Video compression
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Starting to explain who video compression works. It presents lot of historic points and relations with recents technologies.
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Audio encoding principles
Audio compression can be either lossless, which reduces file size while retaining all audio information, or lossy, which greatly reduces file size but decreases sound quality by losing some audio information. Common lossless formats are AIFF, WAV, and FLAC, while common lossy formats are MP3, AAC, and Vorbis. The quality and size of compressed audio files depends on factors like sample rate, bit depth, bit rate, and number of channels. Higher values for these factors generally mean higher quality audio but larger file sizes.
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Audio Compression Techniques
a type of lossy or lossless compression in which the amount of data in a recorded waveform is reduced to differing extents for transmission respectively with or without some loss of quality, used in CD and MP3 encoding, Internet radio.
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みなさんこんにちはこれ何文字まで入るの？40文字以下不可とか本当に意味わからないけどこれ限界文字数書いてないからマジでやばい文字数いけるんじゃないの？えこ...
ここ3000字までしか入らないけどタイトルの方がたくさん文字入ると思います。
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みなさんこんにちはこれ何文字まで入るの？40文字以下不可とか本当に意味わからないけどこれ限界文字数書いてないからマジでやばい文字数いけるんじゃないの？えこ...
みなさんこんにちはこれ何文字まで入るの？40文字以下不可とか本当に意味わからないけどこれ限界文字数書いてないからマジでやばい文字数いけるんじゃないの？えこ...
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Video compression
- 1. Video compression First step Marc-Antoine ARNAUD January 2015
- 3. Why ? Resolution Raw bit rate Compressed bit rate 720p * 69.1 MB/sec Prores422 HQ: 12.2 MB/sec Mpeg-2 High: 4.2 MB/sec HD * 155.5 MB/sec Prores422 HQ: 27.5 MB/sec Mpeg-2 High: 9.4 MB/sec 2K DCI ** 159.3 MB/sec JPEG2000: 15.6 MB/sec (2Kp48 = 31.25 MB/s) 4K DCI ** 637.0 MB/sec JPEG2000: 62.5 MB/sec * @ 25fps & 8bits/colour ** @ 24fps & 8bits/colour
- 4. Who to reduce data ? Increase the quantity of information* based on: - human perception - spatial information - temporal information Use binary coding tools * eq. maximize the entropy of the signal
- 9. Human Perception 4:4:4 4:2:2 4:1:1 4:2:0 Sub-sampling on YUV
- 10. Human Perception
- 13. Human Perception image 1:1 display 4:3 image 4:3 display 1:1 image 1:1 display 1:1 Pixel Aspect Ratio
- 14. Human Perception
- 18. Temporal information Group Of Picture = GOP
- 24. Spatial information Intra Frame Frame by frame encoding
- 25. Temporal information Predicted Frame - Use previous Intra or Predicted frames only
- 26. Temporal information Bidirectional Frame - Previous Intra frames - Previous Predicted frames - Next Predicted frames
- 30. Spatial information Quantification High frequencies reduction / suppression
- 32. Binary encoding Statistical approaches - Huffman (VLC - CAVLC) - arithmetic encoding (CABAC)
- 33. Binary encoding Huffman dictionary based on probabilities of symbols
- 34. Summary
- 38. Next steps - Mpeg 2 vs Mpeg 4 vs HEVC vs Prores - All about stereoscopic - Files formats (MXF, DCP, IMF...)