Help Center / Compression guidelines
With these tips, you can optimize your files for upload on Djpod without affecting audio and / or video quality of your original file.
Audio
The best choice
- Codec: AAC (Advanced Audio Coding)
- The AAC codec provides better quality / bitrate ratio than MP3, which means that for the same file size, the sound will be better with the AAC codec than with the MP3 codec.
- Bitrate: 256 kbps
- An AAC file encoded at 128 kbps is equivalent to an MP3 file encoded at 192 kbps. If you want to reach the quality of an MP3 320 kbps, a bit rate of 256 is enough with AAC.
The other choice
- Codec: MP3 (MPEG-1/2 Audio Layer 3)
- Historically the most used of audio codecs, MP3 codec requires a high-speed (bitrate) to keep a good quality of sound.
- Bitrate: 320 kbps
- Many users encode at 128 kbps. But at this rate, an auditor with a good audio system will be aware of the sound compression. At 320 kbps, the quality is close to the original uncompressed file.
Video
The best choice
- Codec: H.264
- Codec developed under MPEG, H.264 is also known as AVC (Advanced Video Coding) and currently offers the best video compression without loss of quality.
- Frame rate: 24 fps
- Note that it is preferable to keep the frame rate at which you shoot.
- Resolution: 640px or 1280px wide (HD)
- For a low-resolution video, the most popular formats are 640x480 (4:3) and 640x360 (16:9). For HD video, 1280x720 (16:9) is the most common format.
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