Hi John

Nice to see you are still here and it's great to be back😃

The Yi records mp4 and I have never heard of MediaInfo, so downloaded it and ran a Yi file through it. The results mean absolutely nothing to me so I have uploaded it to see what you make of it. Hope it means something to you.

Roger

Hi Roger.

Thanks for posting the MediaInfo details; unfortunately, at least part of the audio data is missing from your screen shot!

Perhaps the easiest method of presenting the complete MediaInfo data is to choose View>Text and then select all the text and copy and paste it to your next message.

Jeff

Hi Jeff,

Thanks for the reply, I didn't think the audio data would be particularly relevant, but I suppose anything could disrupt playback. So as per your suggestion, here is the pasted text info:-

General
Complete name                            : C:\Users\MollyG Productions\Desktop\VIDEO EDITING\4k Yi Camera\YDXJ0060.MP4
Format                                   : MPEG-4
Format profile                           : JVT
Codec ID                                 : avc1 (avc1/isom)
File size                                : 471 MiB
Duration                                 : 52 s 120 ms
Overall bit rate mode                    : Variable
Overall bit rate                         : 75.9 Mb/s
Encoded date                             : UTC 1970-01-01 00:33:37
Tagged date                              : UTC 1970-01-01 00:33:37

Video
ID                                       : 1
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : Main@L5.1
Format settings                          : CABAC / 1 Ref Frames
Format settings, CABAC                   : Yes
Format settings, RefFrames               : 1 frame
Format settings, GOP                     : M=1, N=8
Codec ID                                 : avc1
Codec ID/Info                            : Advanced Video Coding
Duration                                 : 52 s 120 ms
Bit rate mode                            : Variable
Bit rate                                 : 75.0 Mb/s
Width                                    : 2 704 pixels
Height                                   : 1 520 pixels
Display aspect ratio                     : 16:9
Frame rate mode                          : Constant
Frame rate                               : 50.000 FPS
Standard                                 : Component
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Bits/(Pixel*Frame)                       : 0.365
Stream size                              : 467 MiB (99%)
Title                                    : XiaoYi AVC   
Language                                 : English
Encoded date                             : UTC 1970-01-01 00:33:37
Tagged date                              : UTC 1970-01-01 00:33:37
Color range                              : Full
Color primaries                          : BT.709
Transfer characteristics                 : BT.709
Matrix coefficients                      : BT.709

Audio
ID                                       : 2
Format                                   : AAC
Format/Info                              : Advanced Audio Codec
Format profile                           : LC
Codec ID                                 : mp4a-40-2
Duration                                 : 52 s 117 ms
Bit rate mode                            : Constant
Bit rate                                 : 128 kb/s
Nominal bit rate                         : 48.0 kb/s
Channel(s)                               : 2 channels
Channel positions                        : Front: L R
Sampling rate                            : 48.0 kHz
Frame rate                               : 46.875 FPS (1024 SPF)
Compression mode                         : Lossy
Stream size                              : 814 KiB (0%)
Title                                    : XiaoYi AAC   
Language                                 : English
Encoded date                             : UTC 1970-01-01 00:33:37
Tagged date                              : UTC 1970-01-01 00:33:37

Much of it is just stuff I don't know :-(

Roger

Hi Roger

Thanks for the MediaInfo data, the odd data that I can see is:

Bit rate                                 : 75.0 Mb/s

this is unusually high for a resolution of

Width                                    : 2 704 pixels
Height                                   : 1 520 pixels

I would have expected figures in the range 35 - 45 Mb/s

The resolution is also a little odd in that it does not fit in with the 'standard' resolutions, being in between 2k and 4k, however this should not be an issue with MEP as the GoPro can also record this resolution.

Are you using the same resolution settings in the GoPro, and what is the MediaInfo data for a GoPro clip that plays OK?

I found a similar question from 1 year ago with the same camera and issue - it would suggest that the audio was the problem - once it was removed the video played back fine, however the actual solution is confused as too many different things were done at once including installing an all in one codec pack which is definitely not recommended.

If you do not need the audio try removing it to see if this enables playback without crashing.

HTH

John EB

Hi John,

I often use 2.7x1.5 to record on the action cams as it enables me to crop down to 1080 to narrow the angle but maintain res. I don't think the bit rate is a problem as I record a lot of footage in 4k at a much higher rate, which is never a problem. I'll try removing the audio in the morning and report back as I am trying to finish a 3 continuous camera plus 2 audio recorder edit at the moment which I have already spent 12 hours on today, so the eyes are drooping heavily.

Thanks,

Roger

Hi Roger

Searching other forum's posts indicate the error is caused by the audio and removal or re encoding just the audio fixes the problem in MEP2016 which is probably equivalent to VPX7 in its build / features. The post I think John is referring to says that the problem does not subsequently occur with MEP2017 so Magix may have fixed it in later versions as they were aware of the issue back in 2016.

The only thing I see different in Media Info is that there is a Audio bit rate of 128kps but also a Nominal Audio BR of 48kbps which I have not seen in my file's analyses and would only expect to see in a VBR, not a constant bitrate mode. I know that MEP/VPX does not like non standard BR but could not say whether that was the problem here.

Apparently using a converter - Xmedia recode you have the option of a Copy as opposed to an Encode which fixes the issue in some cases.

Peter

On the other hand it may be the JVT format of the AVC file......

This is what fileextension.org says:-

Help how to open JVT files:

This file type is not meant to be opened directly, there is no software that could open and work with it directly, or there is no information available in public sources about opening this file type. This is usually the case of some internal data files, caches, temporary files etc.

How to convert file with extension JVT:

As far as we know, this .jvt file type can't be converted to any other file format. This is usually the case of system, configuration, temporary, or data files containing data exclusive to only one software and used for its own purposes. Also some proprietary or closed file formats cannot be converted to more common file types in order to protect the intellectual property of the developer, which is for example the case of some DRM-protected multimedia files.

Did the camera that created it have a software that came with it that you could import the file into and then output a file from?

How about Rt click the file in explorer and "Open this file with > Video ProX7" and see what happens.

Peter

@Scenestealer

Hi Peter

AFAICS the 'JVT' codec id identified by MediaInfo is the early name for the codec - see here - which is now known as AVC.

@RogerGunkel

Can you upload a short anonymous clip to somewhere like Dropbox or Google Drive for us to try importing - it is important that the clip is an original, uploading to somewhere like Youtube, Vimeo or here will convert the video..

Thanks

John EB

Hi Guys,

Thanks for the replies and I wondered about the JVT id as I hadn't seen it before. I tried removing the audio this morning as suggested and that did indeed allow the video to be played, but with a lot of stuttering so Magix is not happy about something else. I'll take a bit of footage at 1080 25fps and put it in dropbox when I take a break later.

There was no software that came with the camera and Windows media player plays the files with no problem at all. My LG smart tv also won't play them although it plays all the other mp4 files I throw at it.

@Peter, I'll download xMedia recode and give that a try. Rt click-open with VPX7 doesn't work either.

Roger

Just downloaded xMedia recode and copied the file that I posted the data on It took 4 seconds to copy and now plays in VPX7 but still stutters a lot. I imported it next to a 4k panasonic track which plays perfectly although it has a much higher bitrate.

I'll take a few seconds of footage shortly on the Y1 for dropbox.

Roger

OK, just had a quick walk in the public car park near the house on a dismal, cold, windy day to take 26 seconds on the Yi at 1080 25fps. Now on dropbox https://www.dropbox.com/s/am0alh81gmwjkqq/YDXJ0138.MP4?dl=0

I loaded it into Magix, hit play and it immediately froze, needing task manager to shut down Magix. Then tried soloing the video track and it played ok with the occasional stutter. Also tried just muting the audio track and it plays, but the moment I unmute the audio track, the whole programme locks up.

I then tried making a straight copy in xMedia recode and it plays fine, so it definitely looks like a problem with the audio. I can probably manage without the audio as I would usually use with a separate sound recorder, but I have never experienced this problem before.

I'll also check the Yi website to see if there is a firmware update.

Roger

Don't know if I am missing something, but xMedia recode doesn't seem to have any provision for converting 4k footage to anything above 1080 x1920. I can copy but not convert without losing the higher resolution.

Roger

Hi Roger.

Downloaded your file, opened it in the latest VPX (version 15.0.4.176, I don't have VPX7, sorry) and it played without jerkiness or any other problem!

Not sure I fully understand your second question about resolution; the downloaded file is reported by MediaInfo as being 1920 x 1080 so no downscaling is involved, I think. Or have I completely misunderstood your question?

Jeff

Sorry Jeff, it's me being confusing, the question about the 4k conversion was completely separate from the other problem as I wanted to try re-encoding some 4k but can't get above 1080 in xMedia.

As regards you being able to run the other file normally, there must be some updated codecs in your version that are missing in my earlier one. The update notifications from Magix stopped coming to me ages ago and I assumed that when they took on Vegas they had stopped updates on VPX7. I never knew there had been a VPX8 let alone the latest VPX, until I came back on to the forum this week. There may well have been newer codecs in 8. The only update on the Magix site available to me seems to be the £299 upgrade to VPX which I really don't need to waste hard earned money on if a new codec would do the job. As a long time Magix user I'm disappointed that I seem to have been missed out particularly after all the previous upgrades I purchased!!

Roger

Hi Roger.

Just out of interest I opened your file in VPX5, the only other version of the program I have. Attempting to play the file caused VPX5 to crash immediately, so it would appear your surmise about updated codecs in more recent versions may well be correct.

In order to attempt to find out what codecs my computer used to play your file I opened (the now very old) GSpot utility. It was not very informative, other than to tell me that it was using the avc1 codec to play the file, presumably a component of the more recent VPX.

As to the price for updating: when you click through to the page listing the program do you not see an "upgrade" button, as below:

If so, have you clicked through it?

Jeff

Hi Roger

The nearest program I have to VPX 7 is MEP 2016, Windows 10 1703 finally saw off my older VPX and 2 older versions of MEP.

I get the same problem in MEP 2016 - program hangs, MEP 2018 plays the video correctly as does VPX 8.

However if delete the audio or run the clip through MovAvi Video Converter and just change the audio bitrate to 192 kbps and import into MEP 2016, they both play fine.

After some more digging I have found out that the audio Codec ID: mp4a-40-2 is AAC-LC which is a very common codec, particular for mobile devices. It is also the codec that MEP exports mp4 uses for AAC audio 😲

IIRC there have been similar issues with video from some mobile devices video with earlier versions of MEP.

As you do not need the audio then removing this is a work around.

HTH

John EB

Hi Roger,

I downloaded your file and tried it on VPX7 14.0.0.155 on my laptop (Surface Pro 4). I was able to get it on the timeline and scrub across it, but the program froze as soon as I hit play. I tried to export the file to mxv and the same thing, it started and froze.

You should be able to upgrade to the latest version for about half of the price since you have VPX7. Strangely for Magix, there is no advert upon exiting VPX7 as there is with older versions of MEP offering an upgrade price. Try clicking on the Upgrade button on the Magix.com site to see how much it will cost you.

John CB

Apologies for the delay replying, I've had a long evening visiting a new client and just got back in.

I tried clicking on one of the update buttons and it showed the £299 price, the same as they are advertising on their general site. I have tried sending them an email describing the codec problem and asking for their comments on the lack of upgrade information. It will be interesting to see if I get a response.

Meanwhile I can either delete or reprocess the audio to enable me to use the clips, so there are work arounds. Had another peculiarity late afternoon, when I went to export to an MP4 file, only to find that the programme had changed, with a completely different export menus and some of the options that I had been using now disappeared!! Very strange!

Thanks for your help so far :-)

Roger

Hi

As in my earlier post:-

"Searching other forum's posts indicate the error is caused by the audio and removal or re encoding just the audio fixes the problem in MEP2016 which is probably equivalent to VPX7 in its build / features. The post I think John is referring to says that the problem does not subsequently occur with MEP2017 so Magix may have fixed it in later versions as they were aware of the issue back in 2016."

I can confirm that it plays fine in MEP2017 and note that there were 9 different patches out of 11 for this version that listed the fixing of "errors that lead to crashes". This was probably one.

"The only thing I see different in Media Info is that there is a Audio bit rate of 128kps but also a Nominal Audio BR of 48kbps which I have not seen in my file's analyses and would only expect to see in a VBR, not a constant bitrate mode."

I really think the above has something to do with the sounds incompatibility. @johnebaker what does media info now show on the clip you converted?

"Apparently using a converter - Xmedia recode you have the option of a Copy as opposed to an Encode which fixes the issue in some cases."

@RogerGunkel

xMedia recode doesn't seem to have any provision for converting 4k footage to anything above 1080 x1920. I can copy but not convert without losing the higher resolution.

Isn't this all you need then? Once you can get it to play in VPX7 without crashing, then you can convert it there.

Peter

Hi Peter

Yes definitely the audio causing the problem, so I can now work round that.

The main reason for wanting to put the 4K footage through Recoder was to reduce the bit rate at the same time as correcting the audio problem, as the Yi 4K footage stutters quite badly in Magix.

Just found some good news from Magix in my spam email folder. My sign in now works with the upgrade information and I can get the VFX upgrade now for £149. I'll try it out and see if it solves all the problems before buying, as that is the same sort of price I was previously paying for my regular upgrades.

Roger

@RogerGunkel

And you will some new features (maybe) over the course of the next 365 days with the Update Service. Unfortunately, you missed the good deals with the NewBlue and Hitfilm addons, so you may want to wait a bit if you can, until the next sale.

John CB

Hi John,

Hopefully it will do what I need for a while plus I should be able to transfer the add ons from VPX7 including mercalli V4 and New Blue Effects. Certainly the colour matching will be a blessing as I use 3 cameras at every wedding we film, which is the main part of our business.

Roger