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Improve remux example #134

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Jan 6, 2024
Merged

Improve remux example #134

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64 changes: 41 additions & 23 deletions tests/remux.rs
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Original file line number Diff line number Diff line change
@@ -1,8 +1,26 @@
//! RIIR: https://github.com/FFmpeg/FFmpeg/blob/master/doc/examples/remux.c
use anyhow::{Context, Result};
use cstr::cstr;
use rsmpeg::avcodec::AVPacket;
use rsmpeg::avformat::{AVFormatContextInput, AVFormatContextOutput};
use rsmpeg::avutil::{ts2str, ts2timestr};
use rsmpeg::ffi::AVRational;
use std::ffi::CStr;

fn log_packet(time_base: AVRational, pkt: &AVPacket, tag: &str) {
println!(
"{}: pts:{} pts_time:{} dts:{} dts_time:{} duration:{} duration_time:{} stream_index:{}",
tag,
ts2str(pkt.pts),
ts2timestr(pkt.pts, time_base),
ts2str(pkt.dts),
ts2timestr(pkt.dts, time_base),
ts2str(pkt.duration),
ts2timestr(pkt.duration, time_base),
pkt.stream_index
);
}

fn remux(input_path: &CStr, output_path: &CStr) -> Result<()> {
let mut input_format_context = AVFormatContextInput::open(input_path, None, &mut None)
.context("Create input format context failed.")?;
Expand All @@ -11,22 +29,24 @@ fn remux(input_path: &CStr, output_path: &CStr) -> Result<()> {
.context("Dump input format context failed.")?;
let mut output_format_context = AVFormatContextOutput::create(output_path, None)
.context("Create output format context failed.")?;
let stream_mapping = {
let mut stream_mapping = vec![None; input_format_context.nb_streams as usize];
let mut stream_index = 0;
for (i, stream) in input_format_context.streams().into_iter().enumerate() {
let codec_type = stream.codecpar().codec_type();
if !codec_type.is_video() && !codec_type.is_audio() && !codec_type.is_subtitle() {
stream_mapping[i] = None;
continue;
}
stream_mapping[i] = Some(stream_index);
stream_index += 1;

let mut new_stream = output_format_context.new_stream();
new_stream.set_codecpar(stream.codecpar().clone());
}
stream_mapping
let stream_mapping: Vec<_> = {
let mut stream_index = 0usize;
input_format_context
.streams()
.into_iter()
.map(|stream| {
let codec_type = stream.codecpar().codec_type();
if !codec_type.is_video() && !codec_type.is_audio() && !codec_type.is_subtitle() {
None
} else {
output_format_context
.new_stream()
.set_codecpar(stream.codecpar().clone());
stream_index += 1;
Some(stream_index - 1)
}
})
.collect()
};
output_format_context
.dump(0, output_path)
Expand All @@ -41,11 +61,9 @@ fn remux(input_path: &CStr, output_path: &CStr) -> Result<()> {
.context("Read packet failed.")?
{
let input_stream_index = packet.stream_index as usize;
let output_stream_index = match stream_mapping[input_stream_index] {
Some(x) => x,
None => continue,
let Some(output_stream_index) = stream_mapping[input_stream_index] else {
continue;
};
let output_stream_index = output_stream_index as usize;
{
let input_stream = input_format_context
.streams()
Expand All @@ -55,19 +73,19 @@ fn remux(input_path: &CStr, output_path: &CStr) -> Result<()> {
.streams()
.get(output_stream_index)
.unwrap();
log_packet(input_stream.time_base, &packet, "in");
packet.rescale_ts(input_stream.time_base, output_stream.time_base);
packet.set_stream_index(output_stream_index as i32);
packet.set_pos(-1);
log_packet(output_stream.time_base, &packet, "out");
}
output_format_context
.interleaved_write_frame(&mut packet)
.context("Interleaved write frame failed.")?;
}

output_format_context
.write_trailer()
.context("Write trailer failed.")?;
Ok(())
.context("Write trailer failed.")
}

/// Remux MP4 to MOV, with h.264 codec.
Expand Down
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