videostream | Play html5 video when from a file-like object | Runtime Evironment library

You need to initialize a context on your canvas before being able to capture a stream from it, to do so, you call its getContext() method.

Then you'd need to use that context's methods to actually draw something on it, that's what will get captured by the MediaStream.

Appending an element inside a canvas won't draw that SVG image on the canvas context. To draw an SVG image on a 2D context you'd generally go through an element, load the SVG image as a standalone document into this and when loaded draw it on the 2D context using its drawImage() method. (cf this answer of mine showing how to do so from an inline )
However, drawImage() always draws only the first frame of an animated image, so for your case it may not be so useful.
In fact, there is really no easy way to draw an SVG animation on a canvas. You could try to produce one new standalone SVG document per frame manually, updated all the computed styles or the SMIL state and draw that through an . But loading the image will be asynchronous, producing it may be computation heavy, it will probably be memory consumptive and the whole process has big risks of desynchronizing with the actual animation.

An alternative solution would be to use the 2D context's drawing API to reproduce the SVG, that at least would be synchronous, so less risk of desync, but a more complex code to write (some libraries like canvg may help in this task, though you'd still have to find the way to extract the current state of your animation at every frame).

This is a problem I once had when attempting to send numpy images (converted to bytes) through sockets. The problem was that the bytes string was too long.

So instead of sending the entire image at once, I sliced the image so that I had to send, say, 10 slices of the image. Once the other end receives the 10 slices, simply stack them together.

Keep in mind that depending on the size of your images, you may need to slice them more or less to achieve the optimal results (efficiency, no errors).

It is possible to:

1. Download the playlist using HTTP Request sampler and Save Responses to a file listener so it would be saved to your local drive. See Performance Testing: Upload and Download Scenarios with Apache JMeter article for more comprehensive instructions if needed

2. Amend the playlist as needed using JSR223 Sampler or OS Process Sampler

3. In the bzm - Streaming Sampler use local URL via file URI scheme i.e.

You have done too many API actions in YouTube. If you reach 10.000 points per day you are limited. Read about it here: https://developers.google.com/youtube/v3/getting-started#quota

And you can read about similar things in another StackOverflow Question.

Ok, answering my own question for anyone running into this problem in the future. The problem was in the IAM part. The bucket in which the result had to be written was in another project and the default service account created for the transcoder (which is conveniently hidden from the service accounts page!) has only access to buckets within the same project. So I had to add permissions for this service account to write to the bucket. A more describing error message would have been very helpful.

This isn't the general solution that I was looking for, I added a timeout variable to the client constructor, and within client.run() I added asyncio.sleep(timeout) which would exit the loop. This is enough for my purposes.

So in the end I just downloaded the clips, saved it to the disk on runtime, merged them using mp4parser and upload to S3. Afterwards I just deleted those on my disk.

If anyone curious about the code, it is taken from https://github.com/sannies/mp4parser/blob/master/examples/src/main/java/com/googlecode/mp4parser/AppendExample.java

Thank you.

 You have to make sure that files deploy.prototxt and res10_300x300_ssd_iter_140000.caffemodel are in the correct directory, then use os.path.join

You can use Component.onCompleted signal to do things right after component is created.

The onCompleted signal handler can be declared on any object. The order of running the handlers is undefined.