[FLEX-18866] VideoDisplay hangs when seeking a video with only 1 keyframe

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: Adobe Flex SDK 3.3 (Release)
• Component/s: mx: Video
• Environment: Affected OS(s): All OS Platforms; Affected OS(s): All OS Platforms; Browser: Firefox 3.x; Language Found: English
• Assignee: Unassigned
• Reporter: Adobe JIRA
• Created: 22/Apr/09 01:46
• Updated: 22/Apr/09 01:46

Description

This problem existed in Flex 2.0.1, and still exists in Flex 3.3.
Steps to reproduce:
Create a Flex project with the following application MXML:

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="vertical">
<mx:VideoDisplay id="vid" source="http://comp.mixpo.com/ti/035a8078-3d4b-4937-850e-7d538d903030/FLV640.flv"
autoRewind="false" autoPlay="false" />
<mx:Text text="

{vid.state}

" />
<mx:HBox>
<mx:Button label="Play" click="vid.play()" />
<mx:Button label="Pause" click="vid.pause()" />
<mx:Button label="Seek" click="vid.playheadTime = 5" />
</mx:HBox>
</mx:Application>

1. Compile and run it and watch the status message (which is the video state).
2. When it is done loading, click Play.
3. Click Seek to seek 5 seconds into the video.
4. The video status is "seeking", and never changes.

Actual Results:
The video status is "seeking", and never changes.

Expected Results:
The video would seek to the beginning, and return to the "playing" or "stopped" state.
This video file is very short (12 seconds) so it has only 1 keyframe. So Flash Player should discover this while attempting to seek further into the video, and eventually fall back to the beginning.

Workaround (if any):
Looking at the code for VideoPlayer, it appears to have some incomplete seek failure/recovery code. For example, there is a variable invalidSeekTime whose value is tested in a few places, but its value never changes from false!
I fixed this seeking problem by modifying the VideoPlayer.httpOnStatus function, by changing the case for "NetStream.Play.Stop" to:
case "NetStream.Play.Stop":
delayedBufferingTimer.reset();
if (invalidSeekRecovery)

{ invalidSeekTime = false; invalidSeekRecovery = false; setState(cachedState); seek(0); }

else if (invalidSeekTime)

{ recoverInvalidSeek(); }

else
switch (_state)

{ case PLAYING: case BUFFERING: case SEEKING: httpDoStopAtEnd(); break; }

break;