GStreamer plugin SEGVs running out of VRAM

[asajeffrey]

Running the gstreamer plugin at 1080p causes a huge spike in VRAM usage, which causes a SEGV.

In LLDB:

* thread #59, queue = 'org.freedesktop.gstreamer.glwindow', stop reason = EXC_BAD_ACCESS (code=EXC_I386_GPFLT)
    frame #0: 0x00007fff47740072 libGPUSupportMercury.dylib`gldUpdateDrawFramebuffer + 108
libGPUSupportMercury.dylib`gldUpdateDrawFramebuffer:
->  0x7fff47740072 <+108>: callq  *0x160(%rax)
    0x7fff47740078 <+114>: movq   %r15, 0x30(%rbx)
    0x7fff4774007c <+118>: andl   $0x43c0478, %r14d         ; imm = 0x43C0478 
    0x7fff47740083 <+125>: orl    0x940(%rbx), %r14d
Target 0: (gst-launch-1.0) stopped.
(lldb) bt
* thread #59, queue = 'org.freedesktop.gstreamer.glwindow', stop reason = EXC_BAD_ACCESS (code=EXC_I386_GPFLT)
  * frame #0: 0x00007fff47740072 libGPUSupportMercury.dylib`gldUpdateDrawFramebuffer + 108
    frame #1: 0x00007fff364332da GLEngine`gleUpdateDrawFramebufferState + 602
    frame #2: 0x00007fff36351dd4 GLEngine`glClear_Exec + 205
    frame #3: 0x00000001100ce11e libgstservoplugin.dylib`std::thread::local::LocalKey$LT$T$GT$::with::hd2cc965df11a99b4 + 1998
    frame #4: 0x0000000110118896 libgstservoplugin.dylib`gstservoplugin::servowebsrc::fill_on_gl_thread::h1e8461bbb552fa65 + 214
    frame #5: 0x000000010045775f libgstgl-1.0.0.dylib`_run_message_sync + 24
    frame #6: 0x000000010046256d libgstgl-1.0.0.dylib`__gst_gl_window_cocoa_send_message_async_block_invoke + 39
    frame #7: 0x00007fff585e55f8 libdispatch.dylib`_dispatch_call_block_and_release + 12
    frame #8: 0x00007fff585e663d libdispatch.dylib`_dispatch_client_callout + 8
    frame #9: 0x00007fff585ec8e0 libdispatch.dylib`_dispatch_lane_serial_drain + 602
    frame #10: 0x00007fff585ed396 libdispatch.dylib`_dispatch_lane_invoke + 385
    frame #11: 0x00007fff585f56ed libdispatch.dylib`_dispatch_workloop_worker_thread + 598
    frame #12: 0x00007fff58826611 libsystem_pthread.dylib`_pthread_wqthread + 421
    frame #13: 0x00007fff588263fd libsystem_pthread.dylib`start_wqthread + 13