use a more simple way to check if ffmpeg exists

Cargo.lock

@@ -132,12 +132,6 @@ dependencies = [
  "cfg-if 1.0.0",
 ]
 
-[[package]]
-name = "either"
-version = "1.6.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e78d4f1cc4ae33bbfc157ed5d5a5ef3bc29227303d595861deb238fcec4e9457"
-
 [[package]]
 name = "fastrand"
 version = "1.7.0"
@@ -170,7 +164,6 @@ dependencies = [
  "simplelog",
  "tokio",
  "walkdir",
- "which",
 ]
 
 [[package]]
@@ -1103,17 +1096,6 @@ version = "0.10.2+wasi-snapshot-preview1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "fd6fbd9a79829dd1ad0cc20627bf1ed606756a7f77edff7b66b7064f9cb327c6"
 
-[[package]]
-name = "which"
-version = "4.2.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5c4fb54e6113b6a8772ee41c3404fb0301ac79604489467e0a9ce1f3e97c24ae"
-dependencies = [
- "either",
- "lazy_static",
- "libc",
-]
-
 [[package]]
 name = "winapi"
 version = "0.2.8"

Cargo.toml

@@ -22,7 +22,6 @@ shlex = "1.1"
 simplelog = { version = "^0.11.2", features = ["paris"] }
 tokio = { version = "1.16.1", features = ["rt-multi-thread"] }
 walkdir = "2"
-which = "4.2.5"
 
 [target.x86_64-unknown-linux-musl.dependencies]
 openssl = { version = "0.10", features = ["vendored"] }

src/utils/mod.rs

@@ -14,7 +14,6 @@ use std::{
 
 use regex::Regex;
 use simplelog::*;
-use which::which;
 
 mod arg_parse;
 mod config;
@@ -350,9 +349,15 @@ pub async fn stderr_reader(std_errors: ChildStderr, suffix: String) -> Result<()
 }
 
 fn is_in_system(name: &str) {
-    // Check whether name is on PATH and marked as executable
-
-    if which(name).is_err() {
+    if let Ok(mut proc) = Command::new(name)
+        .stderr(Stdio::null())
+        .stdout(Stdio::null())
+        .spawn()
+    {
+        if let Err(e) = proc.wait() {
+            error!("{:?}", e)
+        };
+    } else {
         error!("{} not found on system!", name);
         exit(0x0100);
     }
@@ -403,6 +408,10 @@ fn ffmpeg_libs_and_filter() -> (Vec<String>, Vec<String>) {
         }
     }
 
+    if let Err(e) = ff_proc.wait() {
+        error!("{:?}", e)
+    };
+
     (libs, filters)
 }
 pub fn validate_ffmpeg() {