dvdisaster for embedding/creating ECC data and verifying discs.