simple_converter

simple_converter

Transcodes a media file from H.264/AVC to H.265/HEVC using AVBlocks Transcoder with hardcoded input and output file paths.

This sample demonstrates the basic AVBlocks transcoding workflow:

1. Initialize the AVBlocks library
2. Create a MediaInfo object to probe the input file
3. Create an input MediaSocket from the probed media info
4. Create an output MediaSocket using a preset (MP4 / H.264 (AVC) + AAC) and change the video stream type to H.265 (HEVC)
5. Configure a Transcoder with the input and output sockets
6. Run the transcode operation

No command line parsing is used — the input and output file paths are hardcoded in the source code.

Building

From the repository root:

mkdir -p build/debug_x64
cd build/debug_x64
cmake -G 'Ninja' -DCMAKE_BUILD_TYPE=debug -DPLATFORM=x64 ../../samples
ninja

The built executable will be placed in bin/x64/simple_converter.

Running

1. Download the sample video:

   curl -L -o Wildlife_h264_aac.mp4 https://archive.org/download/WildlifeSampleVideo/Wildlife.mp4

2. Run the sample from the sample directory (the input/output file paths are relative to the working directory):

   cd samples/linux/simple_converter
   ../../../bin/x64/simple_converter

3. The transcoded output file Wildlife_h265_aac.mp4 will be created in the samples/linux/simple_converter directory.

Notes

• The input file Wildlife_h264_aac.mp4 and output file Wildlife_h265_aac.mp4 paths are hardcoded in simple_converter.cpp. They are relative to the working directory from which the executable is run.
• If transcoder->open() fails, it may be because Wildlife_h265_aac.mp4 already exists in the directory. Delete the output file and try again.
• The output uses the Preset::Video::Generic::MP4::Base_H264_AAC preset with the video stream type changed to StreamType::H265, producing an MP4 container with H.265 video and AAC audio streams.