GStreamer i.MX6 Decoding

[#1]

Video, bad performance	gst-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
Audio	gst-launch filesrc location=sample.mp3  typefind=true ! beepdec ! audioconvert  ! 'audio/x-raw-int, channels=2' ! alsasink
Audio with visualization	gst-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 version	gplay sample.avi
VA short version	gst-launch playbin2 uri=file://<full path to sample file>

[gauthamkanthara]

Hello,

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.

[LeonardoSandova]

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

Leo

[ryanerb]

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

Thank you,

Ryan

[fabio_estevam]

There is no audio hardware decoder on i.mx.

[ryanerb]

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,

Ryan

[fabio_estevam]

Ryan,

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

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.