stephenseo/EN605.617.81.FA21_StephenSeo_DitheringProject
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Impl better handling of input video fps

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This commit is contained in:
Stephen Seo 2021-12-06 17:02:09 +09:00
parent cac72a0cdf
commit ab6bd428c4
1 changed files with 34 additions and 2 deletions
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36
src/video.cc
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@ -120,8 +120,40 @@ bool Video::DitherVideo(const std::string &output_filename, Image *blue_noise,
avf_dec_context->streams[video_stream_idx]->codecpar->width;
unsigned int height =
avf_dec_context->streams[video_stream_idx]->codecpar->height;
auto r_frame_rate = avf_dec_context->streams[video_stream_idx]->r_frame_rate;
decltype(r_frame_rate) time_base = {r_frame_rate.den, r_frame_rate.num};
// try to get frame rate from duration, nb_frames, and input time_base
AVRational input_time_base =
avf_dec_context->streams[video_stream_idx]->time_base;
double duration = avf_dec_context->streams[video_stream_idx]->duration;
double frames = avf_dec_context->streams[video_stream_idx]->nb_frames;
AVRational time_base = {0, 0};
if (duration > 0 && frames > 0 && input_time_base.num > 0 &&
input_time_base.den > 0) {
double fps = (double)input_time_base.den / (double)input_time_base.num /
(duration / frames);
std::cout << "Got fps == " << fps << std::endl;
if (fps > 0) {
time_base.den = fps * 100000;
time_base.num = 100000;
}
}
if (time_base.num == 0 && time_base.den == 0) {
if (avf_dec_context->streams[video_stream_idx]->codecpar->codec_id ==
AV_CODEC_ID_H264) {
// get time_base from avg_frame_rate
AVRational *avg_frame_rate =
&avf_dec_context->streams[video_stream_idx]->avg_frame_rate;
time_base = {avg_frame_rate->den, avg_frame_rate->num};
} else {
// get time_base from r_frame_rate
AVRational *r_frame_rate =
&avf_dec_context->streams[video_stream_idx]->r_frame_rate;
time_base = {r_frame_rate->den, r_frame_rate->num};
}
}
std::cout << "Setting time_base of " << time_base.num << "/" << time_base.den
<< std::endl;
// Alloc a packet object for reading packets
AVPacket *pkt = av_packet_alloc();