[FFmpeg-user] Can I get some help converting .sec files?

Carl Eugen Hoyos ceffmpeg at gmail.com
Fri Aug 31 01:18:15 EEST 2018

2018-08-25 23:11 GMT+02:00, LH <drivebee at pm.me>:
> Hi, I have a Samsung security system which saves video in the .sec format
> which no other app can play. The Samsung SmartViewer app has developed
> issues and is no longer updated/supported so, as a result, I cannot play
> saved .sec files with it, either. So- I can save video but there is no way
> to watch it. However, I can convert these .sec files to mp4 with ffmpeg,
> using this command:
> ffmpeg -i (name of file).sec (name of final file).mp4
> It throws errors such as:

> [h264 @ 000000000057fb00] Invalid NAL unit 8, skipping.

The errors could in theory be fixed but this will probably only
be done if you can provide a sample with visible problems.

> [libx264 @ 0000000000516800] frame= 176 QP=25.50 NAL=2 Slice:B Poc:352 I:3
> P:485  SKIP:821  size=1220 bytes
> but it still works well enough that I can watch the video with any app that
> plays mp4. However, the video is sped up quite a bit so that it appears to
> be in fast motion.

You can use the input option "-r" to fix the speed of the output
video assuming the input is cfr.
If the input is not cfr, we will likely need more samples (with
actual content).

> I suppose it's the Samsung app that is doing this but
> since I can't watch it until I convert it, I don't know for sure. I figured
> out that it is about 3.3 times faster. I can convert the video and also slow
> it down to normal speed with the command:

> ffmpeg -i (name of file).sec -filter:v "setpts=3.3*PTS"  (name of final
> file).mp4

The setpts filter is of course also a possibility.

> but the video loses quality and horizontal lines appear in it.

Complete, uncut console output missing.
(works fine here)

Carl Eugen

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