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• A 'clean' way to cut an MP4 movie into two sections using FFMPEG ?

  30 août 2020, par Peter in Japan

  I am attempting to use FFMPEG to make a script that can easily split a short MP4 movie with sound into two pieces at a certain point. I've searched through what feels like hundreds of posts to try to find "the" answer, but most of my attempts end up with poor results, broken video files that cause my video play to freeze, and so on. I am attempting to make a script that allows me to easily cut a short anime movie (something grabbed from Twitter or some other short source) and cut it into two sections, so it can be under the 2:20 Twitter time limit, or to cut out some scene I don't want to show my followers.

  


  The issue is that FFMPEG is good at cutting videos into segments, but bad at know where keyframes are, so most videos have two seconds of blank video at the front before some keyframe appears, which looks terrible.

  


  One example I found that works well is below, which cuts any mp4 into a bunch of chunks of n second size (six seconds in the example below). Source and documentation for this is https://moe.vg/3b8eNTs

  


  ffmpeg -i seitokai.mp4 -c:v libx264 -crf 22 -map 0 -segment_time 6 -reset_timestamps 1 -g 30 -sc_threshold 0 -force_key_frames "expr:gte(t,n_forced*1)" -f segment output%03d.mp4

  


  This code works great, at least allowing me to access the "left" side of a video that I want, in this case a six-second segment I want. Can anyone tell me how to accomplish the above, but starting at the 13-second period in said video, so I could get right "right" (not starting from 00:00:00) video cut cleanly ?

  


  Alternately, a single, unified and elegant way to split (re-encode) an MP4 into two segments that forces keyframes from the very beginning of the cut pieces would be wonderful. I can't believe how hard this seems to be.

  


  Thanks in advance for any help you can give ! Greetings from rural Japan !

  


• lavc : Add get_bitsz()

  11 janvier 2016, par Andreas Cadhalpun

  lavc : Add get_bitsz()
  get_bit variant supporting 0-bits reads.
  Signed-off-by : Luca Barbato <lu_zero@gentoo.org>
  

  • [DBH] libavcodec/get_bits.h
  • [DBH] libavcodec/mpegaudiodec_template.c

• statistics.getTime() returns always total time of input file in milli seconds during the process in android

  11 avril 2024, par Hamza

  In 6.0-2 android how can i get the percentage because statistics.getTime() returns always total time of input file in milli seconds during the process but it was working proper in previous version 4.4.LTS because in that version it was returning the time based on how much process has complete.

  


  Current behavior
It is returning total time of input file every time.

  


  Here is the link of my test application https://github.com/HamzaBula/Reverse-Video-Demo

  


  [Here is the screenshot for 4.4.LTS (frame and time both are perfect here)]
(https://i.stack.imgur.com/OEZED.png)

  


  Expected behavior
The time value should have to increase with ongoing video processing.

  


  Here is the screenshot for 6.0-2 (frame is perfect but time is not)