Bug 308588 – http/wpt/mediarecorder/MediaRecorder-matroska-AV-audio-video-dataavailable.html is a permanent failure on Mac Pro intel

• Component: Media
• Status: RESOLVED DUPLICATE

[Jean-Yves Avenard [:jya]]

```
--- /Volumes/Data/worker/macOS-Sequoia-Release-WK2-Intel-Tests-EWS/build/layout-test-results/http/wpt/mediarecorder/MediaRecorder-matroska-AV-audio-video-dataavailable-expected.txt
+++ /Volumes/Data/worker/macOS-Sequoia-Release-WK2-Intel-Tests-EWS/build/layout-test-results/http/wpt/mediarecorder/MediaRecorder-matroska-AV-audio-video-dataavailable-actual.txt
@@ -1,5 +1,7 @@
 
 
 
-PASS MediaRecorder can successfully record the video for an audio-video stream into a matroska file
+Harness Error (FAIL), message = Error: assert_unreached: recording didn't finish on time Reached unreachable code
 
+FAIL MediaRecorder can successfully record the video for an audio-video stream into a matroska file assert_approx_equals: Red channel of the pixel at (20, 20) expected 20 +/- 50 but got 229
+
```

for some reasons on MacPro and iMac Pro, encoding h264 fails (but works with vp9 or vp8)

[Radar WebKit Bug Importer]

<rdar://problem/171114202>

[Jean-Yves Avenard [:jya]]

Adding logging to determine what going on, you can see that the VideoEncoder::encode promise is resolved when using an H264 encoder well before a frame has been returned.

```
22:05:19.880 68157   Queuing 2 frames for encoding, total frames to be enqueued:2
22:05:19.880 68157   Encoding: frame:0.000000 needKeyframe:1
22:05:19.880 68157   Encoding: frame:0.000001 needKeyframe:0
22:05:19.880 68157   Queuing 1 frames for encoding, total frames to be enqueued:1
22:05:19.880 68157   Encoding: frame:0.058049 needKeyframe:0
22:05:19.880 68157   Queuing 1 frames for encoding, total frames to be enqueued:1
22:05:19.880 68157   Encoding: frame:0.066757 needKeyframe:0
22:05:19.880 68157   Queuing 1 frames for encoding, total frames to be enqueued:1
22:05:19.880 68157   Encoding: frame:0.069659 needKeyframe:0
22:05:19.880 68157   Queuing 1 frames for encoding, total frames to be enqueued:1
22:05:19.880 68157   Encoding: frame:0.087074 needKeyframe:0
22:05:19.880 68157   Queuing 1 frames for encoding, total frames to be enqueued:1
22:05:19.880 68157   Encoding: frame:0.101587 needKeyframe:0
22:05:19.880 68157   Queuing 1 frames for encoding, total frames to be enqueued:1
22:05:19.880 68157   Encoding: frame:0.121904 needKeyframe:0
22:05:19.881 68157   MediaRecorderPrivateEncoder::FlushPendingData upTo:0.165442
22:05:19.881 68157   Queuing 1 frames for encoding, total frames to be enqueued:1
22:05:19.881 68157   Encoding: frame:0.136417 needKeyframe:0
22:05:19.881 68157   Queuing 1 frames for encoding, total frames to be enqueued:1
22:05:19.881 68157   Encoding: frame:0.153832 needKeyframe:0
22:05:19.881 68157   frame:0.000000 encoded in: 170.146290 success:1
22:05:19.881 68157   frame:0.000001 encoded in: 28.323144 success:1
22:05:19.881 68157   Queuing 1 frames for encoding, total frames to be enqueued:1
22:05:19.881 68157   Encoding: frame:0.168344 needKeyframe:0
22:05:19.881 68157   frame:0.058049 encoded in: 20.977593 success:1
22:05:19.881 68157   frame:0.066757 encoded in: 20.198881 success:1
22:05:19.881 68157   frame:0.069659 encoded in: 19.721935 success:1
22:05:19.881 68157   frame:0.087074 encoded in: 19.450410 success:1
22:05:19.881 68157   frame:0.101587 encoded in: 5.902721 success:1
22:05:19.881 68157   frame:0.121904 encoded in: 4.249359 success:1
22:05:19.881 68157   All frames prior currentTime:0.165442 encoded
```

even though all frames were properly enqueued ; the FlushPendingData promise has been resolved, which indicates that the `VideoEncoder::EncodePromise` is not correctly resolved (way too early).

As this MacPro takes over 180ms to encode the first frame and we are asking for 200ms segments, it's missing the expected frames.

[Jean-Yves Avenard [:jya]]

This issue was already lodged as bug 297674

*** This bug has been marked as a duplicate of bug 297674 ***