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by zinekeller
2014 days ago
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The previous answers were speculative, but I have tried to download a random audio/video that was uploaded through YouTube's media programme (directly by media companies), and the answer is that they do re-send the video frame every 5 seconds for both H.264 and VP9, and it is encoded both at a rate of 25 frames per second and the width and height are the same. Here are the file details for both formats: H.264/AAC4: Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L3.2
Format settings : CABAC / 2 Ref Frames
Format settings, CABAC : Yes
Format settings, Reference frames : 2 frames
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 3 min 29 s
Bit rate : 375 kb/s
Width : 1 080 pixels
Height : 1 080 pixels
Display aspect ratio : 1.000
Frame rate mode : Constant
Frame rate : 25.000 FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.013
Stream size : 9.35 MiB (74%)
Writing library : x264 core 155 r2901 7d0ff22
Codec configuration box : avcC
Audio
ID : 2
Format : AAC LC
Format/Info : Advanced Audio Codec Low Complexity
Codec ID : mp4a-40-2
Duration : 3 min 29 s
Bit rate mode : Constant
Bit rate : 128 kb/s
Channel(s) : 2 channels
Channel layout : L R
Sampling rate : 44.1 kHz
Frame rate : 43.066 FPS (1024 SPF)
Compression mode : Lossy
Stream size : 3.19 MiB (25%)
Default : Yes
Alternate group : 1
VP9/Opus: Video
ID : 1
Format : VP9
Codec ID : V_VP9
Duration : 3 min 29 s
Width : 1 080 pixels
Height : 1 080 pixels
Display aspect ratio : 1.000
Frame rate mode : Constant
Frame rate : 25.000 FPS
Language : English
Default : Yes
Forced : No
Color range : Limited
Audio
ID : 2
Format : Opus
Codec ID : A_OPUS
Duration : 3 min 29 s
Channel(s) : 2 channels
Channel layout : L R
Sampling rate : 48.0 kHz
Bit depth : 32 bits
Compression mode : Lossy
Language : English
Default : Yes
Forced : No
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