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Other: Videos

Here you will find general considerations when compressing videos using any encoding/compression software. Additionally, we have included two tables with recommended compression settings for every format (H.264 and FLV).


General considerations


Optimize for streaming
This is very important, especially when compressing videos in H.264 format, look for an option to optimize (or prepare) the compressed videos for "streaming" or "fast start". If you don not encode your videos optimized for streaming, users won´t be able to watch them until they are fully downloaded. Videos optimized for streaming can be watched while they are being downloaded.

Deinterlace or not to deinterlace...
Internet (computer) is different from television, television displays videos in an interlaced way* and computers display videos in a progressive way*. If your source video is interlaced (most videos recorded by video cameras are) then you will need to deinterlace it before encoding it, or you can also use the deinterlace option that is built-in the majority of compression programs. If your source video is NOT interlaced, then the best thing to do is not to deinterlace it in order to produce a higher quality encoded video.

*More info about progressive vs interlaced video here:
Wikipedia: Progressinve scan
Wikipedia: Interlaced video

Recommended settings: compressing H.264/FLV

You will find two tables with recommended settings for compressing video in H.264 and FLV format. Generally, these settings produce very good quality videos (depending on the compression/encoding software being used).
Note: The following recommended settings should only be used as a starting point. Visible video quality also depends on the encoding software. We recommend to experiment with your tools and different settings until you get the desired results.

H.264
  WebTV Quality
Settings 500Kbps 700Kbps 1000Kbps 1250Kbps HD 720p
2000Kbps
HD 1080p
3500Kbps
Video Track  
Optimized for
Streaming / Fast start
Compression quality
High / Best - if available -
Frame reordering
Yes - if available -
Frame Rate
25 (PAL)
30 (NTSC)
Bitrate
450 kbits/sec 604 kbits/sec 904 kbits/sec 1122 kbits/sec 1902 kbits/sec 3378 kbits/sec
Dimensions
512 x 288 640 x 480 720 x 480 ( NTSC)
720 x 576 (PAL)
720 x 480 ( NTSC)
720 x 576 (PAL)
1280 x 720 1920 x 1080
Audio Track  
Format
AAC
Sample Rate
32, 44 or 48 kHz
Channels
Mono Stereo Stereo Stereo Stereo Stereo
Bit rate
48 kbps 96 kbps 96 kbps 128 kbps 128 kbps 128 kbps


FLV
  WebTV Quality
Settings 500Kbps 700Kbps 1000Kbps 1250Kbps 1500Kbps
Video Track  
Compressor / Encoding
On2 VP6
Compression quality
High - if available -
Frame Rate
25 (PAL)
30 (NTSC)
Bitrate
436 kbits/sec 636 kbits/sec 904 kbits/sec 1122 kbits/sec 1372 kbits/sec
Dimensions
320 x 240 512 x 288 640 x 480 720 x 480 ( NTSC)
720 x 576 (PAL)
720 x 480 ( NTSC)
720 x 576 (PAL)
Audio Track  
Format
MP3 (MPEG Layer III)
Sample Rate
32, 44 or 48 kHz
Channels
Mono Mono Stereo Stereo Stereo
Bit rate
64 kbps 64 kbps 96 kbps 128 kbps 128 kbps


 
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