| Linking libstdc++ statically | |
| Christopher Baus writes about his problems linking libstdc++ statically. Yes, making C++ binaries that will work properly in different Linux distributions is somewhat painful. The problem is not so much linking libstdc++ statically – it is just a library, after all – but the runtime support required by C++ code in general, to enable features like RTTI and exception handling. | |
| The runtime support code used by different parts of a C++ application needs to be compatible. If one part of the program needs to dynamic_cast or catch objects provided by another, both parts must agree on certain implementation details: how to find vtables, how to unwind the stack, and so on. | |
| For C++ and a few other GCC-supported languages with similar features, such details are specified by a C++ ABI. Whenever the ABI used by GCC changes you'll end up with incompatible libraries produced by the different GCC versions. The same is true for plain C, but the C ABI is much simpler and has been around a lot lon |
Minimal example: transcode from MP3 to WMA:
ffmpeg -i input.mp3 output.wma
You can get the list of supported formats with:
ffmpeg -formats
Convert WAV to MP3, mix down to mono (use 1 audio channel), set bit rate to 64 kbps and sample rate to 22050 Hz:
| #!/usr/bin/env python3 | |
| # Copyright (c) 2021 Xiaomi Corporation (authors: Fangjun Kuang) | |
| from snowfall.training.ctc_graph import build_ctc_topo2 | |
| from speechbrain.pretrained import EncoderDecoderASR | |
| import k2 | |
| import torch |
For a brief user-level introduction to CMake, watch C++ Weekly, Episode 78, Intro to CMake by Jason Turner. LLVM’s CMake Primer provides a good high-level introduction to the CMake syntax. Go read it now.
After that, watch Mathieu Ropert’s CppCon 2017 talk Using Modern CMake Patterns to Enforce a Good Modular Design (slides). It provides a thorough explanation of what modern CMake is and why it is so much better than “old school” CMake. The modular design ideas in this talk are based on the book [Large-Scale C++ Software Design](https://www.amazon.de/Large-Scale-Soft
| // author: fangjun kuang <csukuangfj at gmail dot com> | |
| // date: Apr. 22, 2019 | |
| // refer to http://www.topherlee.com/software/pcm-tut-wavformat.html | |
| #include <fstream> | |
| #include <iostream> | |
| typedef struct WAV_HEADER { | |
| /* RIFF Chunk Descriptor */ |
| - a blog article https://colah.github.io/posts/2015-08-Understanding-LSTMs/ |
import tensorflow as tf
tf.logging.set_verbosity(tf.logging.ERROR)