Latest comment: 1 month ago9 comments3 people in discussion
Not sure why you would need to convert to mp4 and back again. WebM can handle multiple audio tracks just as well as mp4. This sounds more like a limitation of the video editing software you are using. —TheDJ (talk • contribs) 13:18, 29 July 2024 (UTC)Reply
Nope, but there is just no reason to go to mp4. You can simply remux the file with another audio track and keep the same video track and write back a new webm file. MP4 does not have to be involved. —TheDJ (talk • contribs) 19:37, 29 July 2024 (UTC)Reply
I have checked and the three leading softwares for video editing (Adobe Premiere, Final Cut Pro and DaVinci Resolve) can't handle webm. Theklan (talk) 22:08, 29 July 2024 (UTC)Reply
OK, i did not count on commercial software packages being so out of sync with modern times :)
But still, in terms of quality preservation, I would export the audio track from the mp4, and then remux webm file with ffmpeg to inject the audio track and preserve the original quality of the video track. —TheDJ (talk • contribs) 20:20, 30 July 2024 (UTC)Reply
Very much agree. People won't do this. Instead it should be done automatically or via a button (incl API for redubbing software) like "add audio channel to this video".
However, the part The current approach for dubbing a video is downloading the original video, converting it from .webm to .mp4, dubbing it seems wrong. Why do you convert to mp4? Audio channels can also be added to webm files and I've done that a few times with ffmpeg. By the way a problem there was that one needs to first remove the audio then add the audio channel then readd the audio from the unmuted video if one wants the audio channel to be channel 1 or the one that is played on WMC (e.g. when redubbing a German video to English and wanting English to be in channel 1) – let me know if there is a way around that. Prototyperspective (talk) 11:44, 31 July 2024 (UTC)Reply
Multiple subtitle tracks would also complement this very well
Latest comment: 1 month ago3 comments3 people in discussion
While we're at it, it would be useful to have multiple subtitle tracks for different languages. Subtitle tracks also have the advatage that they can be(a) used to create spoken audio tracks using TTS software, and also (b) be created automatically from spoken audio tracks using transcription software, both of which are available as open source. The Anome (talk) 18:34, 3 August 2024 (UTC)Reply
Aren't these already implemented with TimedTexts? One could write the subtitles to the video files but that's probably not what you mean. So it's about reading subtitles of videos, right? That would indeed be useful. However, on that end, often not even the only subtitles of videos get read – see phab:T368298. By the way, one thing I noticed using open source software to redub videos on WMC is that there's often issues when using the subtitles people made so often one gets a better result letting the software transcribe anew and then using that instead of the subtitles. Best would be a way to merge these (machine transcription can get e.g. names and occasionally a word wrong) or adjust the timings of the manually-made transcript, that's also what my other proposal is about. Prototyperspective (talk) 23:15, 3 August 2024 (UTC)Reply
Multiple subtitle tracks can be done now. Take a look to this:
