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more efficient metadata fetch

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This commit is contained in:
minjaesong
2025-08-28 10:38:10 +09:00
parent 4276dfd4f0
commit 3989f409f7
1 changed files with 52 additions and 68 deletions
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120
video_encoder/encoder_tev.c
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@@ -1397,90 +1397,73 @@ static char *execute_command(const char *command) {
}
// Get video metadata using ffprobe
static int get_video_metadata(tev_encoder_t *enc) {
static int get_video_metadata(tev_encoder_t *config) {
char command[1024];
char *output;
// Get frame count
// Get all metadata in a single ffprobe call
snprintf(command, sizeof(command),
"ffprobe -v quiet -select_streams v:0 -count_frames -show_entries stream=nb_read_frames -of csv=p=0 \"%s\"",
enc->input_file);
output = execute_command(command);
if (!output) {
fprintf(stderr, "Failed to get frame count\n");
return 0;
}
enc->total_frames = atoi(output);
free(output);
"ffprobe -v quiet -count_frames "
"-show_entries stream=nb_read_frames,r_frame_rate:format=duration "
"-select_streams v:0 -of csv=p=0 \"%s\" 2>/dev/null; "
"ffprobe -v quiet -select_streams a:0 -show_entries stream=index -of csv=p=0 \"%s\" 2>/dev/null",
config->input_file, config->input_file);
// Get original frame rate (will be converted if user specified different FPS)
snprintf(command, sizeof(command),
"ffprobe -v quiet -select_streams v:0 -show_entries stream=r_frame_rate -of csv=p=0 \"%s\"",
enc->input_file);
output = execute_command(command);
if (!output) {
fprintf(stderr, "Failed to get frame rate\n");
fprintf(stderr, "Failed to get video metadata\n");
return 0;
}
int num, den;
if (sscanf(output, "%d/%d", &num, &den) == 2) {
enc->fps = (den > 0) ? (int)round((float)num/(float)den) : 30;
} else {
enc->fps = (int)round(atof(output));
// Parse the combined output
char *line = strtok(output, "\n");
int line_num = 0;
while (line && line_num < 2) {
switch (line_num) {
case 0: // Line format: "framerate,framecount" (e.g., "24000/1001,4423")
{
char *comma = strchr(line, ',');
if (comma) {
*comma = '\0'; // Split at comma
// Parse frame rate (first part)
int num, den;
if (sscanf(line, "%d/%d", &num, &den) == 2) {
config->fps = (den > 0) ? (int)round((float)num/(float)den) : 30;
} else {
config->fps = (int)round(atof(line));
}
// Parse frame count (second part)
config->total_frames = atoi(comma + 1);
}
}
break;
case 1: // duration in seconds
config->duration = atof(line);
break;
}
line = strtok(NULL, "\n");
line_num++;
}
// Check for audio stream (will be on line 3 if present)
config->has_audio = (line && strlen(line) > 0 && atoi(line) >= 0);
free(output);
// If user specified output FPS, calculate new total frames for conversion
if (enc->output_fps > 0 && enc->output_fps != enc->fps) {
// Calculate duration and new frame count
snprintf(command, sizeof(command),
"ffprobe -v quiet -show_entries format=duration -of csv=p=0 \"%s\"",
enc->input_file);
output = execute_command(command);
if (output) {
enc->duration = atof(output);
free(output);
// Update total frames for new frame rate
enc->total_frames = (int)(enc->duration * enc->output_fps);
if (enc->verbose) {
printf("Frame rate conversion: %d fps -> %d fps\n", enc->fps, enc->output_fps);
printf("Original frames: %d, Output frames: %d\n",
(int)(enc->duration * enc->fps), enc->total_frames);
}
enc->fps = enc->output_fps; // Use output FPS for encoding
}
// Validate frame count using duration if needed
if (config->total_frames <= 0 && config->duration > 0) {
config->total_frames = (int)(config->duration * config->fps);
}
// set keyframe interval
KEYFRAME_INTERVAL = 2 * enc->fps;
fprintf(stderr, "Video metadata:\n");
fprintf(stderr, " Frames: %d\n", config->total_frames);
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\n", config->width, config->height);
// Calculate target bits per frame for bitrate mode
if (enc->target_bitrate_kbps > 0) {
enc->target_bits_per_frame = (enc->target_bitrate_kbps * 1000) / enc->fps;
if (enc->verbose) {
printf("Target bitrate: %d kbps (%zu bits per frame)\n",
enc->target_bitrate_kbps, enc->target_bits_per_frame);
}
}
// Check for audio stream
snprintf(command, sizeof(command),
"ffprobe -v quiet -select_streams a:0 -show_entries stream=codec_type -of csv=p=0 \"%s\" 2>/dev/null",
enc->input_file);
output = execute_command(command);
enc->has_audio = (output && strstr(output, "audio"));
if (output) free(output);
if (enc->verbose) {
fprintf(stderr, "Video metadata:\n");
fprintf(stderr, " Frames: %d\n", enc->total_frames);
fprintf(stderr, " FPS: %d\n", enc->fps);
fprintf(stderr, " Audio: %s\n", enc->has_audio ? "Yes" : "No");
fprintf(stderr, " Resolution: %dx%d\n", enc->width, enc->height);
}
return (enc->total_frames > 0 && enc->fps > 0);
return (config->total_frames > 0 && config->fps > 0);
}
// Start FFmpeg process for video conversion with frame rate support
@@ -1857,6 +1840,7 @@ int main(int argc, char *argv[]) {
}
// Load subtitle file if specified
printf("Loading subtitles...\n");
if (enc->subtitle_file) {
enc->subtitle_list = parse_srt_file(enc->subtitle_file, enc->fps);
if (enc->subtitle_list) {