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I have some old 3GP (mp4v codec)videos from my HTC desire S and when I try to drop them into Vegas they won't open so I decided to convert them to a format that would open. However when I convert to a standard mp4 template h.254 at a frame rate of 30, the video converts and plays back at twice the speed but the audio is original.

I cannot figure out the frame rate for the original video according to Gspot it is 16.393 and other videos its 9.901 etc

Here is the information from the container 3gp4: 3GPP Media (.3GP) Release 4

  • mp41: MP4 v1 [ISO 14496-1:ch13]
  • 3gp6: 3GPP Media (.3GP) Release 6 Basic Profile
  • Recommended Display Size: 800 x 480

How would I convert such videos to play back normally?

**EDIT INFORMATION FROM MEDIA INFO** Format : MPEG-4 Format profile : 3GPP Media Release 4 Codec ID : 3gp4 File size : 208 MiB Duration : 3mn 55s Overall bit rate : 7 430 Kbps Law rating : (empty) Released date : 0 Encoded date : UTC 2012-04-29 18:18:23 Tagged date : UTC 2012-04-29 18:18:23 Classification : (empty) **Video** ID : 1 Format : MPEG-4 Visual Format profile : Simple@L6 Format settings, BVOP : Yes Format settings, QPel : No Format settings, GMC : No warppoints Format settings, Matrix : Default (H.263) Codec ID : 20 Duration : 3mn 55s Bit rate mode : Constant Bit rate : 7 416 Kbps Nominal bit rate : 8 000 Kbps Width : 1 280 pixels Height : 720 pixels Display aspect ratio : 16:9 Frame rate mode : Variable Frame rate : 13.033 fps Minimum frame rate : 3.906 fps Maximum frame rate : 58.824 fps Color space : YUV Bit depth : 8 bits Scan type : Progressive Compression mode : Lossy Bits/(Pixel*Frame) : 0.617 Stream size : 208 MiB (100%) Language : English Encoded date : UTC 2012-04-29 18:18:23 Tagged date : UTC 2012-04-29 18:18:23 **Audio** ID : 2 Format : AMR Format/Info : Adaptive Multi-Rate Format profile : Narrow band Codec ID : samr Duration : 3mn 55s Bit rate mode : Constant Bit rate : 12.8 Kbps Channel(s) : 1 channel Sampling rate : 8 000 Hz Bit depth : 13 bits Stream size : 367 KiB (0%) Writing library : pvmm Language : English Encoded date : UTC 2012-04-29 18:18:23 Tagged date : UTC 2012-04-29 18:18:23
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  • Usually there is information about the original framerate in the details tab of the properties of the video. What are you using to convert your videos? Commented Jan 14, 2013 at 23:40
  • You say that if you convert it at a framerate of 30 fps it plays at twice the speed. Have you tried converting it with a framerata of 30/2 = 15 fps? And to make the question more complete: what software are you using for the conversion? Commented Jan 15, 2013 at 11:26
  • Yes I tried to convert it 15 too, but it didn't work. The only converter I used was the free version of Any Video Converter Commented Jan 15, 2013 at 11:28
  • Could you run MediaInfo on your footage and post it here? This will show all relevant information about your video. As I see it now it boils down to using AviSynth scripts. I'm looking into what exact script will help you, but you can of course take a look at the program yourself. Commented Jan 15, 2013 at 11:41
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    Here's someone with the same problem who has a solution through with Avisynth. Commented Jan 15, 2013 at 20:10

2 Answers 2

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Have you tried using Quicktime Pro version 7? It's what I usually use for file conversions. It costs about £20 / $30.

http://store.apple.com/uk/product/D3380Z/A/quicktime-7-pro-for-mac-os-x

Open your file.

Go to the file menu, and select Export Choose your format, e.g. Quicktime Movie with ProRes 422 codec at 30 fps.

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This is an excellent use case for gstreamer and the MKV format. gstreamer was written to tackle this problem nicely. It can be used and accompanied by ffmpeg to transcode a video into a constant or variable rate video format.

Here is a link to a great resource on solving this problem: https://www.linuxtv.org/wiki/index.php/V4L_capturing

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