When I try to either drag a .ogg file into the window on the remux tab, or select the file from the file picker, the page flashes briefly and does not appear to have loaded the file. Going to the console from developer tools, I see
[AVFormatContext @ 0x2ab750] Unable to choose an output format for 'output.oga'; use a standard extension for the filename or specify the format manually.
at location
put_char | @ | libav-5.5.6.1.1-remux-cli.thr.mjs:662
and a printout that says "not a valid file".
I can play the file normally in Windows Media Player and VLC media plyer.
microsoft edge Version 136.0.3240.50 on windows 10
additional context
No response
Originally created by @ketan-ryan on GitHub (May 5, 2025).
Original GitHub issue: https://github.com/imputnet/cobalt/issues/1260
### bug description
When I try to either drag a .ogg file into the window on the remux tab, or select the file from the file picker, the page flashes briefly and does not appear to have loaded the file. Going to the console from developer tools, I see
[AVFormatContext @ 0x2ab750] Unable to choose an output format for 'output.oga'; use a standard extension for the filename or specify the format manually.
at location
put_char | @ | libav-5.5.6.1.1-remux-cli.thr.mjs:662
and a printout that says "not a valid file".
I can play the file normally in Windows Media Player and VLC media plyer.
### reproduction steps
Go to cobalt.tools/remux
Download the ferrous_wroughtnaught.ogg file from https://github.com/BobMowzie/MowziesMobs/blob/master/src/main/resources/assets/mowziesmobs/sounds/music/ferrous_wroughtnaut.ogg
Drag the file into cobalt.tools/redux (or choose if from the file picker)
View the observed behavior and console output
### screenshots
### links
```shell
https://github.com/BobMowzie/MowziesMobs/blob/master/src/main/resources/assets/mowziesmobs/sounds/music/ferrous_wroughtnaut.ogg
```
### platform information
microsoft edge Version 136.0.3240.50 on windows 10
### additional context
_No response_
GiteaMirror
added the bug label 2026-08-18 03:19:54 -05:00
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Originally created by @ketan-ryan on GitHub (May 5, 2025).
Original GitHub issue: https://github.com/imputnet/cobalt/issues/1260
bug description
When I try to either drag a .ogg file into the window on the remux tab, or select the file from the file picker, the page flashes briefly and does not appear to have loaded the file. Going to the console from developer tools, I see
[AVFormatContext @ 0x2ab750] Unable to choose an output format for 'output.oga'; use a standard extension for the filename or specify the format manually.
at location
put_char | @ | libav-5.5.6.1.1-remux-cli.thr.mjs:662
and a printout that says "not a valid file".
I can play the file normally in Windows Media Player and VLC media plyer.
reproduction steps
Go to cobalt.tools/remux
Download the ferrous_wroughtnaught.ogg file from https://github.com/BobMowzie/MowziesMobs/blob/master/src/main/resources/assets/mowziesmobs/sounds/music/ferrous_wroughtnaut.ogg
Drag the file into cobalt.tools/redux (or choose if from the file picker)
View the observed behavior and console output
screenshots
links
platform information
microsoft edge Version 136.0.3240.50 on windows 10
additional context
No response