When using ffmpeg to output a series of frames as images, the only format I can find documentation for is frame_%d.jpg. The %d identifier is replaced by the sequential frame count.
Are there other parameters I can use in the output file format? Specifically, I need the ability to add the timestamp of the specific frame.
Turns out this behavior was not yet implemented at the time.
I implemented an initial version of %t support on my fork of FFmpeg (https://github.com/yuvadm/FFmpeg), and am currently working on cleaning up the patch so that it can be merged upstream.