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Are the recordings of a GoPro Hero 3 camera at 60 fps with constant or variable frame rate? How can I check the corresponding mp4 file for constant or variable frame rate?

Here is the output of the ffmpeg -i command:

Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/media/102GOPRO/GOPR0333.MP4':
  Metadata:
    major_brand     : avc1
    minor_version   : 0
    compatible_brands: avc1isom
    creation_time   : 2019-04-16 13:18:14
  Duration: 00:19:53.73, start: 0.000000, bitrate: 15122 kb/s
    Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuvj420p(pc, bt709), 1280x720 [SAR 1:1 DAR 16:9], 14982 kb/s, 59.94 fps, 59.94 tbr, 60k tbn, 119.88 tbc (default)
    Metadata:
      creation_time   : 2019-04-16 13:18:14
      handler_name    :  GoPro AVC
      encoder         : GoPro AVC encoder
      timecode        : 13:17:26:44
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 127 kb/s (default)
    Metadata:
      creation_time   : 2019-04-16 13:18:14
      handler_name    :  GoPro AAC
      timecode        : 13:17:26:44
    Stream #0:2(eng): Data: none (tmcd / 0x64636D74) (default)
    Metadata:
      creation_time   : 2019-04-16 13:18:14
      timecode        : 13:17:26:44

closed as off-topic by Philip Kendall, mattdm, scottbb, Tetsujin, xiota Jun 17 at 18:13

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "This question is about video in a context that is not likely to be relevant to still photography." – Philip Kendall, mattdm, scottbb, Tetsujin, xiota
If this question can be reworded to fit the rules in the help center, please edit the question.

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    I vote to close this question because it is a video question and not a photo question. It should be moved to video.stackexchange – LuZel Jun 17 at 13:39
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The user manual of the GoPro Hero 3 doesn't mention anything about a variable frame rate. Based on the manual, I'd assume that the 720p video is 60fps, constant.

To check the frame rate of a video file you can use the free command line tool ffmpeg like this:

ffmpeg -i <filename>
  • I have added the output of the command in my post. Is it constant frame rate? – machinery Jun 17 at 11:27
  • @machinery yes it is. The relevant part is 59.94 fps in the video track details. This is the NTSC standard framerate. (en.wikipedia.org/wiki/NTSC#Lines_and_refresh_rate) – vide Jun 17 at 11:40
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    Please try to resist the temptation to answer off-topic questions - it gives people the [unfortunately now correct] impression they can ask anything & get an answer. – Tetsujin Jun 17 at 17:47
  • @Tetsujin My bad. Didn't realize that the question is off-topic. – vide Jun 17 at 19:04

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