Which video clips are more of high quality?

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#1 Posted by tinfanide (3 posts) -
Please beg my pardon if my question is confusing. I always wonder how to define a better (in terms of quality) video clip. Here are details of two video clips (same video clip but different video formats): Video clip 1: Format : AVI Format/Info : Audio Video Interleave File size : 127 MiB Duration : 15mn 1s Overall bit rate : 1 185 Kbps Writing library : VirtualDub build 32842/release Video #0 ID : 0 Format : MPEG-4 Visual Format profile : Advanced Simple@L5 Format settings, BVOP : 2 Format settings, QPel : No Format settings, GMC : No warppoints Format settings, Matrix : Default (H.263) Muxing mode : Packed bitstream Codec ID : XVID Codec ID/Hint : XviD Duration : 15mn 1s Bit rate : 1 047 Kbps Width : 624 pixels Height : 352 pixels Display aspect ratio : 16:9 Frame rate : 25.000 fps Color space : YUV Chroma subsampling : 4:2:0 Bit depth : 8 bits Scan type : Progressive Compression mode : Lossy Bits/(Pixel*Frame) : 0.191 Stream size : 113 MiB (88%) Writing library : XviD 1.2.1 (UTC 2008-12-04) Audio #1 ID : 1 Format : MPEG Audio Format version : Version 1 Format profile : Layer 3 Mode : Joint stereo Mode extension : MS Stereo Codec ID : 55 Codec ID/Hint : MP3 Duration : 15mn 1s Bit rate mode : Constant Bit rate : 128 Kbps Channel(s) : 2 channels Sampling rate : 48.0 KHz Compression mode : Lossy Stream size : 13.8 MiB (11%) Alignment : Split accross interleaves Interleave, duration : 40 ms (1.00 video frame) Interleave, preload duration : 500 ms Video clip 2: Format : MPEG-4 Format profile : Base Media Codec ID : isom File size : 85.6 MiB Duration : 15mn 0s Overall bit rate mode : Constant Overall bit rate : 797 Kbps Recorded date : UTC 2012-12-26 22:00:00 Tagged date : UTC 2012-12-27 03:56:16 Writing application : Lavf53.4.0 Video #1 ID : 1 Format : AVC Format/Info : Advanced Video Codec Format profile : Main@L3.0 Format settings, CABAC : Yes Format settings, ReFrames : 4 frames Codec ID : avc1 Codec ID/Info : Advanced Video Coding Duration : 15mn 0s Bit rate mode : Constant Bit rate : 700 Kbps Width : 640 pixels Height : 360 pixels Display aspect ratio : 16:9 Frame rate mode : Constant Frame rate : 25.000 fps Standard : PAL Color space : YUV Chroma subsampling : 4:2:0 Bit depth : 8 bits Scan type : Progressive Bits/(Pixel*Frame) : 0.122 Stream size : 74.9 MiB (87%) Audio #2 ID : 2 Format : AAC Format/Info : Advanced Audio Codec Format profile : HE-AAC / LC Codec ID : 40 Duration : 15mn 0s Bit rate mode : Constant Bit rate : 96.0 Kbps Channel(s) : 2 channels Channel positions : Front: L R Sampling rate : 48.0 KHz / 24.0 KHz Compression mode : Lossy Stream size : 10.2 MiB (12%)
#2 Posted by kraken2109 (13067 posts) -

Quality of a video depends on:

Codec/format

Bit-rate (bit rate x length in seconds = file size)

Resolution

You could just use your eyes

#3 Posted by tinfanide (3 posts) -
The bit rate can be seen, just numbers, which I can compare. How about the codec / format? Advanced Video Codec / MPEG-4 (Base Media) VS XVID / Audio Video Interleave (AVI) How about the resolution? Cannot see from the lists above.
#4 Posted by kraken2109 (13067 posts) -
[QUOTE="tinfanide"]The bit rate can be seen, just numbers, which I can compare. How about the codec / format? Advanced Video Codec / MPEG-4 (Base Media) VS XVID / Audio Video Interleave (AVI) How about the resolution? Cannot see from the lists above.

mp4 is generally better than avi for a given bit rate. You avi is 624x352, your mp4 is 640x360. I doubt there is a big difference, but in your case the avi is probably better due to the higher bit-rate, but it also has a larger file size because of this.
#5 Posted by tinfanide (3 posts) -
Oh, I see what to compare: 1. bit rate (kbps) 2. resolution (720x480) 3. video codec Just video codec is a bit complicated. Right? Thanks.
#6 Posted by kraken2109 (13067 posts) -
[QUOTE="tinfanide"]Oh, I see what to compare: 1. bit rate (kbps) 2. resolution (720x480) 3. video codec Just video codec is a bit complicated. Right? Thanks.

Basically yes