Lesson 7 of 7 · about 15 minutes
Captions, Color Basics and Export
You'll be able to
- Decide between burned-in and sidecar captions for a given platform
- Write and check an SRT caption file
- Do a basic correction pass: exposure, white balance, matching shots
- Export H.264 MP4 with matched frame rate and a sensible bitrate, or hit a file size target
The edit is locked. Three jobs remain before anyone sees it: text for people watching with the sound off, a quick pass to make the clips look like they belong together, and a file that plays correctly wherever it lands. None of them is glamorous. All of them show when skipped.
Captions: burned-in or sidecar
A lot of video gets watched on mute, at least for the first seconds. Captions are also how deaf and hard-of-hearing viewers get your story at all. The W3C's accessibility guidance defines captions as a text version of the speech and the non-speech audio needed to understand the content, and WCAG Success Criterion 1.2.2 asks for captions on all prerecorded audio in synchronized media. Caption every video. Not optional.
The choice is how they travel:
| Burned-in (open) | Sidecar (closed) | |
|---|---|---|
| What it is | Text rendered into the picture | A separate text file, such as .srt, uploaded with the video |
| Viewer control | None; always on | Turn on or off, sometimes resize or translate |
| Fixing a typo | Re-export the whole video | Edit the text file, re-upload in seconds |
| Works everywhere | Yes, it is just pixels | Only where the player accepts caption files |
My rule: sidecar wherever the platform accepts a file, burned-in where it does not or where people scroll with sound off. YouTube accepts SubRip (.srt) and suggests it, along with SubViewer (.sbv), to people new to caption files, since they hold only timing and text and open in any text editor (as of October 2026). Short vertical feeds are where burned-in captions earn their keep. Some apps also auto-generate captions. Check them: auto captions mangle names and numbers, which are the two things a news story cannot get wrong.
The AV craft chapter Text people can actually read covers caption style in detail: two lines at most, about 40 characters per line, breaks at natural phrases, held long enough to read. It also covers safe areas, which is where burned-in captions go wrong on vertical video: keep them clear of the bottom fifth and right edge, where the app's buttons sit.
Example: an SRT file
1
00:00:00,400 --> 00:00:03,100
My bill went from
48 to 59 dollars.
2
00:00:03,300 --> 00:00:07,800
The Pell Creek board votes
on the rate increase November 12.
Number, time range (hours:minutes:seconds,milliseconds), one or two lines, blank line. That is the whole format.
AVPrep3 lists transcription, cue editing, SRT import and export and burn-in among its caption features, so you can make one SRT, upload it as a sidecar to YouTube and burn the same cues into the vertical version. Proofread every line against the audio. Spell every name the way its owner spells it.
Color basics: correct, then stop
Color work comes in two stages. Correction makes clips accurate and makes them match. Grading adds a creative look. For journalism, correction is nearly always enough, and a heavy look can make a factual piece feel like an ad.
A correction pass, clip by clip, using your editor's brightness, contrast, saturation and color or white balance controls (VideoStudio has brightness, contrast, saturation, gamma and hue; AVPrep3 has color controls on video clips):
- Exposure. Is the face bright enough to read, without white blown-out patches? Adjust brightness or exposure until it is.
- Contrast. Blacks should look black, not gray haze. A little contrast often fixes footage that looks flat.
- White balance. Find something that should be white or gray: a shirt, a wall, paper. Nudge the color or temperature until it is neutral. Skin should look like skin, not orange and not gray-blue.
- Match. Put the resident's interview next to her B-roll in the kitchen. Do they look like the same room? Adjust the odd one out.
- Saturation. Leave it alone, or nudge it a little. Global saturation turns skin orange first.
Judge on more than one screen. Your laptop, your phone, a TV if you have one. The chapter Why your export looks different from your edit covers waveforms, vectorscopes and the levels mismatch behind most washed-out exports, if you want to go further. And remember lesson 3: correction can shift a whole shot, but it cannot fix a face lit by two different colors.
Export settings
The AV craft chapter Getting it out the door has a settings table that works almost everywhere. The short version, cross-checked against YouTube's own recommended upload settings (as of October 2026):
| Setting | Use |
|---|---|
| Container | MP4, with "fast start" (moov atom at the front) if your exporter offers it |
| Video codec | H.264, High profile |
| Frame rate | Match the source. Do not convert 30 to 60 or 24. |
| Resolution | 1080p for most delivery; 1080x1920 for vertical |
| Video bitrate | YouTube lists 8 Mbps for 1080p at 24 to 30 fps and 12 Mbps at 48 to 60 fps for SDR uploads. The AV chapter suggests 10 to 16 Mbps at 1080p, or a quality setting (CRF around 20), for a master that survives re-encoding. |
| Audio | AAC, 48 kHz (YouTube's listed sample rate). YouTube recommends 384 kbps for stereo; the AV chapter's 192 kbps is fine for speech and music beds. |
Why upload above the platform's own number? Every platform re-encodes your upload. Giving its encoder a clean, generous source means less damage. A file that is already squeezed hard looks worse after the platform squeezes it again.
Frame rate matching deserves the emphasis. YouTube's guidance says to encode at the frame rate you recorded. Exporting 30 fps footage at 60 does not make it smoother; it just repeats frames and doubles the data. Exporting it at 24 drops frames and makes motion judder.
When there is a size limit
Email, messaging apps and some upload forms have hard caps. Personal Gmail attachments, for instance, top out at 25 MB (as of October 2026). File size is bitrate times duration, so you can work the number out:
Example: a 60-second clip under 25 MB
25 MB is 200 megabits (8 bits to a byte). Spread over 60 seconds, that is about 3.3 megabits per second for everything. Take out 128 kbps for audio and leave a 5 percent safety margin, and the video gets roughly 3 Mbps. That is too thin for great-looking 1080p of a busy scene, but fine for 720p or a talking head.
Rather than doing that math by hand, use StudioConverter. It compresses to a target file size in MB, with optional two-pass encoding for closer accuracy, and can cap resolution and frame rate. Its loudness tool sets a LUFS target with a peak limit if the audio needs it. AVPrep3's export dialog also offers a target file size and platform presets.
If the result looks bad, the fixes in order of least damage: shorten the video, drop to 720p, use two-pass. The AV chapter notes that 720p at a low bitrate usually looks better than 1080p at the same bitrate, because the encoder spreads the same data over fewer pixels.
Before you publish
Watch the exported file, start to finish, not the timeline. Check the first five seconds and the last two (exporters love to clip the ending). Read the captions on a phone. Listen on the phone speaker at half volume. Then save three things in the project folder: the project file, the source media, and one high-quality export without platform crops or burned-in captions. That last one is your archive master; you will want it the day someone asks for a different version.
Try it
- Take the 45-second cut from lesson 6.
- Write an SRT file for it by hand or with AVPrep3's transcription, then proofread every line against the audio.
- Do a correction pass: exposure, white balance and matching between interview and B-roll.
- Export a horizontal master: H.264 MP4, source frame rate, 1080p, around 10 to 16 Mbps, AAC 48 kHz.
- Run the master through StudioConverter with a target of 8 MB. Compare the two files side by side on a phone and write down where the small one falls apart first.
Export checklist
- Captions proofread: names, numbers, spelling
- Sidecar SRT for platforms that take it; burned-in version for feeds that need it
- Clips corrected and matched; skin looks like skin
- MP4, H.264, frame rate matches the source
- Bitrate at or above the platform's recommendation, or file under the size cap
- Exported file watched start to finish
- Archive master and project saved with the media
Pictures, Numbers and Infographics
YouTube reaches more than four in five U.S. adults, more than any other platform Pew tracks. These figures show who watches, where they get news, and why captions matter for a large share of any audience.
By the numbers
- 84%: of U.S. adults say they ever use YouTube (2025), up from 73% in 2018. Pew Research Center, Social Media Fact Sheet, 2025
- 95% vs. 64%: YouTube use among adults 18 to 29 compared with adults 65 and older (2025). Pew Research Center, 2025
- 35%: of U.S. adults regularly get news on YouTube, second only to Facebook at 38% (2025). Pew Research Center, Social Media and News Fact Sheet, 2025
- 64%: of U.S. adults get news from television at least sometimes, including 32% often (2025). Pew Research Center, News Platform Fact Sheet, 2025
- 37.5 million: American adults, about 15% of those 18 and over, report some trouble hearing. NIDCD, Quick Statistics About Hearing
- 30 million: people in the U.S. ages 12 and older (13%) have hearing loss in both ears on standard exams. NIDCD, Quick Statistics About Hearing
Check yourself
1. You are posting the same video to YouTube and as a vertical reel. Which caption plan makes sense?
YouTube accepts SRT files, which viewers can turn off and the platform can translate. Feeds watched with sound off often need text in the picture.
2. What is the main drawback of burned-in captions?
Burned-in text is pixels. A sidecar file is plain text you can fix in seconds.
3. Your clips came from a phone shooting 30 fps. What frame rate should the export use?
Changing the rate on export forces the encoder to drop or repeat frames. YouTube's own guidance says to match the original recording.
4. What is the right order for color work?
Correction makes clips accurate and consistent. A look added on top of uncorrected clips just exaggerates their differences.
5. You need a 60-second video under 25 MB to email from a personal Gmail account. Roughly what total bitrate does that allow?
25 MB is 200 megabits. Divided by 60 seconds that is about 3.3 Mbps for video and audio together, minus a margin.
6. YouTube's recommended SDR bitrate for a 1080p upload at 24 to 30 fps is about what, as of October 2026?
YouTube's help page lists 8 Mbps for 1080p at standard frame rates and 12 Mbps at 48 to 60 fps.
Terms in this lesson
- Burned-in (open) captions
- Caption text rendered into the video picture; always visible and cannot be turned off.
- Sidecar (closed) captions
- Captions in a separate file, such as SRT, that the player shows or hides.
- SRT
- SubRip, a plain-text caption format: a number, a time range, the caption lines, a blank line.
- Color correction
- Adjusting exposure, contrast and white balance so clips look accurate and match each other.
- H.264
- The most widely supported video codec, usually delivered in an MP4 file.
- Bitrate
- How much data per second the file uses for video or audio, measured in megabits or kilobits per second.
Sources
- YouTube Help: Recommended upload encoding settings checked 2026-10
- YouTube Help: Supported subtitle and closed caption files checked 2026-10
- W3C WAI: Captions/Subtitles checked 2026-10
- Gmail Help: Attachment size limits checked 2026-10