trizist · July 2, 2025 23:40 · Feb 21, 2021 · Feb 21, 2021 · Nov 7, 2019 · Nov 7, 2019
diff --git a/main.rs b/main.rs
@@ -1,6 +1,6 @@
 /*
 
-Copyright 2021 cetra3
+Copyright 2021 https://github.com/cetra3/
 
 Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
 

diff --git a/main.rs b/main.rs
@@ -1,3 +1,15 @@
+/*
+
+Copyright 2021 cetra3
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+*/
+
 use std::error::Error;
 
 use std::path::{Path, PathBuf};

diff --git a/example.rs → main.rs b/example.rs → main.rs
diff --git a/example.rs b/example.rs
@@ -0,0 +1,154 @@
+use std::error::Error;
+
+use std::path::{Path, PathBuf};
+use structopt::StructOpt;
+
+use image::{ImageBuffer, Rgba};
+use std::time::Instant;
+
+use ffmpeg_next::ffi::AV_TIME_BASE;
+use ffmpeg_next::software::scaling::flag::BICUBIC;
+use ffmpeg_next::{decoder, format, frame, media, software::scaling, Error as FFMpegError};
+
+#[derive(StructOpt)]
+struct Opt {
+    #[structopt(parse(from_os_str))]
+    input: PathBuf,
+
+    /// Seek time in seconds
+    #[structopt(short = "t", long = "time", default_value = "0.0")]
+    seek_time: f64,
+
+    #[structopt(parse(from_os_str))]
+    output: PathBuf,
+}
+
+struct ImageIter {
+    input: format::context::Input,
+    stream_index: usize,
+    decoder: decoder::Video,
+    context: Option<scaling::Context>,
+}
+
+impl ImageIter {
+    fn new<I: AsRef<Path>>(path: I) -> Result<Self, Box<dyn Error>> {
+        let input = format::input(&path)?;
+
+        if let Some(stream) = input.streams().best(media::Type::Video) {
+            let stream_index = stream.index();
+
+            if let Ok(video) = stream.codec().decoder().video() {
+                println!("Video width:{}", video.width());
+                println!("Video format:{:?}", video.format());
+                println!("Video height:{}", video.height());
+
+                let mut context = None;
+
+                if video.format() != format::Pixel::RGBA {
+                    println!("Need to convert to RGBA");
+
+                    context = Some(scaling::Context::get(
+                        video.format(),
+                        video.width(),
+                        video.height(),
+                        format::Pixel::RGBA,
+                        video.width(),
+                        video.height(),
+                        BICUBIC,
+                    )?);
+                }
+
+                return Ok(Self {
+                    input,
+                    stream_index,
+                    decoder: video,
+                    context,
+                });
+            }
+        }
+
+        return Err(Box::new(FFMpegError::Unknown));
+    }
+
+    fn seek(&mut self, time_s: f64) -> Result<(), Box<dyn Error>> {
+        let timestamp = (time_s * AV_TIME_BASE as f64) as i64;
+
+        self.input.seek(timestamp, timestamp..)?;
+
+        Ok(())
+    }
+}
+
+pub fn get_ms(now: Instant) -> f32 {
+    let duration = now.elapsed();
+    let nanos = duration.subsec_nanos() as f32;
+    (1000000000f32 * duration.as_secs() as f32 + nanos) / (1000000f32)
+}
+
+impl Iterator for ImageIter {
+    type Item = Result<ImageBuffer<Rgba<u8>, Vec<u8>>, Box<dyn Error>>;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        let imagetime = Instant::now();
+        let mut output = frame::Video::empty();
+
+        while let Some((stream, packet)) = self.input.packets().next() {
+            if stream.index() != self.stream_index {
+                continue;
+            }
+
+            let decodetime = Instant::now();
+
+            if let Err(err) = self.decoder.decode(&packet, &mut output) {
+                return Some(Err(Box::new(err)));
+            }
+
+            println!("Image decode time: {}", get_ms(decodetime));
+
+            if output.format() == format::Pixel::None {
+                println!("Skipping null format frame");
+                continue;
+            }
+
+            if let Some(ref mut context) = self.context {
+                let convert_time = Instant::now();
+                let mut new_output = frame::Video::empty();
+
+                if let Err(err) = context.run(&output, &mut new_output) {
+                    return Some(Err(Box::new(err)));
+                }
+
+                println!("Image convert time: {}", get_ms(convert_time));
+
+                output = new_output;
+            }
+
+            let data = output.data(0).to_vec();
+
+            if let Some(image) =
+                ImageBuffer::<Rgba<u8>, _>::from_raw(output.width(), output.height(), data)
+            {
+                println!("Image read time: {}", get_ms(imagetime));
+                return Some(Ok(image));
+            }
+        }
+
+        None
+    }
+}
+
+fn main() -> Result<(), Box<dyn Error>> {
+    let opt = Opt::from_args();
+
+    let mut iter = ImageIter::new(opt.input)?;
+
+    iter.seek(opt.seek_time)?;
+
+    if let Some(image_result) = iter.next() {
+        let image = image_result?;
+
+        image.save(opt.output)?;
+    }
+
+    Ok(())
+}