Fix memory leak in nvmpi_enc, also add more cleanup to nvmipi dec/enc

[vietnx]

No description provided.

[wangtingbo]

@jocover ，I found the same problem,when use nvmpi_enc. I had fixed “nvmpi_encoder_close”，release ctx->packets[index]。

[GavinDarkglider]

@vietnx Just a thought on this, dpkg is a bad way to get version, much better to pull it from tegra version file in /etc. A lot of distros dont have dpkg, and this will completely break this on them. Also it is really dirty to be running external commands in the background in a lib. Where with a text file, it is open and parse. much faster, and clean. You also dont have to include/wait for extra threads.

[gjrtimmer]

This is addressed in the gjrtimmer/jetson-ffmpeg fork:

• Issue: encoder: thread-safety and lifecycle audit — packet-pool race, leaks, owning pointers (upstream jocover#130) gjrtimmer/jetson-ffmpeg#17
• Commit: 28584f9
• Fix: Replace plain bool cross-thread flags (capPlaneGotEOS, flushing) with std::atomic<bool> using acquire/release ordering. Adopt std::unique_ptr<NvVideoEncoder> for RAII ownership. Add NULL-check error handling in the FFmpeg encoder wrapper for encoder creation, packet pool init rollback, and drain loop OOM guard.
• Validated: smoke-all.sh 7/7 FFmpeg versions (4.2–8.0), hw-all all suites pass on Orin including new concurrent multi-stream encode stress suite