[FFmpeg-user] CUTTING A VIDEO WITHOUT RE-ENCODING GETS AUDIO OUT OF SYNC

[Alejandro Escudero]

Here is the console output of the previous test ( ffmpeg -i file.mp4 -ss 00:03:00 -t 00:05:00 -c copy part1.mp4)

But i tried with this command (seconds before -i) and it worked (ffmpeg -ss 00:02:00 -i interview.mp4 -t 00:05:00 -c copy extract.mp4)

C:\Users\User\Desktop\ejemplosffmpeg>ffmpeg -i interview.mp4 -ss 00:02:00 -t 00:05:00 -c copy extract.mp4
ffmpeg version N-94423-ga0c1970781 Copyright (c) 2000-2019 the FFmpeg developers
  built with gcc 9.1.1 (GCC) 20190716
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt
  libavutil      56. 32.100 / 56. 32.100
  libavcodec     58. 55.100 / 58. 55.100
  libavformat    58. 30.100 / 58. 30.100
  libavdevice    58.  9.100 / 58.  9.100
  libavfilter     7. 58.100 /  7. 58.100
  libswscale      5.  6.100 /  5.  6.100
  libswresample   3.  6.100 /  3.  6.100
  libpostproc    55.  6.100 / 55.  6.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'interview.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: isommp42
    creation_time   : 2019-05-05T10:44:24.000000Z
  Duration: 00:20:56.34, start: 0.000000, bitrate: 341 kb/s
    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 1280x720 [SAR 1:1 DAR 16:9], 209 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
    Metadata:
      creation_time   : 2019-05-05T10:44:24.000000Z
      handler_name    : ISO Media file produced by Google Inc. Created on: 05/05/2019.
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 127 kb/s (default)
    Metadata:
      creation_time   : 2019-05-05T10:44:24.000000Z
      handler_name    : ISO Media file produced by Google Inc. Created on: 05/05/2019.
File 'extract.mp4' already exists. Overwrite ? [y/N] y
Output #0, mp4, to 'extract.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: isommp42
    encoder         : Lavf58.30.100
    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 1280x720 [SAR 1:1 DAR 16:9], q=2-31, 209 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 30k tbc (default)
    Metadata:
      creation_time   : 2019-05-05T10:44:24.000000Z
      handler_name    : ISO Media file produced by Google Inc. Created on: 05/05/2019.
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 127 kb/s (default)
    Metadata:
      creation_time   : 2019-05-05T10:44:24.000000Z
      handler_name    : ISO Media file produced by Google Inc. Created on: 05/05/2019.
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
frame= 8949 fps=0.0 q=-1.0 Lsize=   12460kB time=00:04:59.98 bitrate= 340.2kbits/s speed=3.71e+03x
video:7470kB audio:4688kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 2.482060%

C:\Users\User\Desktop\ejemplosffmpeg>



Thanks


Alejandro


________________________________
From: ffmpeg-user <ffmpeg-user-bounces at ffmpeg.org> on behalf of Carl Eugen Hoyos <ceffmpeg at gmail.com>
Sent: Thursday, August 29, 2019 11:16 PM
To: FFmpeg user questions <ffmpeg-user at ffmpeg.org>
Subject: Re: [FFmpeg-user] CUTTING A VIDEO WITHOUT RE-ENCODING GETS AUDIO OUT OF SYNC

Am Do., 29. Aug. 2019 um 23:41 Uhr schrieb Alejandro Escudero
<escuderoserrano at hotmail.com>:

> I am trying to cut a video file in to parts, without re-enconding the video, but i get a
> video file with non sync audio, how can I solve these with out re-encoding since I
> need a fast way to cut.
>
> I used this command:
>
>
> ffmpeg -i file.mp4 -ss 00:03:00 -t 00:05:00 -c copy part1.mp4

Complete, uncut console output missing.

Carl Eugen
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