Does anyone else use a Canon VIXIA HF G40? I'm shooting HD1080 in MP4 format, and the audio cuts out in the last two 30fps frames of each 4G file. Memory card is Sanddisk Extreme Pro 128GB.
No problem with Canon M500, Panasonic 4k, nor GoPros.
Before I send the camera to Canon for repair, I wanted to see if anyone else has this problem. Thanks.
Could this be a function of the camera dividing files on 4GB boundaries?
Is the card formatted FAT32 or exFAT.
Was the card formatted in this camera at the start of the shoot?
Did you use the camera import tool or Vegas Pro to import and join files?
John,
The card was formatted by the G40. It's exFAT. I use an SD card reader to transfer to the PC. And, yes, it only happens when the video is longer than 4GB and the camera starts a new file.
Richard
Like john_dennis mentioned: It may all depend on how you import such files. Usually the Vegas Pro Device Explorer does a good job and avoids such cut-aways. You should not import such 4GB chunk files by a simple drag&drop or copy&paste directly from the SD card.
Marco,
I appreciate your trying to help, but a file is a file. The file copy process doesn't know about the internal formatting of the data. And copying from the card works on every other camera.
Regards,
Richard
The way files are joined are different. And if there are several chunks of one recording session they will be joined when you use an appropriate tool. I wouldn't mention this if we hadn't lots of experiences like yours in the past decade. Usually tools like the Device Explorer solve such issues (unfortunately not in all cases).
And, yes, it only happens when the video is longer than 4GB and the camera starts a new file.
That is a no-brainer to the people who have already responded.
I appreciate your trying to help, but a file is a file
@Marco. and @john_dennis are 100% correct. The files should be imported and joined with your camera's import utility or Vegas Device Explorer, not Windows Explorer.
The reason is to preserve GOP integrity and insertion of I-Frames at cut points. Otherwise, the long-GOP structure is not closed, and glitches and sync errors will occur.
Now, you've heard it from 60+ years of combined commercial experience. Interframe compression technology was introduced to the public twenty years ago, and we were there, FBOFW.
Best of luck.
Use the software that came with the camera as advised. Best advice.
Failing that use the old DOS concatenate command.
eg copy /b clip1.mp4+clip2.mp4+clip3.mp4+clip4.mp4 combined.mp4 This works with GoPro files
Musicvid,
The Vegas Device Explorer does not recognize .MP4 files. It recognized .MTS AVCHD files, but I'm not using that format. The Canon utility also says it's only for AVCHD.
So I don't doubt there are some formats that have a problem with splitting; I think maybe 15-20 years ago with AVCHD or MP2 I had a video glitch problem. But the Canon M500 (2GB files) does not have this problem, nor does GoPro. And the video is fine.
If you can recommend another package that works with .mp4, I'll try it.
I found a free program call mp4joiner. It DOES eliminate the 2 frame audio dropout! And it does NOT re-encode. It combined 15GB in 2:08 minutes (on an m.2). This also solves the problem of adding media fx for each file!
So thanks to everyone for your input.
Glad you found your own solution!
A tiny historical clarification: AVCHD has been with us in Vegas for 10 years. The utility that came packed with your G40 opens files from your G40. 2 GB files are short GOP, almost universally, as that is for for Pre-NTFS file systems.
Thanks for the tip about mp4joiner. You can bet I will be testing it further, and using it for my own production and recommending if it is reliable without frame reprocessing!