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| | {{InfoBoxTop}} | | {{InfoBoxTop}} |
| | {{AppliesToAXELULite}} | | {{AppliesToAXELULite}} |
| − | {{AppliesToAXEL ULite AN}}
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| | {{AppliesToSBCLynx}} | | {{AppliesToSBCLynx}} |
| − | {{AppliesTo SBC Lynx AN}}
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| | {{InfoBoxBottom}} | | {{InfoBoxBottom}} |
| − | {{WarningMessage|text=This application note was validated against specific versions of the kit only. It may not work with other versions. Supported versions are listed in the ''History'' section.}}
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| | == History == | | == History == |
| | {| class="wikitable" border="1" | | {| class="wikitable" border="1" |
| | !Version | | !Version |
| − | !Xuelk version
| |
| | !Date | | !Date |
| | !Notes | | !Notes |
| | |- | | |- |
| | |1.0.0 | | |1.0.0 |
| − | |1.1.3
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| | |May 2017 | | |May 2017 |
| | |First release | | |First release |
| | |- | | |- |
| | |} | | |} |
| − |
| |
| | ==Introduction== | | ==Introduction== |
| | As known, i.MX6UL SoC is not designed to implement rich complex user interfaces (UI), even though it integrates an LCD controller. However, even simple UIs might require playing some sort of low-resolution videos. | | As known, i.MX6UL SoC is not designed to implement rich complex user interfaces (UI), even though it integrates an LCD controller. However, even simple UIs might require playing some sort of low-resolution videos. |
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| | This application note describes some tests that were performed on an AXELULite-based platform to evaluate the capabilities and the performances of the i.MXUL when it comes to playing such videos. The test bed was based on Debian Jessie distribution, as described [[XUELK-AN-002:_Running_Debian_distribution|here]]. | | This application note describes some tests that were performed on an AXELULite-based platform to evaluate the capabilities and the performances of the i.MXUL when it comes to playing such videos. The test bed was based on Debian Jessie distribution, as described [[XUELK-AN-002:_Running_Debian_distribution|here]]. |
| | | | |
| − | ==gstreamer==
| + | TBD indicare caratteristiche del test bed (frequenza, RAM, risoluzione pannello ecc.). |
| − | Starting from original Debian root file system provided [https://mirror.dave.eu/lynx/debian/20170403/20170403-sbclynx-debian-8-usd.zip here], more packages need to be added for using the well known multimedia framework [https://gstreamer.freedesktop.org gstreamer]
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| − | | |
| − | More info about gstreamer can be found [https://gstreamer.freedesktop.org here] and on Github [https://github.com/GStreamer gstreamer] server
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| − | | |
| − | | |
| − | We assume that network interface has been already configured as described on [[XUELK-AN-002:_Running_Debian_distribution|XUELK-AN-002: Running Debian distribution]].
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| − | | |
| − | ===Adding gstreamer packages===
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| − | | |
| − | It is possibile to install the complete '''gstreamer 1.0''' suite (easy way to have the richest rfs configuration for gstreamer usage)
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| − | | |
| − | <pre class="board-terminal">
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| − | root@arm:~# apt-get install gstreamer1.0
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| − | Reading package lists... Done
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| − | Building dependency tree
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| − | Reading state information... Done
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| − | ...
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| − | The following NEW packages will be installed:
| |
| − | ...
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| − | gstreamer1.0-clutter gstreamer1.0-doc gstreamer1.0-fluendo-mp3
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| − | gstreamer1.0-gnonlin gstreamer1.0-gnonlin-dbg gstreamer1.0-gnonlin-doc
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| − | gstreamer1.0-libav gstreamer1.0-libav-dbg gstreamer1.0-nice
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| − | gstreamer1.0-packagekit gstreamer1.0-plugins-bad
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| − | gstreamer1.0-plugins-bad-dbg gstreamer1.0-plugins-bad-doc
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| − | gstreamer1.0-plugins-base gstreamer1.0-plugins-base-apps
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| − | gstreamer1.0-plugins-base-dbg gstreamer1.0-plugins-base-doc
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| − | gstreamer1.0-plugins-good gstreamer1.0-plugins-good-dbg
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| − | gstreamer1.0-plugins-good-doc gstreamer1.0-plugins-ugly
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| − | gstreamer1.0-plugins-ugly-dbg gstreamer1.0-plugins-ugly-doc
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| − | ...
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| − | usb-modeswitch usb-modeswitch-data usbmuxd va-driver-all x11-common
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| − | x11-utils xkb-data
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| − | 0 upgraded, 517 newly installed, 0 to remove and 32 not upgraded.
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| − | Need to get 252 MB of archives.
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| − | After this operation, 713 MB of additional disk space will be used.
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| − | Do you want to continue? [Y/n] Y
| |
| − | </pre>
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| − | | |
| − | as it's shown on installation log, apt-get asks for installing 713MB of additional packages. In case you are looking for a reduced space installation, you may need to select the minimum required packages for video decoding.
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| − | | |
| − | Tipically, it is enough to install:
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| − | | |
| − | <pre>
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| − | gstreamer1.0-tools
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| − | gstreamer1.0-plugins-base
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| − | gstreamer1.0-plugins-good
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| − | gstreamer1.0-plugins-bad
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| − | gstreamer1.0-plugins-ugly
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| − | gstreamer1.0-videosink
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| − | </pre>
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| − | | |
| − | but required packages are strictly related to the gstreamer pipeline invoked and what kind of video/audio stream want to be decoded.
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| − | | |
| − | ===gstreamer pipeline===
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| − | | |
| − | The pipeline used is the easiest one for decoding a local file on rfs
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| − | | |
| − | gst-launch-1.0 -vvv playbin uri=file:///root/''<local_filename>'' video-sink=fbdevsink
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| − | | |
| − | ==Test bed==
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| − | * iMX6UL cpu has 3 scaling frequencies availables requested by cpu load
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| − | <pre class="board-terminal">
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| − | root@arm:~# cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
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| − | interactive
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| − | root@arm:~# cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies
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| − | 198000 396000 528000
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| − | </pre>
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| − | * iMX6UL cpu is running at 528MHz when decoding
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| − | <pre class="board-terminal">
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| − | root@arm:~# cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq
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| − | 528000
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| − | </pre>
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| − | * system DRAM is 256MB
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| − | * lcd panel is 800x480
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| − | | |
| − | ==Results==
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| − | ===Use case #1: MPEG4 640x360@24fps===
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| − | * file: BigBuckBunny_640x360.mp4
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| − | * video: MPEG-4 video 4:2:0 @ 640x360 resolution
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| − | * pipeline:
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| − | <pre class="board-terminal">
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| − | gst-launch-1.0 -vvv playbin uri=file:///root/video/BigBuckBunny_640x360.mp4 video-sink=fbdevsink
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| − | </pre>
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| − | * top process shows that cpu is running at 99%
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| − | | |
| − | <pre class="board-terminal">
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| − | top - 08:24:14 up 1:28, 2 users, load average: 0.19, 0.18, 0.38
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| − | Tasks: 60 total, 1 running, 59 sleeping, 0 stopped, 0 zombie
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| − | %Cpu(s): 98.4 us, 1.3 sy, 0.0 ni, 0.0 id, 0.0 wa, 0.0 hi, 0.3 si, 0.0 st
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| − | KiB Mem: 247172 total, 244012 used, 3160 free, 30660 buffers
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| − | KiB Swap: 0 total, 0 used, 0 free. 123020 cached Mem
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| − | | |
| − | PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
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| − | 11998 root 20 0 121480 18880 6180 S 99.4 7.6 0:09.77 gst-launch-1.0
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| − | 11997 root 20 0 2980 1068 756 R 0.7 0.4 0:00.20 top
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| − | 1 root 20 0 25840 2972 1880 S 0.0 1.2 0:14.17 systemd
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| − | 2 root 20 0 0 0 0 S 0.0 0.0 0:00.01 kthreadd
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| − | ...
| |
| − | </pre>
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| − | | |
| − | This is the reasonable ''maximum video resolution'' that can be fully decoded in software (this is due to iMX6UL absence of 3D hardware accelerator)
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| − | | |
| − | ===Use case #2: MPEG4 320x180@24fps===
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| − | This use case is similar to the previous one, but the same video file has been scaled to 1/4 the original dimension (0.5 horizontal and 0.5 vertical)
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| − | | |
| − | * file: BigBuckBunny_320x180.mp4
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| − | * video: MPEG-4 video 4:2:0 @ 320x180 resolution
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| − | <pre class="board-terminal">
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| − | gst-launch-1.0 -vvv playbin uri=file:///root/video/BigBuckBunny_320x180.mp4 video-sink=fbdevsink
| |
| − | </pre>
| |
| − | * top process shows that cpu is running at 42%
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| − | | |
| − | <pre class="board-terminal">
| |
| − | top - 08:26:59 up 1:31, 2 users, load average: 1.21, 0.68, 0.54
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| − | Tasks: 60 total, 1 running, 59 sleeping, 0 stopped, 0 zombie
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| − | %Cpu(s): 41.1 us, 1.7 sy, 0.0 ni, 57.2 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
| |
| − | KiB Mem: 247172 total, 243736 used, 3436 free, 30796 buffers
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| − | KiB Swap: 0 total, 0 used, 0 free. 125184 cached Mem
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| − | | |
| − | PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
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| − | 12004 root 20 0 121068 17116 6372 S 42.4 6.9 0:10.00 gst-launch-1.0
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| − | 11997 root 20 0 2980 1068 756 R 0.7 0.4 0:01.29 top
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| − | 30 root rt 0 0 0 0 S 0.3 0.0 0:03.86 cfinteractive
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| − | 11610 root 20 0 0 0 0 S 0.3 0.0 0:02.05 kworker/0:0
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| − | ...
| |
| − | </pre>
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| − | | |
| − | This can be a more ''real use case'' where the cpu is partially devoted to video decoding and can perform the other usual tasks (graphics, user interaction, peripherals controls, etc.) without major impacts.
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| − | | |
| − | ==Demo on youtube==
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| − | | |
| − | {| class="wikitable" | width="100%"
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| − | | {{#ev:youtube|AsgtEc1jwVY|500|center|Video MPEG and QT5.9 running on i.MX6 UL |frame}}
| |
| − | |}
| |
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