Commit 4e29a7cd authored by jan.koester's avatar jan.koester
Browse files

deb

parent 5c5b21b5

debian/changelog

+8 −0
Original line number Diff line number Diff line 
mediadb (20260424+77) unstable; urgency=medium



  * Performance: reduce prefetch block size 256KB→64KB, look-ahead 2MB→256KB,

    probesize 1MB→256KB, analyze duration 2s→1s. ~8× less cluster I/O

    before first frame decode; significantly faster video preview and seek.



 -- Jan Koester <jan.koester@tuxist.de>  Thu, 24 Apr 2026 00:00:00 +0200



mediadb (20260424+76) unstable; urgency=medium



  * Fix: remove render_pool_, run FFmpeg inline on HTTP worker threads.

src/preview.cpp

+4 −4
Original line number Diff line number Diff line
@@ -22,8 +22,8 @@ static std::string ff_err2str(int err) { 
 * benefit from previously fetched data.

 */

struct PrefetchBuffer {

    static constexpr std::size_t BLOCK_SIZE   = 256 * 1024;  // 256 KB — larger reads amortise cluster round-trips

    static constexpr std::size_t AHEAD_BLOCKS = 8;           // 8 blocks ahead = 2 MB look-ahead

    static constexpr std::size_t BLOCK_SIZE   = 64 * 1024;   // 64 KB — small blocks for fast initial decode

    static constexpr std::size_t AHEAD_BLOCKS = 4;           // 4 blocks ahead = 256 KB look-ahead



    MediaBackendApi* db;

    ThreadPool*      io_pool;   // bounded I/O pool (separate from render pool)
@@ -818,8 +818,8 @@ std::optional<PreviewResult> FFmpegPreviewer::render_streaming(MediaBackendApi& 
    format_ctx->flags |= AVFMT_FLAG_CUSTOM_IO;

    // Limit probing *before* open so format detection reads less data

    // over cluster I/O.

    format_ctx->probesize = 1024 * 1024;

    format_ctx->max_analyze_duration = 2 * AV_TIME_BASE;

    format_ctx->probesize = 256 * 1024;

    format_ctx->max_analyze_duration = 1 * AV_TIME_BASE;



    int rc = avformat_open_input(&format_ctx, nullptr, nullptr, nullptr);

    if (rc < 0) {