Add hardsubs manually to download videos (#81)

crunchy-cli-core/src/utils/video.rs

@@ -0,0 +1,25 @@
+use anyhow::Result;
+use chrono::NaiveTime;
+use regex::Regex;
+use std::path::PathBuf;
+use std::process::{Command, Stdio};
+
+/// Get the length of a video. This is required because sometimes subtitles have an unnecessary entry
+/// long after the actual video ends with artificially extends the video length on some video players.
+/// To prevent this, the video length must be hard set. See
+/// [crunchy-labs/crunchy-cli#32](https://github.com/crunchy-labs/crunchy-cli/issues/32) for more
+/// information.
+pub fn get_video_length(path: PathBuf) -> Result<NaiveTime> {
+    let video_length = Regex::new(r"Duration:\s(?P<time>\d+:\d+:\d+\.\d+),")?;
+
+    let ffmpeg = Command::new("ffmpeg")
+        .stdout(Stdio::null())
+        .stderr(Stdio::piped())
+        .arg("-y")
+        .args(["-i", path.to_str().unwrap()])
+        .output()?;
+    let ffmpeg_output = String::from_utf8(ffmpeg.stderr)?;
+    let caps = video_length.captures(ffmpeg_output.as_str()).unwrap();
+
+    Ok(NaiveTime::parse_from_str(caps.name("time").unwrap().as_str(), "%H:%M:%S%.f").unwrap())
+}