Video speed too fast on AVI files (audio normal)

[seahorse1223]

I have two AVI files that play back just fine on the camcorder but have index problems when played on the computer. Both files play the video much too fast (audio is normal speed) when I choose to have VLC build the temporary index file. One of them has the same problem when I choose to play it as is; the other plays the video at the proper speed, but cuts off the last 45 seconds or so. Is there another way to get them to sync up, and/or a way to slow down just the video portion during conversion? Any suggestions would be appreciated!

[seahorse1223]

The camera is an entry-level model by Onshowy (https://smile.amazon.com/gp/product/B06 ... UTF8&psc=1). I am running Windows 10. I'm not sure what you mean by Dx, sorry; the camera belongs to my 10-year-old and none of us have any experience with this. I've used VLC for playback and simple file conversions and that's it.

[Lotesdelere]

The AVI container is broken and/or contains some error(s).
You should remux the file.

[seahorse1223]

Thanks! How do I do that?

[Lotesdelere]

Use FFmpeg:

Code: Select all

ffmpeg -i input.avi -c copy output.avi

Or if you prefer a GUI, some other dedicated tools like AviDemux and use the copy streams feature.

[seahorse1223]

FFmpeg wouldn't run on my computer. I downloaded AviDemux, but am not seeing a copy streams feature...?

(Thanks for your patience with a total noob!)

[Lotesdelere]

FFmpeg can run on any computer using Windows XP or higher, but it has no GUI, it's a command line utility.

Avidemux opens by default with the copy streams options enabled:
Video output = Copy
Audio output = Copy
Output format = AVI muxer

[seahorse1223]

I followed the steps listed here to set up FFmpeg (https://video.stackexchange.com/questio ... in-windows), but the command prompt still can't find it.

Avidemux did the same thing as VLC to the second file (fixed the speed issue, but cut off the end) and couldn't open the other one at all.

Side question: Do you know what would be causing this problem? Is it an issue with the way the camera saves the files, or is there something else going on?

[Lotesdelere]

For the command line prompt window: on Windows Vista and newer, press and hold the SHIFT key while you right-click the folder where FFmpeg.exe is located, then click on Open Command Window Here.

And I'm quite sure FFmpeg will show a bunch of errors while processing the file

[seahorse1223]

Got FFmpeg working, but the video on the first file still comes out too fast. The second file comes out the same as with Avidemux and VLC (proper speed, but cut off; there is some weird flickering during that portion of the source file, so it may be that the programs simply stop when they hit it and that's the best we'll get).

[Lotesdelere]

There is not much you can do, looks like the camcorder is creating bad files.
You should look for help on the manufacturer site, maybe a firmware update ?

[seahorse1223]

We'll try that approach. Thanks so much for your help!