Automatically stop rendering at the last animation frame.

Support Synfig related help
1

Hi all,

I’m implementing a batch process to render a bunch of animations using the command line interpreter.

I want to know if there is a way to tell the renderer to render up to the last keyframe of an animation, instead of providing the start and end times.

Each animation has different length and I don’t know exactly it (well, yes if I open synfig studio and take a look :slight_smile: ).

Something like a special key to tell the renderer to stop, or something similar will be also valid.

Thank you very much,
D.

2

Unfortunately there is not interface to know the last keyframe (or waypoint) of the document. There is not option rather than open the composition in Synfig Studio…
… or create a parser that opens the sif file and search for the last waypoint or keyframe… :slight_smile:

carlos@pcnuevo:~/Animación/commandline$ grep 'keyframe' anim1.sif <keyframe time="0f"/> <keyframe time="1s 3f"/> <keyframe time="1s 11f"/> <keyframe time="1s 15f"/> carlos@pcnuevo:~/Animación/commandline$
I’m not so good at bash language but I’m sure that it is possible to create a script that extract the latest keyframe. They are listed in order :wink:
-G

3

Thanks for the clue Genete!
I’ve just got it working correctly with the following command lines:

Extract and send to stdout the time of the last key frame:

REM contents of keyext.bat:
gzip -d -c %1 | grep "keyframe" | tail -n 1 | sed "s/.*\"\(.*s\)\( \)*\(.*f\)*\".*/\1\3/"

Render the animation properly using the retrieved information:

for /F "tokens=*" %%i IN ('call keyext.bat anim.sifz') DO SET KEYFRAME=%%i "C:\Archivos de programa\Synfig\bin\synfig.exe" --start-time 0 --end-time %KEYFRAME% anim.sifz -o frame.png

Although we should recognise this is hardcore stuff :mrgreen:

Probably this is something that can be done by default in further releases, don’t you think?

Thank you!

4

Indeed!

Yeah! it is not a extremely difficult modification. Maybe you dare to code it? What’s your C++ background?
(my bash background is awful!)
-G

5

I learnt from one of those books called “teach yourself c++ in 25 days”, I started last week! :mrgreen:

I must admit, I downloaded the code and took a look at it yesterday :slight_smile: but preparing the environment to compile and develop is something that can take some time so I quit it :neutral_face:

Ok, Whenever I had time i’ll try to make the fixes by myself, and send them to the comunity.
Thanks!

D.