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Transcript

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