For <video> tag usage to embed mp4 video see after
Real stream at different bandwidth resolution and scanning
Because the <video> tag streams practically in progressive download (little portions of the
video sequentially copied from the server to the client), more that the embedded videos used in this page, to test the bandwidth would be useful to use
the following two true realtime streams (usually streamed in loop from this server) may be useful to test the real bandwidth of a website:
http://iginomanfre.it/HD_4000
4 Mbps 1080p25 h264
http://iginomanfre.it/x70_hevc_1200
1.3 Mbps 720p25 h265
Because browsers cannot play them, you must use VLC player: Media, Open Network Stream...
(In Italian: Media, Apri Flusso di Rete)
But sometimes the streaming engines could be down, so the streams could be not available.
After the sufficient bandwidth of the connection, a fluid reproduction depends also on the
capability of the device to decode and present it correctly: a dual core pc (eg: my Core2duo) could
not be able to decode an HD stream even receiving correctly all the packets.
It means that the 1.5 Mbps PAL embedded video could be played more fluently than the HD at 1 Mbps.
This is evidenced in embedded video that - practically - works in progressive download: a copy segment by segment from
the server to the device that - in order to be shown smoothly - must processed with a sufficient power.
In this page are embedded four versions of the same video streamed directly by Apache streaming server in progressive download and presented by the browser.
This tag allows the streaming only of mp4 and webm formats. The video must be declared video/mp4 type data.
The embedded videos are all avc+aac 720i interlaced (PAL), HD 1280x720p, HD 1920x1080p at two bitrates: 4 and 17 Mbps.
It is quite useless to embed a full size HD video within a webpage because the video size would often be greater than the mean displays.
So, after recalling them, please double click and it will open in full screen. (double click again to go back to the web page)
The standard call (shown here for the biggest one at 17 Mbps) is the following:
I shoot the video, 1 minute and 13 seconds long, with my smartphone on a bridge-bar on the A1 highway.
Despite the subject monotony, the vertical car movements force hardly the work of the encoder, deconder, and it is affected by any bandwidth bottleneck. The 17 Mbps of this video may severely affected by the connection bandwidth because the mean ADSL download bandwidth is about 10 Mbps.
Being a progressive download, the video is downloaded on a temp directory of the client and reproduced by the browser. Bandwidth bottlenecks will initially affect the fluency of the video, but after is has been download this will disappear (it is related to the chopping done bu apache).
The original video has been recompressed to many other sizes.
the bitrate evolution of this HD 17 Mbps mp4 video.
17 Mbps is a lot, even in progressive download and it is possible that
the player do not get enough material to insure a fluid reproduction
General
Complete name ..\video\autostrada_HD_17000.mp4
Format MPEG-4
Format profile Base Media
Codec ID isom (isom/iso2/avc1/mp41)
File size 149MiB
Duration 1 min 13s
Overall bit rate mode Variabile
Overall bit rate 17,1 Mb/s
Movie name autostrada.mp4
Encoded date UTC 1970-01-01 00:00:00
Tagged date UTC 1970-01-01 00:00:00
Writing application Lavf52.108.0
Video
ID 1
Format AVC
Format/Info Advanced Video Codec
Format profile High@L4
Format set, CABAC Yes
Format set, ReFrames 1 frame
Format set, GOP M=1, N=30
Codec ID avc1
Codec ID/Info Advanced Video Coding
Duration 1 min 13s
Bit rate 17,0 Mb/s
Width 1.920 pixel
Height 1.080 pixel
Display aspect ratio 16:9
Frame rate mode Constant
Frame rate 29,970 (29970/1000) FPS
Color space YUV
Chroma subsampling 4:2:0
Bit depth 8 bit
Scan type Progressive
Bits/(Pixel*Frame) 0.273
Stream size 148MiB (99%)
Encoded date UTC 1970-01-01 00:00:00
Tagged date UTC 1970-01-01 00:00:00
Audio
ID 2
Format AAC
Format/Info Advanced Audio Codec
Format profile LC
Codec ID 40
Duration 1 min 13s
Bit rate mode Variable
Bit rate 123 kb/s
Maximum bit rate 128 kb/s
Channel(s) 2 channels
Channel positions Front: L R
Sampling rate 48,0 kHz
Frame rate 46,875 FPS (1024 spf)
Compression mode lossy
Stream size 1,07MiB (1%)
Encoded date UTC 1970-01-01 00:00:00
Tagged date UTC 1970-01-01 00:00:00
the bitrate evolution of this HD 1920p mp4 video.
even 4 Mbps is a lot, and even here - when connected on mobile networks - in progressive
download and it is possible that the player do not get enough material to insure a fluid reproduction
General
Complete name ..\video\autostrada_1080p25_4Mbps.mp4
Format MPEG-4
Format profile Base Media
Codec ID isom (isom/iso2/avc1/mp41)
File size 31.3 MiB
Duration 1mn 13s
Overall bit rate mode Variable
Overall bit rate 3 599 Kbps
Writing application Lavf57.71.100
Video
ID 1
Format AVC
Format/Info Advanced Video Codec
Format profile High@L4
Format set, CABAC Yes
Format set, ReFrames 4 frames
Codec ID avc1
Codec ID/Info Advanced Video Coding
Duration 1mn 13s
Bit rate 3 500 Kbps
Width 1 920 pixels
Height 1 080 pixels
Display aspect ratio 16:9
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) 0.068
Stream size 30.5 MiB (97%)
Writing library x264 core 106
Encoding settings cabac=1 / ref=3 / deblock=1:0:0 / analyse=0x3:0x133 /
me=hex / subme=7 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 /
me_range=16 / chroma_me=1 / trellis=1 / 8x8dct=1 / cqm=0 /
deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 /
threads=3 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 /
constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=1 /
b_bias=0 / direct=1 / weightb=1 / open_gop=0 / weightp=2 /
keyint=250 / keyint_min=25 / scenecut=40 / intra_refresh=0 /
rc_lookahead=40 / rc=2pass / mbtree=1 / bitrate=3500 /
ratetol=1.0 / qcomp=0.60 / qpmin=10 / qpmax=51 / qpstep=4 /
cplxblur=20.0 / qblur=0.5 / ip_ratio=1.40 / aq=1:1.00
Audio
ID 2
Format AAC
Format/Info Advanced Audio Codec
Format profile C
Codec ID 40
Duration 1mn 2s
Bit rate mode Variable
Bit rate 102 Kbps
Maximum bit rate 128 Kbps
Channel(s) 2 channels
Channel positions Front: L R
Sampling rate 48.0 KHz
Frame rate 6.875 fps (1024 spf)
Compression mode Lossy
Stream size 781 KiB (2%)
Language unk
Default Yes
Alternate group 1
the bitrate evolution of this HD 1028p mp4 video.
General
Complete name ..\video\autostrada_720p_2Mbps_VBR.mp4
Format MPEG-4
Format profile Base Media
Codec ID isom (isom/iso2/avc1/mp41)
File size 9.77 MiB
Duration 1mn 12s
Overall bit rate mode Variable
Overall bit rate 1 124 Kbps
Writing application Lavf57.71.100
Video
ID 1
Format AVC
Format/Info Advanced Video Codec
Format profile High@L4.2
Format set, CABAC Yes
Format set, ReFrames 4 frames
Codec ID avc1
Codec ID/Info Advanced Video Coding
Duration 1mn 12s
Bit rate 1 015 Kbps
Nominal bit rate 2 000 Kbps
Width 1 280 pixels
Height 720 pixels
Display aspect ratio 16:9
Frame rate mode Variable
Frame rate 59.940 (59940/1000) fps
Minimum frame rate 39.963 fps
Maximum frame rate 119.889 fps
Original frame rate 119.890 fps
Color space YUV
Chroma subsampling 4:2:0
Bit depth 8 bits
Scan type Progressive
Bits/(Pixel*Frame) 0.018
Stream size 8.82 MiB (90%)
Writing library x264 core 106
Encoding settings cabac=1 / ref=3 / deblock=1:0:0 /
analyse=0x3:0x133 / me=hex / subme=7 /
psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 /
me_range=16 / chroma_me=1 / trellis=1 /
8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 /
chroma_qp_offset=-2 / threads=3 / sliced_threads=0 /
nr=0 / decimate=1 / interlaced=0 / constrained_intra=0 /
bframes=3 / b_pyramid=2 / b_adapt=1 / b_bias=0 /
direct=1 / weightb=1 / open_gop=0 / weightp=2 /
keyint=250 / keyint_min=25 / scenecut=40 / intra_refresh=0 /
rc_lookahead=40 / rc=2pass / mbtree=1 / bitrate=2000 /
ratetol=1.0 / qcomp=0.60 / qpmin=10 / qpmax=51 / qpstep=4 /
cplxblur=20.0 / qblur=0.5 / ip_ratio=1.40 / aq=1:1.00
Audio
ID 2
Format AAC
Format/Info Advanced Audio Codec
Format profile LC
Codec ID 40
Duration 1mn 8s
Bit rate mode Variable
Bit rate 102 Kbps
Maximum bit rate 128 Kbps
Channel(s) 2 channels
Channel positions Front: L R
Sampling rate 48.0 KHz
Frame rate 46.875 fps (1024 spf)
Compression mode Lossy
Stream size 854 KiB (9%)
Language unk
Default Yes
Alternate group 1
1080 interlaced 50 anamorphic1Mbps
coded with rhozet carbon coder
The profile of the bitrate may affect the reception and availability of info before the presentation
both streams have a mean bitrate of about 1Mbps,
but this one has 2.5 Mbps spikes!
As you can see Carbon Coder apply a smooth profiling of the stream.
Avidemux Option 1 encoder tab: adopting the anamorphysm the PAR must be modified accordingly
A lot can done more: if you haven't already seen, (this page is referred therein)
compare these result with what shown in only one way of streaming.html.
To know who is writing, click over the language you like
Per sapere qualcosa di chi scrive click-a sul linguaggio che preferisci
