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use std::process::Command;
/// Options that ffmpeg supports but ffprobe does not.
const FFMPEG_ONLY_OPTIONS: &[&str] = &["-stream_loop", "-t"];
const ALPHA_FMTS: &[&str] = &[
"pal8",
"argb",
"rgba",
"abgr",
"bgra",
"yuva420p",
"ya8",
"yuva422p",
"yuva444p",
"yuva420p9be",
"yuva420p9le",
"yuva422p9be",
"yuva422p9le",
"yuva444p9be",
"yuva444p9le",
"yuva420p10be",
"yuva420p10le",
"yuva422p10be",
"yuva422p10le",
"yuva444p10be",
"yuva444p10le",
"yuva420p16be",
"yuva420p16le",
"yuva422p16be",
"yuva422p16le",
"yuva444p16be",
"yuva444p16le",
"rgba64be",
"rgba64le",
"bgra64be",
"bgra64le",
"ya16be",
"ya16le",
"gbrap",
"gbrap16be",
"gbrap16le",
"ayuv64le",
"ayuv64be",
"gbrap12be",
"gbrap12le",
"gbrap10be",
"gbrap10le",
"gbrapf32be",
"gbrapf32le",
"yuva422p12be",
"yuva422p12le",
"yuva444p12be",
"yuva444p12le",
"vuya",
"rgbaf16be",
"rgbaf16le",
"rgbaf32be",
"rgbaf32le",
"gbrap14be",
"gbrap14le",
"ayuv",
"uyva",
"rgba128be",
"rgba128le",
"gbrapf16be",
"gbrapf16le",
"yaf32be",
"yaf32le",
"yaf16be",
"yaf16le",
"gbrap32be",
"gbrap32le",
];
fn filter_probe_args(ff_args: &[String]) -> Vec<String> {
let mut out = Vec::new();
let mut skip_next = false;
for arg in ff_args {
if skip_next {
skip_next = false;
continue;
}
if FFMPEG_ONLY_OPTIONS.contains(&arg.as_str()) {
skip_next = true;
continue;
}
out.push(arg.clone());
}
out
}
pub struct VideoInfo {
pub width: u32,
pub height: u32,
pub num_frames: Option<u32>,
pub fps: f64,
pub alpha: bool,
pub codec_tag: String,
}
pub fn probe_video(ff_args: &[String], max_frames: Option<u32>) -> VideoInfo {
let probe_args = filter_probe_args(ff_args);
let output = Command::new("ffprobe")
.args(["-v", "error"])
.args(["-select_streams", "v:0"])
.args([
"-show_entries",
"stream=codec_tag_string,width,height,pix_fmt,r_frame_rate,nb_frames",
])
.args(["-of", "csv=p=0"])
.args(&probe_args)
.output()
.expect("failed to run ffprobe");
if !output.status.success() {
let stderr = String::from_utf8_lossy(&output.stderr);
panic!("ffprobe failed: {stderr}");
}
let stdout = String::from_utf8_lossy(&output.stdout);
let line = stdout.trim();
let parts: Vec<&str> = line.split(',').collect();
if parts.len() != 6 {
panic!("unexpected ffprobe output: {line}");
}
let codec_tag = parts[0].to_string();
let width: u32 = parts[1].parse().expect("parse width");
let height: u32 = parts[2].parse().expect("parse height");
let alpha = ALPHA_FMTS.contains(&parts[3]);
let fps: f64 = if let Some((num, den)) = parts[4].split_once('/') {
let n: f64 = num.parse().expect("parse fps numerator");
let d: f64 = den.parse().expect("parse fps denominator");
n / d
} else {
parts[4].parse().expect("parse fps")
};
let num_frames = parts[5].parse().ok().or(max_frames);
VideoInfo {
width,
height,
num_frames,
fps,
alpha,
codec_tag,
}
}
|
