Audio and video
Submit the original file without resaving, along with information about the recording, if available.
Storage media
Preserve the phone, recorder, memory card or other recording source if the examination requires it.
Samples
Voice comparison may require suitable speech samples and information about the conditions in which they were obtained.
Documents
If available: an investigative order, court ruling, questions, a procedural record or a previously prepared report for review.
Large files
The form accepts up to ten files of 10 MB each, up to 15 MB in total. Arrange the transfer of large recordings and physical storage media separately.
Terms for submitting materials
How to identify disputed audio and video segments
It is useful to attach a brief inventory to the recording. For each file, specify the source, device or platform, the known method of saving and the period relevant to the task. If the recording was obtained through another person, state that specific route of receipt. The initial file and a later copy must remain distinguishable within the set.
Compile a list of segments: file name, start and end positions, the question and any necessary explanations. For example, it may be necessary to establish the words in a particular utterance, compare a voice with a submitted sample or check the continuity of a specific section. A single general request to “check the entire video” does not show which specialist actions are actually needed.
- Submit the complete available file and identify the selected segment in the inventory.
- For a multichannel recording, preserve the channels and information about their purpose.
- If different exports exist, preserve them with an explanation of the differences.
- Attach the transcript, subtitles and your own comments separately from the recording.
- For voice comparison, describe the provenance of the samples and the conditions in which they were obtained.
Do not enhance the only preserved copy to make it sound clearer. If processing has already been performed, disclose it and preserve any available version from before processing. Filtered audio may be useful as supporting material, but its creation history must be clear. It is better to mark unintelligible passages explicitly in a prepared transcript rather than add presumed words on the speaker's behalf.