Speed control and annotation

jasper- commented 11 years ago

Hi,

Love this tool, just great.

As two feature requests, could you consider to build in:

Speed control during playback
Adding the possibility to add annotation (dunno how, maybe by adding timestamp - annotation and displaying it on top or bottom of the playback window)?

Thanks,

Jasper

ku1ik commented 11 years ago

Annotation is planned. And the playback speed.. You can already adjust it by appending "?speed=3" to the URL (1 is normal speed).

absorber commented 9 years ago

Separate control on the player (or near it) would be IMO even better. This way users can change the speed on the fly (instead of currently having to refresh the page after adjusting the ?speed= variable in the URL).

nathany commented 9 years ago

The FAQ mentions that editing the ascii cast would be quite difficult. What about just more granular speed control? Basically to speed up slow portions to make the end result flow better?

That would also lend to synchronizing with audio by tweaking the speed to align with a spoken script.

ku1ik commented 9 years ago

You can use --max-wait option to rec to optimize terminal inactivity and make the end result smoother and less boring.

Also, there's 1.0.0.rc1 which introduces new asciicast format which is JSON based, and allows editing (if you know what you're doing).

nathany commented 9 years ago

That is the catch. Right now it would be difficult to visualize where changes are needed, though making those changes would certainly be possible in the current file format.

I think two things could help make editing easier, without having to actually build an asciicast editor:

Including some sort of time code in the JSON just for human consumption. That could be as simple as a frame number.
A debug mode in the player that overlays that time code.

Then I could see that at frame 311 I need to reduce the duration, tweak the JSON, replay the video again.

Though an ascii video editor would be sweet too :-) Have you heard of Monodraw?

ku1ik commented 9 years ago

I was thinking if replacing pause time with absolute time, i.e. timestamp wouldn't be better here. However, while it would allow one to quickly find the right spot, it would make changing harder, because if you wanted to make one pause shorter you would need to update all following timestamps too.

I think we should be good for now with the format introduced in rc1. Also, it will be very easy to build additional tools for post-processing asciicasts. They could do things like making it twice as fast by dividing all delays by 2, removing/replacing some text etc. Imagination is the limit :)

I haven't heard of Monodraw but it looks very very cool!

nathany commented 9 years ago

That's why I suggested making the time code for human consumption. Just a frame number for people viewing the file, not something that the player uses.

Obviously tools could solve this problem too, which would avoid bloating up the JSON with debug data.

ku1ik commented 9 years ago

Yeah, I don't think I'd like to bloat up the JSON with this. I mean, this is interesting idea, and thanks for suggesting it. The thing is, we would need to display frame number during playback. It would be more tricky to do for playback in terminal, while pretty straightforward to do for playback in browser. Anyway, it would require some additional work, and I have many more important things to implement for asciinema on my plate right now :)

nathany commented 9 years ago

:-) Ok

ku1ik commented 9 years ago

@absorber @jasper- you can now now use < and > keys to change playback speed. There's no visual feedback when changing this yet but I'll be adding some indicator to the player's UI.

probonopd commented 5 years ago

Can one reprocess an already-existing asciicast file like https://s3-eu-west-1.amazonaws.com/asciinema-bb-eu/uploads/asciicast/file/218612/ascii.cast?response-content-disposition=attachment%3B%20filename%3D218612.cast&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAJBUMR4677QX6BM7Q%2F20190118%2Feu-west-1%2Fs3%2Faws4_request&X-Amz-Date=20190118T225531Z&X-Amz-Expires=3600&X-Amz-SignedHeaders=host&X-Amz-Signature=ce0119ead137774b0e5ab4efc51a0c9934cc9a3b8ab57e3884ad8ffc301e4455 to contain less pauses?

rlogiacco commented 2 years ago

is there any way I can help with the implementation of an annotation system? I believe this is a great tool and I plan to use it to create tutorials: right now my "annotations" are echo commands, but you can imagine that's not really optimal

bkil commented 2 years ago

asciinema / discussions

Speed control and annotation #189