IEC61937 13 encoder example
The iec61937-13 repository provides a command-line program as an example to encode MPEG-H Audio bitstream into IEC61937-13 data burst format.
The example program:
- takes a MP4 file, containing a MPEG-H audio track, as input and extracts the MPEG-H Audio frames from MP4 file format (using the mmtisobmff project).
- encodes the extracted MPEG-H Audio frames to the IEC data bursts
- stores the encoded IEC data bursts into a file (IEC raw format).
To build the IEC61937-13 encoder command-line example program set iec61937-13_BUILD_BINARIES variable while configuring the project using CMake :
$ cmake -S iec61937-13 -B build -DCMAKE_BUILD_TYPE=Release -Diec61937-13_BUILD_BINARIES=True
Read build instructions to learn how to configure and build the project.
If build process is successfully finished, the IEC61937-13 encoder command-line tool iec61937-13_encoder can be found:
- in the build/bin folder
- in the build/bin/Release folder on Windows
$ build/bin/iec61937-13_encoder <path to input file> <path to output file> <samplerate factor> <swap byte order flag>
- <path to input file>
- relative or absolute path to an input MP4 file containing MPEG-H audio track (in MHM1 format) to encode.
- <path to output file>
- relative or absolute path to an output file which will contain the encoded IEC data bursts.
- <samplerate factor>
- IEC61937-13 sampling rate factor (4 or 16)
- <swap byte order flag>
- allows to pairwise swap the IEC data burst output (1 to swap pairwise, 0 to keep the byte order)
- NOTE: the default byte order is Big-Endian
To test MPEG-H decoding with the provided command-line program example or with your own implementation please use test material from test content repository.
Additionally you can:
- visit the MPEG-H homepage to get further test material and information about Fraunhofer MPEG-H trademark program.
- create your own test content using the MPEG-H Authoring Suite.
Example to test IEC61937-13 encoding for the file provided in test content repository:
$ build/bin/iec61937-13_encoder TRI_Fileset_17_514H_D1_D2_D3_O1_24bit2160p50.audio.mp4 out.raw 4 0
Example above:
- takes the TRI_Fileset_17_514H_D1_D2_D3_O1_24bit2160p50.audio.mp4 test item as input.
- sets the IEC61937-13 sampling rate factor to 4x
- keeps the byte order (no byte swapping)
- writes the encoded IEC data bursts to out.raw file.
You can verify the created IEC data bursts file:
- using the IEC61937-13 decoder
- using the Linux OS HDMI playback instructions
- Only the first MPEG-H Audio track will be processed, other MPEG-H Audio tracks will be ignored/skipped.
- Other tracks than MPEG-H Audio track will be ignored/skipped.