ffmpeg - how to cut video from the end?

Question

fmpeg

Hello!
Please tell me how to cut (delete) the last 10 seconds of the video, leaving everything else.
The -ss command cuts the video first, I'm looking for the same command, but to remove it from the end.
-sseof doesn't work because it saves the video from the end and I need to delete it.

An example of a bat script to remove part of the video at the beginning.

@echo on

for %%i in (*.mp4) do (
  echo %%~pi
  ffmpeg -ss 00:00:6.57 -i "%%i" -y "out/%%~ni.mp4"
)

Please help me edit it so that it removes the last 10 seconds from the end.

Answer 1

Suggested solution on another resource:

ffmpeg -i %%j -itsoffset 6 -i %%j -c copy -map 0:a:0 -map 1 -shortest -f nut - | ffmpeg -y -i - -c copy -map 0 -map -0:0 -ss 6 -max_muxing_queue_size 9999 "out1/%%~ni.mp4"

Answer 2

HanRus, thanks, it works.
There is just a small problem. Ffmpeg displays errors when trimmed. Here are the log snippets:
Stream mapping:
Stream #0:1 -> #0:0 (copy)
Stream #1:0 -> #0:1 (copy)
Stream #1:1 -> #0:2 (copy)
Press [q] to stop, [?] for help
[nut @ 0000024076f8d0c0] Could not find codec parameters for stream 1 (Video: h264 (avc1 / 0x31637661), none, 492x360): unspecified pixel format
Consider increasing the value for the 'analyzeduration ' and 'probesize' options
...
Metadata:
creation_time : 2018-10-22T19:46:35.000000Z
handler_name : ISO Media file produced by Google Inc. Created on: 10/22/2018.
Stream #0:2(und): Audio: aac ([255][0][0][0] / 0x00FF), 44100 Hz, stereo, fltp (default)
Metadata:
creation_time : 2018-10-22T19:46: 35.000000Z
handler_name : ISO Media file produced by Google Inc. Created on: 10/22/2018.
[mp4 @ 0000024078c8c4c0] track 1: codec frame size is not set
...
Stream mapping:
Stream #0:1 -> #0:0 (copy)
Stream #0:2 -> #0:1 (copy)
[nut @000001854beac900] Multiple keyframes with same PTS2.56 bitrate= 409.5kbits/s speed= 796x
Is there any solution to fix it? I'm just starting to learn Ffmpeg, I have to try out a lot of things "at random".

Answer 3

Find the duration of the clip, subtract 10 seconds, substitute the resulting desired duration into -t ???:

ffmpeg -i SOURCE
// найти duration 

ffmpeg \
  -i SOURCE \
  -t XXX \
  -codec copy  \
  DESTINATION

In the absence of recoding, because codecs are the same, the process should be very fast.
For some formats, ffmpeg will show an approximate, not exact, duration.