Raspberry Pi + Systemd + Python App + VLC/CVLC = 1080 only, no 4K

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nixternal
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Raspberry Pi + Systemd + Python App + VLC/CVLC = 1080 only, no 4K

Postby nixternal » 25 Jun 2020 00:57

OK, this is weird. I have been battling this all day & have been unsuccessful as of yet. I am working on a project that is Python based. The project is started via systemd scripts. Weird thing is vlc/cvlc works to an extent, it will run a 1080 vid just fine but not 4K. If I run the python app from the command line, everything works perfectly. Running the app from systemd is the wonkiness.

For instance, when it is run with the following code & service script, It will play a 1080 file but not a 4K file. If I run the python outside of systemd script, it will play a 1080 & 4k file just fine. Try it out with the following & let me know if you can figure it out. I greatly appreciate any & all help. Thanks!

EDITED: Rémi pointed me in the right direction for the dbus issue, but the bigger issue is the lack of 4K when using systemd now. Thanks Rémi!!! I've added more Environment= to the service file, but still no luck as of yet.

EDIT: ADDED VLC LOG TO REPLY

PYTHON CODE (testvlc):

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#!/usr/bin/env python from subprocess import Popen, PIPE import time vid = 'somevideo.mp4' cmd = 'DISPLAY=:0 cvlc -f --no-osd %s -L' % vid Popen(cmd, shell=True, stdout=PIPE, stderr=PIPE) while True: print("Hello!") time.sleep(5)
SYSTEMD SCRIPT (testvlc.service) added Environment= stuff per Rémi's response, thanks!:

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[Unit] Description=Test VLC From Python Script [Service] User=user Environment="DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/1001/bus" Environment="DISPLAY=:0" Environment="XDG_RUNTIME_DIR=/run/user/1001" Environment="XAUTHORITY=/home/ppp/.Xauthority" ExecStart=/usr/bin/screen -D -S testvlc -m /home/user/testvlc [Install] WantedBy=multi-user.target
Last edited by nixternal on 25 Jun 2020 19:08, edited 4 times in total.

Rémi Denis-Courmont
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Re: Systemd + Python App that runs VLC/CVLC = No dbus

Postby Rémi Denis-Courmont » 25 Jun 2020 15:44

Check the logs. Probably it can't find the session bus.
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nixternal
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Re: Systemd + Python App that runs VLC/CVLC = No dbus

Postby nixternal » 25 Jun 2020 18:11

Check the logs. Probably it can't find the session bus.
Thanks Rémi for pointing me in the right direction with your response. Now to figure out the 4K issue.

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Re: Raspberry Pi + Systemd + Python App + VLC/CVLC = 1080 only, no 4K

Postby nixternal » 25 Jun 2020 19:07

VLC LOG FILE --verbose=2
Only errors were mmal_avcodec errors at the bottom of the log file.

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main debug: VLC media player - 3.0.11 Vetinari main debug: Copyright © 1996-2020 the VideoLAN team main debug: revision 3.0.11-0-gdc0c5ced72 .... main debug: `file:///home/media/BigBuckBunny_HEVC-1.mp4' gives access `file' demux `any' path `/home/media/BigBuckBunny_HEVC-1.mp4' main debug: creating demux: access='file' demux='any' location='/home/media/BigBuckBunny_HEVC-1.mp4' file='/home/media/BigBuckBunny_HEVC-1.mp4' .... main debug: no stream_filter modules matched main debug: looking for stream_directory module matching "any": 1 candidates main debug: no stream_directory modules matched main debug: attachment of directory-extractor failed for file:///home/media/BigBuckBunny_HEVC-1.mp4 main debug: looking for stream_filter module matching "record": 26 candidates main debug: using stream_filter module "record" main debug: creating demux: access='file' demux='any' location='/home/media/BigBuckBunny_HEVC-1.mp4' file='/home/media/BigBuckBunny_HEVC-1.mp4' main debug: looking for demux module matching "mp4": 55 candidates mp4 debug: dumping root Box "root" mp4 debug: | + ftyp size 24 offset 0 mp4 debug: | + moov size 3645 offset 24 mp4 debug: | | + mvhd size 108 offset 32 mp4 debug: | | + trak size 3529 offset 140 mp4 debug: | | | + tkhd size 92 offset 148 mp4 debug: | | | + mdia size 3429 offset 240 mp4 debug: | | | | + mdhd size 32 offset 248 mp4 debug: | | | | + hdlr size 66 offset 280 mp4 debug: | | | | + minf size 3323 offset 346 mp4 debug: | | | | | + vmhd size 20 offset 354 mp4 debug: | | | | | + dinf size 36 offset 374 mp4 debug: | | | | | | + dref size 28 offset 382 mp4 debug: | | | | | | | + url size 12 offset 398 mp4 debug: | | | | | + stbl size 3259 offset 410 mp4 debug: | | | | | | + stsd size 239 offset 418 mp4 debug: | | | | | | | + hvc1 size 223 offset 434 mp4 debug: | | | | | | | | + hvcC size 117 offset 520 mp4 debug: | | | | | | | | + btrt size 20 offset 637 mp4 debug: | | | | | | + stts size 24 offset 657 mp4 debug: | | | | | | + ctts size 1840 offset 681 mp4 debug: | | | | | | + stss size 20 offset 2521 mp4 debug: | | | | | | + stsc size 52 offset 2541 mp4 debug: | | | | | | + stsz size 980 offset 2593 mp4 debug: | | | | | | + stco size 96 offset 3573 mp4 debug: | + mdat size 2512740 offset 3669 mp4 debug: | + free size 59 offset 2516409 mp4 debug: unrecognized major media specification (iso4). mp4 debug: found 1 tracks mp4 debug: track[Id 0x1] read 20 chunk mp4 warning: STTS table of 1 entries mp4 warning: CTTS table of 228 entries mp4 debug: track[Id 0x1] read 240 samples length:10s main debug: selecting program id=0 mp4 debug: adding track[Id 0x1] video (enable) language undef main debug: using demux module "mp4" main debug: looking for a subtitle file in /home/media/ main debug: looking for video decoder module matching "any": 18 candidates mmal_codec debug: OpenDecoder: <<< (hevc/----)[----] 3840x2160 0/0=0/0 o:0 -> (----/----) 0x0 0/0 o:0 mmal_avcodec debug: MmalAvcodecOpenDecoder: <<< (hevc/----)[----] 3840x2160 -> (----/----) 0x0 [CMA/536870912] xb:3 mmal_avcodec debug: using ffmpeg Lavc58.35.100 mmal_avcodec debug: CPU flags: 0x0000003f mmal_avcodec: Looking for HEVC decoder 'hevc' mmal_avcodec debug: allowing 3 thread(s) for decoding mmal_avcodec debug: codec (hevc) started mmal_avcodec debug: using frame thread mode with 3 threads main debug: using video decoder module "mmal_avcodec" .... main debug: no meta reader modules matched main debug: `file:///home/media/BigBuckBunny_HEVC-1.mp4' successfully opened mp4 debug: track[Id 0x1] using Sync Sample Box (stss) mp4 debug: stss gives 0 --> 0 (sample number) main debug: Buffering 0% main debug: Buffering 25% main debug: Buffering 50% main debug: Buffering 75% main debug: Buffering 100% main debug: Stream buffering done (1250 ms in 1 ms) mmal_avcodec debug: Pool size: (8+3) * 12441600 mmal_avcodec warning: Failed to preallocate decoder pool (8+3) * 12441600 mmal_avcodec error: CMA buf pool alloc buf failed mmal_avcodec error: avcodec_send_packet critical error main error: buffer deadlock prevented main debug: Decoder wait done in 101 ms mmal_avcodec error: CMA buf pool alloc buf failed mmal_avcodec error: CMA buf pool alloc buf failed main debug: EOF reached main debug: killing decoder fourcc `hevc' main debug: removing module "mmal_avcodec" mmal_avcodec debug: <<< MmalAvcodecCloseDecoder main debug: removing module "mp4" mp4 debug: freeing all memory main debug: Program doesn't contain anymore ES main debug: removing module "record" main debug: removing module "cache_read" main debug: removing module "filesystem" main debug: dead input main debug: changing item without a request (current 0/1) main debug: nothing to play
Last edited by nixternal on 26 Jun 2020 16:33, edited 2 times in total.

nixternal
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Re: Raspberry Pi + Systemd + Python App + VLC/CVLC = 1080 only, no 4K

Postby nixternal » 25 Jun 2020 19:50

Here is the mmal_avcodec section from a good 4k file run taken when not using systemd:

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main debug: looking for video decoder module matching "any": 18 candidates mmal_codec debug: OpenDecoder: <<< (hevc/----)[----] 3840x2160 0/0=0/0 o:0 -> (----/----) 0x0 0/0 o:0 mmal_avcodec debug: MmalAvcodecOpenDecoder: <<< (hevc/----)[----] 3840x2160 -> (----/----) 0x0 [CMA/536870912] xb:3 mmal_avcodec debug: using ffmpeg Lavc58.35.100 mmal_avcodec debug: CPU flags: 0x0000003f mmal_avcodec: Looking for HEVC decoder 'hevc' mmal_avcodec debug: allowing 3 thread(s) for decoding mmal_avcodec debug: codec (hevc) started mmal_avcodec debug: using frame thread mode with 3 threads main debug: using video decoder module "mmal_avcodec" main debug: looking for meta reader module matching "any": 2 candidates lua debug: Trying Lua scripts in /home/ppp/.local/share/vlc/lua/meta/reader lua debug: Trying Lua scripts in /usr/lib/arm-linux-gnueabihf/vlc/lua/meta/reader lua debug: Trying Lua playlist script /usr/lib/arm-linux-gnueabihf/vlc/lua/meta/reader/filename.luac lua debug: Trying Lua scripts in /usr/share/vlc/lua/meta/reader main debug: no meta reader modules matched main debug: `file:///home/media/BigBuckBunny_HEVC-1.mp4' successfully opened mp4 debug: track[Id 0x1] using Sync Sample Box (stss) mp4 debug: stss gives 0 --> 0 (sample number) main debug: Buffering 0% main debug: Buffering 25% main debug: Buffering 50% main debug: Buffering 75% main debug: Buffering 100% main debug: Stream buffering done (1250 ms in 1 ms) mmal_avcodec debug: Pool size: (8+3) * 12441600

nixternal
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[SOLVED] Raspberry Pi + Systemd + Python App + VLC/CVLC = 1080 only, no 4K

Postby nixternal » 26 Jun 2020 16:32

The fix, put the systemd service script in ~/.config/systemd/user/ and use systemctl --user enable. Not what I wanted, but it works & is a solution. Change the service script a little of course:

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[Unit] Description=Test VLC From Python Script After=graphical-session.target [Service] ExecStart=/usr/bin/screen -D -S testvlc -m /home/user/testvlc [Install] WantedBy=default.target

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Re: Raspberry Pi + Systemd + Python App + VLC/CVLC = 1080 only, no 4K

Postby llamafilm » 14 Jan 2021 23:39

Have you figured out the reason for this? I have the same problem but even HD doesn't work. I suspect it's something to do with the HEVC decoder. This looks like the problem but I don't know why it only happens when running via systemd

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Pool size: (3+3) * 4177920 Failed to preallocate decoder pool (3+3) * 4177920 CMA buf pool alloc buf failed avcodec_send_packet critical error

I tried making it a user service like this, and then it work to run manually, but it does not run automatically on reboot.


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