From 92b119f95dd1cb24054f2440533208c140b66e46 Mon Sep 17 00:00:00 2001
From: metamuffin <metamuffin@disroot.org>
Date: Mon, 14 Apr 2025 13:52:16 +0200
Subject: fix duration from mkmeta in fragment

---
 remuxer/src/fragment.rs | 18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

diff --git a/remuxer/src/fragment.rs b/remuxer/src/fragment.rs
index 73fe046..0da1ed5 100644
--- a/remuxer/src/fragment.rs
+++ b/remuxer/src/fragment.rs
@@ -5,8 +5,10 @@
 */
 
 use crate::{
-    ebml_header, ebml_segment_info, ebml_track_entry, metadata::matroska_metadata,
-    seek_index::get_seek_index, segment_extractor::SegmentExtractIter,
+    ebml_header, ebml_segment_info, ebml_track_entry,
+    metadata::{matroska_metadata, MatroskaMetadata},
+    seek_index::get_seek_index,
+    segment_extractor::SegmentExtractIter,
 };
 use anyhow::{anyhow, Context, Result};
 use jellymatroska::{read::EbmlReader, write::EbmlWriter, Master, MatroskaTag};
@@ -18,11 +20,11 @@ use std::{
     path::Path,
 };
 
-const FRAGMENT_LENGTH: f64 = 2.;
+const FRAGMENT_LENGTH: f64 = 5.;
 
 pub fn fragment_index(path: &Path, track: u64) -> Result<Vec<Range<f64>>> {
     let meta = matroska_metadata(path)?;
-    let duration = meta.info.as_ref().unwrap().duration.unwrap();
+    let duration = media_duration(&meta);
     let force_kf = meta
         .as_ref()
         .tracks
@@ -87,7 +89,7 @@ pub fn write_fragment_into(
     n: usize,
 ) -> anyhow::Result<()> {
     let meta = matroska_metadata(path)?;
-    let duration = meta.info.as_ref().unwrap().duration.unwrap();
+    let duration = media_duration(&meta);
     let track_meta = meta
         .as_ref()
         .tracks
@@ -118,6 +120,7 @@ pub fn write_fragment_into(
     } else {
         index.keyframes.len()
     };
+    debug!("{duration} {n_kf}");
     let average_kf_interval = duration / n_kf as f64;
     let kf_per_frag = (FRAGMENT_LENGTH / average_kf_interval).ceil() as usize;
     debug!("average keyframe interval: {average_kf_interval}");
@@ -209,3 +212,8 @@ pub fn write_fragment_into(
     debug!("wrote {} bytes", output.position());
     Ok(())
 }
+
+fn media_duration(m: &MatroskaMetadata) -> f64 {
+    let info = m.info.as_ref().unwrap();
+    (info.duration.unwrap_or_default() * info.timestamp_scale as f64) / 1_000_000_000.
+}
-- 
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