[FFmpeg-user] C920 h264 Problem

Canberk Demirsoy (Alumni) cdemirsoy at sabanciuniv.edu
Thu Jan 26 14:36:07 EET 2017


Hi

So you say that i actually get h264 stream and without encoding or decoding
saving it? So if it is that way i have nothing to do but in report there
are some parts about  YUV. I need best of that webcam in regards of
hardware acceleration and quality.

Regards


*Canberk Demirsoy*

B.Sc. Electrical Engineering, Sabanc─▒ University
M.Sc. Computer Engineering, Munich Technical University



On Thu, Jan 26, 2017 at 11:43 AM, Kieran O Leary <kieran.o.leary at gmail.com>
wrote:

> Hi,
>
> On Thu, Jan 26, 2017 at 10:23 AM, Canberk Demirsoy (Alumni) <
> cdemirsoy at sabanciuniv.edu> wrote:
>
> > Hi, i need input codec as h264 rather than yuvj420 because i am using
> > raspberry pi and c920 webcam so i need to handle encoding with onboard
> > encoder of c920 to make things easier. Yes my output is h264 but i also
> > need input as h264.
> >
> >
>
> yuvj420 is not a codec, it is the pixel format that a video codec uses. It
> is saying that your H264 encoding is:
> yuv - Using the YUV colour space
> j - using full, rather than broadcast range
> 420 - using 4:2:0 chroma subsampling
>
> I can't really help any further but hopefully someone more knowledgeable
> can assist you.  According to this, your input is h264:
>
> Input #0, video4linux2,v4l2, from '/dev/video0':
>   Duration: N/A, start: 2409.495782, bitrate: N/A
>     Stream #0:0, 8, 1/1000000: Video: h264 (Constrained Baseline), 1
> reference frame, yuvj420p(pc, progressive, left), 1920x1080 (1920x1088)
> [SAR 1:1 DAR 16:9], 0/1, -3 kb/s, 20 fps, 20 tbr, 1000k tbn, 40 tbc
>
>  I'm not sure if some other configuration is required for ffmpeg to be able
> to use hardware acceleration from a webcam, which sounds like  your intent.
>
> -Kieran.
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