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This might be a technical question, but it's not a programming question. Just something I'm wondering about, and maybe some of you can present me with an explanation.
It's quite common nowadays that you use your mobile phone to record a video clip, often in mp4 format.
I have seen some examples now that such a clip is shown correctly in some players but rotated 90 degrees to the left in other players.
I've got an example right now. The missus asked me to help one of her compter illiterate colleagues. Ha had recorded a video in portrait mode and it shows in landscape mode rotated 90 degrees.
I tried it for myself, and sure enough: In Windows Media player, it shows fine, but when I view it in VLC it is rotated.
Can anyone explain this? And how the fluck do I get it to play correctly in all players? Apparently it's now a question of merely rotating it as I started out thinking... 
Anything that is unrelated to elephants is irrelephant
Anonymous
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The problem with quotes on the internet is that you can never tell if they're genuine
Winston Churchill, 1944
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I'd just like a chance to prove that money can't make me happy.
Me, all the time
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It's because some players recognise the correct up direction (a particular flag is set when the video was recorded) and some don't. One way to guarantee it is correct is to open it in your preferred video editing software, rotate it 90 degrees and resave it.
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Thanks. I tried rotating it using VLC player, but that just corrupted the file. In the end, I used MP4Box which corrected the problem and preserved all other settings.
Am I the only one who's thinking "Why the hell is this a problem at all?"
Anything that is unrelated to elephants is irrelephant
Anonymous
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The problem with quotes on the internet is that you can never tell if they're genuine
Winston Churchill, 1944
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I'd just like a chance to prove that money can't make me happy.
Me, all the time
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Johnny J. wrote: Am I the only one who's thinking "Why the hell is this a problem at all?
I don't know if this may be the cause but different devices have different default orientations.
I noticed this when I was playing around with HTML5 detecting device orientation. Zero degrees was when the phone was in portrait mode and when the tablet was in landscape mode. All rotations were relative to those orientations on the respective devices.
Try making a video on a phone and a tablet and see if this has any effect on the orientation the player determines to play the video.
The report of my death was an exaggeration - Mark Twain
Simply Elegant Designs JimmyRopes Designs
I'm on-line therefore I am.
JimmyRopes
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Johnny J. wrote: I tried rotating it using VLC player, but that just corrupted the file.
How can it corrupt a file if it doesn't write to it? (At least that's always been my assumption about VLC--why would a player ever need to *write* to a file?)
I personally would've used Tools|Effects and Filters|Video Effects|Geomatry|Transform (that's where you have all the flip/rotate options), but that only affects playback, it wouldn't change the original file otherwise. Are you claiming it does??
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dandy72 wrote: Are you claiming it does??
No. I used VLC player to rotate the movie and save it as a new movie. Since it was not my movie, but somebody else who had the problem - a person which as mentioned is computer illiterate, don't know how to use VLC player and just wanted to watch the movie in his Windows Media Player.
But the transformed and saved file was corrupt yes! The original was of course untouched (but also not corrected)
I don't think you read my post close enough to understand the problem... 
Anything that is unrelated to elephants is irrelephant
Anonymous
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The problem with quotes on the internet is that you can never tell if they're genuine
Winston Churchill, 1944
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I'd just like a chance to prove that money can't make me happy.
Me, all the time
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Johnny J. wrote: I don't think you read my post close enough to understand the problem...
The problem is that I didn't even realize VLC could apply transformations to a file, and actually *save* the results to a new one. In that case, then yeah, it absolutely makes sense that it could produce a corrupted file.
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You CAN[^]. Although I admit that it is not common knowledge.
I interpreted you post as though you thought it was I myself who just wanted to view the movie, though... And in that case it would of course suffice to rotate the output directly and not bother about the file.
Anything that is unrelated to elephants is irrelephant
Anonymous
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The problem with quotes on the internet is that you can never tell if they're genuine
Winston Churchill, 1944
-----
I'd just like a chance to prove that money can't make me happy.
Me, all the time
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Easy answer.
Do. Not. Record. Video. In. Portrait. Mode.
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I completely agree (and so does Tom Bergeron btw), but I didn't record it to start with and it's a little hard to fix in retrospect... As I mentioned: The person who did it shouldn't be let near electronic devices...
Anything that is unrelated to elephants is irrelephant
Anonymous
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The problem with quotes on the internet is that you can never tell if they're genuine
Winston Churchill, 1944
-----
I'd just like a chance to prove that money can't make me happy.
Me, all the time
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"Stand away from the phone!"
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So I tracked down this[^] to be ready when the ball drops. The countdown is still going and will run out in an hour and roughly 15 minutes, but the message already says "Support for Windows XP has ended".
Soren Madsen
"When you don't know what you're doing it's best to do it quickly" - Jase #DuckDynasty
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Northern California, 89 F, that's 32 C for your poor Europeans suffering over there.  And its 6:30 in the evening.
Have to say that coming after the three weeks of rain, the place is looking absoloutely stunning, green, lush, verdant, a deep blue sky, with wall to wall sun. And the chilled chardonnay isn't bad either!
"The whole idea that carbon dioxide is the main cause of the recent global warming is based on a guess that was proved false by empirical evidence during the 1990s." climate-models-go-cold
modified 8-Apr-14 22:42pm.
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You beat us by a bit. We topped out today at 38C (100.4F). The winds are out of the southwest which makes it feel a whole lot hotter.
We are getting some rain recently (first in 4 months) which has brought the temperature down a bit. A week ago we were getting 39C-40C (102F-104F) during the day.
The report of my death was an exaggeration - Mark Twain
Simply Elegant Designs JimmyRopes Designs
I'm on-line therefore I am.
JimmyRopes
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Thats Normal temperature here in Chennai, India..The Current temp is hovering around 36-38 and is expected to raise in the next few days!!!
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We have 14°C right now with wind. Forecast is 20°C (too high for the season).. And it's 7:20am..
The signature is in building process.. Please wait...
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Yeah, Europe isn't dong too bad this spring, we have seen snow at easter in France, where I live, before, but its hot 26 recently.
"The whole idea that carbon dioxide is the main cause of the recent global warming is based on a guess that was proved false by empirical evidence during the 1990s." climate-models-go-cold
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32°C?  Current weather in Vilnius, Lithuania: 7°C and sprinkles (08:57 AM)... 
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Munchies_Matt wrote: Northern California, 89 F, that's 32 C for your poor Europeans suffering over there.
Here is around 20 °C, and I don't miss your three weeks of rain. 
Veni, vidi, vici.
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In the middle of Germany we had about 4° C at 8:30 in the morning. But at least it's sunny. 
The good thing about pessimism is, that you are always either right or pleasently surprised.
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Eek, I also work in the middle of Germany on occasion. Is it really that cold still? Its was a nice summer last year though, very nice.
"The whole idea that carbon dioxide is the main cause of the recent global warming is based on a guess that was proved false by empirical evidence during the 1990s." climate-models-go-cold
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Light on Mars[^]
If you ignore the reference to the UFO site, it's pretty interesting.
".45 ACP - because shooting twice is just silly" - JSOP, 2010
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You can never have too much ammo - unless you're swimming, or on fire. - JSOP, 2010
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When you pry the gun from my cold dead hands, be careful - the barrel will be very hot. - JSOP, 2013
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Obviously it's a martian lighting its fart.
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