white flash like frames at end of clips

Bug #423550 reported by blokkendoos on 2009-09-03
64
This bug affects 12 people
Affects Status Importance Assigned to Milestone
OpenShot Video Editor
Undecided
Unassigned

Bug Description

When playing most of the imported avi files in the preview pane, they 'flash' at the end. This flashing will also show up when exported. The 'flashes' don't show when the file is played in Totem or VLC.
When I try to trim the scene to get rid of this annoying behaviour, sometimes I can trim it away, but other times new flashing endings appear.

OS: 32 bit Ubuntu 8.04, Kernel 24-24
No build, just installed debs.
OpenShot 0.9.22

Just for fun, try trimming the right edge of the clip and see if it still
flashes. If you have a small avi example, feel free to attach the file to
this bug report.

Thanks,
-Jonathan

On Thu, Sep 3, 2009 at 1:41 AM, blokkendoos <email address hidden> wrote:

> Public bug reported:
>
> When playing most of the imported avi files in the preview pane, they
> 'flash' at the end. This flashing will also show up when exported. The
> 'flashes' don't show when the file is played in Totem or VLC.
> When I try to trim the scene to get rid of this annoying behaviour,
> sometimes I can trim it away, but other times new flashing endings appear.
>
> OS: 32 bit Ubuntu 8.04, Kernel 24-24
> No build, just installed debs.
> OpenShot 0.9.22
>
> ** Affects: openshot
> Importance: Undecided
> Status: New
>
> --
> white flash like frames at end of of clips
> https://bugs.launchpad.net/bugs/423550
> You received this bug notification because you are the registrant for
> OpenShot Video Editor.
>
> Status in OpenShot Video Editor: New
>
> Bug description:
> When playing most of the imported avi files in the preview pane, they
> 'flash' at the end. This flashing will also show up when exported. The
> 'flashes' don't show when the file is played in Totem or VLC.
> When I try to trim the scene to get rid of this annoying behaviour,
> sometimes I can trim it away, but other times new flashing endings appear.
>
> OS: 32 bit Ubuntu 8.04, Kernel 24-24
> No build, just installed debs.
> OpenShot 0.9.22
>

have a look at the attachment

I can confirm this behavior. I see the white flashes. I'm guessing this is
a bug with MLT or FFmpeg. A work-around is to trim just a little bit off
the end of the video clip, and the white flash goes away. I will look into
the MLT bug list and see if this is already reported.

Thanks,
-Jonathan

On Wed, Sep 9, 2009 at 2:57 AM, blokkendoos <email address hidden> wrote:

> have a look at the attachment
>
> ** Attachment added: "white flashing at end of avi file"
> http://launchpadlibrarian.net/31524692/P8314400benen.AVI
>
> --
> white flash like frames at end of of clips
> https://bugs.launchpad.net/bugs/423550
> You received this bug notification because you are the registrant for
> OpenShot Video Editor.
>
> Status in OpenShot Video Editor: New
>
> Bug description:
> When playing most of the imported avi files in the preview pane, they
> 'flash' at the end. This flashing will also show up when exported. The
> 'flashes' don't show when the file is played in Totem or VLC.
> When I try to trim the scene to get rid of this annoying behaviour,
> sometimes I can trim it away, but other times new flashing endings appear.
>
> OS: 32 bit Ubuntu 8.04, Kernel 24-24
> No build, just installed debs.
> OpenShot 0.9.22
>

Helen McCall (wildnfree) on 2009-09-16
Changed in openshot:
status: New → Confirmed

On another machine, Ubuntu 9.04, 32 bit, kernel 2.6.28-15, OpenShot from today's PPA (! great work) I suddenly noticed the flashes again. But trying to decide where they resided, at the end or at the beginning of the next shot, I noticed something strange.
The preview pane contained an image while the timeline indicator was in an 'emty' space (between two seperated shots). The zoom-factor was 2 secs.
I took a screenshot, but in the screenshot the preview pane is black. Could it be the timeline is not synchronised with the preview and that this somehow creates the flashes?

In the enclosed attachment you'll find the screenshot.

Jonathan Thomas (jonoomph) wrote :

@blokkendoos,
We are trying to get a list of incompatible video files, so I'm revisiting this bug report. =) If you have time, could you take a look at this FAQ, and include the additional info for this bug report. Thanks!
https://answers.launchpad.net/openshot/+faq/983

tags: added: mlt-file-compatibility
Geoff (geoff-saliba) wrote :

I had the same problems with mov, mpg, avi formats. The only work around I could find is to use oggconvert to convert to matroska. This allowed me to render without the white flash at the end, however the audio keeps going for a second or so.
I can't see this being an incompatible video file error. Another problem is the video preview works really slowly when I use these converted files.
I'm still working on finding other workarounds, however has any one else found other workarounds?

Sergey Snitsaruk (narren96c) wrote :

Similar problem with AVCHD in lucid beta2.
ffplay plays fine, though it still has "missing picture" issue.
melt gives white flash and this in log:
[h264 @ 0x2afbcd0]missing picture in access unit

ffmpeg -i:
Input #0, mpegts, from '00140.MTS':
  Duration: 00:00:02.40, start: 0.483189, bitrate: 24229 kb/s
  Program 1
    Stream #0.0[0x1011]: Video: h264, yuv420p, 1920x1080 [PAR 1:1 DAR 16:9], 50 tbr, 90k tbn, 50 tbc
    Stream #0.1[0x1100]: Audio: ac3, 48000 Hz, stereo, s16, 256 kb/s

Techie (adzinets) wrote :

AVCHD from Canon HF-100:
1) ffplay plays fine, no flash at the end, seek works intermittently sometimes giving tons of errors like these:
[h264 @ 0xbd1f60]non-existing SPS 32 referenced in buffering period
[h264 @ 0xbd1f60]non-existing PPS referenced
[h264 @ 0xbd1f60]B picture before any references, skipping
[h264 @ 0xbd1f60]decode_slice_header error
[h264 @ 0xbd1f60]no frame!
2) melt, same thing but gives a flash at the end
3) ffmpeg -i:
Input #0, mpegts, from '00014.MTS':
  Duration: 00:00:48.96, start: 0.482433, bitrate: 16288 kb/s
  Program 1
    Stream #0.0[0x1011]: Video: h264, yuv420p, 1920x1080 [PAR 1:1 DAR 16:9], 50 tbr, 90k tbn, 50 tbc
    Stream #0.1[0x1100]: Audio: ac3, 48000 Hz, stereo, s16, 256 kb/s

Andy Finch (fincha) on 2010-09-14
summary: - white flash like frames at end of of clips
+ white flash like frames at end of clips
reindeer (reindeer) wrote :

I experience a similar error (the same?) with videos created by OpenShot 1.1.3 on ubuntu 9.10 2.6.31-22-generic #63-Ubuntu SMP on a 64bit machine.

The "flashes" are sometimes almost a second long though the two tracks overlap and are connected with a "fractal 4" effect (appears also with other effects).

I have a different behaviour than described in the original bug report: I see white frames also in videos played by VLC and totem.

I am inserting AVCHD material into the tracks without previous conversion. This makes scrolling in the preview difficult anyhow (grey shading effects when scrolling manually), but also the export is effected.

I tried different resolutions - this does not influence the bug.
As video codec, I am using mp4, libx264. I also tried matroska, libx264 - with the same effect.

Andy Finch (fincha) wrote :

Won't fix - passed upstream to MLT, but there is no fix for this. See:

https://sourceforge.net/tracker/index.php?func=detail&aid=3076778&group_id=96039&atid=613414#

Changed in openshot:
status: Confirmed → Won't Fix
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