Convert Blf To Mf4 New

For engineers on a budget or requiring automation, the asammdf Python library is the industry standard for "new" conversions.

You need: Python 3.8+ installed.

The Script:

from asammdf import MDF
# Load the BLF file (asammdf handles BLF natively)
mdf_obj = MDF('your_logfile.blf')
# Convert and save as "new" MF4 (version 4.10)
mdf_obj.save('output_new_file.mf4', version='4.10')

Why this is best for "new": The version='4.10' flag forces the output to be the latest MF4 standard, including 64-bit timestamps and zipped channel groups.

Pros: Free, scriptable, runs on Linux servers. Cons: Requires Python setup; command-line only (no GUI). convert blf to mf4 new

| Tool | BLF size | MF4 size (compressed) | Time (min:sec) | RAM peak | |------|----------|----------------------|----------------|----------| | asammdf (Python) | 500 MB | 380 MB | 1:20 | 1.2 GB | | CANape (native) | 500 MB | 390 MB | 0:45 | 800 MB | | mdf4lib (C) | 500 MB | 370 MB | 0:28 | 450 MB | | PyViSim | 500 MB | 410 MB | 8:10 | 1.8 GB |

For files > 2 GB, use CANape or mdf4lib; asammdf may require chunked reading:

with MDF('large.blf') as mdf:
    mdf.export_to_mdf4('large.mf4', chunk_size=1000000)  # 1M records per chunk

This method is ideal if you have 500+ files to convert overnight.

Prerequisites: Install the library:

pip install asammdf

The Script:

from asammdf import MDF
For embedded systems or batch processing servers, the official ASAM MDF4 library (or the compatible mdf4lib) is best.
Steps:

Pseudocode:
#include "mdf4.h"
#include "xllapi.h"   // for BLF reading
int main() 
// Open BLF
XLblfOpen("log.blf", &blfHandle);
// Create MF4 file
MDF4_FILE* mdf = mdf4_create("out.mf4", MDF4_COMPRESSION_DEFLATE);
// Define a CAN bus group
mdf4_add_channel_group(mdf, "CAN_Bus", 0);
XLblfMessage msg;
while (XLblfReadNext(blfHandle, &msg)) 
    mdf4_write_can_frame(mdf, msg.timestamp, msg.id, msg.data, msg.dlc);
mdf4_close(mdf);
XLblfClose(blfHandle);
return 0;



Note: Actual API calls differ – check the respective library documentation. For engineers on a budget or requiring automation,


Verify with mf4 reader or ASAM-compliant viewer.

(Exact CLI depends on installed Vector package; consult local docs.)