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Each iteration is a slightly different form, and in the process, you sometimes don’t pick the most mature generation. The majority of these options were early iterations on a timeline to a more mature generation.
Ffmpeg copy audio bitrate software#
“Once we gave the software more loads, directions and obstacles, we got to about 200 options. “The initial exploration resulted in about 300 options,” Harsuvanakit recalls. New forms generated by Dreamcatcher with the additional inputs were much more feasible for machining.Ĥ1% of DE survey respondents chose AI and machine learning as having the biggest impact on product design and development over the next 5 years.
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His choice of material was wood, and fabrication was CNC. To further reduce his design options for the Elbo Chair, Harsuvanakit used material and manufacturing requirements as guidance.
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But a chair is of considerable size, larger than the build chamber of most 3D printers. Now, smaller objects with odd geometric angles that might have been impossible to machine could easily be produced with 3D printers. As a designer, you learn to curate these forms, narrow them down by adding more constraints,” he notes. “The software gives you a lot more options-some of them you might not have even thought of on your own. The small brackets and desk lamps he designed using Dreamcatcher were his warm-up acts. How do you reframe subjective human preferences, such as comfort and aesthetics, as computable design parameters? Getting Comfortable with AIĪ senior designer in Autodesk’s Office of the CTO, Harsuvanakit had tinkered with algorithm-driven designs before. For both the designers and software developers, a new challenge has appeared on the horizon. More and more software vendors are now looking to incorporate AI-like features into their offerings. Generative design tools and algorithm-driven design projects are growing. For some, the new paradigm is AI-assisted design. The software then mathematically computes and recommends the best topologies or shapes based on these specifications. Instead of modeling a preconceived idea in the software, the designer provides the generative design software with requirements, such as where the object needs to withstand a load, what load or pressure is expected, what material choices are acceptable and so on. Generative design or algorithm-driven design turns this process on its head. When using a parametric 3D CAD modeling program, the design engineer typically uses his or her judgment, intuition and industry experience to come up with a concept, then digitally sculpt the shape in the software. Wegner’s Elbow Chair, which served as an inspiration for this project. The name came from the Danish Furniture Master Hans J. That was the digital genesis of what would later become the Elbo Chair, produced at Autodesk’s Pier 9 Workshop in San Francisco. “ I gave the software an elevated platform as input, then asked for all the different options to support it.” “I gave the software the absolute minimal input on what a chair is supposed to be,” explains Harsuvanakit. Replace the video bitrate -b:v 2M with -crf 23, for instance.Rendered views of the Elbo Chair, designed in Dreamcatcher using algorithms. Please read the H.264 encoding guide and the section on the Constant Rate Factor (CRF) for that. If you do not care about a specific file size, you should use a fixed-quality mode instead. MPEG-4 Part 10 video and AAC audio.Īlmost any codec allows you to set a specific bitrate, but many codecs have variable bitrate / fixed quality modes.
Ffmpeg copy audio bitrate mp4#
Choose the MP4 container as output, which will default to libx264 and aac encoders, i.e. You cannot use the original video and audio codecs (H.264 and AAC) here because they're not supported by AVI containers. For the AVI container this is the mpeg4 and libmp3lame encoder, respectively, so MPEG-4 Part II video and MP3 audio.
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See the H.264 encoding guide for more tips.įfmpeg selects a default video and audio codec for the chosen output extension. It's recommended to use a two-pass encoding mode if you want to target a certain bitrate. This will likely lead to wrong bitrate estimations for the video part. This is a simple one-pass encode that tries to reach the specified bitrate at the end. You can use abbreviations like K for kBit/s and M for MBit/s.įor example: ffmpeg -i input.mp4 -b:v 2M -b:a 192k output.mp4īut before you just run it like this, note the following: In order to specify the target bitrate for video and audio, use the -b:v and -b:a options, respectively.
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