How to choose the segment sequence start number?

Question

I\'m using FFmpeg to split a file into chunks using the segment muxer.

The output is named output%03d.mp4, but the first output file is output000.mp4

Answer 1

Use the -start_number option to declare a starting number for the sequence. This is useful if your sequence does not start with img001.jpg but is still in a numerical order. The following example will start with img100.jpg:

ffmpeg -f image2 -start_number 100 -i img%d.jpg /tmp/a.mpg

For more see at 3.2 How do I encode single pictures into movies?

Answer 2

Use the -segment_start_number 1 output option.

See the segment muxer documentation for more information and options.