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视频拼接结果输出及第二部分 Fast farword

tag-icon • tag-icon ffmpeg trim concatenation
视频拼接结果输出及第二部分 Fast farword

我在连接视频时遇到了问题。

首先使用以下命令修剪不同视频中的块

val cmd = arrayOf("-ss", start, "-i", inputFile.ts,"-c:v" ,"libx264","-preset" ,"ultrafast","-crf" ,"32", "-tune","fastdecode","-t",
        duration, "-avoid_negative_ts", "make_zero","-fflags","+genpts",
        outPutPath.mp4
    )

使用以下命令进行第二次合并

 val cmd = arrayOf("-f", "concat", "-safe", "0", "-i", data.ts, "-c", "copy", outP.mp4)

仅当视频尺寸不同时才会发生这种情况。 请指导我这里做错了什么或如何解决这个问题。

更新 我知道您必须将视频缩放到相同的大小才能实现上述效果。我已执行以下命令：** 过滤器 setsar 具有未连接的输出转换失败！**

 var cmd = arrayOf( "-i", listofFiles[0],"-i",listofFiles[1], "-filter_complex",
        "[0]scale=640:480:force_original_aspect_ratio=decrease,pad=640:480:(ow-iw)/2:(oh-ih)/2,setsar=1[0v];[1]scale=640:480:force_original_aspect_ratio=decrease,pad=640:480:(ow-iw)/2:(oh-ih)/2,setsar=1[1v];[0:v][0:a][1:v][1:a]concat=n=2:v=1:a=1:unsafe=1[v][a]", "-map", "[v]","-map" ,"[a]" ,outP)"

出错：

    Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/storage/emulated/0/Flory/temp/Trimmed1599124061259.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.35.101
  Duration: 00:00:05.02, start: 0.000000, bitrate: 1537 kb/s
    Stream #0:0(eng): Video: h264 (avc1 / 0x31637661), yuv420p, 1080x1920 [SAR 1:1 DAR 9:16], 1465 kb/s, 24.97 fps, 24.87 tbr, 90k tbn, 49.74 tbc (default)
    Metadata:
      handler_name    : VideoHandle
    Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 70 kb/s (default)
    Metadata:
      handler_name    : SoundHandle
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from '/storage/emulated/0/Flory/temp/Trimmed1599124064134.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.35.101
  Duration: 00:00:03.02, start: 0.000000, bitrate: 16173 kb/s
    Stream #1:0(eng): Video: h264 (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 16279 kb/s, 29.79 fps, 29.58 tbr, 11360 tbn, 59.17 tbc (default)
    Metadata:
      handler_name    : VideoHandle
    Stream #1:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 69 kb/s (default)
    Metadata:
      handler_name    : SoundHandle
Filter setsar has an unconnected output
Conversion failed!

请帮助我，我已经被困了一个星期了。

答案1

使用[0v]和[1v]作为 concat 过滤器的输入，而不是[0:v]和[1:v]。

ffmpeg -i input0.mp4 -i input1.mp4 -filter_complex "[0]scale=640:480:force_original_aspect_ratio=decrease,pad=640:480:(ow-iw)/2:(oh-ih)/2,setsar=1[0v];[1]scale=640:480:force_original_aspect_ratio=decrease,pad=640:480:(ow-iw)/2:(oh-ih)/2,setsar=1[1v];[0v][0:a][1v][1:a]concat=n=2:v=1:a=1[v][a]" -map "[v]" -map "[a]" output.mp4

答案2

解决了

通过运行以下命令：

        var cmd = arrayOf( "-i", listofFiles[0],"-i",listofFiles[1],"-max_muxing_queue_size", "9999","-vsync" ,"2" , "-filter_complex",
        "[0]scale=640:480:force_original_aspect_ratio=decrease,pad=640:480:(ow-iw)/2:(oh-ih)/2,setsar=1[0v];[1]scale=640:480:force_original_aspect_ratio=decrease,pad=640:480:(ow-iw)/2:(oh-ih)/2,setsar=1[1v];[0v][0:a][1v][1:a]concat=n=2:v=1:a=1:unsafe=1[outv][outa]", "-map", "[outv]","-map" ,"[outa]","-c:a", "aac","-strict", "-2","-c:v","libx264","-crf" ,"32",outP)

这会使音频流保留在最终输出中，同时将两个输入缩放为相等的最小尺寸以避免拉伸。

不确定这是否是最好的解决方案，但至少它是一个可行的解决方案。

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