Video is http://samples.ffmpeg.org/mov/multitrack/multitrack.mov and the way I tried is loading it directly as a URL address.
Works fine here, no error. The only issue I can notice is that both tracks have the same "en" label in the track menu. Would be nice if you provided logs, what is the error?
Created attachment 466942 [details] gst log, compressed
I reproduced in debug in GTK
Ah so what you wanted to report actually is that the video doesn't render, right? The initial bug description doesn't mention that. 0:00:04.451478718 49 0x55e4466b3e40 WARN uridecodebin gsturidecodebin.c:982:unknown_type_cb:<uridecodebin0> warning: No decoder available for type 'video/x-rle, layout=(string)quicktime, depth=(int)2 4, width=(int)720, height=(int)486, framerate=(fraction)4/1, pixel-aspect-ratio=(fraction)1/1'. We just need this decoder in the SDK, I think: avdec_qtrle
Pull request: https://github.com/WebKit/WebKit/pull/15603
Interesting. I assumed it was audio only :) I actually meant that sometimes playback stopped and some other times it was giving an error. Maybe they are related. The log you're seeing is the one of the sudden stop.
Committed 265836@main (29e41d3d6688): <https://commits.webkit.org/265836@main> Reviewed commits have been landed. Closing PR #15603 and removing active labels.
<rdar://problem/111896653>