Why can an audition tape fail as an email attachment even when the file looks small?

Email attachments are commonly encoded for transport. Base64 represents three bytes of original data as four encoded characters, so the message can be roughly one third larger than the file on disk. Turn on the email headroom option when the cap is a true attachment limit.

audition export planner

self tape file size calculator

Work out whether your audition self tape will fit the requested upload cap, what video bitrate to export, how much smaller your current file needs to be, and how long the upload may take.

Set the tape specs

Units and file limit

File unit display

Limit shortcut Use the casting notice when it gives a different number.

Requested limit ()

Limit applies to

Need true email attachment headroom Applies Base64/MIME headroom so the encoded email can stay under the limit.

Runtime and files

Minutes

Seconds

Separate files

Export settings

Planned video bitrate ()

Audio bitrate ()

Safety / encoding margin (%) Keeps room for export variation and container overhead.

Current exported size ()

Upload planning

Your upload speed () Use an upload speed test result, not download speed.

Export target

maximum video bitrate —

Enter a runtime

Estimated export size —

Effective budget —

Current export reduction —

Estimated upload time —

Approximate size per file —

Current export bitrate estimate —

The numbers update instantly from your inputs.

How to use this self tape calculator

Enter the file cap from the audition instructions. If there is no cap, use the smallest limit your agent, casting office, or email workflow requires.
Enter the finished runtime, including slate, scene cards, pauses you leave in, and any separate files you plan to submit.
Set the audio bitrate and your planned video export bitrate. The result shows whether that export fits.
If your current file is too large, compare its size with the calculated maximum video bitrate and reduction percentage.
Use the upload time estimate before a deadline so a slow connection does not surprise you.

Formula used

The core video size calculation is bitrate multiplied by duration, divided by 8 to convert bits to bytes:

file size = (video bitrate + audio bitrate) × seconds ÷ 8

The target bitrate works backward from your file cap. When the email headroom option is on, the usable file budget is reduced because Base64-style email encoding commonly expands binary attachments by a 4-to-3 relationship.

When this helps actors

Self tapes often fail at the least convenient point: after you have edited the take, renamed the file, and started uploading near the deadline. This tool is meant for that export moment. It does not judge performance quality; it helps you choose a bitrate that fits the actual delivery constraint.

If the casting notice says each scene should be uploaded separately, choose “each separate file.” If you are emailing one message with multiple attachments, choose “whole submission” and turn on email attachment headroom. If a platform or casting office gives a different limit, type it directly into the custom limit field.

Method notes: This calculator uses standard bitrate math, the selected decimal or binary file unit, and user-entered limits. Shortcut caps are included for convenience from public help pages: Google Gmail Help describes the attachment threshold; Actors Access support lists an Eco Cast per-file cap; Casting Networks support lists a profile video cap. Always follow the current casting instructions over any shortcut.

FAQ

How do you calculate a self tape video file size?

Use the combined bitrate of the video and audio tracks, multiply by the tape duration in seconds, and divide by 8 because file size is stored in bytes while bitrate is normally stated in bits per second. This calculator then adds your editable safety margin and displays the result in your selected unit.

How do I know what bitrate to export for an audition file limit?

Enter the requested cap, runtime, audio bitrate, and number of separate files. The calculator converts the file cap into a maximum total bitrate, subtracts the audio bitrate, and returns the maximum video bitrate. Export at or below that number if you want the tape to fit with the margin you selected.

Why can a video under the attachment limit still fail by email?

Email systems often encode binary attachments for transport. Base64 represents three bytes of original data as four encoded characters, so the email message can be roughly one third larger than the file shown on your computer. If the audition must be sent as a true attachment, turn on the email headroom option.

Should I split self tape scenes into separate files?

Follow the casting instructions first. Splitting can help only when the cap applies to each file or when the platform asks for separate scene uploads. If the cap applies to the whole email or the whole submission, splitting the tape does not increase the total data budget; it only divides the same budget into multiple parts.

What should I do if the calculated bitrate looks too low?

First remove unnecessary pre-roll, dead air, duplicate takes, or long title cards. Then try a shorter runtime or separate files if the instructions allow it. If the bitrate is still too low, consider lowering resolution or asking the casting contact whether a link is acceptable. Do not ignore a stated file cap.