The VideoLAN Forums

Posted: **08 May 2014 01:26**

Finally!

I've found solution to transcode my webcam source, here's the command:

cvlc --intf=dummy v4l2:///dev/video1 --noaudio --sout-mux-caching=6000 --sout '#transcode{vcodec=h264,venc=x264{preset=medium,tune=ssim,level=3,video_filter={select_every:2,1},profile=baseline,keyint=60,bframes=0}}:standard{mux=ts,access=http,dst=:8090/myStream.mp4}' -v 1

But i need some tweaking:

[0xb520e908] main encoder warning: option video_filter is unknown
[0xb520e908] main encoder warning: option deinterlace is unknown
x264 [info]: using cpu capabilities: MMX2 SSE2Fast SSSE3 Cache64 SlowCTZ SlowAtom
x264 [info]: profile Constrained Baseline, level 3.0

This message drops twice, by the way.

1. How to use video_filter? [http://mewiki.project357.com/wiki/X264_ ... lect_every]
Wanted to drop one per two or three frames.

Or shall i use other way to drop frames?

2. Do i need deinterlaced?

3. As far i as i know:

Code: Select all

x264 [warning]: MB rate (5152760) > level limit (40500)

I do not get it... Why this value is so big?

Regards!

Posted: **09 May 2014 10:56**

Ok, i end up with this:

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cvlc v4l2:///dev/video1 \
  --intf=dummy \
  --noaudio \
  --deinterlace 0 \
  --sout-x264-keyint 10 \
  --sout-x264-level 2.2 \
  --sout-x264-profile main \
  --sout-x264-preset slow \
  --sout-x264-tune psnr \
  --sout-transcode-vfilter rotate{angle=270} \
  --sout-transcode-venc x264 \
  --sout-transcode-vcodec h264 \
  --sout-standard-mux ts \
  --sout-standard-access http \
  --sout-standard-dst ":8090/myStream.mp4" \
  --sout '#transcode{}:std{}'
  
cvlc v4l2:///dev/video0 \
  --intf=dummy \
  --noaudio \
  --deinterlace 0 \
  --sout-x264-keyint 10 \
  --sout-x264-level 2.2 \
  --sout-x264-profile main \
  --sout-x264-preset slow \
  --sout-x264-tune psnr \
  --sout-transcode-vfilter rotate{angle=90} \
  --sout-transcode-venc x264 \
  --sout-transcode-vcodec h264 \
  --sout-standard-mux ts \
  --sout-standard-access http \
  --sout-standard-dst ":8089/myStream.mp4" \
  --sout '#transcode{}:std{}'

I did'n use:
Since it does not (?) change anything:

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  --sout-ffmpeg-bframes 0 \
  --no-sout-x264-cabac \
  --sout-x264-pass 0 \

This one is very (about twice!) cpu expensive:

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--sout-transcode-fps 10 \

I didn't know which one to use, so i resign of ssim for psnr since it is a bit lighter:

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--sout-x264-tune ssim \

I do not know how to use this:

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  --transform-type=270 \
  --video-filter "transform{true}" \
   --vfilter=transform \
  
  --mjpeg-fps 10 \
  --sout-transcode-fps 10 \

My questions, i'd like to ask:
1. Why less fps at transcode produces cpu stress? How to avoid it?
2. Which one x264-tune option to chose? Both cameras are in terrarium 'watching' family (of about 50) hissing cockroaches.
3. Is transform-type=270 lighter than --sout-transcode-vfilter rotate{angle=270}? which one should i use?
4. --sout '#transcode{}:std{}' is this correct?

Thanks in advance.

Posted: **17 May 2014 02:35**

The VideoLAN Forums

Webcam, vlc, transcoding and mp4 (or flv?)

Webcam, vlc, transcoding and mp4 (or flv?)

Re: Webcam, vlc, transcoding and mp4 (or flv?)

Re: Webcam, vlc, transcoding and mp4 (or flv?)