error "no element "video"" when input is yuv

[Claire Mantel]

Hi Peter,
Ah ok oups, sorry I thought that video/x-h264 was the encoder…

So.. now I’ve tried the command line
gst-launch-1.0 filesrc location=/mnt/sdcard/testGSTPipelines/IRSeq_BUTIV_Davis1A_420_short.yuv ! \
video/x-raw,format=I420,width=640,height=512,framerate=25/1 \
! x264enc ! filesink location=test.mp4

(I don’t care about the settings of the encoder for now just would like to get the pipeline running)

And now I get the error

ERROR: from element /GstPipeline:pipeline0/GstFileSrc:filesrc0: Internal data flow error.
Additional debug info:
gstbasesrc.c(2865): gst_base_src_loop (): /GstPipeline:pipeline0/GstFileSrc:filesrc0:
streaming task paused, reason error (-5)
ERROR: pipeline doesn't want to preroll.

I get the same error if I try from an avi file (gst-launch-1.0 filesrc location=/mnt/sdcard/testGSTPipelines/IRSeq_BUTIV_Davis1A_420_short.avi ! \
x264enc ! filesink location=test.mp4)

I tried adding avimux and setting the output to avi but tthat doesn’t change anything.

Sorry for being such a newbie…


From: gstreamer-devel [mailto:gstreamer-devel-bounces at lists.freedesktop.org] On Behalf Of Peter Maersk-Moller
Sent: Monday, August 15, 2016 12:20 PM
To: Discussion of the development of and with GStreamer
Subject: Re: error "no element "video"" when input is yuv

Hi Claire.

On Mon, Aug 15, 2016 at 10:24 AM, Claire Mantel <clma at fotonik.dtu.dk<mailto:clma at fotonik.dtu.dk>> wrote:
Hey Alan,
Thanks for answering.
My aim is to encode the video yes.
Based on your answer I tried the following command line:
gst-launch-1.0 filesrc location=/mnt/sdcard/testGSTPipelines/IRSeq_BUTIV_Davis1A_420_short.yuv blocksize=491520 ! \
video/x-raw,format=i420,width=640,height=512,framerate=25/1 \
! video/x-h264 ! avimux ! queue ! filesink location=test.avi

The element 'video/x-raw,format=i420,width=640,height=512,framerate=25/1' and the element 'video/x-h264' are cap specifications or cap filters. They DO NOT change/encode/decode any data at all. You don't get encoded H.264 video by declaring that it is by some magical and mysterious way. You need to add an encoder element. Such element could be the x264enc element.

But I still get the same error.
I don’t get the first answer (“video/x-raw and video/x-h264 are incompatible”) as x264 is a video encoder…

No, you are mistaken. x264 is an encoder project which code GStreamer has used to based their H.264 encoder, the x264enc element, on. You have not included any encoder element at all in your pipeline. I'd suggest you include one.
Best Peter
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