Capturing jpegs from an h264 stream

[Nicolas Dufresne]

Le mardi 04 juin 2013 à 15:37 +0100, Alex Hewson a écrit :

> On 04/06/2013 14:32, Wes Miller wrote:
> > Ummm....  I haven't (can't) try this as I have no Raspberry Pi, but does this
> > actually work?
> >
> >      raspivid -n -t 1000000 -vf -b 2000000 -fps 25 -o - |  \
> >      gst-launch-1.0 fdsrc fd=0 ! decodebin ! videorate !
> >      video/x-raw,framerate=1/1 ! jpegenc ! multifilesink
> > location=img_%03d.jpeg
> >


This pipeline should work if the source can be streamed. What's the
transport being used by raspivid ? As a reference, I took you pipeline
and I made it work this way:


gst-launch-1.0 videotestsrc ! x264enc tune=zero-latency byte-stream=1 ! mpegtsmux ! fdsink fd=1 | \
gst-launch-1.0 -e fdsrc fd=0 ! decodebin ! jpegenc ! multifilesink location=img_%03d.jpeg


In this example I use MPEG Transport Stream. I also got it to work with
avimux, but not with qtmux as it's not streamable format (not without
configuration). In the case there is no transport (H264 byte-stream), I
could make it work using h264element, or simply setting caps after the
fdsrc:


gst-launch-1.0 videotestsrc ! x264enc tune=zero-latency byte-stream=1 ! fdsink fd=1 | \
gst-launch-1.0 -e fdsrc fd=0 ! h264parse ! decodebin ! jpegenc ! multifilesink location=img_%03d.jpeg

cheers,
Nicolas
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