大程视频百宝箱 - ffmpeg webCLI

Input Video

Click to choose or drag & drop local file

MP4, WebM, MOV, AVI, MKV, GIF…

0 files queued

Trim applied to all operations Disabled (batch mode)

Drag the handles to set start and end. Leave untouched to keep the full video.

Start

0:00.0

End

0:00.0

0:00 Full duration --:--

Operations

Convert to format

Use the Output Format selector below to choose format.

Resize & Compress

Width (px)

Height (px)

Quality (CRF)

28 (18=best · 28=default · 51=worst)

Preset

Output format

Dimensions are filled from the source video. Clear a field or set to -1 to preserve aspect ratio. Lower CRF = higher quality.

Extract audio track

Audio Format

Remove audio track

Output will be the same video with the audio stream stripped.

Animated GIF

FPS

Width (px)

Height is calculated automatically to preserve aspect ratio.

Playback speed

Multiplier

Rotate / Flip

Transform

Crop

Load a video to crop.

Load a video to preview the crop area.

Drag the box to move it. Drag the handles to resize.

Extract Thumbnail

Timestamp (seconds)

Format

Extracts a single frame at the given timestamp as an image file.

Reverse

Plays video and audio backwards. The whole clip is buffered in memory - keep clips under ~2 minutes for best results.

Fade In / Out

Fade in (sec)

Fade out (sec)

Set either value to 0 to skip that direction. Applied after trimming.

Adjust

Brightness

Contrast

Saturation

Grayscale

Strip Metadata

Removes all embedded metadata (GPS, camera info, creation date, etc.) from the output file. Video and audio are re-encoded.

Embed Subtitles

Subtitle file (SRT, VTT, or ASS)

No file chosen

Output format

Subtitle embedding method Stream embed (soft subtitles) - fast, selectable by user Hard-burn - slower, baked into frames, always visible

Soft subtitles recommended for VLC & browsers. Hard-burn for social media & guaranteed visibility.

Caption font size (hard-burn only)

Auto-Caption (Whisper)

Whisper Model

Output Format

Hard-burn subtitles into video (re-encodes, slower)

Unchecked: Fast, embeds as soft subtitle stream. Checked: Slower, burns subtitles directly into frames.

Caption font size (hard-burn only)

Base model is recommended for most videos. Downloads and caches on first use.

Transcript (Editable)

Process is 100% local: audio is extracted, transcribed on-device with Whisper via Transformers.js, and embedded as soft subtitles. Zero data leaves your browser.

Volume

Multiplier - 1.00×

1.0 = original · >1 = boost · <1 = reduce · 0 = silence. Audio is re-encoded; video is stream-copied.

Loop / Repeat

Total plays

Streams are copied without re-encoding. The clip plays N times back-to-back. Trim is ignored for this operation.

Logo / Image Overlay

Image file (PNG with transparency recommended)

No file chosen

Position

Width (% of video)

PNG with alpha gives cleanest results. Video is re-encoded to preserve overlay.

Mix Audio (Background Music)

Music / audio file

No file chosen

Original audio - 1.00

Music volume - 0.30

Music loops automatically if it is shorter than the video. Video is stream-copied.

Concatenate (Join Clips)

Second clip (appended after the loaded file)

No file chosen

Uses the concat filter - different resolutions and codecs are handled by re-encoding to H.264/AAC. Trim applies to the first clip only.

Side by Side

Second video

No file chosen

Layout

Common dimension (px)

Audio

Both clips are scaled to the same height (horizontal) or width (vertical) then stacked. Re-encodes to H.264/AAC. Trim is ignored.

Picture in Picture

Overlay video

No file chosen

Position

Width (% of main video)

Overlay video loops if shorter than the main clip. Audio from the main clip is preserved. Trim applies to the main clip.

Media Info

Load a video file to see its properties.

Click Process Video to run a deep scan and log full codec & stream details below.

Raw FFmpeg

► Example Commands

No file chosen

Arguments -- inserted after -i input, before the output filename

Output extension

Bypass trim

Full command preview

Args are split on whitespace. Wrap values containing spaces in double quotes, e.g. -vf "scale=1280:-2,hflip"

Pad to Aspect Ratio

Target Ratio

Pad Color

Video is scaled down to fit; empty space is filled with the chosen color. Re-encodes to H.264.

Normalize Audio (EBU R128)

Target Loudness

Uses the loudnorm filter. Video stream is copied without re-encoding.

Denoise (hqdn3d)

Strength

Applies spatial + temporal noise reduction via hqdn3d. Higher strength = smoother but softer image.

Boomerang

Plays the clip forward then immediately in reverse — classic boomerang loop. Trim is respected. Audio is removed from the output.

Sharpen / Blur

Effect

Intensity

Sharpen uses unsharp; blur uses boxblur. Audio is copied.

Operation Stack

No operations yet — configure an op above and click “Add to Stack”.

Output format

Composed command preview

(stack is empty)

Operations run in the listed order as one filter chain with a single re-encode. Trim (if set) is applied first.

Output Format

Estimated output size —

Processing…0%

Output ready:

Output

Process a video to see the result here

Batch Outputs (0)