OCR Body Cam Transcripts: Search What Was Said on Video

You can OCR a body cam transcript when it reaches you as a scanned or image-only PDF. OCR reads the printed page and gives you searchable text with the speaker labels and timestamps that were typed on it. It does not listen to the video. Someone, or some software, must already have written the transcript.

That distinction decides what you can expect. OCR on body cam transcripts is a way to search and quote a document about a recording. It tells you nothing about the recording that the transcriber did not put on the page.

Speaker labels let you jump to the exchange where someone mentions a search warrant, reasonable suspicion, or a custodial interrogation, and to any talk of search and seizure. Quote those lines only after you compare each hit with the scanned page and then with the recording. Do that check before you cite a timestamp at a preliminary hearing or in a plea bargain discussion.

Does a body cam transcript need OCR at all?

A body cam transcript needs OCR only if you cannot select its text. A transcript delivered as a word processor file, or as a PDF saved from one, is already searchable. A transcript that was printed and scanned, faxed, or stamped with Bates numbers as page images is a picture, and OCR is what makes it text.

Test it in ten seconds: open the file, press Ctrl+F and search for a word you can see on the page, such as "Officer". If nothing is found, the pages are images.

Three situations come up in criminal discovery:

In the third case, anything you see on screen in the video, such as the date and time overlay in the corner of the frame, is also outside what document OCR does unless you capture a still frame and treat that image as a page.

A scanned transcript can come from the prosecution, from a transcription service the agency used, or from a prior hearing where it was marked as an exhibit. Find out which, because who prepared it affects how much checking it needs.

What is on the page of a body cam transcript?

A body cam transcript page carries a header that identifies the recording, a column of speaker labels, the words spoken, and usually time markers. Many also carry bracketed notes for things that are not speech. The layout varies with whoever prepared it.

Look for these parts before you convert, so you know what to check afterward:

• Header or cover page. Case or incident number, the officer whose camera recorded, the date, the name of the video file, the recording's length, and who transcribed it.
• Speaker labels. OFFICER DELGADO:, MALE 1:, UNKNOWN FEMALE:, DISPATCH:. Labels for civilians are often generic, and the same person may be MALE 1 in one transcript and SUBJECT in another.
• Time markers. Either elapsed time from the start of the recording, such as [00:04:17], or clock time. Some transcripts mark every line, some every thirty seconds, some not at all.
• Bracketed notes. [inaudible], [crosstalk], [radio traffic], [siren]. These are the transcriber telling you where the page is incomplete.
• Line numbers. Some transcripts use the court reporter layout with numbered lines down the left margin. Others are plain paragraphs.
• A certificate. A statement at the end, sometimes signed, about who prepared the transcript and how.

Layouts come in two broad shapes. One is a script: label, colon, speech, each turn starting a new line. The other is a table with columns for time, speaker and text. The table shape converts to a spreadsheet, which is handy for sorting by speaker.

Speaker labels and timestamps after converting a body cam transcript

Speaker labels and timestamps come through conversion as ordinary text, because that is what they are on the page. What can change is their position. A timestamp printed in the margin may land on its own line, or on the line above or below the speech it belongs to.

Check these after conversion:

1. Labels still start their lines. If a label has been joined to the end of the previous speaker's sentence, a search still finds it, but a quote copied from that passage will attribute words to the wrong person.
2. Similar labels are still distinct. MALE 1 and MALE 2 differ by one digit, and the lowercase letter l is easily confused with it. Search each label and compare the counts with a manual count on two or three pages.
3. Timestamp digits are right. 00:14:07 and 00:14:01 are different moments. Read against the image any time you plan to cite.
4. Bracketed notes kept their brackets. [inaudible] without brackets reads as if someone said the word.
5. Margin line numbers have not mixed into the speech. Whether they stay in their column depends on the layout, as the section on whether page and line numbers survive conversion explains for deposition transcripts.

If the transcript is laid out as a table, export it to Excel or CSV and you get one row per turn. Add a filter and you can read everything one speaker said in order, or everything said between two times. In Schema Law those two formats are in every plan, along with searchable PDF, Word and plain text, as the formats list shows.

Checking a body cam transcript against the recording

Check a body cam transcript against the recording by playing the passages you intend to rely on and reading along. Two layers of error are possible: the transcriber's, in hearing the audio, and the OCR's, in reading the page. The recording corrects the first. The scanned image corrects the second.

Keep the layers apart, because they are fixed differently. If the converted text says "I didn't see him" and the scanned page says the same, conversion was faithful, and any dispute is with the transcript. If the page says "I did see him", the conversion dropped something and you correct your copy.

A checking routine for the passages that matter:

1. Find the passage in the converted text and note its timestamp.
2. Compare the converted words with the scanned page. Fix your working copy if they differ.
3. Play the recording from about fifteen seconds before the timestamp.
4. Listen for words the transcript omits, words marked inaudible that you can make out, and speech attributed to the wrong person.
5. Write down the video file name and elapsed time next to your note, so anyone can replay the same seconds.

Pay particular attention to overlapping speech. A transcript has to put two voices in some order, and the order it picks can change how an exchange reads.

Remember what the transcript is. In federal court, Federal Rule of Evidence 1002 states that "an original writing, recording, or photograph is required in order to prove its content" unless the rules or a federal statute provide otherwise. State rules and local practice on transcripts of recordings differ, so check yours. For document handling the point is simple: treat the transcript as a finding aid for the video. When you do quote from it, the routine in the guide on how to quote text from a scanned PDF keeps the words exact.

Searching body cam transcripts alongside the police reports

Search body cam transcripts together with the police reports by putting the converted files in one folder and running the same terms across all of them. The report is the officer's later account. The transcript is what was recorded as it happened. Reading them side by side shows where the two differ.

Converting the reports themselves, with their form fields and narrative blocks, is covered in the post on OCR for police reports. Once both sets are searchable, try terms like these across the folder:

• words of consent and refusal: "search", "mind if", "go ahead", "no"
• words of custody: "free to leave", "detained", "under arrest", "hands"
• warnings: "right to remain", "attorney", "lawyer"
• observations the report relies on: "smell", "odor", "furtive", "weapon"
• each person's name, and each generic label

Then set what you find next to the report's narrative.

The entries are invented. A row like the first one sends you straight to the recording, which is exactly what the transcript is for.

When several officers wore cameras, each transcript runs on its own clock. Line them up by an event every camera caught, such as a radio call, before you compare times. And expect the same words to be transcribed differently from two cameras, since each microphone heard the scene from a different place.