Capture from UVC and convert to h264 on RPi

[Damien Picard]

Hi !

After having set up gstreamer 1.10.4 on a Debian Stretch / RPi / armhf, I'm trying to use

OpenMax to encode a MJPEG video from a UVC webcam.

I try using this command :

gst-launch-1.0 -vv -e v4l2src device=/dev/video0  ! "image/jpeg,width=640,height=480" ! queue ! jpegdec ! videoconvert ! omxh264enc ! matroskamux ! filesink location=videotestsrc.mkv

And I get this error :

Définition du pipeline à PAUSED...

Le pipeline est actif et n’a pas besoin de phase PREROLL…

Passage du pipeline à la phase PLAYING…

New clock: GstSystemClock

/GstPipeline:pipeline0/GstV4l2Src:v4l2src0.GstPad:src: caps = image/jpeg, width=(int)640, height=(int)480, framerate=(fraction)61612/513, pixel-aspect-ratio=(fraction)1/1, colorimetry=(string)2:4:7:1

/GstPipeline:pipeline0/GstCapsFilter:capsfilter0.GstPad:src: caps = image/jpeg, width=(int)640, height=(int)480, framerate=(fraction)61612/513, pixel-aspect-ratio=(fraction)1/1, colorimetry=(string)2:4:7:1

/GstPipeline:pipeline0/GstQueue:queue0.GstPad:src: caps = image/jpeg, width=(int)640, height=(int)480, framerate=(fraction)61612/513, pixel-aspect-ratio=(fraction)1/1, colorimetry=(string)2:4:7:1

/GstPipeline:pipeline0/GstJpegDec:jpegdec0.GstPad:sink: caps = image/jpeg, width=(int)640, height=(int)480, framerate=(fraction)61612/513, pixel-aspect-ratio=(fraction)1/1, colorimetry=(string)2:4:7:1

/GstPipeline:pipeline0/GstQueue:queue0.GstPad:sink: caps = image/jpeg, width=(int)640, height=(int)480, framerate=(fraction)61612/513, pixel-aspect-ratio=(fraction)1/1, colorimetry=(string)2:4:7:1

/GstPipeline:pipeline0/GstCapsFilter:capsfilter0.GstPad:sink: caps = image/jpeg, width=(int)640, height=(int)480, framerate=(fraction)61612/513, pixel-aspect-ratio=(fraction)1/1, colorimetry=(string)2:4:7:1

/GstPipeline:pipeline0/GstJpegDec:jpegdec0.GstPad:src: caps = video/x-raw, format=(string)I420, width=(int)640, height=(int)480, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1, chroma-site=(string)jpeg, colorimetry=(string)1:4:0:0, framerate=(fraction)61612/513

/GstPipeline:pipeline0/GstVideoConvert:videoconvert0.GstPad:src: caps = video/x-raw, format=(string)I420, width=(int)640, height=(int)480, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1, chroma-site=(string)jpeg, colorimetry=(string)1:4:0:0, framerate=(fraction)61612/513

/GstPipeline:pipeline0/GstOMXH264Enc-omxh264enc:omxh264enc-omxh264enc0.GstPad:sink: caps = video/x-raw, format=(string)I420, width=(int)640, height=(int)480, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1, chroma-site=(string)jpeg, colorimetry=(string)1:4:0:0, framerate=(fraction)61612/513

/GstPipeline:pipeline0/GstVideoConvert:videoconvert0.GstPad:sink: caps = video/x-raw, format=(string)I420, width=(int)640, height=(int)480, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1, chroma-site=(string)jpeg, colorimetry=(string)1:4:0:0, framerate=(fraction)61612/513

/GstPipeline:pipeline0/GstOMXH264Enc-omxh264enc:omxh264enc-omxh264enc0.GstPad:src: caps = video/x-h264, stream-format=(string)byte-stream, alignment=(string)au, profile=(string)high, level=(string)4, width=(int)640, height=(int)480, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)61612/513

ERREUR : de l’élément /GstPipeline:pipeline0/GstOMXH264Enc-omxh264enc:omxh264enc-omxh264enc0 : Internal data stream error.

Information de débogage supplémentaire :

gstomxvideoenc.c(843): gst_omx_video_enc_loop (): /GstPipeline:pipeline0/GstOMXH264Enc-omxh264enc:omxh264enc-omxh264enc0:

stream stopped, reason not-negotiated

EOS à la fermeture est activé -- attente d’EOS après erreur

Attente d’EOS.

/GstPipeline:pipeline0/GstMatroskaMux:matroskamux0.GstPad:src: caps = video/x-matroska

/GstPipeline:pipeline0/GstFileSink:filesink0.GstPad:sink: caps = video/x-matroska

^[[A^Chandling interrupt.

Interruption : arrêt du pipeline…

Interruption lors de l’attende d’EOS - arrêt du pipeline…

Execution ended after 0:00:50.361774870

Définition du pipeline à PAUSED...

Définition du pipeline à READY (prêt)…

Définition du pipeline à NULL…

Libération du pipeline…

But, when I use x264enc, it works :

Définition du pipeline à PAUSED...

Le pipeline est actif et n’a pas besoin de phase PREROLL…

Passage du pipeline à la phase PLAYING…

New clock: GstSystemClock

/GstPipeline:pipeline0/GstV4l2Src:v4l2src0.GstPad:src: caps = image/jpeg, width=(int)640, height=(int)480, framerate=(fraction)61612/513, pixel-aspect-ratio=(fraction)1/1, colorimetry=(string)2:4:7:1

/GstPipeline:pipeline0/GstCapsFilter:capsfilter0.GstPad:src: caps = image/jpeg, width=(int)640, height=(int)480, framerate=(fraction)61612/513, pixel-aspect-ratio=(fraction)1/1, colorimetry=(string)2:4:7:1

/GstPipeline:pipeline0/GstQueue:queue0.GstPad:src: caps = image/jpeg, width=(int)640, height=(int)480, framerate=(fraction)61612/513, pixel-aspect-ratio=(fraction)1/1, colorimetry=(string)2:4:7:1

/GstPipeline:pipeline0/GstJpegDec:jpegdec0.GstPad:sink: caps = image/jpeg, width=(int)640, height=(int)480, framerate=(fraction)61612/513, pixel-aspect-ratio=(fraction)1/1, colorimetry=(string)2:4:7:1

/GstPipeline:pipeline0/GstQueue:queue0.GstPad:sink: caps = image/jpeg, width=(int)640, height=(int)480, framerate=(fraction)61612/513, pixel-aspect-ratio=(fraction)1/1, colorimetry=(string)2:4:7:1

/GstPipeline:pipeline0/GstCapsFilter:capsfilter0.GstPad:sink: caps = image/jpeg, width=(int)640, height=(int)480, framerate=(fraction)61612/513, pixel-aspect-ratio=(fraction)1/1, colorimetry=(string)2:4:7:1

/GstPipeline:pipeline0/GstJpegDec:jpegdec0.GstPad:src: caps = video/x-raw, format=(string)I420, width=(int)640, height=(int)480, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1, chroma-site=(string)jpeg, colorimetry=(string)1:4:0:0, framerate=(fraction)61612/513

/GstPipeline:pipeline0/GstVideoConvert:videoconvert0.GstPad:src: caps = video/x-raw, format=(string)I420, width=(int)640, height=(int)480, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1, chroma-site=(string)jpeg, colorimetry=(string)1:4:0:0, framerate=(fraction)61612/513

/GstPipeline:pipeline0/GstOMXH264Enc-omxh264enc:omxh264enc-omxh264enc0.GstPad:sink: caps = video/x-raw, format=(string)I420, width=(int)640, height=(int)480, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1, chroma-site=(string)jpeg, colorimetry=(string)1:4:0:0, framerate=(fraction)61612/513

/GstPipeline:pipeline0/GstVideoConvert:videoconvert0.GstPad:sink: caps = video/x-raw, format=(string)I420, width=(int)640, height=(int)480, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1, chroma-site=(string)jpeg, colorimetry=(string)1:4:0:0, framerate=(fraction)61612/513

/GstPipeline:pipeline0/GstOMXH264Enc-omxh264enc:omxh264enc-omxh264enc0.GstPad:src: caps = video/x-h264, stream-format=(string)byte-stream, alignment=(string)au, profile=(string)high, level=(string)4, width=(int)640, height=(int)480, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)61612/513

ERREUR : de l’élément /GstPipeline:pipeline0/GstOMXH264Enc-omxh264enc:omxh264enc-omxh264enc0 : Internal data stream error.

Information de débogage supplémentaire :

gstomxvideoenc.c(843): gst_omx_video_enc_loop (): /GstPipeline:pipeline0/GstOMXH264Enc-omxh264enc:omxh264enc-omxh264enc0:

stream stopped, reason not-negotiated

EOS à la fermeture est activé -- attente d’EOS après erreur

Attente d’EOS.

/GstPipeline:pipeline0/GstMatroskaMux:matroskamux0.GstPad:src: caps = video/x-matroska

/GstPipeline:pipeline0/GstFileSink:filesink0.GstPad:sink: caps = video/x-matroska

^[[A^Chandling interrupt.

Interruption : arrêt du pipeline…

Interruption lors de l’attende d’EOS - arrêt du pipeline…

Execution ended after 0:00:50.361774870

Définition du pipeline à PAUSED...

Définition du pipeline à READY (prêt)…

Définition du pipeline à NULL…

Libération du pipeline…

So I think there is something wrong in the way I use omxh264enc, but I can't find what. FYI, I build gst-omx from source code (https://gstreamer.freedesktop.org/src/gst-omx/gst-omx-1.10.4.tar.xz)

Thank you in advance.

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[Nicolas Dufresne-5]

Le mercredi 15 mars 2017 à 21:07 +0100, Damien Picard a écrit :
> I try using this command :
> gst-launch-1.0 -vv -e v4l2src device=/dev/video0  !
> "image/jpeg,width=640,height=480" ! queue ! jpegdec ! videoconvert !
> omxh264enc ! matroskamux ! filesink location=videotestsrc.mkv

You need h264parse between omxh264enc and matroskamux. The reason is
that omxh264enc produce byte-stream format, but matroska need AVC.
h264parse will convert for you. x264enc can produce both formats.

Nicolas
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[Damien Picard]

It works ! Thank you very much.

2017-03-16 2:03 GMT+01:00 Nicolas Dufresne <[hidden email]>:

Le mercredi 15 mars 2017 à 21:07 +0100, Damien Picard a écrit :
> I try using this command :
> gst-launch-1.0 -vv -e v4l2src device=/dev/video0  !
> "image/jpeg,width=640,height=480" ! queue ! jpegdec ! videoconvert !
> omxh264enc ! matroskamux ! filesink location=videotestsrc.mkv

You need h264parse between omxh264enc and matroskamux. The reason is
that omxh264enc produce byte-stream format, but matroska need AVC.
h264parse will convert for you. x264enc can produce both formats.

Nicolas
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