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• Issues with file created using FFMPEG

  31 mars 2020, par amateur

  I am a newbie to ffmpeg but currently using it Powershell to cut video clips from an mp4 file. What I am looking to do is cut a segment from a video and create a new mp4 file with such. I run the following command, see following example for one clip created. Run this multiple times with different start times and duration's through out the source file :

  



  -ss 00:02:42.9060000 -i "C:\Users\User\Desktop\MySourceVideo.mp4" -t 00:00:07.2800000 -c:v copy "C:\Users\User\Desktop\MyClip.mp4" -y -v quiet


  



  Source file is mp4, with H264 video codec, AAC video codec.

  



  While it creates the clips, I run it at different times in the source video creating multiple cut mp4 videos. When I look to play the newly created mp4 files, for some clips I find some inconsistencies, such as :

  



  

  • Playing the file for first few seconds just has black scream

  


  • Playing the file for first few seconds has video moving very fast and then normal again

  


  



  Some clips are perfect, others have the above issues. I would appreciate if my command could be checked in case I am missing a parameter or any further insight could be given ?

  


• Combine mp4 init file and m4s segments to a single mp4 file

  5 août 2020, par David Oz

  In my Nodejs server, I'm trying to combine init-file in mp4 format, with some m4s segments.
I've used Buffer.concat() and it partially worked, it seems like the segments hold an offset because they are taken from the middle of a video that is played with mpeg-dash, which causes an incorrect start time. when I use the fluent-ffmpeg npm library, the file is fixed, but it takes way too long (about as long as the video itself).
I was wondering if is it possible to fix the problem by changing some bytes in the buffer or anything faster like that.

  


• ffmpeg batch process issue mac

  22 octobre 2023, par e e

  I'm using ffmpeg to batch process all files(with names containing spaces) in a directory. The script is like :

  


  echo my converter
read -p "Enter give folder: " folder
echo '//////////////////////START CONVERTING FROM FOLDER///////////////////////'

find $folder -type f -name "*[[:space:]]*" | while read file; do
    release="${file%%.*}"'_t.mp4';
    echo "$file";
    ffmpeg -i "$file" -c copy "$release" -loglevel error -stats
    echo $release;
done


  


  the script searches all the files in the address and ffmpeg one by one. However the first file will always fail due to some unknown issues :

  


  [mpegts @ 0x7fb8e9904a40] Continuity check failed for pid 17 expected 2 got 3
[mpegts @ 0x7fb8e9904a40] Continuity check failed for pid 0 expected 0 got 2
[mpegts @ 0x7fb8e9904a40] Continuity check failed for pid 4096 expected 0 got 2
[mpegts @ 0x7fb8e9904a40] Continuity check failed for pid 256 expected 2 got 7
[mpegts @ 0x7fb8e9904a40] Packet corrupt (stream = 0, dts = 203523000).
/Users/xy/Downloads/aaa/aa vv.ts: corrupt input packet in stream 0
[NULL @ 0x7fb8e9905a40] Decoding VUI



  


  If there is only one file, the process works fine.
If comment out the ffmpeg command, it echoes as expected :

  


  /Users/xy/Downloads/aaa/aa vv_t.mp4
/Users/xy/Downloads/aaa/aa vv_t_t.mp4
/Users/xy/Downloads/aaa/aa vv.ts
/Users/xy/Downloads/aaa/aa vv_t.mp4
/Users/xy/Downloads/aaa/cc ee.ts
/Users/xy/Downloads/aaa/cc ee_t.mp4


  


  it first find the target files and then converts into another with different file names.
Any suggestions, thank you !!