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TAV: different filter for FPS up/downconversion

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This commit is contained in:
minjaesong
2025-12-17 02:06:36 +09:00
parent 71dff4b0e0
commit 1144338059
2 changed files with 87 additions and 31 deletions
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58
video_encoder/src/encoder_tav.c
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@@ -401,18 +401,35 @@ static int get_video_info(const char *input_file, int *width, int *height,
* - Filtergraph: scale/crop to full size, then tinterlace weave halves
* framerate, then separatefields restores framerate at half height
*
* When target_fps_num > 0:
* - Applies fps filter at the start to convert to target framerate
* Framerate conversion:
* - If target_fps > source_fps: uses minterpolate for motion interpolation
* - If target_fps < source_fps: uses fps filter for frame dropping
* - If target_fps == source_fps: no fps filter applied
*/
static FILE* open_ffmpeg_pipe(const char *input_file, int width, int height,
int interlaced, int full_height,
int target_fps_num, int target_fps_den) {
int target_fps_num, int target_fps_den,
int source_fps_num, int source_fps_den) {
char cmd[MAX_PATH * 2];
char fps_filter[64] = "";
char fps_filter[128] = "";
// Build fps filter string if conversion is requested (applied first)
if (target_fps_num > 0 && target_fps_den > 0) {
snprintf(fps_filter, sizeof(fps_filter), "fps=%d/%d,", target_fps_num, target_fps_den);
if (target_fps_num > 0 && target_fps_den > 0 &&
source_fps_num > 0 && source_fps_den > 0) {
// Compare framerates: target/1 vs source/1 -> target * source_den vs source * target_den
double target_rate = (double)target_fps_num / (double)source_fps_den;
double source_rate = (double)source_fps_num / (double)target_fps_den;
if (target_rate > source_rate) {
// Upsampling: use motion interpolation
snprintf(fps_filter, sizeof(fps_filter), "minterpolate=fps=%d/%d,",
target_fps_num, target_fps_den);
} else if (target_rate < source_rate) {
// Downsampling: use fps filter
snprintf(fps_filter, sizeof(fps_filter), "fps=%d/%d,",
target_fps_num, target_fps_den);
}
// If equal, fps_filter remains empty (no conversion needed)
}
if (interlaced) {
@@ -1439,7 +1456,9 @@ static int encode_video_mt(cli_context_t *cli) {
cli->interlaced,
cli->header_height,
cli->target_fps_num,
cli->target_fps_den);
cli->target_fps_den,
cli->original_fps_num,
cli->original_fps_den);
if (!cli->ffmpeg_pipe) {
return -1;
}
@@ -1905,7 +1924,9 @@ static int encode_video(cli_context_t *cli) {
cli->interlaced,
cli->header_height,
cli->target_fps_num,
cli->target_fps_den);
cli->target_fps_den,
cli->original_fps_num,
cli->original_fps_den);
if (!cli->ffmpeg_pipe) {
return -1;
}
@@ -2484,7 +2505,8 @@ int main(int argc, char *argv[]) {
fprintf(stderr, "Error: Invalid fps format. Use NUM or NUM/DEN\n");
return 1;
}
need_probe_fps = 0;
// Keep need_probe_fps = 1 so we always probe source fps
// (needed for minterpolate vs fps filter decision)
cli.target_fps_num = num;
cli.target_fps_den = den;
cli.enc_params.fps_num = num;
@@ -2647,11 +2669,13 @@ int main(int argc, char *argv[]) {
printf(" Resolution: %dx%d\n", cli.original_width, cli.original_height);
}
// Always print source framerate
printf(" Framerate: %d/%d\n", cli.original_fps_num, cli.original_fps_den);
// Use probed framerate if not specified by -f
if (need_probe_fps) {
if (cli.target_fps_num == 0) {
cli.enc_params.fps_num = cli.original_fps_num;
cli.enc_params.fps_den = cli.original_fps_den;
printf(" Framerate: %d/%d\n", cli.original_fps_num, cli.original_fps_den);
}
}
@@ -2671,11 +2695,19 @@ int main(int argc, char *argv[]) {
// Report fps conversion if enabled
if (cli.target_fps_num > 0 && cli.original_fps_num > 0) {
if (cli.target_fps_num != cli.original_fps_num || cli.target_fps_den != cli.original_fps_den) {
printf("Framerate conversion: %d/%d -> %d/%d\n",
long long target_rate = (long long)cli.target_fps_num * cli.original_fps_den;
long long source_rate = (long long)cli.original_fps_num * cli.target_fps_den;
if (target_rate > source_rate) {
printf("Framerate conversion: %d/%d -> %d/%d (minterpolate)\n",
cli.original_fps_num, cli.original_fps_den,
cli.target_fps_num, cli.target_fps_den);
} else if (target_rate < source_rate) {
printf("Framerate conversion: %d/%d -> %d/%d (fps)\n",
cli.original_fps_num, cli.original_fps_den,
cli.target_fps_num, cli.target_fps_den);
}
// If equal, no message needed (no conversion)
} else if (cli.target_fps_num > 0) {
printf("Output framerate: %d/%d\n", cli.target_fps_num, cli.target_fps_den);
}