Media tools
Sume media tools by API: trim, filter, captions, frames, inspect, speech-to-text, upscaling, background removal, transitions, and Timeline assembly.
Start with Video editing API limits: Sume media tool caps in one table
What size is 16:9 in pixels? Common 16:9 and 9:16 sizes
16:9 is a shape, not one size: 1280 × 720, 1920 × 1080, 2560 × 1440 and 3840 × 2160 are all 16:9. How to work out any size, and how to make one.
Twitter video ad specs: X Ads sizes, length, and file rules
X recommends video ads of 15 seconds or less, up to 1 GB (ideally under 30 MB), H.264 at 29.97 or 30 fps, in six sizes from 9:16 to 1.91:1.
CTV ad specs: video rules from five streaming TV sellers
CTV sellers ask for 16:9 video, H.264 or ProRes, and two-channel audio, but each sets its own lengths and a bitrate floor from 5 to 15 Mbps.
Roku ad specs: video and audio rules for Roku Ads Manager
Roku ads must be 16:9, 6–92 seconds, .mov or .mp4 up to 1 GB, 23.98, 25 or 29.97 fps, 6 Mbps or more, with 48 kHz 2-channel stereo audio.
Hulu ad specs: Disney's video rules for Hulu and Disney+
Hulu and Disney+ ads must be 16:9 (1920×1080 preferred), H.264 or ProRes at 23.98–30 fps, with one two-channel audio track of 128 kbps or more.
Amazon Sponsored Display video specs: display ads with video
Amazon display ads with video, formerly Sponsored Display, take 16:9 at 1920×1080 or more, 6–45 seconds, up to 500 MB, and autoplay muted.
Amazon Sponsored Products video: specs and guidelines
Sponsored Products video takes 1–5 silent feature videos per product: 7 seconds or longer, 16:9 (1920×1080 recommended), MP4 or MOV up to 500 MB.
YouTube Masthead specs: video size, autoplay, and captions
A YouTube Masthead plays a Public or Unlisted YouTube video, ideally 16:9 at 1920×1080 or higher, and autoplays muted for up to 30 s on desktop.
Social media video sizes: 8 platforms in one table
Vertical 9:16 is the video shape most platforms list. The sizes TikTok, Instagram, Facebook, YouTube, Snapchat, X, LinkedIn, and Pinterest give.
YouTube video size: 16:9 resolutions and upload settings
The standard YouTube video size is 16:9, and 1080p is 1920×1080. Every 16:9 size and bitrate YouTube recommends, and its 256 GB upload limit.
LinkedIn video size: dimensions, length, and file limits
A video in a LinkedIn post can be 256×144 to 4096×2304 pixels, 1:2.4 to 2.4:1, 75 KB to 5 GB and up to 15 minutes long. How to render one to fit.
Google Ads image sizes: 1200×628, 1200×1200, and 960×1200
Google's most common ad image sizes are 1200×628 (1.91:1) and 1200×1200 (1:1), plus 960×1200 (4:5) for Performance Max, as JPG or PNG up to 5,120 KB.
LinkedIn ad image size: 1200×628, 1:1, and 4:5 specs
LinkedIn recommends 1200×628 for single image ads, 1200×1200 for square and 720×900 for 4:5, as JPG, PNG or GIF up to 5 MB. Carousel cards: 1080×1080.
Etsy banner size: big and mini shop banner dimensions
Etsy recommends 1600×400 px for a big shop banner (1200×300 minimum) and 1600×213 for a mini banner. Logo sizes, file types, and a 4:1 AI banner.
Google Play feature graphic size: 1024×500 requirements
A Google Play feature graphic must be 1024×500 px, a JPEG or a 24-bit PNG with no alpha, and you need one to publish. The rules, and making the art.
Steam capsule sizes: header, small, main, and vertical
Steam's capsules are 920×430 (header), 462×174 (small), 1232×706 (main) and 748×896 (vertical). What each may show, and how to make the art at size.
YouTube watermark size: 150×150 minimum, under 1 MB
YouTube's video watermark must be a square image of at least 150×150 pixels and under 1 MB. When it shows, where it's hidden, and how to make one.
Transcribe long audio files: split into 10-minute parts
To transcribe long audio by API, split it into parts of up to 10 minutes, transcribe each part, then add each part's start time to its timestamps.
Transcribe video to text with an API: send the audio track
Transcribe video to text by API: send the audio track to speech-to-text. On Sume, inspect a Sume-hosted clip or send your own file's audio to STT 1.0.
Detect language from audio with a speech-to-text API
Detect the language spoken in an audio file: run speech-to-text with no language hint, then read the detected code and confidence from the result.
Korean speech to text API: transcribe Korean audio
Transcribe Korean speech to text by API: send the audio URL with language_code ko, or let it auto-detect, and get the transcript with word timings.
How to calculate speech rate in words per minute
Speech rate is words spoken divided by speaking time in minutes. Word timestamps from speech-to-text measure both, per recording or per sentence.
Translate audio to English: transcribe, translate, speak
Translate audio to English in three steps: transcribe the recording with language detection, translate the text, then voice it with TTS if needed.
Lip sync AI for long videos: past the 5-minute clip limit
To lip sync a long video with AI, split the audio, sync each part to the same face, and join the clips. One Sume job takes up to 300 s of audio.
How to burn an SRT file into a video
Burning an SRT file draws its lines into the picture. Sume's captions API takes no .srt file, so turn each block into a cue and send the cues instead.
How to generate an SRT file from a video
To generate an SRT file from a video, transcribe it with timestamps and write each timed sentence as a numbered block. Sume's STT returns timed JSON.
Hard subtitles vs soft subtitles: what's the difference?
Hard subtitles are burned into the picture and always show; soft subtitles are a separate track viewers can turn off. When to use each, and how.
How to add text over a video: timed titles and labels
Add text over a video by burning timed cues: send the clip to Sume's /v1/video-captions with text, start, and end, and set how high the line sits.
How to add subtitles to a video from a transcript
Have the words but no timings? Send the transcript as script_text with the video to Sume's captions API, which times it to the speech and burns it.
How to add bilingual subtitles to a video
Burn two languages onto one video with Sume: put both lines in each cue of one caption job, or run two jobs, each language at its own height.
How to add a logo or watermark to a video
Add a logo or watermark to a video by laying the image over every frame. Sume's Timeline compose does it for Sume-hosted files in one MP4.
How to add an image to a video at a specific time
Show a picture only between two timestamps: compose it over that stretch of the clip, or cut to it as a still, then rebuild the video in one render.
How to convert MP3 to MP4 with an image
Turn an MP3 into an MP4 with one picture: a Timeline 1.0 render holds the image for the whole track, up to 30 minutes, at the frame size you set.
How to freeze frame a video: hold the last or any frame
Freeze a video's last frame with one tpad filter call, or hold any frame mid-clip as a still between two parts of the clip in a Timeline render.
How to increase video length by looping a short clip
Loop a short clip until it matches a song or voiceover: put it in one Timeline 1.0 slot as long as the audio and set render.pad_mode to loop.
How to remove silence from a video automatically
Find every pause from a transcript's word timings, keep the speech with a small margin, and render the kept ranges back to back in one Timeline job.
How to fix audio delay in a video by shifting the sound
Fix a video whose sound runs late or early: detach the audio and re-render the clip with the offset set as audio.source_in or the slot's source_in.
How to rotate a video 90 degrees and save it
Rotate a video 90 degrees with ffmpeg's transpose filter: clock turns it clockwise, cclock counterclockwise. Sume's video filter saves a new MP4.
How to make a video square: crop it or fit it in 1:1
Make a video square by cropping a centered 1:1 window, or fit the whole frame in a square with black bars. Both are one FFmpeg filter job on Sume.
How to make a vertical video horizontal (9:16 to 16:9)
To make a vertical video horizontal, put the 9:16 clip in a 16:9 frame and fill the sides with a blurred copy or black bars. How to do it with Sume.
How to remove black bars from a video by cropping
Black bars baked into a video only go away with a crop. Measure them on a full-size still, then crop them off with FFmpeg's crop filter on Sume.
How to make a video black and white (or keep one color)
Make a video black and white by setting its saturation to zero with FFmpeg's hue or eq filter, or keep one color with colorhold. How to do it on Sume.
How to brighten a dark video: exposure, gamma, or levels
Brighten a dark video with FFmpeg's exposure, eq gamma, or colorlevels filter, run as one Sume video filter job. To darken instead, use the dim op.
How to color correct a video: fix a color cast and warmth
Color correct a video with FFmpeg filters on Sume: colorbalance removes a yellow or green cast, colortemperature sets warmth, and eq sets saturation.
How to blur part of a video or black it out
Blur part of a video by cropping the area, blurring it, and overlaying it back in one FFmpeg filtergraph on Sume, or cover it with a solid drawbox.
How to merge two videos of different resolutions
Merge two videos of different resolutions by scaling both into one frame: crop, pad, blur, or stretch each clip, then join them with their sound.
How to add a voiceover to a video and keep its sound
Add a voiceover to a video by mixing narration over its own sound: speak the script with TTS, then render the clip with both tracks in one MP4.
MP4 video has no sound? Find where the audio went
An MP4 with no sound has no audio track, a silent one, or one your player can't decode. Check with a free probe, then fix the step that lost it.