Framerate issues

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Framerate issues

Calvin Arndt
It is clearly apparent to me I don't understand something going on
here!

I clearly select an output framerate of 7fps.
My camera's set to limit each connection to 7fps (and I have verified
it is doing so).
The camera I am using is a high end AXIS quite capable of 60fps.
Resultant videos are the full 3600 seconds, but they play in 900
seconds!
Verified via time time stamp on the images and vlc's playtime.
Why is fps=2.0? Totally not what I selected, nor what is provided by
camera.
Why is drop=1320. The machine doing this is quite capable of the full
framerate.
What am I missing?

Thanks in advance


ffmpeg -i http://192.168.2.1:9080/mjpg/video.mjpg -r 7 -t 3600
recording.avi
ffmpeg version 2.8.15-0ubuntu0.16.04.1 Copyright (c) 2000-2018 the
FFmpeg developers
   built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.10) 20160609
   configuration: --prefix=/usr --extra-version=0ubuntu0.16.04.1
--build-suffix=-ffmpeg --toolchain=hardened
--libdir=/usr/lib/x86_64-linux-gnu
--incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl
--enable-shared --disable-stripping --disable-decoder=libopenjpeg
--disable-decoder=libschroedinger --enable-avresample --enable-avisynth
--enable-gnutls --enable-ladspa --enable-libass --enable-libbluray
--enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite
--enable-libfontconfig --enable-libfreetype --enable-libfribidi
--enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame
--enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp
--enable-libschroedinger --enable-libshine --enable-libsnappy
--enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora
--enable-libtwolame --enable-libvorbis --enable-libvpx
--enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid
--enable-libzvbi --enable-openal --enable-opengl --enable-x11grab
--enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r
--enable-libx264 --enable-libopencv
   libavutil      54. 31.100 / 54. 31.100
   libavcodec     56. 60.100 / 56. 60.100
   libavformat    56. 40.101 / 56. 40.101
   libavdevice    56.  4.100 / 56.  4.100
   libavfilter     5. 40.101 /  5. 40.101
   libavresample   2.  1.  0 /  2.  1.  0
   libswscale      3.  1.101 /  3.  1.101
   libswresample   1.  2.101 /  1.  2.101
   libpostproc    53.  3.100 / 53.  3.100
[mjpeg @ 0x11cd0e0] ignoring invalid SAR: 10/11
[mjpeg @ 0x11cd0e0] Changeing bps to 8
Input #0, mjpeg, from 'http://192.168.2.1:9080/mjpg/video.mjpg':
   Duration: N/A, bitrate: N/A
     Stream #0:0: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown),
720x480, 25 tbr, 1200k tbn, 25 tbc
[swscaler @ 0x1216b40] deprecated pixel format used, make sure you did
set range correctly
Output #0, avi, to 'recording.avi':
   Metadata:
     ISFT            : Lavf56.40.101
     Stream #0:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 720x480,
q=2-31, 200 kb/s, 7 fps, 7 tbn, 7 tbc
     Metadata:
       encoder         : Lavc56.60.100 mpeg4
Stream mapping:
   Stream #0:0 -> #0:0 (mjpeg (native) -> mpeg4 (native))
Press [q] to stop, [?] for help
frame=  515 fps=2.0 q=20.7 Lsize=    2069kB time=00:01:13.57 bitrate=
230.3kbits/s dup=0 drop=1320
video:2051kB audio:0kB subtitle:0kB other streams:0kB global
headers:0kB muxing overhead: 0.871691%

--
Calvin


--
  Calvin Arndt
(217) 377-2979
[hidden email]
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Re: Framerate issues

Paul B Mahol
On 10/30/18, Calvin Arndt <[hidden email]> wrote:

> It is clearly apparent to me I don't understand something going on
> here!
>
> I clearly select an output framerate of 7fps.
> My camera's set to limit each connection to 7fps (and I have verified
> it is doing so).
> The camera I am using is a high end AXIS quite capable of 60fps.
> Resultant videos are the full 3600 seconds, but they play in 900
> seconds!
> Verified via time time stamp on the images and vlc's playtime.
> Why is fps=2.0? Totally not what I selected, nor what is provided by
> camera.
> Why is drop=1320. The machine doing this is quite capable of the full
> framerate.
> What am I missing?
>

Perhaps you need "-framerate 7" before -i ?

> Thanks in advance
>
>
> ffmpeg -i http://192.168.2.1:9080/mjpg/video.mjpg -r 7 -t 3600
> recording.avi
> ffmpeg version 2.8.15-0ubuntu0.16.04.1 Copyright (c) 2000-2018 the
> FFmpeg developers
>    built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.10) 20160609
>    configuration: --prefix=/usr --extra-version=0ubuntu0.16.04.1
> --build-suffix=-ffmpeg --toolchain=hardened
> --libdir=/usr/lib/x86_64-linux-gnu
> --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl
> --enable-shared --disable-stripping --disable-decoder=libopenjpeg
> --disable-decoder=libschroedinger --enable-avresample --enable-avisynth
> --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray
> --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite
> --enable-libfontconfig --enable-libfreetype --enable-libfribidi
> --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame
> --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp
> --enable-libschroedinger --enable-libshine --enable-libsnappy
> --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora
> --enable-libtwolame --enable-libvorbis --enable-libvpx
> --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid
> --enable-libzvbi --enable-openal --enable-opengl --enable-x11grab
> --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r
> --enable-libx264 --enable-libopencv
>    libavutil      54. 31.100 / 54. 31.100
>    libavcodec     56. 60.100 / 56. 60.100
>    libavformat    56. 40.101 / 56. 40.101
>    libavdevice    56.  4.100 / 56.  4.100
>    libavfilter     5. 40.101 /  5. 40.101
>    libavresample   2.  1.  0 /  2.  1.  0
>    libswscale      3.  1.101 /  3.  1.101
>    libswresample   1.  2.101 /  1.  2.101
>    libpostproc    53.  3.100 / 53.  3.100
> [mjpeg @ 0x11cd0e0] ignoring invalid SAR: 10/11
> [mjpeg @ 0x11cd0e0] Changeing bps to 8
> Input #0, mjpeg, from 'http://192.168.2.1:9080/mjpg/video.mjpg':
>    Duration: N/A, bitrate: N/A
>      Stream #0:0: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown),
> 720x480, 25 tbr, 1200k tbn, 25 tbc
> [swscaler @ 0x1216b40] deprecated pixel format used, make sure you did
> set range correctly
> Output #0, avi, to 'recording.avi':
>    Metadata:
>      ISFT            : Lavf56.40.101
>      Stream #0:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 720x480,
> q=2-31, 200 kb/s, 7 fps, 7 tbn, 7 tbc
>      Metadata:
>        encoder         : Lavc56.60.100 mpeg4
> Stream mapping:
>    Stream #0:0 -> #0:0 (mjpeg (native) -> mpeg4 (native))
> Press [q] to stop, [?] for help
> frame=  515 fps=2.0 q=20.7 Lsize=    2069kB time=00:01:13.57 bitrate=
> 230.3kbits/s dup=0 drop=1320
> video:2051kB audio:0kB subtitle:0kB other streams:0kB global
> headers:0kB muxing overhead: 0.871691%
>
> --
> Calvin
>
>
> --
>   Calvin Arndt
> (217) 377-2979
> [hidden email]
> _______________________________________________
> ffmpeg-user mailing list
> [hidden email]
> http://ffmpeg.org/mailman/listinfo/ffmpeg-user
>
> To unsubscribe, visit link above, or email
> [hidden email] with subject "unsubscribe".
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Re: Framerate issues

Moritz Barsnick
In reply to this post by Calvin Arndt
On Tue, Oct 30, 2018 at 08:01:59 -0500, Calvin Arndt wrote:
> I clearly select an output framerate of 7fps.
> My camera's set to limit each connection to 7fps (and I have verified
> it is doing so).

[...]

> Why is fps=2.0? Totally not what I selected, nor what is provided by
> camera.

It is a bit confusing if you don't understand what it means: It's the number of
output frames ffmpeg is *processing* per second - not the framerate of
the actual video.

> Why is drop=1320. The machine doing this is quite capable of the full
> framerate.

You are grabbing input video at (presumably) 25 fps, but requesting
ffmpeg to output 7 fps. ffmpeg achieves this by dropping frames -
therefore, drops are reported.

Indeed, 7 / 25 is approximately equal to 515 / (1230 + 515).

> Resultant videos are the full 3600 seconds, but they play in 900 seconds!

Presumably, your input MJPEG stream doesn't have any timestamps (or
ffmpeg is incapable of processing them. ffmpeg assumes 25 fps when it
really is 7, therefore the speedup. You could tell ffmpeg via an
*input* option what the actual input framerate is. Or you can tell
ffmpeg to use wallclock timestamps, i.e. use the arrival time.

> frame=  515 fps=2.0 q=20.7 Lsize=    2069kB time=00:01:13.57 bitrate=
> 230.3kbits/s dup=0 drop=1320

BTW, your ffmpeg is very old. Newer versions have a speed indicator,
possibly showing you that you are not capable of processing this video
in realtime (i.e. speed < 1.0x).

Cheers,
Moritz
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