Kdenlive playhead doesn’t reposition on Linux

I use Kdenlive for editing videos when I have the occasional need to edit videos.  In recent versions of Kdenlive (e.g., 17.07.70), I have been running into a problem that has been driving me crazy.  The line that runs across the timeline editor, which is called the “playhead,” has been freezing in place.  I could click on a location and that location would show up in the Project Monitor one time, but when I tried to click anywhere else in the editor or move the playhead, it wouldn’t move.  It would stay where it was.  This made Kdenlive unusable.

Here’s a video illustrating the problem:

It took forever to find the solution to the problem, and the solution reveals that this is a bug in this version of kdenlive.  Apparently what is causing the problem is having multiple processor threads turned on in the settings in kdenlive.  Go to Settings -> Configure Kdenlive.  You’ll get this window:

Go to the Environment tab and you’ll see this:

If you’re having this problem, you’ve probably got your Processing threads variable set to something other than 1.  I had mine set to 8, thinking the 8 core cpu I have would speed up the editing process for 4k video.  As it notes in the screenshot, any threads above 1 is experimental.  By experimental, I guess the Kdenlive developers really mean “unusable.”

To solve the playhead not being movable problem, set the Processing threads variable to 1 (I tried other values as well, and only 1 works).  Hit OK.

Then restart Kdenlive. You should now be able to drag your playhead around again and edit videos, like this:

Donald Trump hair PNG

Impeach the Peach #impeachthepeach

I keep wanting to put Donald Trump’s hair on different things.  Whenever I search for “Donald Trump’s hair png,” I don’t find anything.  So I went ahead and made my own Donald Trump hair png file.   Here you go:

Donald Trump hair png
Donald Trump hair png

I wanted it this time to make this:

Impeach the Peach #impeachthepeach
Impeach the Peach #impeachthepeach

If you make something with this, please let me know in the comments.

Triple Falls Trail – Dupont Forest, North Carolina

I was attending a conference in Asheville, NC, and had half of a day free.  Rather than stay cooped up in my hotel, and knowing there were hills in the area, myself and my colleagues, took a trip out to Dupont Forest to hike Triple Falls.

We didn’t have a lot of time – just about an hour and a half.  That worked well for the hike as it isn’t particularly long.  Also, there was a risk of rain.  There was a light drizzle in the surrounding area as we approached the hike, and a light mist at times for parts of the hike.  The light mist was nice as it cooled us down while we climbed the hilly sections.

Here are a few videos from the hike:

We made it to the top of the falls fairly quickly. Here are a couple of videos of the scenic view from the covered bridge that crosses the river just above the top fall:

Just as we were headed out of the covered bridge, which provided some protection from any possible rain, the rain really picked up.  It lasted for about 20 minutes and got us pretty wet. Despite getting soaked, it was a fun hike and I’m sure even more delightful on a bright, sunny day.

Here’s the GPS track:

Hiking in Silver Springs State Park

I was invited to give a presentation to a freethought group in Ocala and thought it might be a good opportunity to explore a little more of Florida.  I looked up hikes near Ocala and found Silver Springs State Park.  From what we were told by some of the people where I gave my presentation, Silver Springs used to be a privately owned amusement park and Florida’s first tourist attraction. Apparently, the park fell on hard times and eventually was taken over by the state.  Now it’s a state park with boat rides on the springs and some hiking trails.

My presentation was supposed to be in the early afternoon, so we decided to go to Silver Springs State Park in the morning, try to get a hike in, go to my presentation, and then come back for another hike afterward.

We got a bit later start than we had hoped as we had to pick up a few supplies before we left Tampa.  We got to the park around 11:30 and walked through the main area where they sell boat rides and have a restaurant.

Toren and Ryan at Silver Spring State Park
Toren and Ryan at Silver Spring State Park

We managed to get in a short hike in the primary part of the park before we had to leave for my presentation. We did a newly created hike called Creek Trail, which wasn’t much of a hike.  It looped around in a circle, with Silver Springs Blvd. on one side and Silver River on the other side.  It did give a bit of a sample of what Florida’s natural land looks like, but it was a very quick taste.  Here’s the route:

We had to leave after the hike to get to my presentation on time.  The presentation went well and then we went to a late lunch with some of the people who were at the presentation.  After lunch, we headed back into the park to do another hike.  This one was a bit longer.  It took us through some Florida wilderness and eventually to the Silver River, as seen in this photo.

Debi and Toren by Silver River
Debi and Toren by Silver River

The trail then looped back around.  This was called the Swamp Trail; here’s the route:

After that hike it was getting dark, so we headed out for a bite to eat and headed home.  It was a fun little outing.  No elevation gain, of course, but a good chance to stretch our legs in Florida wilderness.

transferring some email between Gmail accounts using Thunderbird

I have several Gmail accounts for various reasons.  Occasionally I have the need to transfer emails between the accounts.  The only way to transfer just some email between Gmail accounts is to use a desktop email client, like Thunderbird, Evolution, or KMail.  Unfortunately, the process isn’t all that straightforward and can be quite confusing at times.  I prefer using Thunderbird for transferring emails between Gmail accounts, so I’m going to show how to do this using Thunderbird.

To begin with, you need to enable IMAP support in your Gmail accounts.  You can see how to do that here.

Next, you need to set up at least two Gmail accounts in Thunderbird (I’m assuming you have it installed, if not, install it).  Thunderbird now makes this very straightforward.  When you first open Thunderbird, it will ask you to set up an account.  You can fill in your username and password at that time or do it later.  If you need to set it up later, you click on File -> New -> Existing Mail Account:

You’ll get this window.

Fill in your information and Thunderbird will take care of the rest.

Once you’ve got your accounts set up in Thunderbird, you need to let Thunderbird download the emails in the various accounts before you can start transferring.  To get this process started, click on “All Mail” in each of the accounts you are using and Thunderbird will start downloading the relevant data it needs to manage the emails.

Depending on how many emails you have, this may take a while.  Go get a snack or read a book.

Once Thunderbird has downloaded all the emails, you can begin transferring the emails between accounts.  However, here’s where things get tricky.  I’ve fiddled around with lots of different ways to make the transfer work, and the only one that seems to reliably work is weird.

First, open the Gmail account you are transferring files from [Gmail Account #1] in a browser (not in Thunderbird) and empty your trash.

Don’t try to empty your trash in Thunderbird as it doesn’t do anything. And you really want your trash empty for what we are about to do.

[NOTE: Scroll down to the section on the Large Email Problem before you continue.  No, really, go read that section right now as it will save you a lot of time later.]

Now, go back to Thunderbird. Select the emails you want to move in [Gmail Account #1] and, I know this is a little scary but, drag them to the trash in Thunderbird.

Once you drag them to the trash, they will no longer show up in All Mail, but they are not deleted, they are just in the trash (they have been labeled with the tag “trash”).  Once they are in the trash, select all the ones you want to move and drag them to the All Mail folder in the receiving account – [Gmail Account #2].

In the bottom bar in Thunderbird you’ll see a status update which will tell you how many files have transferred.

Once they have copied, you can check to see if they are in the receiving account [Gmail Account #2] by opening that account in a browser and using the search function to find those emails.  Once you’re positive that they have transferred, you can then go back to [Gmail Account #1] in your browser, open your trash, and empty your trash.  The emails are now in [Gmail Account #2] and are no longer in [Gmail Account #1].


Well, sort of.  There are a couple of issues you may run into.  First, it’s probably not a good idea to try transferring more than a few hundred to maybe a 1,000 emails at a time as the Gmail accounts have some limits on things like this.  Also, emails that are larger than about 5mb in size won’t transfer.  I don’t know why, but they won’t. other things you need to know before you try the above.

How to solve the Large Email Problem

There is a problem transferring large emails using this process.  The problem is attachments that are above 5mb in size won’t transfer between the accounts.  So, you can either forward those emails manually or delete the attachments.  Here’s how you find the attachments in Thunderbird:

Click on Tools -> Message Filters.

Once the Message Filters window comes up, click on New.

You’ll then get a new window, the Filter Rules window.  You need to name your Filter.  I called mine “large attachments.”  You’ll also need to indicate when you want the filter to run.  I set mine to manual only (see screenshot below).

Next are the filter rules.  What we’re looking for are attachments that are above 5mb in size.  Here’s how I set up my filter.  I wanted Thunderbird to first find all the emails that have attachments, so I added the following filter (note, this is probably unnecessary as the second filter will find these anyway):

Attachment Status = is = Has Attachments

I then wanted only emails that were above a certain size.  Since the offending emails are 5mb in size, I looked for all emails above 4000KB in size with the following filter:

Size (KB) = is greater than = 4000


Finally, I was interested in emails from just a specific date range, so I used a filter to only select emails before a certain date:

Date = is before = 01/01/2011

With the filter options in place, we need to tell the filter what to do with the emails that fit the criteria.  I tagged them with a tag I don’t use for anything else using the following in the “Perform these actions:” section of the Filter Rules window:

Tag Message = Later


Once you’ve got your filter set up, select OK.  You can then close the Message Filters window.  When you’re ready to run the filter, go back up to Tools -> Run Filters on Folder:

The filter will run and tag all the offending emails.  Then, from the top of Thunderbird, you can do a quick filter on the emails that you have in that folder by selecting on the “Tags” option and all the offending emails will filtered:

You can then decide if you want to delete the emails or forward them directly to the other gmail account (which means the date will be changed to the current date rather than keeping the original date, which bugs me).  Alternatively, you can just delete the attachment, which is done at the very bottom of Thunderbird:

NOTE: If you delete the attachment in Thunderbird, it doesn’t actually end up deleting the email.  It creates a copy without the attachment but leaves the email with the attachment.  You’ll then need to delete the email with the attachment before you transfer the files.