Mtz
Well-Known Member
- Joined
- Nov 15, 2012
- Messages
- 4,387
- Reaction score
- 3,089
- Location
- Nice place
- Country
- Romania
- Dash Cam
- Viofo A229 Pro TeleQuad (the best dashcam in the world!)
First I want to say that "best" is not the real and correct word when is about video. So asking for the real best is most of the time useless, so you can use another words, like "better".
Just think when you had the DVD movies and you are thinking the best for you was an original DVD9. Now we have Blu-Ray, like Avatar. Tomorrow... 4K?
I think quality the recordings are because of: lens, light. compression algorithm or the user settings.
On my PC I have two sample videos from the same camera, but different firmwares and when looking at their parameters the values are different, depending on use.
Original screenshot size from my PC is here.
Always keep in mind this:
A higher resolution is not a higher quality, is just a resolution. HD is High Definition, not GHQ (Guraranteed High Quality) When is about the video you should think to the quantizer in this way:
- you have 1000 bytes for 1000 pixels. this is OK, you will see every pixel OK
- you have 1000 bytes for 2000 pixels. this is not OK because every pixel is trying to steal the byte from the neighborhood >> macroblocks, pixelation
- you have 2000 bytes for 1000 pixels. this is not OK because every pixel is over another one and not adding any value
Good quantizers are between 20 and 30, the smaller the better, but under 17 is almost useless.
So back on your dashcam: if you want smaller bitrate, and smaller size for videos use 720p.
But this will not guarantee you will not have macroblock because this is depending also on the compression algorithm, like profile used or CABAC, and your lens module quality.
So if you have the choice to use 1080p or 720p make the right decision.
The player used in the screenshots is the free Media Player Classic Home Cinema and the information about video files are provided by the free MediaInfo.
enjoy,
Mtz
Edit: The one with 17mbps is a hacked firmware which have a increased value from 7mbps to 17. But this hack can cause overheat and for sure big filesizes.
Just think when you had the DVD movies and you are thinking the best for you was an original DVD9. Now we have Blu-Ray, like Avatar. Tomorrow... 4K?
I think quality the recordings are because of: lens, light. compression algorithm or the user settings.
On my PC I have two sample videos from the same camera, but different firmwares and when looking at their parameters the values are different, depending on use.
Original screenshot size from my PC is here.
Always keep in mind this:
A higher resolution is not a higher quality, is just a resolution. HD is High Definition, not GHQ (Guraranteed High Quality) When is about the video you should think to the quantizer in this way:
- you have 1000 bytes for 1000 pixels. this is OK, you will see every pixel OK
- you have 1000 bytes for 2000 pixels. this is not OK because every pixel is trying to steal the byte from the neighborhood >> macroblocks, pixelation
- you have 2000 bytes for 1000 pixels. this is not OK because every pixel is over another one and not adding any value
Good quantizers are between 20 and 30, the smaller the better, but under 17 is almost useless.
So back on your dashcam: if you want smaller bitrate, and smaller size for videos use 720p.
But this will not guarantee you will not have macroblock because this is depending also on the compression algorithm, like profile used or CABAC, and your lens module quality.
So if you have the choice to use 1080p or 720p make the right decision.
The player used in the screenshots is the free Media Player Classic Home Cinema and the information about video files are provided by the free MediaInfo.
enjoy,
Mtz
Edit: The one with 17mbps is a hacked firmware which have a increased value from 7mbps to 17. But this hack can cause overheat and for sure big filesizes.