Ffmpeg GoPro：获取每个帧的时间戳

我目前正在尝试从使用GoPro录制的MPEG-4文件中提取每个帧时间戳

我想知道摄像机捕捉到画面的准确时间，以便稍后将其与计算机视觉算法相结合

我知道输出帧速率是25 fps。 我使用ffmpeg和ffprobe以不同的方式提取了pts，但它们都显示了太完美的结果，我无法相信它们

每个帧/数据包都有一个精确的0.04秒的间隔（或3600秒的pts单位），这足够方便地匹配一个完美的25fps

到目前为止，我使用的命令有：

ffmpeg -i 3_96025.MP4  -an -vf showinfo %10d.png 2> res.txt

我也尝试过使用

ffmpeg -i 3_96025.MP4 **-copyts** -an -vf showinfo %10d.png 2> res.txt

但结果完全相同

我还尝试：

但是我得到的间隔也很完美

我很确定gopro不能以如此完美的方式维持25 fps。此外，我还记录了一个计时器，我可以看到每一帧都不完全匹配0.04秒的间隔。 那么有没有一种方法可以让我真正看到每一帧被捕获的时间呢？

以下是我使用ffmpeg获得的部分输出，以供参考：

frame=   42 fps= 26 q=0.0 size=N/A time=00:00:01.36 bitrate=N/A    
n:42 pts:151200 pts_time:1.68 pos:3232584 fmt:yuv420p sar:1/1 s:1280x960 i:P iskey:0 type:B checksum:6A83E942 plane_checksum:[1C859E55 79A4ED3E 28E25DA0]
[Parsed_showinfo_0 @ 0037dea0] n:43 pts:154800 pts_time:1.72 pos:3255334 fmt:yuv420p sar:1/1 s:1280x960 i:P iskey:0 type:B checksum:5736F4C1 plane_checksum:[ACAD00D0 06FFDE34 65FA15BD]
[Parsed_showinfo_0 @ 0037dea0] n:44 pts:158400 pts_time:1.76 pos:3083826 fmt:yuv420p sar:1/1 s:1280x960 i:P iskey:0 type:P checksum:9DD6B636 plane_checksum:[229400B3 7C0B52AF 75D162D4]
[Parsed_showinfo_0 @ 0037dea0] n:45 pts:162000 pts_time:1.8 pos:3531851 fmt:yuv420p sar:1/1 s:1280x960 i:P iskey:0 type:B checksum:2DA4E2B9 plane_checksum:[9C646B9D 16F45382 28B0239A]
[Parsed_showinfo_0 @ 0037dea0] n:46 pts:165600 pts_time:1.84 pos:3556346 fmt:yuv420p sar:1/1 s:1280x960 i:P iskey:0 type:B checksum:B4924AFE plane_checksum:[579EDD8F 94BC5C61 5B7F10FF]
[Parsed_showinfo_0 @ 0037dea0] n:47 pts:169200 pts_time:1.88 pos:3279065 fmt:yuv420p sar:1/1 s:1280x960 i:P iskey:0 type:I checksum:DBB23A0C plane_checksum:[321835C9 57E9C9FB 576B3A39]
[Parsed_showinfo_0 @ 0037dea0] n:48 pts:172800 pts_time:1.92 pos:3655246 fmt:yuv420p sar:1/1 s:1280x960 i:P iskey:0 type:B checksum:9BF3A47A plane_checksum:[4E17440B 3A059191 E394CECF]
[Parsed_showinfo_0 @ 0037dea0] n:49 pts:176400 pts_time:1.96 pos:3677897 fmt:yuv420p sar:1/1 s:1280x960 i:P iskey:0 type:B checksum:2A3167B4 plane_checksum:[78601136 0A6F8334 272ED33B]
[Parsed_showinfo_0 @ 0037dea0] n:50 pts:180000 pts_time:2 pos:3581296 fmt:yuv420p sar:1/1 s:1280x960 i:P iskey:0 type:P checksum:5A8C502E plane_checksum:[65A1FE60 0CEF07C3 F26149FC]
[Parsed_showinfo_0 @ 0037dea0] n:51 pts:183600 pts_time:2.04 pos:3773963 fmt:yuv420p sar:1/1 s:1280x960 i:P iskey:0 type:B checksum:90572E41 plane_checksum:[E9478643 B8BAE0E2 E1A7C6FE]
[Parsed_showinfo_0 @ 0037dea0] n:52 pts:187200 pts_time:2.08 pos:3797473 fmt:yuv420p sar:1/1 s:1280x960 i:P iskey:0 type:B checksum:2F206AB4 plane_checksum:[EB17F6AB 0AD1C78A E032AC61]
[Parsed_showinfo_0 @ 0037dea0] n:53 pts:190800 pts_time:2.12 pos:3700340 fmt:yuv420p sar:1/1 s:1280x960 i:P iskey:0 type:P checksum:9A91E693 plane_checksum:[72309E37 229C34FB 59A71361]
[Parsed_showinfo_0 @ 0037dea0] n:54 pts:194400 pts_time:2.16 pos:3897890 fmt:yuv420p sar:1/1 s:1280x960 i:P iskey:0 type:B checksum:BFCD3D1C plane_checksum:[13787B52 5F33F597 833ECC15]
[Parsed_showinfo_0 @ 0037dea0] n:55 pts:198000 pts_time:2.2 pos:3919440 fmt:yuv420p sar:1/1 s:1280x960 i:P iskey:0 type:B checksum:62C6ED26 plane_checksum:[E4053A80 4752E0B5 E78FD1E2]

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您正在寻找可以转换为Unix历元时间戳的时间戳吗？实际上，任何时间戳都适合。我只想能够将每一帧与一个精确的时刻联系起来，以便以后处理。是的，你做到了。我记录了一个计时器作为测试，两帧之间的时间在30到50毫秒之间变化。除此之外，我找不到精确定义视频t=0的方法，这意味着与我的另一帧相比，我无法真正参考图像sensors@jlengrand顺便说一句，这是个好主意！您是否最终找到了一种方法，可以获得精确的时间戳<10毫秒精度？@jlengrand您记录的是哪种类型的计时器？我试着在我的电脑上记录一个毫秒计数器，但后来我想起电脑屏幕的刷新率是60Hz，并且只能每1/60秒更新一次（）。你记录的是哪种类型的计时器，这样你就能看到毫秒级的更新？

frame=   42 fps= 26 q=0.0 size=N/A time=00:00:01.36 bitrate=N/A    
n:42 pts:151200 pts_time:1.68 pos:3232584 fmt:yuv420p sar:1/1 s:1280x960 i:P iskey:0 type:B checksum:6A83E942 plane_checksum:[1C859E55 79A4ED3E 28E25DA0]
[Parsed_showinfo_0 @ 0037dea0] n:43 pts:154800 pts_time:1.72 pos:3255334 fmt:yuv420p sar:1/1 s:1280x960 i:P iskey:0 type:B checksum:5736F4C1 plane_checksum:[ACAD00D0 06FFDE34 65FA15BD]
[Parsed_showinfo_0 @ 0037dea0] n:44 pts:158400 pts_time:1.76 pos:3083826 fmt:yuv420p sar:1/1 s:1280x960 i:P iskey:0 type:P checksum:9DD6B636 plane_checksum:[229400B3 7C0B52AF 75D162D4]
[Parsed_showinfo_0 @ 0037dea0] n:45 pts:162000 pts_time:1.8 pos:3531851 fmt:yuv420p sar:1/1 s:1280x960 i:P iskey:0 type:B checksum:2DA4E2B9 plane_checksum:[9C646B9D 16F45382 28B0239A]
[Parsed_showinfo_0 @ 0037dea0] n:46 pts:165600 pts_time:1.84 pos:3556346 fmt:yuv420p sar:1/1 s:1280x960 i:P iskey:0 type:B checksum:B4924AFE plane_checksum:[579EDD8F 94BC5C61 5B7F10FF]
[Parsed_showinfo_0 @ 0037dea0] n:47 pts:169200 pts_time:1.88 pos:3279065 fmt:yuv420p sar:1/1 s:1280x960 i:P iskey:0 type:I checksum:DBB23A0C plane_checksum:[321835C9 57E9C9FB 576B3A39]
[Parsed_showinfo_0 @ 0037dea0] n:48 pts:172800 pts_time:1.92 pos:3655246 fmt:yuv420p sar:1/1 s:1280x960 i:P iskey:0 type:B checksum:9BF3A47A plane_checksum:[4E17440B 3A059191 E394CECF]
[Parsed_showinfo_0 @ 0037dea0] n:49 pts:176400 pts_time:1.96 pos:3677897 fmt:yuv420p sar:1/1 s:1280x960 i:P iskey:0 type:B checksum:2A3167B4 plane_checksum:[78601136 0A6F8334 272ED33B]
[Parsed_showinfo_0 @ 0037dea0] n:50 pts:180000 pts_time:2 pos:3581296 fmt:yuv420p sar:1/1 s:1280x960 i:P iskey:0 type:P checksum:5A8C502E plane_checksum:[65A1FE60 0CEF07C3 F26149FC]
[Parsed_showinfo_0 @ 0037dea0] n:51 pts:183600 pts_time:2.04 pos:3773963 fmt:yuv420p sar:1/1 s:1280x960 i:P iskey:0 type:B checksum:90572E41 plane_checksum:[E9478643 B8BAE0E2 E1A7C6FE]
[Parsed_showinfo_0 @ 0037dea0] n:52 pts:187200 pts_time:2.08 pos:3797473 fmt:yuv420p sar:1/1 s:1280x960 i:P iskey:0 type:B checksum:2F206AB4 plane_checksum:[EB17F6AB 0AD1C78A E032AC61]
[Parsed_showinfo_0 @ 0037dea0] n:53 pts:190800 pts_time:2.12 pos:3700340 fmt:yuv420p sar:1/1 s:1280x960 i:P iskey:0 type:P checksum:9A91E693 plane_checksum:[72309E37 229C34FB 59A71361]
[Parsed_showinfo_0 @ 0037dea0] n:54 pts:194400 pts_time:2.16 pos:3897890 fmt:yuv420p sar:1/1 s:1280x960 i:P iskey:0 type:B checksum:BFCD3D1C plane_checksum:[13787B52 5F33F597 833ECC15]
[Parsed_showinfo_0 @ 0037dea0] n:55 pts:198000 pts_time:2.2 pos:3919440 fmt:yuv420p sar:1/1 s:1280x960 i:P iskey:0 type:B checksum:62C6ED26 plane_checksum:[E4053A80 4752E0B5 E78FD1E2]