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better NTSC framerate handling

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minjaesong
2025-09-24 21:53:01 +09:00
parent 5564fa5c9b
commit d117b15e0f
1 changed files with 10 additions and 3 deletions
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13
video_encoder/encoder_tav.c
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@@ -3045,6 +3045,7 @@ int main(int argc, char *argv[]) {
// Main encoding loop - process frames until EOF or frame limit
int frame_count = 0;
int true_frame_count = 0;
int continue_encoding = 1;
int count_iframe = 0;
@@ -3172,10 +3173,10 @@ int main(int argc, char *argv[]) {
}
else {
// Process audio for this frame
process_audio(enc, frame_count, enc->output_fp);
process_audio(enc, true_frame_count, enc->output_fp);
// Process subtitles for this frame
process_subtitles(enc, frame_count, enc->output_fp);
process_subtitles(enc, true_frame_count, enc->output_fp);
// Write a sync packet only after a video is been coded
uint8_t sync_packet = TAV_PACKET_SYNC;
@@ -3183,8 +3184,13 @@ int main(int argc, char *argv[]) {
// NTSC frame duplication: emit extra sync packet for every 1000n+500 frames
if (enc->is_ntsc_framerate && (frame_count % 1000 == 500)) {
true_frame_count++;
// Process audio and subtitles for the duplicated frame to maintain sync
process_audio(enc, true_frame_count, enc->output_fp);
process_subtitles(enc, true_frame_count, enc->output_fp);
fwrite(&sync_packet, 1, 1, enc->output_fp);
printf("Frame %d: NTSC duplication - extra sync packet emitted\n", frame_count);
printf("Frame %d: NTSC duplication - extra sync packet emitted with audio/subtitle sync\n", frame_count);
}
if (is_keyframe)
@@ -3197,6 +3203,7 @@ int main(int argc, char *argv[]) {
swap_frame_buffers(enc);
frame_count++;
true_frame_count++;
enc->frame_count = frame_count;
if (enc->verbose || frame_count % 30 == 0) {