使用ffmpeg连接两个mp4文件 [英] Concatenate two mp4 files using ffmpeg

问题描述

我正在使用ffmpeg连接两个mp4文件。我需要这是一个自动过程，因此我选择了ffmpeg。我将两个文件转换成.ts文件，然后连接它们，然后尝试对该并行的.ts文件进行编码。文件是h264和aac编码，我希望保持质量尽可能相同或接近原始。

I'm trying to concatenate two mp4 files using ffmpeg. I need this to be an automatic process hence why I chose ffmpeg. I'm converting the two files into .ts files and then concatenating them and then trying to encode that concated .ts file. The files are h264 and aac encoded and I'm hoping to keep the quality the same or as close to original as possible.

ffmpeg -i part1.mp4 -vcodec copy -vbsf h264_mp4toannexb -acodec copy part1.ts
ffmpeg -i part2.mp4 -vcodec copy -vbsf h264_mp4toannexb -acodec copy part2.ts
cat part1.ts part2.ts > parts.ts
ffmpeg -y -i parts.ts -acodec copy -ar 44100 -ab 96k -coder ac -vbsf h264_mp4toannexb parts.mp4

不幸的是，我在编码期间从ffmpeg收到以下错误消息：

Unfortunately I'm getting the following error message coming back from ffmpeg during encoding:

[h264 @ 0x1012600]sps_id out of range
[h264 @ 0x1012600]non-existing SPS 0 referenced in buffering period
[h264 @ 0x1012600]sps_id out of range
[h264 @ 0x1012600]non-existing SPS 0 referenced in buffering period
[NULL @ 0x101d600]error, non monotone timestamps 13779431 >= 13779431kbits/s    
av_interleaved_write_frame(): Error while opening file

这种情况发生在编码的一半，这使我觉得你不能将两个.ts文件并入并使其工作。 / p>

This happens about half way through encoding which makes me think that you can't concat two .ts files together and have it work.

推荐答案

我最终使用mpg作为中间格式，它工作（注意这是一个危险的例子，编码视频...）

I ended up using mpg as the intermediate format and it worked (NOTE this is a dangerous example, -qscale 0 will re-encode the video...)

ffmpeg -i 1.mp4 -qscale 0 1.mpg
ffmpeg -i 2.mp4 -qscale 0 2.mpg
cat 1.mpg 2.mpg | ffmpeg -f mpeg -i - -qscale 0 -vcodec mpeg4 output.mp4

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