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| ALbino |
| Posted: Sep 27 2014, 02:15 AM |
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Advanced Member
Group: Members
Posts: 101
Member No.: 26983
Joined: 9-February 10
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Hey all,
With the prevalence of things like iPhones that film everything with a Variable Frame Rate I was wondering if someone has come up with a solution on how to use Virtualdub with VFR and not lose audio sync? I understand that it's theoretically supposed to create duplicate frames to make up for when the frame rate drops, but I'm still having sync issues. Any input would be appreciated, thanks. |
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| dloneranger |
| Posted: Sep 27 2014, 09:26 AM |
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Moderator
Group: Moderators
Posts: 2366
Member No.: 22158
Joined: 26-September 07
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How do you open them now? (any input plugins etc)
The ffmpeg plugin has code in it that works out frame length so you could try that - I don't have any vfr files to test
If that doesn't work there's an alpha of the next version you can test
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MultiAdjust JoinWav WavNormalize FFMPeg Input Plugin v1827 UnSharpMask
Windows7/8 Codec Chooser
All FccHandlers Stuff inc. Installers for acm codecs AAC, AC3, LameMp3 |
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| ALbino |
| Posted: Sep 27 2014, 05:43 PM |
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Advanced Member
Group: Members
Posts: 101
Member No.: 26983
Joined: 9-February 10
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| QUOTE (dloneranger @ Sep 27 2014, 09:26 AM) | How do you open them now? (any input plugins etc)
The ffmpeg plugin has code in it that works out frame length so you could try that - I don't have any vfr files to test
If that doesn't work there's an alpha of the next version you can test |
I open them by dragging them in, and they open just fine and play no problem except for the sync stuff. I tried using FFInputDriver.vdplugin with the same results. I also tried re-deriving the key frames thinking maybe somehow magically that would work, but it didn't :) |
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| dloneranger |
| Posted: Sep 27 2014, 06:00 PM |
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Moderator
Group: Moderators
Posts: 2366
Member No.: 22158
Joined: 26-September 07
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Try this and see if it helps, it's a test version that uses the frame duration
https://dl.dropboxusercontent.com/u/1702491...Malaksbane2.zip
(You might want to check the file info after opening a file to make sure you've picked the right plugin for loading - sounds silly, but forgetting to pick the plugin is a regular problem)
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MultiAdjust JoinWav WavNormalize FFMPeg Input Plugin v1827 UnSharpMask
Windows7/8 Codec Chooser
All FccHandlers Stuff inc. Installers for acm codecs AAC, AC3, LameMp3 |
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| Abrazo |
| Posted: Sep 27 2014, 08:56 PM |
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Advanced Member
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Posts: 775
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I recently bought a Samsung smartphone, and it seems like recorded videos have the MP4 format with H264 (1280x720) and AAC encoding (48Khz / mono).
When I open one of my private recordings for a test in VirtualDub, I have following results, depending on the inputfilter:
- FFMPEG (Malaksbane2 testversion) - 509 frames - 16:826 sec - framerate 30,25
- Quicktime - 631 frames - 16:827 sec - framerate 37,5
- DirectShow - 421 frames - 16:840 sec - framerate 25
Somewhere on the internet (via Google), I found an article saying that Apple QuickTime should play such a videos correctly and that Handbrake should be able to convert the variable framerate into constant framerate:
> http://www.lwks.com/index.php?option=com_k...Itemid=81#78861 |
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| dloneranger |
| Posted: Sep 27 2014, 09:09 PM |
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Moderator
Group: Moderators
Posts: 2366
Member No.: 22158
Joined: 26-September 07
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Whoever thought up VFR should be taken outside and shot - the space savings are so not worth the headache
You should also check the audio length vs video length
I have a note3 and the quicktime plugins gives silly frame rates and length that's wildly different to the audio length
FFMpeg plugin seems to be right, but I haven't got a clip with talking on to check sync all the way through
(I use a test version that's a bit newer than the one above but basically the same)
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MultiAdjust JoinWav WavNormalize FFMPeg Input Plugin v1827 UnSharpMask
Windows7/8 Codec Chooser
All FccHandlers Stuff inc. Installers for acm codecs AAC, AC3, LameMp3 |
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| ALbino |
| Posted: Sep 28 2014, 05:37 PM |
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Advanced Member
Group: Members
Posts: 101
Member No.: 26983
Joined: 9-February 10
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| QUOTE (dloneranger @ Sep 27 2014, 06:00 PM) | Try this and see if it helps, it's a test version that uses the frame duration
https://dl.dropboxusercontent.com/u/1702491...Malaksbane2.zip
(You might want to check the file info after opening a file to make sure you've picked the right plugin for loading - sounds silly, but forgetting to pick the plugin is a regular problem) |
Unfortunately that didn't work, but thanks for the idea.
However, Abrazo suggested Handbrake and it totally worked. I changed it from "Variable Framerate" to "Constant Framerate" and now when I open it in Virtualdub it reports 25fps and is in sync. The only disappointing thing is that using Handbrake forces me to re-compress it to h.264 again, but considering it's cell phone video in the first place it's probably not that big of a deal when set to a high enough quality. |
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