[mythtv-users] MythTV Raspberry Pi2 frontend testers
Peter Bennett (cats22)
cats22 at comcast.net
Tue Nov 24 20:04:31 UTC 2015
On 11/23/2015 06:09 AM, Lawrence Rust wrote:
> On Sun, 2015-11-22 at 12:41 -0500, Peter Bennett (cats22) wrote:
>> On 11/17/2015 02:24 PM, Lawrence Rust wrote:
>>> If anyone would like to try it and provide some feedback then checkout
>>> the fixes-0.27-rpi2 branch from here:
>>> http://www.softsystem.co.uk/git/mythtv.git
>>>
>>>
>> I have done some more testing and I now have this set up on my kitchen
>> TV. It is working great and perfectly usable. Some issues I noticed:
>>
>> 1. Video is jerky and audio is interrupted when running stand alone
>> (QT_QPA_PLATFORM=eglfs). It works fine (no jerkiness) under xwindows
>> (QT_QPA_PLATFORM=xcb). So I am using it with xwindows. Following
>> observations are in that environment.
> Are you using HDMI audio? If so, this may be a bug that I need to look
> at.
>
>> 2. If you try to compensate for tv overscan by making the picture
>> smaller in /boot/config.txt or by using appearance setup in the mythtv
>> frontend setup, the video is shown at the requested smaller size but the
>> offset is not used, so a small video comes at the top left hand side of
>> the screen instead of centered. This only affects video playback, the
>> GUI menus and lists honor the settings correctly. You can make the video
>> smaller using the zoom feature while playing and that works correctly.
> I wasn't sure exactly how all the zooming, centring etc worked in Myth
> so I took a best guess. Following the existing NVidia and Xv code was
> gruelling. I will go back and check.
>
>> 3. If you pull up the menu while playing a recording (M key) or other
>> OSD displays such as Info (I key), the video becomes jerky while the OSD
>> is displayed.
> This indicates that the OSD is falling back to CPU rendered softblend.
> The opengl OSD uses EGL and requires Qt to run in EGLFS mode.
>
> I really need to find out why the EGLFS mode is jerky on some RPi's. I
> have 2 RPis and they both play smoothly in EGLFS mode with SD and 1080p
> video. I have these settings in /boot/config.txt:
>
> disable_overscan=1
> hdmi_drive=2
> # 1920x1080 @ 50Hz 16:9, clock:148MHz progressive
> hdmi_group=1
> hdmi_mode=31
>
>> 4. Subtitles do not work. You can select them but they do not display.
> I see subtitles on liveTV (BBC 1) and on DVD playback. Maybe this is
> something to do with the opengl OSD only being available with EGLFS
> mode. What happens if you select softblend in TV settings?
>
>> Great job. I hope we can get this in the official build. The above are
>> minor issues and if they are restrictions that will be OK in my opinion.
> My hope too. Unfortunately, I've not had a lot of success in getting my
> patches included. I'll work at resolving the problems you identified.
>
> -- Lawrence Rust
>
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Hi Lawrence
I am using analog audio in all cases.
I retested eglfs and compared it to xcb. I am using a 1080i recording.
See attached file mediainfo.txt for info about it.
eglfs - Jerky playback on a 1280x1024 DVI screen and using analog audio.
xcb - smooth playback, no jerkiness in this case
eglfs - smooth playback on an analog TV (I think it is treated as
720x480 by raspberry pi) composite with analog audio
xcb - also smooth playback in this case
I have an old analog TV and the edges of the display disappear, so the
GUI chops off at the left,right,top,bottom.
Overscan settings in config.txt fix this for most applications, but not
for MythTV frontend.
eglfs - overscan settings seem to be completely ignored.
xcb - overscan settings are partially used, the width of picture is
reduced but the position is still top left so you lose the top and left
of the GUI and get extra space at the bottom and right.
The other way of fixing the overscan is with the Front end Setup
Appearance page where you can set the width and position of the GUI and
whether playback should use the same settings.
eglfs - picture size settings are honored but position settings are
ignored, so that the top and left of the GUI are cut off and you get
extra space at the bottom and right. If you set playback to use the same
settings that is ignored, playback is still full screen with
top,left,bottom,right cut off.
xcb - picture size and position settings are honored so that the GUI is
displayed perfectly. If you set playback to use the same settings, the
size is honored but not the position so you get the top and left cut off
and extra space at the bottom and right.
I have a remote that uses the keyboard media keys. I use the "Setup
Keys" part of frontend setup to assign them appropriately.
eglfs - One media keys is not detected at all (STOP) and the others work
but with different codes from x-windows.
xcb - All media keys work.
OSD
eglfs - OSD works smoothly
xcb - OSD causes jerkiness
Subtitles
I am not seeing subtitles with either xcb or eglfs.
With normal front end on a particular show I get a choice of ATSC CC1
Subtitles or VBI CC1 subtitles. Either of these shows the same
subtitles, I don't know why two are shown.
With Raspberry Pi frontend I only see ATSC CC1 as a choice. Selecting it
says "Subtitles enabled" but they never appear on the screen.
Because of the issues with the display cutting off and the media key for
"stop" not working, xcb is preferable to me right now. I am using it
with an analog TV so there is no jerkiness whether I use eglfs or xcb.
Attached is my config.txt file.
Let me know if there is anything I can do to help.
Peter
-------------- next part --------------
# For more options and information see
# http://www.raspberrypi.org/documentation/configuration/config-txt.md
# Some settings may impact device functionality. See link above for details
# uncomment if you get no picture on HDMI for a default "safe" mode
#hdmi_safe=1
# uncomment this if your display has a black border of unused pixels visible
# and your display can output without overscan
disable_overscan=1
# uncomment the following to adjust overscan. Use positive numbers if console
# goes off screen, and negative if there is too much border
#overscan_left=32
#overscan_right=32
#overscan_top=24
#overscan_bottom=24
# uncomment to force a console size. By default it will be display's size minus
# overscan.
#framebuffer_width=1280
#framebuffer_height=720
# uncomment if hdmi display is not detected and composite is being output
#hdmi_force_hotplug=1
# uncomment to force a specific HDMI mode (this will force VGA)
#hdmi_group=1
#hdmi_mode=1
# uncomment to force a HDMI mode rather than DVI. This can make audio work in
# DMT (computer monitor) modes
#hdmi_drive=2
# uncomment to increase signal to HDMI, if you have interference, blanking, or
# no display
#config_hdmi_boost=4
# uncomment for composite PAL
#sdtv_mode=2
#uncomment to overclock the arm. 700 MHz is the default.
#arm_freq=800
gpu_mem=256
decode_MPG2=0x483455c1
-------------- next part --------------
General
ID : 5607 (0x15E7)
Complete name : 120419 SE Untitled.mpg
Format : MPEG-TS
File size : 3.51 GiB
Duration : 30mn 13s
Overall bit rate mode : Variable
Overall bit rate : 16.6 Mbps
Video
ID : 4209 (0x1071)
Menu ID : 1 (0x1)
Format : MPEG Video
Format version : Version 2
Format profile : Main at High
Format settings, BVOP : Yes
Format settings, Matrix : Custom
Codec ID : 2
Duration : 30mn 13s
Bit rate mode : Variable
Bit rate : 15.2 Mbps
Maximum bit rate : 20.0 Mbps
Width : 1 920 pixels
Height : 1 080 pixels
Display aspect ratio : 16:9
Active Format Description : Pillarbox 4:3 image
Frame rate : 29.970 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Interlaced
Scan order : Top Field First
Compression mode : Lossy
Bits/(Pixel*Frame) : 0.245
Stream size : 3.21 GiB (92%)
Audio #1
ID : 4210 (0x1072)
Menu ID : 1 (0x1)
Format : AC-3
Format/Info : Audio Coding 3
Mode extension : CM (complete main)
Codec ID : 129
Duration : 30mn 13s
Bit rate mode : Constant
Bit rate : 384 Kbps
Channel(s) : 6 channels
Channel positions : Front: L C R, Side: L R, LFE
Sampling rate : 48.0 KHz
Bit depth : 16 bits
Compression mode : Lossy
Delay relative to video : -564ms
Stream size : 83.0 MiB (2%)
Language : English
Audio #2
ID : 4211 (0x1073)
Menu ID : 1 (0x1)
Format : AC-3
Format/Info : Audio Coding 3
Mode extension : VI (visually impaired)
Codec ID : 129
Duration : 30mn 13s
Bit rate mode : Constant
Bit rate : 192 Kbps
Channel(s) : 2 channels
Channel positions : Front: L R
Sampling rate : 48.0 KHz
Bit depth : 16 bits
Compression mode : Lossy
Delay relative to video : -671ms
Stream size : 41.5 MiB (1%)
Language : Spanish
Text #1
ID : 4209 (0x1071)-608-1
Menu ID : 1 (0x1)
Format : EIA-608
Muxing mode : A/53 / DTVCC Transport
Muxing mode, more info : Muxed in Video #1
Duration : 30mn 13s
Bit rate mode : Constant
Stream size : 0.00 Byte (0%)
Text #2
ID : 4209 (0x1071)-1
Menu ID : 1 (0x1)
Format : EIA-708
Muxing mode : A/53 / DTVCC Transport
Muxing mode, more info : Muxed in Video #1
Duration : 30mn 13s
Bit rate mode : Constant
Stream size : 0.00 Byte (0%)
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