Hi Thierry,

Real error is here: "Could not write header".

Anyway:
ffmpeg -i input.mp4 -f segment -segment_time 1800 -reset_timestamps 1 -c copy output_%03d.mp4



W dniu 2026-03-16 o 12:33, Thierry SCHMITZ via ffmpeg-user pisze:
Hello ,
I can't find a working syntax for segmenting an input.mp4 file by 30 minutes 
duration.
> [...]
[mp4 @ 000001eea55f6840] Invalid segment filename template 
'outputC:\Data\bin\Split_Mp4_30min.cmd3d.mp4'
[out#0/segment @ 000001eea55cb480] Could not write header (incorrect codec 
parameters ?): Invalid argument


--
Pozdrawiam,
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