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fix audio sync when being played by quicktime 

the thing I was doing is on the audio, i was setting the pts (presentation timestamp) after the frame was filtered by ffmpeg, which could be frames later, and could be batched.
i set the pts before filtering, but that made things worse. for some reason, the audio filter is remapping the pts I use (frame count, 1/60) to the time base 1/44100.
the video filter does not do this, which is why I specifically remap it later
I had to make that remap step I added later skip the audio channel
This commit is contained in:
Viv Lim 2021-07-28 23:54:40 -07:00
parent 7c03aac388
commit 3beb1a8519
1 changed files with 7 additions and 5 deletions
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10
examples/ffmpeg_recorder.rs
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@ -154,7 +154,7 @@ let wavname = Path::new("out.wav");
video_encoder.set_format(video_encoder.codec().unwrap().video().unwrap().formats().unwrap().nth(0).unwrap());
video_encoder.set_time_base(Rational::new(1, 60));
video_encoder.set_frame_rate(Some(Rational::new(60, 1)));
video_encoder.set_frame_rate(Some(Rational::new(fps_int, 1)));
//video_encoder.set_frame_rate(av_info.timing.fps.into());
@ -255,7 +255,9 @@ static bool ffmpeg_init_config(struct ff_config_param *params,
//if encoded_packet.size() > 0 {
encoded_packet.set_stream(stream_index);
eprintln!("📦 Writing packet, pts {:?} dts {:?} size {}", encoded_packet.pts(), encoded_packet.dts(), encoded_packet.size());
if stream_index == 0 {
encoded_packet.rescale_ts(Rational(1, 60), self.octx.stream(stream_index).unwrap().time_base());
}
eprintln!("📦 rescaled , pts {:?} dts {:?} size {}", encoded_packet.pts(), encoded_packet.dts(), encoded_packet.size());
match encoded_packet.write_interleaved(&mut self.octx) {
@ -314,6 +316,7 @@ static bool ffmpeg_init_config(struct ff_config_param *params,
);
aframe.set_channels(2);
aframe.set_rate(44100);
aframe.set_pts(Some(frame));
let aplane: &mut [(i16, i16)] = aframe.plane_mut(0);
eprintln!("Audio buffer length {} -> {}", self.audio_buf.len(), aplane.len());
aplane.copy_from_slice(self.audio_buf.as_ref());
@ -322,7 +325,6 @@ static bool ffmpeg_init_config(struct ff_config_param *params,
eprintln!("frame audio: {:?}", aframe);
//aframe.set_pts(Some(frame));
eprintln!("🎞 queue frame pts {:?}", aframe.pts());
self.audio_filter.get("in").unwrap().source().add(&aframe).unwrap();
@ -335,7 +337,7 @@ static bool ffmpeg_init_config(struct ff_config_param *params,
println!("🎥 failed to put filter input frame");
}
//let faplane: &[f32] = filtered_aframe.plane(0);
filtered_aframe.set_pts(Some(frame));
//filtered_aframe.set_pts(Some(frame));
self.audio_encoder.send_frame(&filtered_aframe).unwrap();
self.receive_and_write_packets(EncoderToWriteFrom::Audio);
@ -463,7 +465,7 @@ impl retro::wrapper::Handler for MyEmulator {
self.video_encoder.set_width(geometry.base_width);
self.video_encoder.set_height(geometry.base_height);
self.video_encoder.set_aspect_ratio(geometry.aspect_ratio as f64);
//self.video_encoder.set_aspect_ratio(geometry.aspect_ratio as f64);
self.av_info.geometry = geometry;
let pixel_format = match self.video_pixel_format {
format::Pixel::RGB555 => PixelFormat::ARGB1555,