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Mp3 And Mp4


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Mp3 And Mp4

  1. 1. Mp3 and Mp4
  2. 2. Agenda <ul><li>What is Mp3 </li></ul><ul><li>How it works </li></ul><ul><li>What is Mp4 </li></ul>
  3. 3. What is Mp3… <ul><li>Mp3 designed by the Moving Picture Experts Group </li></ul><ul><li>Mp3 is the acronym of MPEG-1 Audio Layer 3 </li></ul><ul><li>Digital Audio encoding format </li></ul>
  4. 4. Why we need to compress audio… <ul><li>The data on a CD uses an uncompressed, high-resolution format </li></ul><ul><li>44,100 samples/second * 16 bits/sample * 2 channels = 1,411,200 bits per second </li></ul><ul><li>So an average song consumes 32MB of space </li></ul>
  5. 5. <ul><li>The compression ratio of Mp3 is 12:1 </li></ul><ul><li>So, a 32MB song on a CD compresses down to about 3 MB. </li></ul>
  6. 6. How Mp3 achieves compression… <ul><li>Mp3 uses a technique called perceptual noise shaping. </li></ul><ul><li>We can choose how much information an MP3 file will retain or lose during the compression process. </li></ul><ul><li>The standard bit rate for MP3 files is 128 kbps, and this represents a good compromise between sound quality and file size. </li></ul>
  7. 7. Other Audio compression formats... <ul><li>MPEG2 Advanced Audio Coding (AAC) </li></ul><ul><li>WMA </li></ul><ul><li>OGG </li></ul><ul><li>RA </li></ul><ul><li>Lossless data compression formats: Apple Lossless Audio Codec (ALAC) , DTS-HD Master Audio, Dolby TrueHD </li></ul>
  8. 8. What is Mp4… <ul><li>Mp4 is the acronym of MPEG-4 Part 14 </li></ul><ul><li>Mp4 is Media Container format. </li></ul><ul><li>Used to store digital audio and digital video, especially those defined by MPEG, also used to store subtitles and still images. </li></ul><ul><li>File name extension: .mp4/.m4v/.m4a </li></ul>
  9. 9. <ul><li>Video: MPEG-4 Part 10 </li></ul><ul><li>Audio: Advanced Audio Coding (AAC),Mp3 </li></ul><ul><li>Subtitles: MPEG-4 Timed Text </li></ul>
  10. 10. Other Container formats… <ul><li>Microsoft ASF (Advanced System Format) </li></ul><ul><li>QuickTime .Mov format </li></ul><ul><li>Microsoft AVI format </li></ul>
  11. 11. Does MP4 mark the end of MP3?
  12. 12. Thank you!!