converting video for a media player Roku Panasonic Android
Media players are awesome, but only play certain types of videos. Currently I work with a newish Panasonic TV (awesome), a Roku (very good), and a Bluray player with a USB port (pretty good).
All of these are rather particular about which videos and which codecs and which audio theyll play. Sometimes everything will be great, but the sound will be out of sync! Or everything will be in sync... until the end of the movie, where things will gradually get messed up.
Its helpful to have a workflow to iron out video conversion issues quickly.
What finally worked for me was:
1) install Handbrake (both handbrake-gtk and handbrake-cli)
2) convert 20-ish seconds several minutes into the program
3) copy video to USB stick
4) put in media player, try it
5) change conversion settings, repeat from step 2
Here is step #2 in a command line:
HandBrakeCLI -i input.avi --start-at duration:200 --stop-at duration:20 -o z.mp4
Lastly, its easy to automate this. This debugging script prints out input.mp4 for each input.avi file:
for input in *.avi ; do echo ${input%.avi}.mp4 ; done
Many video files have spaces, which Linux doesnt like too well. Quote them:
for input in *.avi ; do echo "$input" "${input%.avi}.mp4" ; done
Putting it all together, we can convert all our videos to mediaplayer-friendly MP4 files with this one-liner. In my case I found adding the "deblock" filter made my bad source files a little nicer to watch:
for input in *.avi ; do HandBrakeCLI -i "$input" --deblock -o "${input%.avi}.mp4" ; done
If youre insane like me, convert the movies in parallel, two at a time (P2):
for input in *.avi ; do echo "${input%.avi}" ; done | xargs -i -P2 HandBrakeCLI -i "{}".avi -o "{}".mp4The output will stutter, as Handbrake will write multiple status lines on top of each other, but thems the breaks.
A version of this on bashoneliners.com
alternative link download
