Bug 357547

Summary:	Can't render webm
Product:	[Applications] kdenlive	Reporter:	qubodup
Component:	Rendering & Export	Assignee:	Jean-Baptiste Mardelle <jb>
Status:	RESOLVED FIXED
Severity:	major
Priority:	NOR
Version First Reported In:	unspecified
Target Milestone:	---
Platform:	Compiled Sources
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:
Attachments:	faulty webm render

Description qubodup 2016-01-04 22:12:17 UTC

Created attachment 96459 [details]
faulty webm render

Videos rendered to webm won't play back video in mplayer, vlc, ffplay. melt plays them back incorrectly.

Steps to reproduce:
1. Start kdenlive
2. Add color clip
3. Move color clip to timeline
4. Render
Destination: Web sites
Profile: WebM
All other: default value
5. View render result in
a) vlc
b) mplayer
c) ffplay
d) melt

Expected result:
a-d). Proper video playback

Actual result:
a,b) no video
c) no video, ffplay doesn't stop playin back when it reaches end
d) huge white video.
[matroska,webm @ 0x2743c20] Invalid EBML number size tag 0x01 at pos 3806 (0xede)
[matroska,webm @ 0x275ca60] Invalid EBML number size tag 0x01 at pos 3806 (0xede)
Not sure why it says matroska.webm I guess it might be using mks format instead of webm for some reason?

Attached is one webm output.

Note: when added before rendering, audio appears to be played back correctly in mplayer (others not tested).

This issue has been mentioned on the forums recently: https://forum.kde.org/viewtopic.php?f=265&t=130342#p348692

This might be related to https://bugs.kde.org/show_bug.cgi?id=348147

Comment 1 qubodup 2016-01-11 17:48:47 UTC

The issue persists in
kdenlive-git 15.13.0.r6895.171ad15-1
mlt-git r4157.v0.9.2.379.g676fcd8-1

It is of increased severity, as WEBM is the default render profile in the current render window.

Comment 2 qubodup 2016-04-07 07:13:50 UTC

webm rendering seems to work again