设置使用ffmpeg的视频流的元数据 [英] Setting video stream metadata using Ffmpeg

问题描述

我使用的JavaCV <一href="https://github.com/bytedeco/javacv/blob/master/src/main/java/org/bytedeco/javacv/FFmpegFrameRecorder.java">FFmpegFrameRecorder等级，符合EN code Android的摄像头preVIEW帧到视频。

I'm using the JavaCV FFmpegFrameRecorder class to encode Android's camera preview frames into a video.

我们的目标是复制下面的命令行的结果是：

The goal would be to replicate the result of the following command line:

ffmpeg -i input.mp4 -metadata:s:v:0 rotate="90" output.mp4

我修改了 startUnsafe（）的方法如下，但它不能产生所需要的输出：

I modified the startUnsafe() method as follows, but it failed to generate the desired output:

if ((video_st = avformat_new_stream(oc, video_codec)) != null) {
        video_c = video_st.codec();
        video_c.codec_id(oformat.video_codec());
        video_c.codec_type(AVMEDIA_TYPE_VIDEO);
        ...
        AVDictionary avDictionary = new AVDictionary(null);
        av_dict_set(avDictionary, "rotate", "90", 0);
        video_st.metadata(avDictionaty);
        ...
}
...
avformat_write_header(oc, (PointerPointer) null);

这还是连接codeS视频正确，但加元从来没有出现在ffprobe。如果有帮助，视频编码为H264。

This still encodes the video correctly, but the added metadata never appears on ffprobe. If it helps, the video encoding is h264.

顺便说一句，这里的ffprobe输出：

By the way, here's the ffprobe output:

ffprobe version 2.3.3 Copyright (c) 2007-2014 the FFmpeg developers
  built on Jan 22 2015 18:22:57 with Apple LLVM version 6.0 (clang-600.0.56) (based on LLVM 3.5svn)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/2.3.3 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-nonfree --enable-hardcoded-tables --enable-avresample --enable-vda --cc=clang --host-cflags= --host-ldflags= --enable-libx264 --enable-libfaac --enable-libmp3lame --enable-libxvid --enable-libfreetype --enable-libvorbis --enable-libvpx --enable-libass --enable-ffplay --enable-libfdk-aac --enable-libopus --enable-libquvi --enable-libx265
  libavutil      52. 92.100 / 52. 92.100
  libavcodec     55. 69.100 / 55. 69.100
  libavformat    55. 48.100 / 55. 48.100
  libavdevice    55. 13.102 / 55. 13.102
  libavfilter     4. 11.100 /  4. 11.100
  libavresample   1.  3.  0 /  1.  3.  0
  libswscale      2.  6.100 /  2.  6.100
  libswresample   0. 19.100 /  0. 19.100
  libpostproc    52.  3.100 / 52.  3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'abcd.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf56.15.102
  Duration: 00:00:19.48, start: 0.023220, bitrate: 572 kb/s
    Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 1280x720, 573 kb/s, 5.71 fps, 30 tbr, 15360 tbn, 60 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 64 kb/s (default)
    Metadata:
      handler_name    : SoundHandler

这是为什么它没有什么建议？谢谢你。

Any suggestions on why is it failing? Thanks.

推荐答案

看来这个问题产生了很大的兴趣，所以我加入了一些更多的信息。在此之后 GitHub的问题塞缪尔从JavaCV的提交一些修改，以允许对元数据的设置更容易获得。

It seems this question generated a lot of interest so I'm adding some more info. Following this GitHub issue Samuel from JavaCV committed some changes to allow easier access to metadata settings.

设置的元数据可以通过以下code段来实现：

Setting metadata can be achieved through the following code snippet:

AVDictionary metadata = new AVDictionary(null);
for (Entry<String, String> e : videoMetadata.entrySet()) {
    av_dict_set(metadata, e.getKey(), e.getValue(), 0);
}
video_st.metadata(metadata);

您可以通过执行实现它现在 MVN安装-Pffmpeg 或等待下一个JavacV版本，这应该是0.12。

You can enable it right now by doing mvn install -Pffmpeg or wait until the next JavacV release, which should be 0.12.

PS：正如你所看到的，这是类似于我presented在我的问题pretty的，所以我不知道为什么它摆在首位没有工作

PS: As you can see, this is pretty similar to what I presented in my question, so I'm not sure why it didn't work in the first place.

这篇关于设置使用ffmpeg的视频流的元数据的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！