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Hey guys.
I've never seen this before. Yesterday I was recording 1080p video with my phone. Today I moved videos from memory card to pc. I noticed that the format of recorded files is 3gp! Instead of Mp4!
Why is it so?
Does it affect quality? I mean is 3gp more limited than mp4 in terms of video file details?7
How about audio quality? Mono vs stereo??
Is there any way to change that to mp4 ?
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I found this on Google:
Quote:Mp4 like 3gp is just the container. Actually the codec used for the video stream is the same as the one commonly used in mp4 files - h264. So the only benefit in recording in mp4 is compatibility, because mp4 is more widely spread across media players than 3gp.
So i don't think its that much to worry about.
Yes, 3GP is only a container, just like an AVI. DIVX/XVID relate to AVI the same way H264 relates to 3GP or MP4 containers. 3GP is "limited" only when talking about compatibility, as some cheaper media devices won't scan through the whole stream to check for the underlying format (which it might support), and instead it will give up as soon as it sees it's wrapped into the 3GP container. If you have such a case, there's plenty of converters online which can convert 3GP to MP4, even without recompressing the whole video (so no loss of picture quality). Regarding mono/stereo sound, I see that audio is encoded as stereo (48Khz, 192Kbit), but AFAIK, only the microphone on the back of the phone is active when recording videos? I'm not completely sure about that, but in case of an MP3 audio, the resulting 3GP filesize should not change, as mono audio stream is actualy compressed as stereo, but with two identical mono streams.
(2014-02-20, 16:24)Quad Wrote: [ -> ]I found this on Google:
Quote:Mp4 like 3gp is just the container. Actually the codec used for the video stream is the same as the one commonly used in mp4 files - h264. So the only benefit in recording in mp4 is compatibility, because mp4 is more widely spread across media players than 3gp.
So i don't think its that much to worry about.
(2014-02-20, 18:39)Burs Wrote: [ -> ]Yes, 3GP is only a container, just like an AVI. DIVX/XVID relate to AVI the same way H264 relates to 3GP or MP4 containers. 3GP is "limited" only when talking about compatibility, as some cheaper media devices won't scan through the whole stream to check for the underlying format (which it might support), and instead it will give up as soon as it sees it's wrapped into the 3GP container. If you have such a case, there's plenty of converters online which can convert 3GP to MP4, even without recompressing the whole video (so no loss of picture quality). Regarding mono/stereo sound, I see that audio is encoded as stereo (48Khz, 192Kbit), but AFAIK, only the microphone on the back of the phone is active when recording videos? I'm not completely sure about that, but in case of an MP3 audio, the resulting 3GP filesize should not change, as mono audio stream is actualy compressed as stereo, but with two identical mono streams.
thx guys for the helpful information . but why would they do that?? why don't they just set it on mp4 like any other high end device?? I don't get it why they try to be so "UNLIKE" in a useless way on some parts.... .
does it have anything to do with the mediatek CPUs or maybe GPU (maybe lack of encoding power while recording??)
(2014-02-21, 03:01)danyno1 Wrote: [ -> ]why don't they just set it on mp4 like any other high end device?? I don't get it why they try to be so "UNLIKE" in a useless way on some parts.... .
does it have anything to do with the mediatek CPUs or maybe GPU (maybe lack of encoding power while recording??)
It's not a lack of encoding power, because as we already said, 3gp is a container, or a wrapper if you will. The real underlying video/audio streams are the same ones found inside mp4 container, so there's really no loss of video quality or performance penalty between to two. Maybe it has something to do with licence rights? Maybe it was cheaper for them to implement arhaic 3gp support (which indeed does the job). Just guessing.