如何使用FFmpeg连接两个MP4文件? [英] How to concatenate two MP4 files using FFmpeg?

问题描述

我正在尝试使用ffmpeg连接两个mp4文件.我需要这是一个自动过程，因此为什么选择ffmpeg.我将这两个文件转换为.ts文件，然后将它们串联，然后尝试对该简明的.ts文件进行编码.这些文件是h264和aac编码的，我希望尽可能保持质量不变或接近原始文件.

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，在编码过程中，我从ffmpeg收到了以下错误消息:

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

这种情况大约发生在编码的一半，这使我认为您无法将两个.ts文件连接在一起并使它正常工作.

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，并且可以正常工作(注意，这是一个危险的示例，-qscale 0将重新编码视频...)

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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