GStreamer i.MX6 Decoding

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GStreamer i.MX6 Decoding

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GStreamer i.MX6 Decoding

Video, bad performancegst-launch filesrc location=test.mp4 typefind=true ! aiurdemux ! vpudec ! mfw_v4lsink
Video, better performance

gst-launch filesrc location=sample.mp4 typefind=true ! aiurdemux ! queue max-size-time=0 ! vpudec ! mfw_v4lsink

# typefind=true allows to 'type find' the source file before negotiating

# max-size-time=0 indicates to ignore possible blocking issues

# In case of ASF files

gst-launch filesrc location=sample.asf typefind=true ! aiurdemux ! queue max-size-time=0 ! mfw_wmvdecoder ! mfw_v4lsink

Audiogst-launch filesrc location=sample.mp3  typefind=true ! beepdec ! audioconvert  ! 'audio/x-raw-int, channels=2' ! alsasink
Audio with visualizationgst-launch filesrc location=sample.mp3 typefind=true ! beepdec ! tee name=t ! queue ! audioconvert  ! 'audio/x-raw-int, channels=2' ! alsasink t. ! queue ! audioconvert ! goom ! autovideoconvert ! autovideosink
Video/Audio long version

gst-launch filesrc location=sample.avi typefind=true ! aiurdemux name=demux demux. ! queue max-size-buffers=0 max-size-time=0 ! vpudec ! mfw_v4lsink demux. ! queue max-size-buffers=0 max-size-time=0 ! beepdec ! audioconvert ! 'audio/x-raw-int, channels=2' ! alsasink

# queue properties, max-size-buffers=0 and max-size-time=0, allows a smoother playback; type 'gst-inspect queue' for more info

VA short versiongplay sample.avi
VA short versiongst-launch playbin2 uri=file://<full path to sample file>


Working on iMX6 target.

I am trying to play a video file using gst pipeline "gst-launch playbin2 uri=file://<full path to sample file>", video and audio is fine until when I try to use trick play mode to seek to stream forward/backward for about xx seconds. What I see in the  vpudec and aiurdemux gstreamer plugin is that some error states like "GST_FLOW_WRONG_STATE" are ignored during trick play handling i.e. in gst_vpudec_chain function and in aiurdemux_push_pad_buffer. Please let me know why these event types are ignored or the reason for it. Thank you.

Gautham, what is 'trick play mode'? Can you try seeking using gplay? Does the latter produce the same errros?


Hello, is beepdec a hardware decoder? If not, what hardware decoding can I use?

Thank you,


There is no audio hardware decoder on

Hi Fabio,

At one point I have seen:

aacdec.imx:  mfw_aacdecoder: aac audio decoder

However, I do not see this in the most recent 3.10.17 release on the MCIMX6Q-SDB board.

Can you help clarify why the mfw_aacdecoder is missing, and if this was in fact a hardware decoder?

Thank you,



All audio decoders are software-based. There is no audio hardware decoder block on

About the missing mfw_aacdecoder, maybe it is license related? Maybe someone at meta-fsl-arm would be in a better position to confirm about the missing plugin.

Version history
Last update:
‎09-28-2012 12:56 PM
Updated by: