Hello,

My versions:
kdenlive 0.9.6-2
mlt 0.9.0-3
xf86-video-ati 1:7.2.0-1

Videos from various sources (smartphone cameras, taken online, screen recordings made with ffmpeg) fail to import and display properly in Kdenlive. This has worked on this Arch Linux 64bit machine before and probably started after some software update or another.

Here is an example, recorded with a Lumia 820, which imports into Kdenlive as a video with working audio but white screen image only:
Download original mp4 file: https://app.box.com/s/dpiuc8kifodgp7scnfi7
YouTube upload for viewing: http://youtu.be/n9EitYNiaf0


Kdenlive after importing the original mp4

When starting Kdenlive, I get these messages:

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QWidget::insertAction: Attempt to insert null action
QWidget::insertAction: Attempt to insert null action

When dragging this file into Kdenlive's project tree, I get these messages:

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"/org/freedesktop/UDisks2/drives/ST31000524AS_6VP2JEGX" : property "DeviceNumber" does not exist
"/org/freedesktop/UDisks2/drives/ST31000524AS_6VP2JEGX" : property "Device" does not exist
QCoreApplication::postEvent: Unexpected null receiver
[h264 @ 0x7f720c6f2800] get_buffer() failed
[h264 @ 0x7f720c6f2800] thread_get_buffer() failed
[h264 @ 0x7f720c6f2800] decode_slice_header error
[h264 @ 0x7f720c6f2800] no frame!

Complete command line output: http://codepad.org/ICHpgIqV

If I try using the files, I get the following error in Kdenlive's UI:

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VDPAU failed to initialize decoder (An invalid/unsupported VdpDecoderProfile value was supplied.)

Kdenlive after 'layering' the imported mp4

If I convert the file to .webm format (other formats might also work) using ffmpeg, I can work normally and all I get are these CLI messages:

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"/org/freedesktop/UDisks2/drives/ST31000524AS_6VP2JEGX" : property "DeviceNumber" does not exist
"/org/freedesktop/UDisks2/drives/ST31000524AS_6VP2JEGX" : property "Device" does not exist
kdenlive(1829) Render::checkMaxThreads: // TRACTOR PROBLEM

Any ideas what the VDPAU issue might be and whether it is at all related to the fact that most videos import with faulty image into Kdenlive? Is there a way to disable VDPAU?

Thanks.

Kdenlives bug report page http://www.kdenlive.org/node/872 suggests try these two things as first steps for diagnosis of issues like this.

Try playing your video file with FFmpeg's player. From a terminal: ffplay myvideo.mpg
Try playing your video file with MLT's player. From a terminal: melt myvideo.mpg

ttguy wrote:Try playing your video file with FFmpeg's player. From a terminal: ffplay myvideo.mpg
Try playing your video file with MLT's player. From a terminal: melt myvideo.mpg

ffplay displays the video correctly.
melt 0.9.0 displays white only (CLI output: http://codepad.org/FaZx1V0d )
melt-git "melt 0.9.1" 20120912 does the same ( http://codepad.org/6sX8gzix )

I guess I'll write an mlt bug report. Thanks for the pointer.

The issue is that VDPAU (an NVIDIA library) is being used, even though the hardware does not support it (I have an ATI graphics card).

One can either disable it using an environment variable

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MLT_NO_VDPAU=1 kdenlive

or you can remove "--avformat-vdpau" from the `./configure` command line when compiling mlt.

I received much help in the MLT issue tracker:
https://sourceforge.net/p/mlt/bugs/199/

Thanks to all!