Handbrake-CLI on Synology NAS - bash

Question

I installed Docker on my Synology NAS (DS415+) and tried to run the handbrake-cli (via this package) over ssh.
However, something seems to be broken. I get the following error message after a simple sudo docker run -d supercoder/docker-handbrake-cli -i ~/_inProgress/input/movie.mkv -o ~/_inProgress/output/test.mp4 (I shortened the error message for readability):
- hb_init: starting libhb thread
- HandBrake 0.10.1 (2015030800) - Linux x86_64 - https://handbrake.fr
- 4 CPUs detected
- Opening /var/services/homes/xxx/_inProgress/input/movie.mkv...
- CPU: Intel(R) Atom(TM) CPU C2538 # 2.40GHz
- Intel microarchitecture Silvermont
- logical processor count: 4
- OpenCL: library not available
- hb_scan: path=/var/services/homes/xxx/_inProgress/input/movie.mkv, title_index=1
- libbluray/bdnav/index_parse.c:162: indx_parse(): error opening /var/services/homes/xxx/_inProgress/input/movie.mkv/BDMV/index.bdmv
- libbluray/bdnav/index_parse.c:162: indx_parse(): error opening /var/services/homes/xxx/_inProgress/input/movie.mkv/BDMV/BACKUP/index.bdmv
- libbluray/bluray.c:2182: nav_get_title_list(/var/services/homes/xxx/_inProgress/input/movie.mkv) failed
- bd: not a bd - trying as a stream/file instead
- libdvdnav: Using dvdnav version 5.0.1
- libdvdread: Encrypted DVD support unavailable.
- libdvdread: Can't stat /var/services/homes/xxx/_inProgress/input/movie.mkv
- No such file or directory
- libdvdread: Could not open /var/services/homes/xxx/_inProgress/input/movie.mkv
- libdvdnav: vm: failed to open/read the DVD
- dvd: not a dvd - trying as a stream/file instead
- hb_stream_open: open /var/services/homes/xxx/_inProgress/input/movie.mkv failed
- scan: unrecognized file type
- libhb: scan thread found 0 valid title(s)
- No title found.
- HandBrake has exited.
I followed this blog post originally and got the same message there.
Executing the same thing on my desktop works without any problems.
Anyone got an idea?

Answer 1

When running the docker instance, your input and output file do not exist in the container. You need first to mount the input and output directories of you file system as volumes (as shown in the blog post you shared)
-v ~/_inProgress/output/:/outout:rw
-v ~/_inProgress/input/:/input:ro
And then you use those paths in the options:
-i /input/<file>
-o /output/<file>
Good luck!