[FFmpeg-user] Copy from mjpeg USB camera stream to file

Aviv Hurvitz aviv.hurvitz at gmail.com
Wed Jul 26 09:19:42 EEST 2017


Well you are absolutely right. I was in low light. When working in full
light I got to 30 fps.

Thank you Moritz!

On Wed, Jul 26, 2017 at 2:02 AM, Moritz Barsnick <barsnick at gmx.net> wrote:

> On Wed, Jul 26, 2017 at 01:21:36 +0300, Aviv Hurvitz wrote:
>
> > I want to copy the original stream without any transcoding or
> > processing.
>
> Please explain your definition of processing. That's what ffmpeg does.
>
> > frame=   56 fps=8.0 q=-1.0 Lsize=    4470kB time=00:00:06.89
> > bitrate=5306.9kbits/s speed=0.989x
> > video:4455kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
> > muxing overhead: 0.343590%
> >
> > Note on the last line my fps=8.0 while the input is 30 fps. How can I fix
> > this?
>
> Hmm, on the other hand, "speed=0.989x" indicates that ffmpeg appears to
> be encoding in real time. Perhaps your camera is only delivering 8 fps,
> despite the setting. Are you operating in very low light? (Sorry, I
> know very little about dshow and how it interacts with cameras. I think
> I recall that cameras under Linux/V4L could expose the same behavior.)
>
> Moritz
> _______________________________________________
> ffmpeg-user mailing list
> ffmpeg-user at ffmpeg.org
> http://ffmpeg.org/mailman/listinfo/ffmpeg-user
>
> To unsubscribe, visit link above, or email
> ffmpeg-user-request at ffmpeg.org with subject "unsubscribe".


More information about the ffmpeg-user mailing list