Best flash video frame sizes iOS, ipad/iphone

Generally speaking, for the best video quality and playback the width and height dimensions of the video frame sizes should be a multiple of 16 (best), 8 (better), or 4 (good). This applies to Video On Demand as well as Live streaming.

Silverlight Smooth Streaming HTML 5 support- video frame sizes Android support - video frame sizes Apple iPhone support- video frame sizes Flash FLV, MP4 support Blackberry support



If you are pushing a live stream using Adobe Flash Media Encoder for use with iOS devices we suggest using frame sizes of 640 x 360 or 480 x 272 for 16:9 aspect ratio. For 4:3 we recommend 640 x 480 or 480 x 360. The video (deinterlaced) should be H.264 baseline level 3.0 to cover the most devices along with AAC audio and not MP3. Key Frame every 1 or 2 seconds. For lower bit rates use a frame rate of 15. N.B: A delay in playback is normal with iPad and iPhone. Apple recommend that an audio sample rate of 22.05 kHz and audio bit rate of 40 kbps is recommended in all cases. We find results are good with bit rates up to 64 kbps, 44.1 or 48 kHz provided that this is not more than 10% of the video bit rate .

The tables below are the video frame sizes settings recommended by Apple who require the video width to be 480 or 640:

Table 2-1  Encoder settings for iPhone, iPod touch, iPad, and Apple TV, 16:9 aspect ratio

Connection

Dimensions

Total

bit rate

Video

bit rate

Keyframes

Cellular

480 x 320

64 kpbs

audio only

none

Cellular

480 x 224

150 kpbs

110 kbps

30

Cellular

480 x 224

240 kpbs

200 kbps

45

Cellular

480 x 224

440 kpbs

400 kbps

90

WiFi

640 x 360

640 kpbs

600 kbps

90

Table 2-2  Encoder settings for iPhone, iPod touch, iPad, and Apple TV, 4:3 aspect ratio

Connection

Dimensions

Total

bit rate

Video

bit rate

Keyframes

Cellular

480 x 320

64 kpbs

audio only

none

Cellular

480 x 300

150 kpbs

110 kbps

30

Cellular

480 x 300

240 kpbs

200 kbps

45

Cellular

480 x 300

440 kpbs

400 kbps

90

WiFi

640 x 480

640 kpbs

600 kbps

90


Table 2-3  Additional encoder settings for iPad and Apple TV only, 16:9 aspect ratio

Connection

Dimensions

Total

bit rate

Video

bit rate

Keyframes

WiFi

640 x 360

1240 kpbs

1200 kbps

90

WiFi

960 x 540

1840 kpbs

1800 kbps

90

WiFi

1280 x 720

2540 kpbs

1500 kbps

90

WiFi

1280 x 720

4540 kpbs

4500 kbps

90


Table 2-4  Additional encoder settings for iPad and Apple TV only, 4:3 aspect ratio

Connection

Dimensions

Total

bit rate

Video

bit rate

Keyframes

WiFi

640 x 480

1240 kpbs

1200 kbps

90

WiFi

960 x 720

1840 kpbs

1800 kbps

90

WiFi

960 x 720

2540 kpbs

2500 kbps

90

WiFi

1280 x 960

4540 kpbs

4500 kbps

90



For further information about video frame sizes see also:

Multi Protocol Streaming Delivery

Supported Video Devices

Mobile Streaming Troubleshooting

Live Video Streaming WEB TV

 

 

 

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