Why does a downloaded video have sound but no picture on my Chromebook?
Quick answer
Sound without a picture can happen if the video format or codec is not supported by the player, but the symptom alone does not prove the cause. Google lists WebM with VP8 or VP9 video, and MP4 or MOV with H.264 video, among Chromebook-supported combinations. Check the file details and download, then try a compatible playback option or request another copy. [S1]
The question, the details, the next step.
My downloaded video plays sound, but the picture is black or missing. What should I check first?
Treat it as a clue, not a diagnosis. The video’s format or video codec may not work with the player you are using, even though its audio plays. Google’s Chromebook guide lists WebM with VP8 or VP9 video, and MP4 or MOV with H.264 video as supported combinations. It also says AVI and MPEG4 are no longer supported on Chromebooks. [S1]
The guide does not establish why a particular file has sound but no picture, and it does not address incomplete downloads. Note the filename ending, where the file came from, and whether it behaves the same way in another playback option. Those details can help you narrow down what to check without assuming a cause.
The filename ends in .mp4. Doesn't that mean it should work? And how can I tell whether the download is incomplete?
The .mp4 ending alone does not tell you which video codec the file uses. Google lists MP4 with H.264 video as a supported combination, but that does not confirm that a particular MP4 contains H.264 video. [S1] If file details show the video codec, check that as well as the container. If you cannot see those details, avoid guessing from the extension.
For the download, compare its displayed size with an expected size if the sender or download page provides one. If the download was interrupted or the sizes clearly differ, get a fresh copy from the original source and see whether it behaves differently. This is a practical check, not proof that an incomplete download caused the problem; the supplied guide does not discuss download completeness. If possible, also compare playback with the device or service the video came from.
Can you give me a simple way to narrow it down without changing lots of settings?
Yes. Change one thing at a time and write down the result. For example:
- Record the filename and extension, such as
clip.mp4. - Note the player and symptom: “sound plays; picture does not.”
- Check the video codec in the file details, if available. MP4 with H.264 is a combination listed in Google’s guide; the extension alone does not establish the codec. [S1]
- If an expected file size is available, compare it with the downloaded file. If in doubt, try a fresh copy from the original source.
- Try a playback option that supports the identified video codec, or ask the source for another copy.
If you see an “Unknown file type” message, Google says that means the file type is not working on the Chromebook at that time. [S1] The message does not identify every possible reason the picture is missing.
What should I ask the person who supplied the video for?
Keep the request specific and neutral. You could send:
“Hi, I downloaded [filename] to my Chromebook. It plays audio, but I do not see the picture. Could you tell me which video codec it uses, or send another copy in a format intended for Chromebook playback? If possible, please also confirm the expected file size so I can compare it with my download.”
Google lists WebM with VP8 or VP9 video, and MP4 or MOV with H.264 video among supported combinations. [S1] That does not guarantee a particular file will play: the guide does not diagnose your file, verify its download, or specify which playback option is best for it.
A practical checklist
Record the filename extension and the player used.
Check the video codec in file details if available; do not infer it from the extension alone.
Compare the downloaded file size with an expected size, if one is provided.
Try a fresh copy from the original source and note whether the result changes.
Ask for a copy using a listed Chromebook-supported format and codec combination. [S1]
A few more useful answers
Does sound without a picture prove the video codec is unsupported?
No. Codec incompatibility is one possibility, but the symptom alone does not prove it. The supplied Google guide lists supported combinations but does not diagnose this particular problem. [S1]
Is every MP4 video compatible with a Chromebook?
The file extension alone is not enough to tell. Google lists MP4 with H.264 video as a supported combination, but that does not establish the codec inside a particular MP4 file. [S1]
Does a fresh or larger download guarantee the picture will work?
No. Comparing sizes or trying a fresh copy can help investigate an incomplete download, but the supplied guide does not address incomplete files or guarantee that a new copy will play.
Sources
References used for this guide.
- [S1] File types and external devices that work on Chromebooks support.google.com · Checked