[rosbag2_compression] 压缩比超过阈值：10.5（最大 5.0）。包文件可能已损坏。
[rosbag2_compression] Compression ratio exceeded threshold: 10.5 (max 5.0). Bag file may be corrupted.
ID: ros2/rosbag2-compression-ratio-exceeded
版本兼容性
| 版本 | 状态 | 引入 | 弃用 | 备注 |
|---|---|---|---|---|
| Humble | active | — | — | — |
| Iron | active | — | — | — |
| Jazzy | active | — | — | — |
| Rolling | active | — | — | — |
根因分析
压缩算法（例如 zstd）生成的压缩文件大于未压缩数据，通常是由于不可压缩的数据（例如来自激光雷达或雷达等传感器的随机噪声）或配置错误的压缩级别。
English
The compression algorithm (e.g., zstd) produced a compressed file larger than the uncompressed data, often due to incompressible data (e.g., random noise from sensors like lidar or radar) or a misconfigured compression level.
官方文档
https://github.com/ros2/rosbag2/blob/humble/rosbag2_compression/README.md解决方案
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Increase the compression ratio threshold in the storage options: ros2 bag record -o my_bag --compression-mode file --compression-format zstd --compression-queue-size 100 --max-compression-ratio 20.0 /topic1 /topic2
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Filter out noisy topics (e.g., raw sensor data) from recording to avoid incompressible data: ros2 bag record -o my_bag --exclude '/noisy_lidar/.*' /important_topic
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Preprocess sensor data to reduce noise (e.g., downsampling or filtering) before recording, using a separate node that publishes filtered messages.
无效尝试
常见但无效的做法:
-
Increase the compression level to 22 (max for zstd)
70% 失败
Higher compression levels can make the ratio worse for incompressible data, as overhead increases.
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Disable compression entirely and store bags uncompressed
50% 失败
This solves the warning but defeats the purpose of using compression for storage efficiency.
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Change the compression format to 'lz4'
75% 失败
LZ4 is faster but has even worse compression ratios for incompressible data and may still trigger the warning.