Compromise: Quality Vs. Resolution
- 1. Perfect MPEG-4 Video: Resolution, Data Rate And Picture Quality
- 2. Optimization Of Flask Mpeg: Intel And AMD CPUs
- 3. Choice Of The MPEG-4-Codec: Fast Vs. Slow Motion, Continued
- 4. Focus On The MPEG-4 Fast Motion Codec
- 5. Focus On The MPEG-4 Fast Motion Codec, Continued
- 6. Low Resolutions: Better With Slow Motion Codec!
- 7. Compromise: Quality Vs. Resolution
7. Compromise: Quality Vs. Resolution
| Resolution | Bitrate Video MPEG-4 | Data Rate Audio | Overall | Quality | Length of Film CD-R 74 | Length of Film CD-R 80 | Length of Film CD-R 99 |
|---|---|---|---|---|---|---|---|
| Video | Fast-Motion-Codec | Fraunhofer Codec | Data Rate | Burn to CD-R | Burn to CD-R | Burn to CD-R | |
| 176 x 112 Pixels | adaptive, max. 6000 kBit/s | 128 kBit/s, 44 KHz, Stereo | 37 kB/s | very good | 300 min | 323 min | 370 min |
| 240 x 192 Pixels | adaptive, max. 6000 kBit/s | 128 kBit/s, 44 KHz, Stereo | 45 kB/s | very good | 247 min | 266 min | 303 min |
| 352 x 224 Pixels | adaptive, max. 6000 kBit/s | 128 kBit/s, 44 KHz, Stereo | 70 kB/s | very good | 159 min | 171 min | 195 min |
| 480 x 288 Pixels | adaptive, max. 6000 kBit/s | 128 kBit/s, 44 KHz, Stereo | 94 kB/s | very good | 118 min | 127 min | 145 min |
| 576 x 336 Pixels | adaptive, max. 6000 kBit/s | 128 kBit/s, 44 KHz, Stereo | 109 kB/s | very good | 102 min | 110 min | 125 min |
| 640 x 480 Pixels | adaptive, max. 6000 kBit/s | 128 kBit/s, 44 KHz, Stereo | 129 kB/s | very good | 86 min | 93 min | 106 min |
| 720 x 416 Pixels | adaptive, max. 6000 kBit/s | 128 kBit/s, 44 KHz, Stereo | 145 kB/s | very good | 77 min | 83 min | 94 min |
This table shows the increase in the data rate depending on the chosen codec and the respective resolution. Furthermore, instructions are given for writing a DVD video onto a CD-ROM depending on the respective CD-R.
Especially in the case of DVD videos that have a playing time of more than 90 minutes, it is often the case that the storage capacity of a CD-ROM with just under 700 MB (CD-R80) is not sufficient. In order to avoid having to split the DVD video onto two CD-ROMs the average data rate should be reduced when carrying out the MPEG-4 encoding. In principle, there are two different ways of doing this. On the one hand, the resolution can be slightly reduced or, on the other hand, you have to marginally sacrifice picture quality, so that the data rate is lowered with a consistent resolution.
The following screenshots taken from our test sequences show the extent to which the different resolutions affect the average data rates.
All three video sequences were prepared with the slow motion codec and different bit rates. While the lowest resolution only requires 250 kBit/s, the resolution with 352 x 224 pixels needs as much as 700 kBit/s.
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