Compress Drone Footage on a Mac Without Wrecking the Shot

DJI 4K file size is set by bitrate, and the drone records at a high one so the footage survives editing. The Mini 4 Pro publishes a maximum of 150 Mbps for both H.264 and H.265, per DJI’s spec page (read 11 October 2026). Divide by 8 for megabytes a second, multiply by 60 for a minute.

A 20-minute run of footage at 150 Mbps is about 22.5 GB. That is 3.3 to 4.3 times the bitrate YouTube recommends for 4K, which is why a clip that edits fine on your Mac can become a drone video too large to upload on a hotel connection. A delivery copy at the recommended bitrate is a fraction of the size.

What limits will I hit?

The hard caps are rarely the problem. The time to upload 20 GB, and a client who must download it, is. Compressing first fixes both.

Usually yes for storage and sharing links, no for anything a stranger must open on an old device. H.265 (HEVC) compresses better than H.264, but it plays on fewer players, and its saving depends on how busy the picture is.

Apple describes the split plainly: High Efficiency records HEVC, while Most Compatible records H.264 and is described as more broadly compatible with other devices and operating systems. DJI’s Mini 4 Pro writes either inside an MP4, and its 10-bit HLG and D-Log M modes are H.265 only, as is 4K at 100 fps.

On our two generated test clips at the same settings, H.265 saved 3% on a calm pan and 30% on a busy one at CRF 28, per H.265 vs H.264. Foliage, water and waves look like the busy clip to an encoder, so H.265 drone footage tends to repay the switch more than a sky shot does, though we did not test drone files. The 4K compression guide covers the trade in more detail.

Start with H.265 at the High label, which is CRF 24, and adjust after you look at one clip. Smol offers H.265 (the default) or H.264, MP4, MOV, WebM or MKV output, quality labels (High is CRF 24, Web is CRF 28) or an exact CRF from 0 to 63, nine speed presets, a resolution you can keep or reduce, and an option to remove audio.

Smol sets quality and resolution, not output bytes, and video has no size target. After a run check the size of each result and rerun any file that misses at a higher CRF or lower resolution. A lower CRF number means higher quality and a bigger file.

For scale, twelve generated 1080p clips went from 135,034,271 to 14,005,491 bytes at H.265, CRF 28, an 89.6% reduction, measured on an M2 Pro on 27 September 2026 (see batch compressing videos). Those were five-second test clips, not drone files, so judge yours on a short sample first.

Copy the card to your Mac first, then compress the copies. It takes five steps.

1. 1

   Copy the card to a folder on your Mac

   Work from the copy. Smol writes a new file with a _compressed suffix and does not overwrite the original by default.

2. 2

   Drag the clips or the whole folder into Smol

   Mixed batches work, so stills and clips from the same flight can go in together.

3. 3

   Pick MP4 and a codec

   H.265 for a client link or archive. H.264 for anyone whose player is unknown.

4. 4

   Set quality and resolution

   Use High for review copies and Web for quick shares, or type an exact CRF. Reduce the resolution if 4K is not required.

5. 5

   Run it, then open the smallest and largest result

   Play a few seconds of each. If a file is still too large for its destination, raise the CRF or lower the resolution and run it again.

Send a link, not an attachment. Gmail stops at 25 MB and converts larger attachments to a Drive link anyway, so upload a compressed MP4 to shared storage and email the link.

• Put a High-quality H.265 or H.264 review copy in Drive, Dropbox or a similar folder. Drive accepts single files up to 5 TB, so the cap will not stop you.
• Ask which player the client uses. If the answer is unknown, send H.264 MP4, the format Apple describes as more broadly compatible.
• Keep the full-resolution file for the final delivery and send the smaller one for approval.
• If it must be an attachment, plan for roughly 15 MB, because encoding adds overhead. That is about 1,904 kbps for one minute, per compressing video for email, so cut the clip short.

Real estate and property work often ships drone clips with photos and PDFs; see real estate listing photos for that packet.

Here is how the common options compare, with free and built-in tools first.

If you already edit in Resolve, export your delivery from there. For a card of raw clips that just needs shrinking, a lighter tool saves time. The video compression comparison tests four methods.

You are still editing. Compress after the cut. Editing from a re-encoded file adds a generation of loss you do not need.

You must keep 10-bit log files exact. Smol makes no promise to preserve bit depth or a log profile, so archive D-Log M originals untouched.

You need GPS removed from video. Smol’s metadata operation covers images and PDFs, so it is not a video location scrubber.

You are not on a Mac. Smol runs on macOS only. Smol is also not the fastest encoder; a long card takes a while.

You compress once a month. QuickTime Player or HandBrake costs nothing and is enough.