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ffmpeg-sidecar 0.3.3

Wrap a standalone FFmpeg binary in an intuitive Iterator interface.
Documentation 
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use crate::{
  error::{Error, Result},
  event::FfmpegEvent,
  log_parser::FfmpegLogParser,
  paths::ffmpeg_path,
};
use std::process::{Command, Stdio};
use std::ffi::OsStr;

/// Alias for `ffmpeg -version`, parsing the version number and returning it.
pub fn ffmpeg_version() -> Result<String> {
  ffmpeg_version_with_path(ffmpeg_path())
}

/// Lower level variant of `ffmpeg_version` that exposes a customized the path
/// to the ffmpeg binary.
pub fn ffmpeg_version_with_path<S: AsRef<OsStr>>(path: S) -> Result<String> {
  let mut cmd = Command::new(&path)
    .arg("-version")
    .stdout(Stdio::piped()) // not stderr when calling `-version`
    .spawn()?;
  let stdout = cmd.stdout.take().ok_or("No standard output channel")?;
  let mut parser = FfmpegLogParser::new(stdout);

  let mut version: Option<String> = None;
  while let Ok(event) = parser.parse_next_event() {
    match event {
      FfmpegEvent::ParsedVersion(v) => version = Some(v.version),
      FfmpegEvent::LogEOF => break,
      _ => {}
    }
  }
  let exit_status = cmd.wait()?;
  if !exit_status.success() {
    return Err(Error::msg("ffmpeg -version exited with non-zero status"));
  }
  version.ok_or(Error::msg("Failed to parse ffmpeg version"))
}