Posts Tagged ‘youtube’

How to use ffmpeg to avoid having to open cinelerra to do simple video tasks, also I am starting a new channel on Youtube

November 14, 2016

I wanted to save the “workflow” I used for my last video.

Video? Oh yeah, I started a new Youtube channel. It’s just for practice. I want to get a cam-audio guitar practice vid up as close to daily as possible.

The channel is here:

I also have an old channel that I still upload to, in case you were wondering:

The first video I put up I used my full-featured nonlinear video-editing software of choice, cinelerra. But all I even *used* it for was to crop the beginning and end!

That first video is here:

I’m practicing an acoustic version of “The Suburbs” by Arcade Fire. I feel like the world is going to come to an end in a few days or weeks or months or years and in that mindset I am beginning to reinterpret some of the lyrics to this song in new ways.

For the second video, I was smarter, and did everything in the command line.

The second video is here:

I’m practicing “Suzanne” by Leonard Cohen. I’m pretty torn up about his passing and I want to learn his songs because I respect him so much.

Walker’s instructions for how to make simple videos:

  1. Record the video on your Flip cam.
  2. Get the file into a linux or mac computer with ffmpeg installed.
  3. Use the following command to take the audio out of the video:
    ffmpeg -i videofile.MP4 audiofile.wav
  4. Open the audio file in audacity. Apply noise reduction, then very light compression, then very light equalization (roll off extreme lows). Export to newaudio.wav
  5. Use the following command to remux the old video with the new audio AND trim the video:
    ffmpeg -i videofile.MP4 -i newaudio.wav -map 0:v -map 1:a -codec copy -ss 00:00:00 -t 00:04:00 remuxedvid.mkv
    Take note that one should replace “00:00:00” with the intended start time. Everything before that will be trimmed. “00:04:00” should be replaced with the total time. Everything after [start + total] time will be trimmed as well.

Compared to the first time around, I avoided 15 minutes of rendering and 15 minutes of reencoding. So using ffmpeg as much as possible and cinelerra as little as possible is usually the most time-optimal solution.

Also, by being sneaky I did all of this using the flip cam’s space. No need to delete temp files from two locations.

Walker’s new rule for doing video work: Do you need to composit something? Then use cinelerra. If you do not, then do not use cinelerra.


And Stuff Episode 008: Fast Paste Environment

January 7, 2016

This time we talk about … stuff?

Listen to And Stuff E08: Fast Paste Environment on Overcast.


@andstuffpodcast on twitter


Two-Day-Late Sunday Snapshot #5

July 28, 2015

Thinking about revamping this post series and using the Day One app to make it work better. Been trying to use Field Notes to take notes daily about what should go here but the analog-digital divide there is a little too much. Field Notes works best for me for having one page per activity, rather than one page per day. But Day One is specifically designed for one post per day.



Started taking coluracetam at TID 9mg. The only obvious effect is that my dreams are SO MUCH more memorable and vivid. It doesn’t seem to have any of the excess acetylcholine negative symptoms that I experienced with the other racetams I’ve tried, but I have noticed that I’ve been a little more tired than usual.

My tinnitus has improved significantly, which is probably due to the tianeptine, which I highly recommend everyone ever take.

Started using sulbutiamine more often as an alternate to caffeine, and that works well too, as long as I don’t overdo it.

So right now that’s my stack: tianeptine, coluracetam, NALT, caffeine, theanine, NAC. Occasional sulbutiamine and ALCAR.


I finished reading Reamde, and posted about it last post. I started Seveneves and it is absolutely amazing. I’m on about page 50 of about 600 or so. It reminds me of Arthur C. Clarke in that it’s got a lot of hard science in it, but the readability is really great. In fact, it’s probably Neal Stephenson’s easiest to read novel so far, despite all of the hard science.


Been using Pilot Juice almost exclusively, but that’s because I haven’t been doing much analog note-taking. Juice is by far the easiest to carry around all the time, so that’s that.

Content creation:

Uploaded a video of me making a bookmark for Kelsi. I spent a lot of time on the audio track for it and I’m pretty proud of it. Probably one of the best “in the box” MIDI sequencer-based compositions I’ve done.

Also found a nice ffmpeg incantation for turning an audio file into a video with visualizations, so I’m doing that to all the And Stuff podcast episodes and putting them on youtube. The audio quality is actually better than the actual podcast because youtube gives you infinite space and the free podcast host we’re using only gives you 50MB per month. So on youtube I’m using 384kbps aac for audio, and on podbean I’m using V9 mp3 (which is about 38kbps).

Two of the episodes are up so far:


Class is almost over, I hate it so much. Final is on thursday. I need to cram basically starting now, oops.


Did 9.0 miles, which is an improvement over the last few weeks. I’m loving cycling so, so much.

Anyway. Good week, I think.

Piano Phasing Music

October 20, 2014

More process music inspired by Steve Reich.

Two part exploration of sounds that come out of phasing a C Major scale. In the first part the two pianos are playing at different tempos, as in Reich’s “Piano Phase”, but in the second part they are playing in different meters, which gives a similar but not identical sound to Reich’s “Clapping Music”. It’s techincally more similar to phasing music written by Robert Fripp and Adrian Belew, such as certain parts of “Frame by Frame”, recorded by King Crimson.

Lots of fun sounds letting themselves be heard here. I haven’t decided what kind of experiment to do for next week yet. I’m thinking maybe a take on Terry Riley’s “In C”?

Clapping Music/Tape Music hybrid

October 13, 2014

This is a process music composition inspired by Steve Reich. It’s based on a clapping pattern similar to his “Clapping Music”, but manipulated more in the style of tape music, for example, Reich’s “It’s Gonna Rain”. Editing the loops digitally gives the benefit of being able to loop video at the same time, but has the downside of missing a lot of the cooler sounds that would have come out with the imperfections of tape.

Relatively successful experiment, I suppose.

I’m thinking about uploading a minimalist music experiment every Monday. I already shot and edited the one for next week. :)

Disappear (old Porcupine Tree cover)

October 6, 2014

Another old recording from January 2011. This one is an old Porcupine Tree b-side that has somehow stuck with me. Acoustic guitar vs. dobro guitar. :)

Jegus, I used to have so much hair.

Give me some more song requests and subscribe to me on YouTube!


Ambient Binary Bass

September 25, 2014

Made this video on Tuesday. I’m thinking the idea needs to be expanded to >30 minutes before the idea will go viral. Not really, but the idea does make me want to cut and paste together a one chord krautrock song of that length. Could probably only have three or four minutes of actual playing in it cut and pasted in weird ways.

The lower bass is counting binary numbers from zero to fifteen. Like if it’s playing A A E E then that’s 0011, which is three. The higher bass is playing five-digit numbers, so it’s actually in 5/4 time juxtaposed directly with the 4/4. Not that you hear the metrical mishmash because all the notes sound random anyway. The higher bass counts from 00000 to 11111, or zero to thirty-one. Thirty-two measures of 5/4 is 160 beats and sixteen measures of 4/4 is 64 beats, so I had the lower part repeat the count three times, but 3*64=192, so the higher part finishes 192-160=32 beats early. Math rock? Sort of?

The higher bass plays C# for a 0 and high A for a 1, so at any point you’re just hearing an A major chord: A C# E A, but with different notes missing at any point in time.

Give me some song requests and subscribe to me on YouTube!


Polymetric Generative Aleatoric Music

September 22, 2014

The other day I mentioned making polymetric generative aleatoric music. I was able to get the guitar part recorded but I can’t actually play keyboards well enough to actually play the melody. I guess I’ll be working on it and practicing.

Anyway, here’s a camcorder-quality version of just the guitars.

Oh yeah also give me song requests and subscribe to me on youtube.

Tapping Exercise Tab

September 17, 2014

I was asked to tab out my tapping exercise. I didn’t actually have it tabbed out, so I just looked at my hands in the video.

Walker's Tapping Exercise #1

The goal for me was to be able to play it just looking at a chord list.

First eight bars:

Gmaj7 Cmaj7 Gmaj7 Cmaj7 Gmaj7 Cmaj7 Gmaj7 D7

Here's how I arranged each chord:

e ----------------------------------------
B ----------------------------------------
G ----------------------------------------
D -----9-12------9-12------9-12------9-12-
A 9-10------9-10------9-10------9-10------
E ----------------------------------------

e ----------------------------------------
B ----------------------------------------
G ----------------------------------------
D -----9-10------9-10------9-10------9-10-
A 7-10------7-10------7-10------7-10------
E ----------------------------------------

e --------------------------------------------
B --------------------------------------------
G --------------------------------------------
D -----10-12------10-12------10-12------10-12-
A 9-12-------9-12-------9-12-------9-12-------
E --------------------------------------------

Minor part: (0:22)

Am7 Em7 Am7 Em7

These are the chords for this part:

e ----------------------------------------
B ----------------------------------------
G ----------------------------------------
D -----7-10------7-10------7-10------7-10-
A 7-10------7-10------7-10------7-10------
E ----------------------------------------

e ----------------------------------------
B ----------------------------------------
G ----------------------------------------
D -----9-12------9-12------9-12------9-12-
A 7-10------7-10------7-10------7-10------
E ----------------------------------------

Back to first part, but with a secondary dominant:

Gmaj7 Cmaj7 A7 D7

Here's the only one you haven't already used:

e ----------------------------------------
B ----------------------------------------
G ----------------------------------------
D -----7-11------9-12------9-12------9-12-
A 7-10------7-10------7-10------7-10------
E ----------------------------------------

Then end on G like this:

For notes in , tap and then release quickly enough that you don't mute the harmonic.
e --------------------------
B ----------------------
G -----------12---------
D ----------------------
A --------------------------
E --------------------------
*let the last note ring


Tap Guitar Practice

September 11, 2014

I’ve been trying to teach myself to play tap guitar. I’m pretty bad at it, but I wrote and recorded this exercise. Maybe I should arrange a tap guitar version of some pop song just for fun.

Oh yeah also give me song requests and subscribe to me on youtube. :)