Dumping the pipeline elements into a image file # On target, run the pipeline $ export GST_DEBUG_DUMP_DOT_DIR=<folder where dot files are created> $ gst-launch playbin2 uri=file://${avi} $ # Move the .dot files to a host machine (scp, etc) # On Host dot <dot file> -Tpng -o out.png # dot command is part the the graphviz package Querying which elements are being used on a gst-launch command GST_DEBUG=GST_ELEMENT_FACTORY:3 gst-launch playbin2 uri=file://`pwd`/<media file> Interrupting a gst-launch process running in the background kill -INT $PID # where $PID is the process ID Using only SW codecs # Backup and remove $ find /usr/lib/gstreamer-0.10 -name "libmfw*" | grep -v sink | xargs tar cvf /libmfw_gst.tar $ find /usr/lib/gstreamer-0.10 -name "libmfw*" | grep -v sink | xargs rm # Run your pipeline. This time SW codecs are used $ gst-launch playbin2 uri=file://`pwd`/media_file # To 'install' FSL plugins again, just untar the file $ cd / && tar xvf libmfw_gst.tar && cd - # then run your pipeline. This time HW codecs are used $ gst-launch playbin2 uri=file://`pwd`/media_file

Video decoding gst-launch filesrc location=sample.mp4 ! qtdemux ! ffdec_h264 ! mfw_v4lsink Notes: On LTIB BSP 3.0.35_4.0.0, prep the package and apply the attached patch on top, then build. On Yocto, the easy way to add the gst-ffmpeg package is by adding these two lines on the conf/local.conf file: IMAGE_INSTALL_append = " gst-ffmpeg" LICENSE_FLAGS_WHITELIST = 'commercial'

Multiple-Display means video playback on multiple screens. In case playback needs to be in a unique screen, the mfw_isink element must be used and some pipelines examples can be found on this link: GStreamer iMX6 Multi-Overlay. Number of Displays Display type Kernel parameters Pipelines # Set these shells variables before running the pipelines alias gl=gst-launch SINK_1="\"mfw_v4lsink device=/dev/video17\"" SINK_2="\"mfw_v4lsink device=/dev/video18\"" SINK_3="\"mfw_v4lsink device=/dev/video20\"" media1=file:///root/media1 media2=file:///root/media2 media3=file:///root/media3 2 hdmi + lvds video=mxcfb0:dev=hdmi,1920x1080M@60,if=RGB24 video=mxcfb1:dev=ldb,LDB-XGA,if=RGB666 gl playbin2 uri=$media1 video-sink=$SINK_1 playbin2 uri=$media2 video-sink=$SINK_2 2 lvds + lvds video=mxcfb0:dev=ldb,LDB-XGA,if=RGB666 video=mxcfb1:dev=ldb,LDB-XGA,if=RGB666 gl playbin2 uri=$media1 video-sink=$SINK_1 playbin2 uri=$media2 video-sink=$SINK_2 2 lcd + lvds video=mxcfb0:dev=lcd,800x480M@55,if=RGB565 video=mxcfb1:dev=ldb,LDB-XGA,if=RGB666 gl playbin2 uri=$media1 video-sink=$SINK_1 playbin2 uri=$media2 video-sink=$SINK_2 3 hdmi + lvds + lvds video=mxcfb0:dev=hdmi,1920x1080M@60,if=RGB24 video=mxcfb1:dev=ldb,LDB-XGA,if=RGB6 video=mxcfb2:dev=ldb,LDB-XGA,if=RGB666 gl playbin2 uri=$media1 video-sink=$SINK_1 playbin2 uri=$media2 video-sink=$SINK_2 playbin2 uri=$media3 video-sink=$SINK_3

Audio transcoding # Transcode the input file into MP3 gst-launch filesrc location=media_file typefind=true ! beepdec ! mfw_mp3encoder ! matroskamux ! filesink location=output_audio_file.mk Audio transcoding + streaming # Transcode the input file into MP3 and stream it # On host, get the transcoded audio data gst-launch udpsrc port=8880 ! <CAPS_FROM_THE_TARGET> ! queue ! ffdec_mp3 ! alsasink # where <CAPS_FROM_THE_TARGET> can be something like 'audio/mpeg, mpegversion=(int)1, layer=(int)3, rate=(int)44100, channels=(int)2' # run the pipeline and check the caps gst-launch filesrc location=media_file typefind=true ! queue ! beepdec ! mfw_mp3encoder ! udpsink host=10.112.103.77 port=8880 -v Video Transcoding* # Transcode the input file into AVC (H-264) gst-launch filesrc location=media_file typefind=true ! aiurdemux name=demux ! queue ! vpudec ! vpuenc codec=avc ! matroskamux name=mux ! filesink location=output_media_file.mk Video Transcoding + scaling* # Transcode the input file into AVC (H264) and rescale video to 480p gst-launch filesrc location=media_file typefind=true ! aiurdemux name=demux ! queue ! vpudec ! mfw_ipucsc ! 'video/x-raw-yuv, width=(int)720, height=(int)480' ! vpuenc codec=avc ! matroskamux name=mux ! filesink location=output_media_file.mk Video transcoding + scaling + streaming* # NOTE: Run the pipelines in the presented order # On host, get the transcoded+scaled video data $ gst-launch udpsrc port=8888 ! <CAPS_FROM_THE_TARGET> ! queue ! ffdec_h264 ! xvimagesink # On target, run the pipeline and check the caps gst-launch filesrc location=media_file typefind=true ! aiurdemux name=demux ! queue ! vpudec ! mfw_ipucsc ! 'video/x-raw-yuv, width=(int)720, height=(int)480' ! vpuenc codec=avc ! udpsink host=$HOST_IP port=8888 -v * There is a limit for the number of pipelines which can be run simultaneously, for high resolution input files, at most two for 1080p and four for 720p.

Audio, from a file gst-launch filesrc location=test.wav ! wavparse ! mfw_mp3encoder ! filesink location=output.mp3 Audio Recording gst-launch alsasrc num-buffers=$NUMBER blocksize=$SIZE ! mfw_mp3encoder ! filesink location=output.mp3 # where #     duration = $NUMBER*$SIZE*8 / (samplerate *channel *bitwidth) # Example: 60 seconds recording # gst-launch alsasrc num-buffers=240 blocksize=44100 ! mfw_mp3encoder ! filesink location=output.mp3 # # To verify that is correct, do a normal audio playback gst-launch filesrc location=output.mp3 typefind=true ! beepdec ! audioconvert ! 'audio/x-raw-int,channels=2' ! alsasink Video, from a test source gst-launch videotestsrc ! queue ! vpuenc ! matroskamux ! filesink location=./test.avi Video, from a file gst-launch filesrc location=sample.yuv blocksize=$BLOCK_SIZE ! 'video/x-raw-yuv,format=(fourcc)I420, width=$WIDTH, height=$HEIGHT, framerate=(fraction)30/1' ! vpuenc codec=$CODEC ! matroskamux ! filesink location=output.mkv sync=false # where #     BLOCK_SIZE = WIDTH * HEIGHT * 1.5 #     CODEC = 0(MPEG4), 5(H263), 6(H264) or 12(MJPG). # # For example, encoding a CIF raw file gst-launch filesrc location=sample.yuv blocksize=152064 ! 'video/x-raw-yuv,format=(fourcc)I420, width=352, height=288, framerate=(fraction)30/1' ! vpuenc codec=0 ! matroskamux ! filesink location=sample.mkv sync=false Video, from Web camera # when the web cam is connected, the device node /dev/video0 should be present. In order to test the camera, without encoding gst-launch v4l2src ! mfw_v4lsink # in recording, run: # gst-launch v4l2src num-buffers=-1 ! queue max-size-buffers=2 ! vpuenc codec=0 ! matroskamux ! filesink location=output.mkv sync=false # # where sync=false indicates filesink to to use a clock sync # # In case a specific width/height is needed, just add the filter caps gst-launch v4l2src num-buffers=-1  ! 'video/x-raw-yuv,format=(fourcc)I420, width=352, height=288, framerate=(fraction)30/1' ! queue ! vpuenc codec=0 ! matroskamux ! filesink location=output.mkv sync=false # # In case you want to see in the screen what the camera is capturing, add a tee element # gst-launch v4l2src num-buffers=-1 ! tee name=t ! queue ! mfw_v4lsink t. ! queue ! vpuenc codec=0 ! matroskamux ! filesink location=output.mkv sync=false Video, from Parallel/MIPI camera # The camera driver needs to be loaded before executing the pipeline, refer to the BSP document to see which driver to load # MIPI (J5 port): modprobe ov5640_camera_mipi modprobe mxc_v4l2_capture   # Parallel (J9 port): modprobe ov5642_camera modprobe mxc_v4l2_capture   gst-launch mfw_v4lsrc ! queue ! vpuenc codec=0 ! matroskamux ! filesink location=output.mkv sync=false   # Do a 'gst-inspect mfw_v4lsrc' or 'gst-inspect vpuenc' to see other possible settings (resolution, fps, codec, etc.)

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>

Header 1 Header 2 Video rendering gst-launch videotestsrc ! mfw_v4lsink Audio rendering gst-launch audiotestsrc ! alsasink WAV Audio rendering gst-launch filesrc location=test.wav ! wavparse ! alsasink Video rendering selecting caps gst-launch videotestsrc ! capsfilter name='video/x-raw-yuv,format=(fourcc)I420' ! mfw_v4lsink gst-launch videotestsrc ! 'video/x-raw-yuv,format=(fourcc)I420' ! mfw_v4lsink

gst-inspect is a tool to to get documentation about GStreamer elements. Pipeline Check installed GST elements gst-inspect | tail -1 Check installed FSL GST elements gst-inspect | grep imx Element documentation gst-inspect <gst element>

gst-launch is the tool to execute GStreamer pipelines. Task Pipeline Looking at caps gst-launch -v  <gst elements> Enable log gst-launch --gst-debug=<element>:<level> gst-launch --gst-debug=videotestsrc:5 videotestsrc ! filesink location=/dev/null

Note: All these gstreamer pipelines have been tested using a i.MX6Q board with a kernel version 3.0.35-2026-geaaf30e. Tools: gst-launch gst-inspect FSL Pipeline Examples: GStreamer i.MX6 Decoding GStreamer i.MX6 Encoding GStreamer Transcoding and Scaling GStreamer i.MX6 Multi-Display GStreamer i.MX6 Multi-Overlay GStreamer i.MX6 Camera Streaming GStreamer RTP Streaming Other plugins: GStreamer ffmpeg GStreamer i.MX6 Image Capture GStreamer i.MX6 Image Display Misc: Testing GStreamer Tracing GStreamer Pipelines GStreamer miscellaneous

This PDF is training material for showing examples on video encoding, video decoding, video streaming on an i.MX53QSB board.

All Boards Creating App MP3 OpenEmbedded

BSP version: 11.03 Multimedia Package version: 11.03 1. Install BSP and Multi Media package (11.03 release) 2. Avoid Display Timeout: append the following line to rootfs/etc/oprofile: echo -e -n '\033[9]' > /dev/tty0 3. Set VGA port as the primary display in the kernel command line: video=mxcdi1fb:GBR24,VGA-XGA di1_primary vga 4. Connect a VGA monitor and WVGA display to the MX53 Quick Start 5. Boot Linux on MX53 Quick Start board (NFS is used in this example) 6. Unblank WVGA display (fb1): $ echo 0 > /sys/class/graphics/fb1/blank 7. On the target enter into /dev/shm directory. If the following files are present: vss_lock vss_shmem ,delete them. 8. On your host, edit the ltib/rootfs/usr/share/vssconfig as following: vss device definition Master=VGA, Slave=WVGA master display [VGA] type = framebuffer format = RGBP fb_num = 2 main_fb_num = 0 vs_max = 4 slave display [WVGA] type = framebuffer format = RGBP fb_num = 1 vs_max = 4 9. Run the Gstreamer pipeline below: gst-launch filesrc location=file.mp4 ! qtdemux ! mfw_vpudecoder ! mfw_isink display=VGA display-1=WVGA Video is played on the VGA and WVGA panels. A 720p file can be played at the same time.