Originally posted by : oile
Thanks a lot for anwering!! (I lost any hope of answers..)
Yes, obviously I am referring to the audio in video recording..
I sadly have to say that a 8000Hz AMR is simply not acceptable for a phone with "HD" in its name..
There would be the need to mount a more powerful microphone but if this cannot be done (however why not? ), I hope that final product will have at least a more decent AAC coding..
Out of this "lack" I hope that there is room for smoothness optimization in video recording, because 24fps are enough but from video samples it seems that we are @ 22-23 fps
Don't hate me please! I just want the i8910 to become the "new N95" i.e. a revolutionary smartphone in every aspect!
A little note: here in Italy INNOV8 16gb version never arrived ufficially...could you say a word about 16gb version availability in my country? (I know that it's not your job..)
Thanks!!
Hi Oile, I have discussed your questions with the camcorder team, and this is what they say:
1) You are right about camcorder sound, it is using AMR Narrow Band at 8000Hz 16 bit 2 channel 12.8 Kbps bit rate. There are several factors leading up to that decision, and as always there are trade-offs too - AMR is felt to be a better choice for human voice - using the AMR software codec they are also able to get better noise reduction - and using the software codec they get better management of the load using the ARM CPU.
Of course those judgements are based on the specific hardware/software platform combination, but the team feel it offered them the best quality solution.
2) Re frame rates, these are dynamic so you may see anything from the 22-23FPS you quote up to 30FPS depending on what's happening in a particular scene. Where there is a busy scene with lots of movement there is a lot of processing to do, and so the frame rate will be dropped to cope with that, a scene with less movement will maintain a higher FPS.
FPS also changes depending on the quality level the user chooses. This is quite a basic choice between high/medium/low quality - on a simple static scene I saw frame rates of 15FPS/1,038Kbps on the low setting and 30FPS/~2,058Kbps on med and high. Audio quality remained the same in all three cases.
The bottom line is that HD recording is a challenge, because there's a lot of data to process.
BTW, they pointed me to a great
free tool that allows you to analyse files in various recording formats. Maybe you know it, but it was news to me :-)
As another aside, I hope not too off-topic, I also found
this paper from TI really interesting.
Hope that helps.
Ben.
