blender Unable to open a display

[sunny123123]

I know nothing about blender. I just want generate some different views pictures with one obj file. My blender is 2.90.0. I got below error when I run command

blender --background --python render_blender.py -- --output_folder temp bugatti.obj

Blender 2.90.0 (hash 0330d1af29c0 built 2020-08-31 11:54:54)
ALSA lib confmisc.c:768:(parse_card) cannot find card '0'
ALSA lib conf.c:4292:(_snd_config_evaluate) function snd_func_card_driver returned error: No such file or directory
ALSA lib confmisc.c:392:(snd_func_concat) error evaluating strings
ALSA lib conf.c:4292:(_snd_config_evaluate) function snd_func_concat returned error: No such file or directory
ALSA lib confmisc.c:1251:(snd_func_refer) error evaluating name
ALSA lib conf.c:4292:(_snd_config_evaluate) function snd_func_refer returned error: No such file or directory
ALSA lib conf.c:4771:(snd_config_expand) Evaluate error: No such file or directory
ALSA lib pcm.c:2266:(snd_pcm_open_noupdate) Unknown PCM default
/run/user/1000/gvfs/ non-existent directory
found bundled python: /home/inveno/payne/3d/blender-2.90.0-linux64/2.90/python
Info: Deleted 1 object(s)
Info: Deleted 1 object(s)
(  0.0001 sec |   0.0001 sec) Importing OBJ 'bugatti.obj'...
  (  0.0002 sec |   0.0001 sec) Parsing OBJ file...
    ( 18.7100 sec |  18.7098 sec) Done, loading materials and images...
    ( 18.7277 sec |  18.7275 sec) Done, building geometries (verts:744213 faces:759882 materials: 40 smoothgroups:1) ...
    ( 35.2136 sec |  35.2135 sec) Done.
  ( 35.2138 sec |  35.2137 sec) Finished importing: 'bugatti.obj'
Progress: 100.00%

Info: Removed 2672 vertice(s)
Info: Removed 2672 vertice(s)
Rotation 0.0, 0.0
Unable to open a display

Any suggestions will help me , thanks

[mvoelk]

ALSA is related to audio and is not a blender specific issue. It actually means what is written there, no audio device found. Maybe a driver issue...

[sunny123123]

@mvoelk thanks for your reply. I will try resolve the ALSA question. But I think the key point is Unable to open a display. I forgot to add that my OS is ubuntu 18.04

[mvoelk]

It typically means there is no x server running, but I'm not sure if it is required...

[panmari]

1. Do you have Xorg installed on the machine you're trying this?
2. According to this, switching to the "cycles" renderer might be an option. Try the same command with --engine=CYCLES.

[ldo]

You can probably get rid of the error messages about audio by adding the “-noaudio” option to the Blender command.

[michimussato]

@panmari this is just to let you know that your workaround --engine=CYCLES will fail in case you render grease pencil elements - even in Cycles.
@sunny123123 , a more reliable solution can be found here: nytimes/rd-blender-docker#6 (comment)