iMX6 Gstreamer-1.0 playback framerate for encoded and multiplexed video

[alexanderkhudos]

In Gstreamer-0.10 the pipeline

gst-launch tvsrc ! queue ! deinterlace mode=1 ! vpuenc bitrate=5000000 ! matroskamux ! filesink location=./test.mp4

produces MPEG-4 file which could be played with

gst-launch filesrc location=./test.mp4 typefind=true ! aiurdemux ! queue ! vpudec ! imxv4l2sink

In Gstreamer-1.0 the equivalent pipeline

gst-launch-1.0  imxv4l2videosrc device=/dev/video0 ! deinterlace ! imxipuvideotransform ! imxvpuenc_h264 bitrate=5000 ! avimux ! filesink location=/tmp/test.mp4

produces MPEG-4 file with the framerate of 30 for both PAL and NTSC video inputs. Also, an attempt to play it with the pipeline

gst-launch-1.0 filesrc location=/tmp/test.mp4 do-timestamp=true typefind=true ! avidemux ! queue ! imxvpudec ! queue ! imxg2dvideosink

produces the following result:

Setting pipeline to PAUSED ...

[INFO]  Product Info: i.MX6Q/D/S

Pipeline is PREROLLING ...

ERROR: from element /GstPipeline:pipeline0/GstFileSrc:filesrc0: Internal data flow error.

Additional debug info:

/opt/oe-toradex/build/out-glibc/work/armv7at2hf-vfp-neon-angstrom-linux-gnueabi/gstreamer1.0/1.4.5-r0/gstreamer-1.4.5/libs/gst/base/gstbasesrc.c(2933): gst_base_src_loop (): /GstPipeline:pipeline0/GstFileSrc:filesrc0:

streaming task paused, reason not-negotiated (-4)

ERROR: pipeline doesn't want to preroll.

Setting pipeline to NULL ...

Freeing pipeline ...

Still, the same file can be played with

gst-launch-1.0 playbin uri=file:///tmp/test.mp4 video-sink="imxg2dvideosink"

So, my 2 questions are:

1. How can I set the correct framerate in the encoded .mp4 files?

2. How to create a pipeline equivalent to what playbin creates?

[Yuri]

Hello,

  Please refer to section 7.3 (Multimedia use cases) of "i.MX_Linux_User's_Guide.pdf"

regarding Gstreamer usage.

http://www.nxp.com/webapp/Download?colCode=L3.14.52_1.1.0_LINUX_DOCS&Parent_nodeId=13376994810717061...

Have a great day,
Yuri

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[alexanderkhudos]

Hello Yuri,

I have downloaded and built FSL plugins. I was able to build a working playback pipeline, but these plugins created more problems for me than resolved.

1. Recording using imxv4l2src is always set at 30fps. Not good for PAL signals.

2. If I record PAL video using 'imxv4l2videosrc fps-n=25’, playback still happens at 30 fps, but the file can be played with VLC at 25 fps.

3. Example playback pipelines using aiurdemux (7.3.1.2, 7.3.1.3) don't work for me. I have tried them on both files created by gstreamer, and downloaded from the web (sintel mp4 trailer).The same pipeline using matroskademux works OK. In Gstreamer-0.10 I did not have aiurdemux problems.

Pipeline

gst-launch-1.0 filesrc location=/tmp/test.mp4 ! matroskademux ! queue ! vpudec ! queue ! imxv4l2sink

works.

Pipeline

gst-launch-1.0 filesrc location=/tmp/test.mp4 ! aiurdemux ! queue ! vpudec ! queue ! imxv4l2sink

resulted in the following errors:

(gst-launch-1.0:1327): GStreamer-CRITICAL **: gst_element_class_add_pad_template: assertion 'GST_IS_PAD_TEMPLATE (templ)' failed

(gst-launch-1.0:1327): GStreamer-CRITICAL **: gst_pad_new_from_template: assertion 'GST_IS_PAD_TEMPLATE (templ)' failed

(gst-launch-1.0:1327): GStreamer-CRITICAL **: gst_pad_set_activate_function_full: assertion 'GST_IS_PAD (pad)' failed

(gst-launch-1.0:1327): GStreamer-CRITICAL **: gst_pad_set_activatemode_function_full: assertion 'GST_IS_PAD (pad)' failed

(gst-launch-1.0:1327): GStreamer-CRITICAL **: gst_pad_set_chain_function_full: assertion 'GST_IS_PAD (pad)' failed

(gst-launch-1.0:1327): GStreamer-CRITICAL **: gst_pad_set_event_function_full: assertion 'GST_IS_PAD (pad)' failed

(gst-launch-1.0:1327): GStreamer-CRITICAL **: gst_element_add_pad: assertion 'GST_IS_PAD (pad)' failed

[INFO]  Product Info: i.MX6Q/D/S

====== IMXV4L2SINK: 4.0.8 build on Jan  4 2016 10:37:23. ======

0:00:00.169867934  1327  0x1bfb360 ERROR           GST_PIPELINE grammar.y:616:gst_parse_perform_link: could not link filesrc0 to aiurdemux0

WARNING: erroneous pipeline: could not link filesrc0 to aiurdemux0

Best Regards,

Alexander

[Yuri]

Hello,

looks like You are right : imxv4l2videosrc frame rate issue · Issue #72 · Freescale/gstreamer-imx · GitHub 

Regards,

Yuri.