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Today's Topics:
1. Strange frame rate (Harlan Daneker)
2. Re: Strange frame rate (rmbusy)
----------------------------------------------------------------------
Message: 1
Date: Wed, 3 Jan 2024 22:46:44 -0500
From: Harlan Daneker <[email protected]>
To: Motion discussion list <[email protected]>
Subject: [Motion-user] Strange frame rate
Message-ID:
<CAC1WkiQo1KhcXUa+mj-LOmyrOb2QKvY5OAQxSszr+LCR9=1...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
motion 4.6.0+git20231111-7b85a24 "Fedora 39"
Hi:
I was hoping somebody could explain this. I have some Lorex E841CA-E bullet
ip cameras. I have the *computer time and the camera time* displayed on the
videos, also visible when I use motion to stream_localhost at 1fps. The
camera uses ntp to set the time with the computer so they are synced.
If I set the frame rate on the camera and motion.conf at 25fps the camera
time keeps falling behind the computer time and the recorded videos jump
sometimes.
If I set the framerate on the camera at 25fps and the motion.conf at 30fps
the times sink almost perfectly and mediainfo says the videos are 28fps.
This seems to work well, but why?
mediainfo 20:24.mp4
General
Complete name : 20:24.mp4
Format : MPEG-4
Format profile : JVT
Codec ID : avc1 (isom/avc1)
File size : 3.06 MiB
Duration : 1 s 642 ms
Overall bit rate : 15.6 Mb/s
*Frame rate : 28.000 FPS*
Encoded date : 2024-01-04 01:24:50 UTC
Tagged date : 2024-01-04 01:24:50 UTC
Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : Constrained Baseline@L5
Format settings : 1 Ref Frames
Format settings, CABAC : No
Format settings, Reference frames : 1 frame
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 1 s 642 ms
Bit rate : 15.6 Mb/s
Maximum bit rate : 17.1 Mb/s
Width : 2 688 pixels
Height : 1 520 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
*Frame rate : 28.000 FPS*
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.137
Stream size : 3.06 MiB (100%)
Writing library : x264 core 164 r3108 31e19f9
Encoding settings : cabac=0 / ref=1 / deblock=0:0:0
/ analyse=0:0 / me=dia / subme=0 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=0 /
me_range=16 / chroma_me=1 / trellis=0 / 8x8dct=0 / cqm=0 / deadzone=21,11 /
fast_pskip=1 / chroma_qp_offset=0 / threads=9 / lookahead_threads=1 /
sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 /
constrained_intra=0 / bframes=0 / weightp=0 / keyint=250 / keyint_min=25 /
scenecut=0 / intra_refresh=0 / rc=crf / mbtree=0 / crf=23.0 / qcomp=0.60 /
qpmin=0 / qpmax=69 / qpstep=4 / ip_ratio=1.40 / aq=0
Encoded date : 2024-01-04 01:24:50 UTC
Tagged date : 2024-01-04 01:25:52 UTC
Codec configuration box
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Message: 2
Date: Wed, 3 Jan 2024 20:26:02 -0800
From: rmbusy <[email protected]>
To: Harlan Daneker <[email protected]>
Cc: Motion discussion list <[email protected]>
Subject: Re: [Motion-user] Strange frame rate
Message-ID: <[email protected]>
Content-Type: text/plain; charset="utf-8"; Format="flowed"
That's very interesting, as I have been seeing what sounds like the same
issue with some IP bullet style cameras, but I'm using snapshot mode (1
picture per second).? If I'm watching the motion live output with the
browser, things in the video will continually slow way down, then after
about 30 to 45 seconds, jump back to live, then repeat.? I thought it
was something to do with snapshot mode though.
--
Rob.
On 1/3/24 19:46, Harlan Daneker wrote:
> motion 4.6.0+git20231111-7b85a24?? "Fedora 39"
>
> Hi:
> I was hoping somebody could explain this. I have some Lorex E841CA-E
> bullet ip cameras. I have the /computer time and the camera time/
> displayed on the videos, also visible when I use motion to
> stream_localhost at 1fps. The camera uses ntp to set the time with the
> computer so they are synced.
>
> If I set the frame rate on the camera and motion.conf at 25fps the
> camera time keeps falling behind the computer time and the recorded
> videos jump sometimes.
> If I set the framerate on the camera at 25fps and the motion.conf at
> 30fps the times sink almost perfectly and mediainfo says the videos
> are 28fps. This seems to work well, but why?
>
>
> mediainfo 20:24.mp4
> General
> Complete name ? ? ? ? ? ? ? ? ? ? ? ? ? ?: 20:24.mp4
> Format ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? : MPEG-4
> Format profile ? ? ? ? ? ? ? ? ? ? ? ? ? : JVT
> Codec ID ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? : avc1 (isom/avc1)
> File size ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?: 3.06 MiB
> Duration ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? : 1 s 642 ms
> Overall bit rate ? ? ? ? ? ? ? ? ? ? ? ? : 15.6 Mb/s
> *Frame rate ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? : 28.000 FPS*
> Encoded date ? ? ? ? ? ? ? ? ? ? ? ? ? ? : 2024-01-04 01:24:50 UTC
> Tagged date ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?: 2024-01-04 01:24:50 UTC
>
> Video
> ID ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? : 1
> Format ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? : AVC
> Format/Info ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?: Advanced Video Codec
> Format profile ? ? ? ? ? ? ? ? ? ? ? ? ? : Constrained Baseline@L5
> Format settings ? ? ? ? ? ? ? ? ? ? ? ? ?: 1 Ref Frames
> Format settings, CABAC ? ? ? ? ? ? ? ? ? : No
> Format settings, Reference frames ? ? ? ?: 1 frame
> Codec ID ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? : avc1
> Codec ID/Info ? ? ? ? ? ? ? ? ? ? ? ? ? ?: Advanced Video Coding
> Duration ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? : 1 s 642 ms
> Bit rate ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? : 15.6 Mb/s
> Maximum bit rate ? ? ? ? ? ? ? ? ? ? ? ? : 17.1 Mb/s
> Width ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?: 2 688 pixels
> Height ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? : 1 520 pixels
> Display aspect ratio ? ? ? ? ? ? ? ? ? ? : 16:9
> Frame rate mode ? ? ? ? ? ? ? ? ? ? ? ? ?: Constant
> *Frame rate ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? : 28.000 FPS*
> Color space ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?: YUV
> Chroma subsampling ? ? ? ? ? ? ? ? ? ? ? : 4:2:0
> Bit depth ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?: 8 bits
> Scan type ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?: Progressive
> Bits/(Pixel*Frame) ? ? ? ? ? ? ? ? ? ? ? : 0.137
> Stream size ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?: 3.06 MiB (100%)
> Writing library ? ? ? ? ? ? ? ? ? ? ? ? ?: x264 core 164 r3108 31e19f9
> Encoding settings ? ? ? ? ? ? ? ? ? ? ? ?: cabac=0 / ref=1 /
> deblock=0:0:0 / analyse=0:0 / me=dia / subme=0 / psy=1 /
> psy_rd=1.00:0.00 / mixed_ref=0 / me_range=16 / chroma_me=1 / trellis=0
> / 8x8dct=0 / cqm=0 / deadzone=21,11 / fast_pskip=1 /
> chroma_qp_offset=0 / threads=9 / lookahead_threads=1 /
> sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0
> / constrained_intra=0 / bframes=0 / weightp=0 / keyint=250 /
> keyint_min=25 / scenecut=0 / intra_refresh=0 / rc=crf / mbtree=0 /
> crf=23.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / ip_ratio=1.40
> / aq=0
> Encoded date ? ? ? ? ? ? ? ? ? ? ? ? ? ? : 2024-01-04 01:24:50 UTC
> Tagged date ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?: 2024-01-04 01:25:52 UTC
> Codec configuration box
>
>
>
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