FFmpeg创建输出目录层次结构

Question

最近买了一个输出RTSP流的ip-cam.我正在使用FFmpeg的分段选项来创建60分钟长的录音.

我希望FFmpeg将文件写入基于的目录Year/Month/Date,并写入文件Hour-Minute.mp4例如: /raid1/homes/share/public/recordings/queue/bedroom/2017/04/23/13-05.mp4对于在2017年4月23日13:05开始的录制.

不幸的是,FFmpeg似乎没有创建目录层次结构.FFmpeg退出,因为无法找到目录.

Input #0, rtsp, from 'rtsp://192.168.1.240/unicast':
  Metadata:
    title           : LIVE555 Streaming Media v2014.07.04
    comment         : LIVE555 Streaming Media v2014.07.04
  Duration: N/A, start: 0.000750, bitrate: N/A
    Stream #0:0: Video: h264 (High), yuv420p, 1920x1080, 90k tbr, 90k tbn, 180k tbc
    Stream #0:1: Audio: pcm_alaw, 8000 Hz, 1 channels, s16, 64 kb/s
[segment @ 0x2557300] Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead.
[segment @ 0x2557300] Failed to open segment '/raid1/homes/share/public/recordings/queue/bedroom/2017/04/23/14-19.mp4'
Output #0, segment, to '/raid1/homes/share/public/recordings/queue/bedroom/%Y/%m/%d/%H-%M.mp4':
  Metadata:
    title           : LIVE555 Streaming Media v2014.07.04
    comment         : LIVE555 Streaming Media v2014.07.04
    encoder         : Lavf57.41.100
    Stream #0:0: Video: h264, yuv420p, 1920x1080, q=2-31, 90k tbr, 90k tbn, 90k tbc
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
Could not write header for output file #0 (incorrect codec parameters ?): No such file or directory

record.sh如下:

#!/bin/sh
ffmpeg -stimeout 600\
 -rtsp_transport udp \
 -i rtsp://192.168.1.240/unicast \
 -c copy \
 -map 0:0 \
 -f segment \
 -segment_time 3600 \
 -segment_wrap 100 \
 -segment_format mov \
 -strftime 1 \
 -reset_timestamps 1 \
 "/raid1/homes/share/public/recordings/queue/bedroom/%Y/%m/%d/%H-%M.mp4"

我试过不使用目录层次结构:"/raid1/homes/share/public/recordings/queue/bedroom/%Y-%m-%d_%H-%M.mp4".这很好用.

$ ffmpeg -version
ffmpeg version N-80901-gfebc862 Copyright (c) 2000-2016 the FFmpeg developers
built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.3)
configuration: --extra-libs=-ldl --prefix=/opt/ffmpeg --mandir=/usr/share/man --enable-avresample --disable-debug --enable-nonfree --enable-gpl --enable-version3 --enable-libopencore-amrnb --enable-libopencore-amrwb --disable-decoder=amrnb --disable-decoder=amrwb --enable-libpulse --enable-libfreetype --enable-gnutls --enable-libx264 --enable-libx265 --enable-libfdk-aac --enable-libvorbis --enable-libmp3lame --enable-libopus --enable-libvpx --enable-libspeex --enable-libass --enable-avisynth --enable-libsoxr --enable-libxvid --enable-libvidstab
libavutil      55. 28.100 / 55. 28.100
libavcodec     57. 48.101 / 57. 48.101
libavformat    57. 41.100 / 57. 41.100
libavdevice    57.  0.102 / 57.  0.102
libavfilter     6. 47.100 /  6. 47.100
libavresample   3.  0.  0 /  3.  0.  0
libswscale      4.  1.100 /  4.  1.100
libswresample   2.  1.100 /  2.  1.100
libpostproc    54.  0.100 / 54.  0.100

FFmpeg可以随时创建输出目录吗？

Answer 1

不，FFmpeg 不能那样做

不过，我们可以在record.sh脚本顶部添加几行来为您创建目录。

#!/bin/sh

BASEDIRECTORY = /raid1/homes/share/public/recordings/queue/bedroom

YEAR=$(date +"%Y");
MONTH=$(date +"%m");
DAY=$(date +"%d");

# Create a directory tree for the day 
# using the current year, month, and day
mkdir -p $BASEDIRECTORY/$YEAR/$MONTH/$DAY

# Start FFmpeg hourly recordings
ffmpeg -stimeout 600\
 -rtsp_transport udp \
 -i rtsp://192.168.1.240/unicast \
 -c copy \
 -map 0:0 \
 -f segment \
 -segment_time 3600 \
 -segment_wrap 100 \
 -segment_format mov \
 -strftime 1 \
 -reset_timestamps 1 \
 "$BASEDIRECTORY/$YEAR/$MONTH/$DAY/%H-%M.mp4"

现在我们只需要record.sh一夜之间重新启动即可为$DAY. 这听起来对 cron 来说是一个完美的工作：如何编写一个每天午夜运行脚本的 cron？

注意：这个脚本现在需要root权限，所以如果你收到下面的错误并且cron不起作用，请确保你在sudo ./record.sh测试时输入并以 root 用户身份安装你的 crontab 像这样：sudo crotab -u root -e，正如@dashesy在他的评论。

这是因为mkdir使用-por--parent选项需要root权限，如果目录不存在，FFmpeg 将抛出此错误：

Failed to open segment '/raid1/homes/share/public/recordings/queue/bedroom/2019/01/31/10-37.mp4'
Could not write header for output file #0 (incorrect codec parameters ?): No such file or directory