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我有我制作的 ip-cam mjpeg，它总共有 240 帧

编码源是 ffmpeg.exe -framerate 25 -ic:\%06d.jpg\ -s 1920x1080 -qscale 1 -vcodec mjpeg -r 25 C:\result.mjpg -y

现在我想通过我制作的 mjpeg 播放器播放 result.mjpg

my problem
1. i can't get mjpeg's play time or duration time

2. playing is slower then other movie player so i want to sync it and play more faster

下面是ffprobe结果

Input #0, mjpeg, from 'result.mjpg':
Duration: N/A, bitrate: N/A
Stream #0:0: Video: mjpeg, yuvj444p(pc, bt470bg), 1920x1080, 25 tbr, 1200k tbn, 25 tbc

以下是添加的结果 -show_frame

[FRAME]
media_type=video
key_frame=1
pkt_pts=720000
pkt_pts_time=0.600000
pkt_dts=720000
pkt_dts_time=0.600000
best_effort_timestamp=720000
best_effort_timestamp_time=0.600000
pkt_duration=48000
pkt_duration_time=0.040000
pkt_pos=4731406
pkt_size=313289
width=1920
height=1080
pix_fmt=yuvj444p
sample_aspect_ratio=333:320
pict_type=I
coded_picture_number=0
display_picture_number=0
interlaced_frame=0
top_field_first=0
repeat_pict=0
[/FRAME]

ffprobe 告诉我有持续时间：N/A，比特率：N/A

我如何设置持续时间和比特率我必须设置任何编码选项吗？

当我像下面这样解码 mjpeg

我不能只得到 0 的持续时间

AVFormatContext*  pFC;
int               ret;

pFC = avformat_alloc_context();

ret  = avformat_open_input(&pFC, filename, NULL, NULL);
if (ret < 0) {
    // fail .
}

ret  = avformat_find_stream_info(pFC, NULL);
if (ret < 0) {
    // fail
}
printf("duration %ld", pFC->duration);   <----- only 0
4

1 回答 1

0

我将选项从 SWS_BICUBIC 更改为 SWS_FAST_BILINEAR 似乎更快，我的问题 2 已完成

static int sws_flags = SWS_BICUBIC;
struct SwsContext *img_convert_ctx;
img_convert_ctx = sws_getContext(   pVCtx->width, 
                                    pVCtx->height,
                                    pVCtx->pix_fmt,
                                    pVCtx->width, 
                                    pVCtx->height,
                                    PixelFormat::PIX_FMT_BGR24,
                                    sws_flags, NULL, NULL, NULL)


static int sws_flags = SWS_FAST_BILINEAR;
struct SwsContext *img_convert_ctx;
img_convert_ctx = sws_getContext(   pVCtx->width, 
                                    pVCtx->height,
                                    pVCtx->pix_fmt,
                                    pVCtx->width, 
                                    pVCtx->height,
                                    PixelFormat::PIX_FMT_BGR24,
                                    sws_flags, NULL, NULL, NULL);
于 2014-10-10T08:17:38.793 回答