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NTSC framerate detection

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This commit is contained in:
minjaesong
2025-09-03 11:08:37 +09:00
parent e73aa3da28
commit c89b977e91
4 changed files with 198 additions and 35 deletions
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14
video_encoder/encoder_tev.c
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@@ -162,6 +162,7 @@ typedef struct {
int has_subtitles;
int output_to_stdout;
int progressive_mode; // 0 = interlaced (default), 1 = progressive
int is_ntsc_framerate; // 1 if framerate denominator is 1001, 0 otherwise
int qualityIndex; // -q option
int qualityY;
int qualityCo;
@@ -1418,6 +1419,7 @@ static tev_encoder_t* init_encoder(void) {
enc->height = DEFAULT_HEIGHT;
enc->fps = 0; // Will be detected from input
enc->output_fps = 0; // No frame rate conversion by default
enc->is_ntsc_framerate = 0; // Will be detected from input
enc->verbose = 0;
enc->subtitle_file = NULL;
enc->has_subtitles = 0;
@@ -1531,7 +1533,7 @@ static int write_tev_header(FILE *output, tev_encoder_t *enc) {
uint8_t qualityCo = enc->qualityCo;
uint8_t qualityCg = enc->qualityCg;
uint8_t flags = (enc->has_audio) | (enc->has_subtitles << 1);
uint8_t video_flags = enc->progressive_mode ? 0 : 1; // bit 0 = is_interlaced (inverted from progressive)
uint8_t video_flags = (enc->progressive_mode ? 0 : 1) | (enc->is_ntsc_framerate ? 2 : 0); // bit 0 = is_interlaced, bit 1 = is_ntsc_framerate
uint8_t reserved = 0;
fwrite(&width, 2, 1, output);
@@ -1741,7 +1743,7 @@ static int get_video_metadata(tev_encoder_t *config) {
while (line && line_num < 2) {
switch (line_num) {
case 0: // Line format: "framerate,framecount" (e.g., "24000/1001,4423")
case 0: // Line format: "framerate,framecount" (e.g., "30000/1001,4423")
{
char *comma = strchr(line, ',');
if (comma) {
@@ -1750,8 +1752,10 @@ static int get_video_metadata(tev_encoder_t *config) {
int num, den;
if (sscanf(line, "%d/%d", &num, &den) == 2) {
config->fps = (den > 0) ? (int)round((float)num/(float)den) : 30;
config->is_ntsc_framerate = (den == 1001) ? 1 : 0;
} else {
config->fps = (int)round(atof(line));
config->is_ntsc_framerate = 0;
}
// Parse frame count (second part)
config->total_frames = atoi(comma + 1);
@@ -1778,7 +1782,11 @@ static int get_video_metadata(tev_encoder_t *config) {
fprintf(stderr, "Video metadata:\n");
fprintf(stderr, " Frames: %d\n", config->total_frames);
fprintf(stderr, " FPS: %d\n", config->fps);
if (config->is_ntsc_framerate) {
fprintf(stderr, " FPS: %.2f\n", config->fps * 1000.f / 1001.f);
} else {
fprintf(stderr, " FPS: %d\n", config->fps);
}
fprintf(stderr, " Duration: %.2fs\n", config->duration);
fprintf(stderr, " Audio: %s\n", config->has_audio ? "Yes" : "No");
fprintf(stderr, " Resolution: %dx%d (%s)\n", config->width, config->height,