FFMPEG: how to overlay to video some data?

[marcorocchini]

Hi c**s

in a directory I have some .mxf video files e.g:

C0001.MXF
C0002.MXF
C0003.MXF
...
...
C0099.MXF
C0100.MXF

I would like do a batch that concatenate all this .mxf file in one output.mp4 file in wich is impressed (overlay video) this information data:

- name of the clip (e.g. C0033.MXF)
- timecode of initial_timecode of the clip (e.g. if C0033.MXF has 00:47:01:19, the "00:47:01:19" have to overlay in video in output.mp4 in the part of C0033.MXF clip)

is it possible avoiding use avisynth? thanks

[pandy]

Yes but not automatically and not in single step AFAIK (but i can be wrong as i'm newbie in ffmpeg).
You can use subtitle filter and create subtitle file with all those information - such file can be created more or less automatically but also probably in few steps

My crude batch scripting skills looks like: (forgot to mention that it will extract filename, start time and duration from files before concatenation - it can be later used by conversion to create subtitle file that can be overlayed on concatenated file so it is not full solution but only part - first step)

@echo filename,start_time,duration >fileinfo.txt
@FOR %%a IN (*.mxf) DO (@ffprobe -select_streams v -i "%%a" -show_entries "format=filename,start_time,duration" -sexagesimal -v quiet -of csv="p=0" >>fileinfo.txt)