After ffmpeg encode, AVPacket pts and dts is AV_NOPTS_VALUE - ffmpeg

Question

I would like to ask a question about ffmpeg when i use encoder (x264).
this is my code :
int
FFVideoEncoder::init(AVCodecID codecId, int bitrate, int fps, int gopSize,
int width, int height, AVPixelFormat format) {
release();
const AVCodec *codec = avcodec_find_encoder(codecId);
m_pCodecCtx = avcodec_alloc_context3(codec);
m_pCodecCtx->width = width;
m_pCodecCtx->height = height;
m_pCodecCtx->pix_fmt = format;
m_pCodecCtx->bit_rate = bitrate;
m_pCodecCtx->thread_count = 5;
m_pCodecCtx->max_b_frames = 0;
m_pCodecCtx->gop_size = gopSize;
m_pCodecCtx->time_base.num = 1;
m_pCodecCtx->time_base.den = fps;
//H.264
if (m_pCodecCtx->codec_id == AV_CODEC_ID_H264) {
// av_dict_set(&opts, "preset", "slow", 0);
av_dict_set(&m_pEncoderOpts, "preset", "superfast", 0);
av_dict_set(&m_pEncoderOpts, "tune", "zerolatency", 0);
m_pCodecCtx->flags |= CODEC_FLAG_GLOBAL_HEADER;
m_pCodecCtx->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
}
int ret = avcodec_open2(m_pCodecCtx, m_pCodecCtx->codec, &m_pEncoderOpts);
if (ret == 0) {
LOGI("open avcodec success!");
} else {
LOGE("open avcodec error!");
return -1;
}
return ret;
}
int FFVideoEncoder::encode(const Frame &inFrame, AVPacket *outPacket) {
AVFrame *frame = av_frame_alloc();
// avpicture_fill((AVPicture *) frame, inFrame.getData(), AV_PIX_FMT_YUV420P, inFrame.getWidth(),
// inFrame.getHeight());
av_image_fill_arrays(frame->data, frame->linesize, inFrame.getData(), m_pCodecCtx->pix_fmt,
inFrame.getWidth(), inFrame.getHeight(), 1);
int ret = 0;
ret = avcodec_send_frame(m_pCodecCtx, frame);
if (ret != 0) {
LOGE("send frame error! %s", av_err2str(ret));
} else {
ret = avcodec_receive_packet(m_pCodecCtx, outPacket);
LOGI("extract data size = %d", m_pCodecCtx->extradata_size);
if (ret != 0) {
LOGE("receive packet error! %s", av_err2str(ret));
}
};
av_frame_free(&frame);
return ret;
}
I expect that the AVPacket will carry the pts and dts about this frame.
but in fact, i only can get encoded frame data and size.
//====================================
except this question, i have another quesiont:
x264 docs say that "tune" opts can be set like film、animation and others. but i only can get a normal video when i set "zerolatency" params. When i set others opts, video's bitrate is very low.
Thanks your answer.

Answer 1

This is for simple example to see if it works:
I believe you should set frame->pts beforehand.
Try this:
Set frame->pts = framecount before sending to ret = avcodec_send_frame(m_pCodecCtx, frame)
Add this framecount as a simple counter of frames you send for encode. Increases each time.
Hope that helps.