Tubelexity creator guide
YouTube video format guide: codecs, containers and upload checks
A video file combines a container, video stream, optional audio stream and metadata. Checking those properties before uploading can reveal an unusual codec, low resolution or rotated metadata, but no third-party checker can guarantee YouTube acceptance.
Check a local video formatStep-by-step workflow
- 01Inspect the container and video codec.
- 02Confirm the decoded dimensions and orientation.
- 03Check whether audio is present and intentional.
- 04Review bitrate and low-resolution warnings.
- 05Re-encode only when the visible checks identify a practical reason.
Container and codec are different
MP4 is a container; H.264 is a video codec that can be stored inside it. MP4 with H.264 and AAC is a common combination, while WebM often contains VP9 and Opus.
- The filename extension does not prove which codec is inside.
- A compatible container can still contain an unusual stream.
- Missing audio is acceptable when it is intentional.
Resolution, bitrate and orientation
Resolution describes frame dimensions. Bitrate describes encoded data per second and must be interpreted alongside frame size and motion. Phone video can rely on rotation metadata, so preview the processed upload rather than trusting dimensions alone.
What a local checker cannot prove
Browser metadata APIs do not expose every stream property, and YouTube can change its ingestion rules. Treat Cannot determine as honest uncertainty rather than a failure.
Frequently asked questions
Is MP4 always compatible?
No. The codecs and stream properties inside the MP4 also matter.
Can a silent video be uploaded?
Often yes, but confirm that the missing audio is intentional.
Can this guide guarantee acceptance?
No. YouTube makes the final ingestion decision.