I want to add timestamp of current played time to a video, so I use this: ffmpeg -i video.mkv -filter_complex "drawtext=fontfile=/Library/Fonts/Arial.ttf: text='timestamp: %{pts \: hms}': x=5: y=5: fontsize=16: fontcolor=yellow@0.9: box=1: boxcolor=blue@0.6" -c:a copy -c:v libx264 -map 0 output.mkv

This comes out that the timestamp was in hh:mm:ss:mm format, but I want it in hh:mm:ss format. So how can I achieve this goal?

up vote 0 down vote accepted

Use

text='timestamp \: %{pts\:gmtime\:0\:%H\\\:%M\\\:%S}'
  • It went wrong: [Parsed_drawtext_0 @ 0x7fe6e840fd40] Could not load font "%M\": cannot open resource and [AVFilterGraph @ 0x7fe6e8708020] Error initializing filter 'drawtext' with args 'fontfile ***' – Wayne Chen Jul 13 '17 at 8:19
  • I'm on Windows. You probably are using the bash shell. You can try skipping the slashes between H M and S. – Gyan Jul 13 '17 at 8:22
  • Yeah, you are right! On macOS use this: text='timestamp \: %{pts\:gmtime\:0\:%H %M %S}', It seems that \: between H M and S is not allowed. So the ":" has not escaped. I'm wondering how to escape ":". Thanks a lot! – Wayne Chen Jul 13 '17 at 8:46

Do

In order to draw Timestamp: 01:25., you should specify this one to (feed) ffmpeg:

drawtext = text = 'Timestamp\: %{pts\:gmtime\:0\:%M\\\:%S}.'

Don't

If you specify this one to (feed) ffmpeg:

drawtext = text = '%{pts\:gmtime\:0\:%M\\:%S}'

, it gives Unterminated %{} near '{pts:gmtime:0:%M\' error.

But in bash

But if you're using bash-like shell and a weak quote, "......", to feed it,

  1. \\ is escaped to \, and

  2. \: is not escaped but remains without any changes because \: is not an escape sequence.

So it should be:

-filter_complex "drawtext = text = '%{pts\:gmtime\:0\:%M\\\\\:%S}'"

i.e. bash's "\\\\\:" for ffmpeg's \\\: for getting a single character : displayed.

Note that

If you only want to apply one or more filters to one video stream (e.g, drawtext), you can use -vf instead of using --filter_complex. The latter is reserved for applying filters on multiple streams.

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