How to set stereo downmixing in SMPlayer's mplayer options? #5
-
|
Downmixing 5.1 to stereo is not so good even with default settings as on PotPlayer for Windows. I found on an old forum a pan filter, which should be better:
When putting only How can I set this pan filter in the settings of SMPlayer? |
Beta Was this translation helpful? Give feedback.
Replies: 4 comments 1 reply
-
|
In Preferences -> Advanced -> MPlayer/mpv, type this in the "audio filters" field: You also have to be using mplayer as multimedia engine (Preferences -> General). |
Beta Was this translation helpful? Give feedback.
-
|
Hello, The pan filter was not working for me. There's an example in the end of mplayer's man where it's used for downmixing a 6 channel AAC to stereo, using pan=2, not pan=6 : For my video I ended up using to force decoding the 6 channel and then downmix them with the pan filter. I'm still confused about how it works, I guess it's the number of channels in the first parameter then a routing matrix for the six channels with negative value feeding phase switched signal. With channel order being Center, Front L, Front R, Back L, back R and LFE (not sure about that). I also added a filter to boost by 10dB because the sound was really low, but I monitored the level on easyeffect and it seemed there were no clipping. mplayer -channels 6 -af pan=2:.32:.32:.39:.06:.06:.39:.17:-.17:-.17:.17:.33:.33,volume=10 |
Beta Was this translation helpful? Give feedback.
-
|
Okay, I tested that further with pan=2:1:0:0:0:0:0:0:0:0:0:0:0, then pan=2:0:1:0:0:0:0:0:0:0:0:0:0, then pan=2:0:0:1:0:0:0:0:0:0:0:0:0, etc. So the level routing matrix parameters are definately grouped by channels, but for my video the orders are not the same that were described in mplayer man example (mine is an ac3 surround of an mkv file). With the tweaks I think it's Front L, Front R, Back L, Back R, Center and LFE. I've modified the filter parameters pan=2:.39:.06:.06:.39:.17:-.17:-.17:.17:.32:.32:.33:.33,volume=10 I think the results are OK, voices are a lot better now and stereo image in actions scenes seems to be alright. |
Beta Was this translation helpful? Give feedback.
-
|
I noticed that in my instance the filter doesn't work as it should, i.e. only the first 5 parameters (FR and FL source channels) are working. |
Beta Was this translation helpful? Give feedback.
In Preferences -> Advanced -> MPlayer/mpv, type this in the "audio filters" field:
pan=6:.32:.39:.06:.17:-.17:.33:.32:.06:.39:-.17:.17:.33You also have to be using mplayer as multimedia engine (Preferences -> General).