Title: NoSuchElementException in ExternalTextureManager during rapid seeking (Race Condition)

[Adelyesa]

Version

Media3 main branch(any version with scrubbingMode)

More version details

Description: When using any Player with setVideoEffects (GL processing) or setVideoSurface() (custom surface) and scrubbing rapidly (calling seekTo frequently), the app crashes with java.util.NoSuchElementException inside ExternalTextureManager.

It appears to be a race condition:

Main Thread calls seekTo, which flushes the internal video buffer.

GL Thread (simultaneously) attempts to process a frame in ExternalTextureManager.

ExternalTextureManager calls pendingFrames.element() or remove() on an empty queue (because it was just flushed) instead of using peek() or checking isEmpty().

Stack Trace:

Caused by: java.util.NoSuchElementException
at java.util.AbstractQueue.element(AbstractQueue.java:136)
at androidx.media3.effect.ExternalTextureManager.maybeQueueFrameToExternalShaderProgram(ExternalTextureManager.java:410)

Request: Please change element()/remove() calls to safe peek()/poll() checks in ExternalTextureManager to handle cases where the queue is flushed concurrently by a seek operation.

Devices that reproduce the issue

Any android device

Devices that do not reproduce the issue

None

Reproducible in the demo app?

Unknown

Reproduction steps

-Load a video and set the surface to a custom BaseGlShaderProgram() class that draws frames
-SetScrubbingModeEnabled(true)
-try seeking every 50-200ms(reasonable)

Expected result

Successful seeks just like without scrubbing mode enabled

Actual result

Player gets stuck and that specific error gets thrown

Media

Not Applicable

Bug Report

• You will email the zip file produced by adb bugreport to android-media-github@google.com after filing this issue.