Right now I'm using the LG L7X P714 with stock but rooted Kitkat 4.4.2 firmware.
I can see that there are many options to record the phone's screen even if the rom is the stock, rooted or not. But no matter what app I try, and even after using the command from adb like developer.android says, which I suppose it has to work fine in every single terminal with Kitkat... it simply doesn't!
All I get is an mp4 file with pink and green lines.


What I do in adb is:

Code:

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$adb shell screenrecord /storage/external_SD/filename.mp4

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Also I tried modifying the values of "--size" and "--bit-rate" without success.

Code:

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$adb shell screenrecord --bit-rate 4000000 --size 420x800 /storage/
external_SD/prueba04.mp4

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The 420x800 are supposed to be the LG P714 screen dimensions.

I've read some things like let the phone use the hardware and not the software, or let it use GPU instead of CPU. I'm not sure but once I tried this app called Recordable and it's the ONLY app that allows me to record the screen.
When the option "Use Hardware" is activated:

THIS is how the mp4 looks like:

BUT if that option is not activated and the options are set to highest quality AND full screen resolution:

This is how the result looks like:


Resizing images seems impossible. Whatever.
So, yes, it is possible to record the screen but, how can I achieve that directly from my pc's adb in just one simple line like it is supposed to be??? What is wrong with the Use Hardware option? What else do I need here, logcat?