RESOLVED FIXED216076
MediaRecorder timeslice parameter causing internal error on longer videos 
https://bugs.webkit.org/show_bug.cgi?id=216076
Summary MediaRecorder timeslice parameter causing internal error on longer videos
Paul
Reported 2020-09-02 07:36:45 PDT
Created attachment 407762 [details] Console errors on playback Using the latest STP, I'm trying to use the newly available timeslice parameter in the MediaRecorder.start() method. When creating short videos (~10 seconds) things seem to work as expected. However, when creating longer videos (1 minute or greater), the video will only play through a portion of the video and the console will log saying there was an internal webkit error. Steps to reproduce - 1. Visit https://codesandbox.io/s/media-recorder-6tlzb (sandbox is set to use a 1000ms timeslice) 2. Press "Start Camera" and allow permissions. 3. Press "Start Recording" and let the recording run for 1 minute or longer. 4. Press "Stop Recording" 5. Press "Play" Actual Results Playback is shorter than the recorded duration, and the console logs an internal webkit error. "Failed to load resource: WebKit encountered an internal error" "Failed to load resource: The operation couldn’t be completed. (WebKitBlobResource error 1.)" Expected Results Video plays through the same length as the recorded duration with no errors. Additional Information: Release 112 (Safari 14.0, WebKit 15610.1.25.5.1) macOS 10.15.6 (19G2021)
Attachments
Console errors on playback (160.74 KB, image/png)
2020-09-02 07:36 PDT, Paul 		no flags
Details
Patch (4.36 KB, patch)
2020-09-04 07:25 PDT, youenn fablet 		no flags
DetailsFormatted DiffDiff
Patch (6.20 KB, patch)
2020-09-04 08:16 PDT, youenn fablet 		no flags
DetailsFormatted DiffDiff
Show Obsolete (1) View All Add attachment proposed patch, testcase, etc.
Radar WebKit Bug Importer
Comment 1 2020-09-02 07:42:54 PDT
<rdar://problem/68209422>
youenn fablet
Comment 2 2020-09-02 07:52:00 PDT
I can repro this issue with the real camera but not the mock one.
youenn fablet
Comment 3 2020-09-02 08:13:12 PDT
Actually no, I just need to wait longer for this error to happen with mock. I am wondering whether this has to do with the size of the data.
youenn fablet
Comment 4 2020-09-04 07:25:55 PDT
Created attachment 407967 [details] Patch
youenn fablet
Comment 5 2020-09-04 07:29:21 PDT
Issue is related to blob resource loading. MediaRecorder can still be used to upload streamed data but it is difficult to directly play it.
youenn fablet
Comment 6 2020-09-04 08:16:13 PDT
Created attachment 407973 [details] Patch
Eric Carlson
Comment 7 2020-09-04 08:29:17 PDT
Comment on attachment 407973 [details] Patch Nice fix!
EWS
Comment 8 2020-09-04 09:11:14 PDT
Committed r266611: <https://trac.webkit.org/changeset/266611> All reviewed patches have been landed. Closing bug and clearing flags on attachment 407973 [details].
Paul
Comment 9 2020-09-08 05:58:07 PDT
Thanks Youenn!!
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