So, I am trying to subtitle an mp4 file....

[Sayoria]

And when I do, I get no sound. I am opening the video through Avisynth into VD and for some reason, I get no audio at all. My current script says:

Code: Select all

FFMPEGSource("C:\Users\Don\Downloads\Batsu Games\(2009) No-Laughing Hotel Employee\No-Laughing Hotel Disc 1.mp4") 

Is there something I need to add to get the audio in there?

[CodeZTM]

Have you tried WAVSource and plugging in a separate audio file that matches the video?

[Sayoria]

My sound keeps coming in about 5 seconds ahead of the lipsync. =/

[CodeZTM]

Is the audio file and the video file the same length? Try and export your workspace only and export the two separately.

[Sayoria]

I got it fixed. I needed to add ", atrack=-1" after the file location. My audio was put in. Also, I realized that the time off wasn't the sound clip's fault. VD keeps audio setting to like....3 times the regular speed, and I mis-wrote the accurate FPS.

[Mister Hatt]

Don't ever run your audio through avisynth. Even though it's fixed, load your audio via vdub directly, and don't use VBR. Reasons are complicated but basically boil down to avisynth handling audio incredibly poorly (not that anyone here notices quality or accuracy) and vdub not being able to accurately match audio samples to frames when VBR audio is used.

[Tab.]

Is it too late to point out that MP4 supports soft subtitles?
MP4Box can import them from SRT: http://gpac.wp.institut-telecom.fr/mp4b ... mentation/

[Mister Hatt]

No, you're just stupid. GPAC's MP4 supports TTXT, which is what it converts SRT to, but lavf won't demux it. Adobe however supports only TTXML (a bluray subtitle format that nobody uses, similar to SSA4 and Kate). Sony only support muxing TTXT but not playing it back. Apple don't support it at all. You're starting to see where I'm going with this? MP4 is a common file extension which various formats all use. They are loosely similar but they all have different rules on formats and muxing and demuxing. When it comes down to it, you can include subtitles, but almost nothing will read them, and certainly not the way you'd expect. In a test I did a few months ago with Adobe's TTXML in MP4, a file that fully conformed wouldn't even play in THEIR player.

[Tab.]

lavf won't demux it.

Wrong.

Adobe however supports only TTXML (a bluray subtitle format that nobody uses, similar to SSA4 and Kate). Sony only support muxing TTXT but not playing it back.

Relevant in what way? MP4 is a production format, not an editing format.

Apple don't support it at all.

Both QuickTime and the iOS playback engine support it fine.

No, you're just stupid.

It's clear by now you don't actually bother to verify anything you're saying, but this one is way out of line.

[HalOfBorg]

I know it's all fixed, but Aegisub for soft subs.

http://www.aegisub.org/