AI comparison of automatic extraction of long video highlights: What is the difference between 3 hours and 8 hours?
If you are watching an 8-hour replay, the AI for automatically extracting long video highlights varies depending on the upper input length limit, minute-by-minute billing, and selection signal. We compared Opus Clip 10 hours, 30GB, Vizard 600 minutes (10 hours), 10GB, and ClipSpray 24-hour cap and monthly fee.
ClipSpray Team
ClipSprayKey takeaways
- Input upper limits are 10 hours, 30 GB for Opus Clip, 600 minutes (10 hours), 10 GB for Vizard, and 24 hours for ClipSpray. All three 8-hour broadcasts will pass in length, but depending on encoding, file size may be limited.
- If the billing is based on 'minutes of uploaded video', 480 minutes per 8-hour broadcast, 5 times a week, or 20 times a month, 9,600 minutes will be deducted. If you broadcast a long broadcast every day, it is correct to calculate the rate based on the number of results, not the minutes.
- The reason why the results are different even if the same broadcast is broadcast is a selection signal. Tools that read only the screen and audio structurally miss the moments of silent admiration from viewers, while tools that view chat and time stamps together capture the actual reaction points.
- For long videos, candidates are concentrated at the beginning of the broadcast because relative scores are given based on the entire video. It is better to go through the list of candidates in chronological order rather than in score order, and if there are zero candidates for the second half of the section, cut off only that section and re-upload it.
- For edited videos under 30 minutes, you only need to compare prices and processing speeds, and for live full videos over 3 hours, you only need to check three things: upper limit on input length, per-minute billing, and whether chat signals are used.
For an 8-hour replay of Tzizik, Opus Clip (10 hours, 30GB), Vizard (600 minutes, 10GB), and ClipSpray (24 hours) are all within the upper length limit. The difference is the file size and the credits lost per upload minute. AI that automatically extracts long video highlights wins on these two numbers, not the list of features.
Why does a 30-minute video look similar no matter which tool is used?
There are not many sections in the 30-minute edit that can be considered candidates. Whether you're looking for a point where the volume fluctuates or a section where the speaking speeds up, the point you're pointing to is ultimately the same. This is why the comparison article, which was tested only with a short video, ends with “Either tool performs well.”
Live full video is a different story. In a 4-6 hour broadcast per episode, the number of candidate sections increases dozens of times, and the standards for deciding which ones to move to the top are different for each tool. This is where the section begins where the results are completely different even if you add the same VOD replay.
Once you decide which section your video is in, the number of items to compare is reduced from five to two or three.
- Edited version under 30 minutes: Just comparing price and processing speed is sufficient.
- 1~2 hour game: Check 16:9 horizontal clip quality and Korean subtitle accuracy
- Live full video over 3 hours: Check input length limit, minute-by-minute billing, and use of chat signal
- Over 6 hours of chat or marathon: Check whether a report is provided on the distribution of candidates by time zone and the basis for selection.
Will the 8-hour replay be uploaded in the first place?
The first thing that comes up in AI for automatically extracting highlights from long videos is not the function, but the hard limit. The maximum video capacity that Opus Clip can accept is 10 hours and 30GB (Opus Clip document ), and Vizard's limit is 600 minutes (10 hours) and 10GB (Vizard document ). ClipSpray analyzes broadcast replays up to 24 hours long from start to finish (ClipSpray).
| tools | maximum input length | File size upper limit | 12-hour run or marathon |
|---|---|---|---|
| Opus Clip | 10 hours | 30GB | Impossible |
| Vizard | 600 minutes (10 hours) | 10GB | Impossible |
| ClipSpray | 24Time | PeoplePoetry None | possible |
The 8-hour broadcast passes all three tools for length. Instead, there are cases where capacity is blocked. Even for the same 8 hours, the file size varies greatly depending on the encoding settings, so it is safer to check the GB in the file properties and compare it to the tool upper limit before uploading.
Tip: Check three things before hitting the upload button: ① VOD length (hours: minutes), ② File size (GB), ③ Whether the Chzzk and SOOP replay address can be pasted as is. If the tool does not allow you to enter a link, you must download the file first, which increases the work time by one level.
Why does one month's credit disappear after uploading one broadcast?
If the charging unit is 'minutes of uploaded video', the broadcast length is the cost. 3 hours is 180 minutes, 6 hours is 360 minutes, and 8 hours is 480 minutes. Regardless of how many finished shorts you get, the original length is deducted, so the longer the shorts last, the bigger the loss.
| broadcast length | Amount of upload per time | 5 times a week, 20 times a month Total | 3 hours preparation |
|---|---|---|---|
| 3 hours | 180 minutes | 3,600 minutes | 1x |
| 6 hours | 360 minutes | 7,200 minutes | 2x |
| 8 hours | 480 minutes | 9,600 minutes | Approximately 2.7 times |
5 times a week, 8 hours per session, that's 9,600 minutes or 160 hours per month. Plans that offer minute credits rarely accept this volume. Usually, the remaining amount runs out around the second week. If you are someone who broadcasts long broadcasts every day, the billing plan based on the number of results rather than minutes is correct.
Opus Clip is divided into Free ($0), Starter ($15), Pro ($29), and Business (custom quote) (Opus Clip Plan). ClipSpray is based on pieces: Light $19.99 (50 items per month), Pro $59.99 (160 items per month), and Max $119.99 (450 items per month) (ClipSpray plan ). If you set a goal of 5 shorts per broadcast, 20 broadcasts per month will amount to 100, which is not enough for Light and fits the Pro section. Most free trials are based on short videos, so it is difficult to gauge performance with an 8-hour VOD.
What does AI look at to determine that it is an ‘explosion moment’?
The real reason why the results are different even if the same broadcast is broadcast is the selection signal. Tools that read only the screen and voice are based on sounds and facial expressions, and tools that view chat and Done together are based on viewer reactions. Tools that only view screen and audio structurally miss moments of quiet admiration from viewers.
| selection signal | Good catch scene | Missed Scenes |
|---|---|---|
| Audio volume peak | Screaming Moment | Quiet Cider Reaction |
| Facial expressions and speech speed | reaction big talk | Clutch, a game where you only move your hands without saying a word |
| Subtitles (STT) keywords | Event described in words | Game terms and nicknames with slurred pronunciation |
| chat surge | Where viewers actually reacted | Early morning section with few simultaneous connections |
| Star Balloon and Cheese Timestamp | The moment a story or event breaks out | Section of the game with almost no players |
Korean recognition accuracy also varies here. Streamer broadcasts are constantly filled with abbreviations, game terms, and viewer nicknames. If the subtitles are incorrect, the automatically generated title will also be incorrect. When checking subtitle accuracy, it is faster to count how many proper nouns survive rather than the entire sentence.
If you can't find a place that will accept the full 8 hours, put ClipSpray on the list. It scans up to 24 hours of replay from beginning to end, and shows the points where Chat and Done fell apart as candidate grounds. The signal used to select the candidate is summarized in Operation method.
Tip: When comparing tools, use one broadcast for which you already know the results. If you write down the time when chat rose the fastest that day and see whether each tool selected that section as a candidate, the signal difference will be immediately apparent.
Why are all the clips selected only at the beginning of the broadcast?
Automatic extraction of long video highlights AI usually assigns relative scores to the entire video. If the opening tension at the beginning or the first game is loud in both sound and movement, all scores in that section go up, and the calm scenes in the 6 to 8 hours of the second half are pushed below the cut line. In an 8-hour broadcast, this is where more than half of the candidates are crowded into the first two hours.
comparing candidates are concentrated in the first two hours of the broadcast in order of scores, and candidates remain in the second half of the broadcast in chronological order.
Processing time and inspection volume also increase at the same rate. 480 minutes is about 2.7 times the length of 180 minutes, so the time to wait for the results to come out and the time to open the candidates one by one is correspondingly longer. If you follow the flow from upload to download in order and set inspection points, this time will be reduced. The order in which 8 hours of video is actually processed is outlined step by step in Long Broadcast Editing.
1️⃣ Secure VOD file after the broadcast ends: Check the length and capacity first.
2️⃣ Wait for analysis after upload: The longer the original, the longer the wait, so overlap with other tasks.
3️⃣ Browse through the shortlist chronologically: Browse chronologically instead of sorting by score.
4️⃣ Check the second half section: If there are 0 candidates, cut only that section and repost it or check the quota options for each time zone.
5️⃣ Subtitle proofreading and title confirmation: After correcting typos in nicknames and game terms, decide on a title.
6️⃣ Render and Download: Export 9:16 vertical shorts and 16:9 horizontal clips together.
Tip: Vertical videos uploaded after October 15, 2024 and up to 3 minutes in length are classified as shorts, and the maximum resolution that can be uploaded is 1080p (YouTube Customer Center). If you set the render settings within this range, you can avoid deteriorating image quality due to re-encoding.
So what criteria should I use to choose for my broadcast?
If the broadcast is short, you can use anything. The problem starts as soon as you exceed 3 hours, and at this point, the items to check become clear. Automatic cut editing, automatic subtitles, 9:16 reframing, and title creation are all available with any tool, so they are not standards for comparison; only the input upper limit, charging unit, and selection signal remain.
- Edited version under 30 minutes: Decided on price and processing speed, nothing more.
- Game broadcasts of 2 hours or less: 16:9 horizontal clip quality and Korean subtitle accuracy are prioritized
- Live full video over 3 hours: Check three things: upper limit on input length, per-minute billing, and use of chat signal
- Marathon or combination of more than 6 hours: Check whether a timeline report is provided on the distribution of candidates by time zone and the basis for selection.
- Broadcast with frequent Chzzk and SOOP Done (Star Balloon and Cheese) events: Check whether Done timestamp is used as a signal
You can quickly get a sense of cost by looking at the outsourcing unit price side by side. Based on Kmong, short-form video production outsourcing costs a minimum of 20,000 won, an average of 130,000 won, and a maximum of 340,000 won (Kmong). If one were to hire one more editor, the minimum wage in 2026 would be 2,156,880 won per month (Ministry of Employment and Labor).
In summary, selecting AI for automatically extracting highlights from long videos is not a battle over the number of tools. It's a matter of passing three conditions that suit the length and personality of my broadcast. To actually check why a scene is selected as a candidate, the fastest way is to upload a broadcast you normally do and receive a report.
Frequently Asked Questions
Can I also upload an 8-hour broadcast replay?
In terms of length, Opus Clip (10 hours), Vizard (600 minutes), and ClipSpray (24 hours) are all available. However, there is a separate file size limit of 30GB for Opus Clip and 10GB for Vizard, so depending on the encoding settings, you may be blocked here. Check the GB in the file properties before uploading and check against the tool limit.
If I bill by the minute, how much credit do I need per month?
An 8-hour broadcast is calculated as 480 minutes per episode. 5 times a week, 20 times a month is 9,600 minutes, or 160 hours in terms of time, so minute-based credit plans usually run out of balance around the second week. For this volume, a rate based on the number of results is advantageous.
Why are all the selected clips concentrated only at the beginning of the broadcast?
This is because most tools assign relative scores to the entire video. If a section with loud sound and movement, such as the opening tension or the first game, dominates the score, the calm scenes in the second half of the game from 6 to 8 hours will be pushed below the cut line. This can be supplemented by checking the candidates in chronological order and cutting out only the latter section separately.
Why is it important to analyze chat and star balloon reactions?
Tools that only read the screen and audio are based on sound and facial expressions, so they structurally miss the moments when viewers quietly admire them. Using chat spikes or donae timestamps as signals can help you pinpoint where your viewers are actually reacting. However, early morning sections with few simultaneous connections or game sections with few players can be missed, so it is safer to mix signals.
How can I quickly check the accuracy of Korean subtitles?
It is quicker to count how many proper nouns survive than to look at the entire sentence. This is because abbreviations, game terms, and viewer nicknames appear constantly in streamer broadcasts, and if the subtitles are incorrect, even the automatically generated title will be incorrect. Select one broadcast whose results you already know as a reference sample and test it.
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