ffmpeg - 无法在 ffmpeg 视频转换中保留元数据

Question

我想在使用 ffmpeg/avconv 转换视频时保留创建时间元数据。这是我要转换的文件:

$ ffmpeg -i in.avi 
ffmpeg version 0.8.6-4:0.8.6-0ubuntu0.12.04.1, Copyright (c) 2000-2013 the Libav developers
  built on Apr  2 2013 17:00:59 with gcc 4.6.3
Input #0, avi, from 'in.avi':
  Metadata:
    creation_time   : 2013-08-12 06:59:14
    encoder         : CanonMVI06
  Duration: 00:00:12.26, start: 0.000000, bitrate: 14549 kb/s
    Stream #0.0: Video: mjpeg, yuvj422p, 640x480, 30 tbr, 30 tbn, 30 tbc
    Stream #0.1: Audio: pcm_u8, 11024 Hz, 1 channels, u8, 88 kb/s

在 first我运行的方法

$ ffmpeg -i in.avi -vcodec libx264 -acodec libmp3lame -r 30 -map_metadata 0 out.avi

并获取一个不包含我想保留的“creation_date”元数据的输出文件:

$ ffmpeg -i out.avi 
ffmpeg version 0.8.6-4:0.8.6-0ubuntu0.12.04.1, Copyright (c) 2000-2013 the Libav developers
  built on Apr  2 2013 17:00:59 with gcc 4.6.3
[avi @ 0x83ba260] max_analyze_duration reached
Input #0, avi, from 'out.avi':
  Metadata:
    encoder         : Lavf53.21.1
  Duration: 00:00:12.38, start: 0.000000, bitrate: 704 kb/s
    Stream #0.0: Video: h264 (Main), yuv420p, 640x480, 30 fps, 30 tbr, 30 tbn, 60 tbc
    Stream #0.1: Audio: mp3, 11025 Hz, mono, s16, 200 kb/s

我也尝试过another方法

$ ffmpeg -i in.avi -f ffmetadata metadata.txt
$ ffmpeg -i in.avi -f ffmetadata -i metadata.txt -vcodec libx264 -acodec libmp3lame -r 30 out.avi

即使metadata.txt具有正确的信息，也能获得相同的成功:

;FFMETADATA1
creation_time=2013-08-12 06:59:14
encoder=CanonMVI06

我做错了什么？

Answer 1

要保留通用创建日期(触摸)和元数据创建日期:

#! /bin/bash
shopt -s globstar || exit
for f in **
do
if [[ "$f" =~ \.AVI$ ]] || [[ "$f" =~ \.avi$ ]] ; then
    t="${f%.*}"_compressed.mp4
    tM="${f%.*}"_compressedM.mp4
    txt="${f%.*}".txt
    ffmpeg -i "$f" -c copy -map_metadata 0 -map_metadata:s:v 0:s:v -map_metadata:s:a 0:s:a -f ffmetadata "$txt"
    if yes |      ffmpeg -i "$f" -c:v libx264 -crf 20 -c:a aac -strict -2 "$t"; then
        ffmpeg -i "$t" -f ffmetadata -i "$txt" -c copy -map_metadata 1 "$tM" 
        touch -r "$f" "$tM"
        rm -f "$t"
    else
    rm -f "$t"
    echo "Command failed"
    fi
fi
done