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Old MOV files from the 2000s that a new Mac will not open

· 6 min read

Old MOV files that played for years and now will not open on a Mac are almost never damaged. They were compressed with video formats from the QuickTime 7 era, such as Sorenson Video, Cinepak or Indeo, and macOS stopped including the parts that decode them when it dropped 32-bit software in macOS Catalina. The picture is still in the file. You need something that can still read the old format to make a modern copy, and then you keep both.

Why a file that played for years suddenly will not

A MOV file is a container. Inside it, the video and audio are compressed with a codec, and the Mac needs a decoder for that codec to show you anything. For a long time QuickTime shipped with decoders for dozens of formats that were popular on CD-ROMs, early websites, digital cameras and home movie exports in the late 1990s and 2000s.

Those decoders were 32-bit components. When macOS Catalina removed support for 32-bit software, they went with it, and Apple’s media frameworks were rebuilt around a much shorter list of modern codecs. Mojave, the release before, had started warning about media that would not be compatible in future. On any Mac running Catalina or later, including every Apple silicon Mac, those files simply stop opening.

What you see is one of these:

  • QuickTime Player says the file is not compatible, or refuses to open it.
  • Finder shows a generic icon with no thumbnail.
  • The picture plays but the sound is missing, or the other way round, because only one of the two tracks uses a retired format.

None of these means the file is broken. QuickTime says the file isn’t compatible covers the error message in general; this post is about the old-archive version of it.

Which files are affected

The retired formats were mostly used before the mid-2000s, when H.264 took over. The names that come up most often:

  • Sorenson Video and Sorenson Video 3, very common in movie trailers and web video of the time.
  • Cinepak, used on CD-ROMs and in early multimedia.
  • Indeo, found in old game and encyclopedia discs and some early camera software.
  • A handful of older audio formats that often traveled alongside them.

Formats that still play on a current Mac include H.264, HEVC, ProRes, DV and Motion JPEG, so many old camcorder captures and digital camera clips are fine. If only some of your old files fail, that is expected: they were made with different tools.

How to check what is inside

Start with Finder. Select the file, choose File, Get Info, and open More Info. If the Codecs line lists something recognizable, that is your answer. For retired formats it is often blank, because the Mac no longer knows the name.

A rough check in Terminal looks for the four-letter codes old QuickTime files use to label their tracks. Paste the line below, replace old-movie.mov with your file (delete the name and drag the file onto the Terminal window to insert its full path), and press Return:

LC_ALL=C grep -aoE 'SVQ1|SVQ3|cvid|IV32|IV41|IV50|QDM2|QDMC' old-movie.mov | sort | uniq -c

SVQ1 and SVQ3 are Sorenson Video, cvid is Cinepak, IV32, IV41 and IV50 are versions of Indeo, and QDM2 or QDMC are an old audio format. A match is a strong hint rather than proof, but on a file that will not open, it usually settles the question.

Option 1: an older Mac, if you still have one

If there is a Mac in a cupboard running macOS Mojave or earlier, it probably still has the old decoders. QuickTime Player there can usually open these files and export a modern copy with File, Export As. Choose a resolution at or near the original, not larger. The exported file uses a current codec and will open on any Mac.

This works well for a few files. For a whole folder, it gets slow, and many people no longer have a Mac that old.

Option 2: convert them with Manatee

Manatee bundles its own conversion engine, ffmpeg, rather than relying on the decoders macOS provides, and ffmpeg includes decoders for many of these older formats. It is included in the roughly 100 MB download, so nothing is fetched later and everything runs on your Mac.

  1. Open Manatee and choose Convert, or drag the files onto its menu bar icon.
  2. Drop in the old MOV files. A whole folder’s worth is fine; each one becomes a job in the list with its own progress.
  3. Choose MP4 for the widest compatibility, or MOV if you plan to keep editing in Apple’s apps.

Manatee writes each converted copy alongside the original and never modifies the original. Because old archives vary so much, try a few representative files during the free 24 hours, which include every feature, and check the results before you convert everything. If a file still will not convert, it may use an unusual format or be genuinely damaged; how to check whether a video file is corrupted helps you tell which. After the trial, Manatee is $9 once.

For converting a large archive in one go, how to convert a batch of files at once has tips on keeping the results organized.

What to expect from the converted copies

A conversion reads the old video and writes it again in a modern format. It cannot add detail that was never there. Many of these files were made at 320 by 240 or similar, at low bitrates, and they will look exactly as soft as they always did, just in a format your Mac can play.

A few things are worth knowing:

  • The new file may be bigger. Modern codecs at sensible quality settings often use more space than a heavily compressed file from 2002. Why a video got bigger after you converted it explains why and when it matters.
  • Do not upscale. Converting at the original size gives the most faithful result. Making a tiny video larger only makes the blocks bigger.
  • Keep the originals. Store the old files next to the converted copies. They are the source, and future tools may read them better.
  • Check the sound. If the audio used a retired format too, play a converted copy through to confirm the sound came across.

Questions

Are my old files corrupted? Almost certainly not, if they played in the past and nothing has happened to them since. The Mac lost the ability to decode the format; the data is where it was.

Will Photos or iMovie open them? Not reliably on a current Mac. Both use the same system frameworks as QuickTime Player, so a file QuickTime cannot decode will either refuse to import or sit in the library without playing. Convert first, then import the new copy.

Should I convert to MP4 or MOV? For keeping and sharing, MP4. It opens on Macs, PCs, phones and TVs. MOV is a reasonable choice if the clips are headed for an Apple editing app, but the video inside can be the same either way.