Checking a Compressed Video Before Sending It

I used to compress a clip, attach it to an email, and assume the export was fine. Then someone replied that the audio drifted halfway through. Now I spend a few minutes checking the file before I send it, and it saves me from sending a second version with an apology.

First I watch the whole clip, not just the opening. I scrub to a few moments I know well: someone speaking, a door closing, a quiet pause. If compression has blurred a face or turned a detailed background into blocks, I notice it there. I keep the playback window at normal size and also full screen for a minute, because a small window can hide artifacts.

Then I check audio sync. I look for a clear sound near the start, middle, and end — a hand clap, a spoken consonant, a tap on a table. I watch the mouth or the action and listen for the sound. If it feels late or early, I re-export with different settings rather than hoping the recipient won’t notice.

I also play the file on another device. A phone, a tablet, or a different computer is enough. This catches problems that my editing machine hides: a codec the other player does not like, a black frame at the start, or audio that only comes out of one channel. I don’t need a perfect test; I just need one playback that isn’t on the same setup.

File size is the last check, but not the only one. I look at the size in the file properties and compare it with what my email or upload form allows. If a plan or transfer service has a limit, I check its current terms instead of guessing. For example, if a form allows 20 MB and my clip is 24 MB, I know it needs another pass. I sometimes use MOV Compressor when I need to make that pass without changing the clip’s length.

Before sending, I rename the file with a short, clear name and note the version. Then I send it to myself first. It sounds fussy, but watching, listening, playing it elsewhere, and checking the size takes less time than fixing a bad send.

— Jessica Turner