Image, audio and video requirements

Please follow these guidelines to create image, audio and video files and ensure they are correctly uploaded and function well.

Image requirements

Compatible image formats:

  • .jpg
  • .png
  • .gif

One of the most frequent questions about images for websites has to do with when to use GIF or PNG image formats, and when to use JPEG. Here is a simple answer:  JPEG is used for photos and other images with millions of colors while PNG is used for all others except for animated images,then GIF format is used.

GIF(Extension .gif) For elements with few colors, simple drawings, animations and basically any image without gradients or mixtures. The GIF format allows showing images with clear backgrounds.  
PNG(Extension .png) PNG generally produces images with a better aspect with smaller file sizes than GIF for the same types of images with limited color. PNG images handle transparencies better.
JPEG(Extension .jpg or .jpeg) JPEG is the best format for complex and colorful images (like photographs), images containing gradients or mixtures of colors and any other image with millions of colors.

Video requirements

Compatible image formats:

  • .mp4

Codec: H.264

A codec is the format in which videos are coded. isEazy accepts the majority of the most important video codecs, but to obtain the best results we recommend using H.264. If you upload High Definition (HD), choose the High Profile configuration H.264 instead of Main Profile.

Frame rate

When preparing the video for uploading, it is better to maintain the native frame rate speed when sharing the video. If there is an option for key frame rates, choose the same value you used for the frame rate speed.

Note: Always choose a “constant” frame rate frequency instead of a “variable” frame rate speed.

Bit rate

The bit speed (also known as data rate) controls the visual quality of the video and its file size. If your video edition software allows you the option, choose a “variable” bit rate and then select a value for the ranges. You can experiment with different “rates” if your file is too large or you are not satisfied with the original file quality.

Quality Bit rate (kbit/s)
SD 2,000 – 5,000
720p 5,000 – 10,000
1080p 10,000 – 20,000
2K 20,000 – 30,000
4K 30,000 – 60,000

These are some of the most common formats regarding video resolution:

Format Resolution (px)
Standard Definition (SD)4:3 aspect ratio 640 × 480
Standard Definition (SD)16:9 aspect ratio 640 × 360
720p HD16:9 aspect ratio 1280 × 720
1080p HD16:9 aspect ratio 1920 × 1080
2K16:9 aspect ratio 2560 × 1440
4K16:9 aspect ratio 3840 × 2160

Audio requirements

Compatible audio formats:

  • .mp3
  • .aac

If your video format is different, you can convert it into one of the compatible formats using free on-line tools like media.ioOnline Audio Converter, etc.

Codec: AAC-LC (Advanced Audio Codec)

To obtain the best results, we recommend using AAC-LC (low complexity) for the audio codec.

Data rate: 320 kbit/s

To obtain the best results, codify your audio at a constant speed of 320 kbit/s.

Sample rate: 48 kHz

To obtain the best results, adjust the audio sampling frequency to 48 kHz. If its configuration is already less or equal to 48 kHz, do not modify it.

Continue reading  Requirements

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