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• FFmpeg : how to produce MP4 CENC (Common Encryption) videos

  2 novembre 2022, par Roland Le Franc

  What is the correct syntax to do CENC encryption with ffmpeg ?

  



  The ffmpeg 3.0 release notes include "Common Encryption (CENC) MP4 encoding and decoding support", and the files libavformat/movenccenc.h and libavformat/movenccenc.c seem to include everything needed to encrypt MP4 files according to the Common Encryption standard.

  



  However, I can't find any documentation on this topic in the ffmpeg manual pages.

  



  Regards

  


• ffmpeg opperation not permtted on rtmp

  24 janvier 2021, par Nibir Ray

  I am trying to make a internet radio using ffmpeg. I have a folder full of mp3 and have a 5sec mp4 that i want to use in a infinite loop. so here is the code i came up with to stream on YouTube

  


  #! /bin/bash

    VBR="1500k"
    FPS="30"
    QUAL="ultrafast"
    YOUTUBE_URL=" rtmp://a.rtmp.youtube.com/live2"
    YOUTUBE_KEY="YOUTUBE_KEY_HERE"
    VIDEO_SOURCE="output.mp4"
    AUDIO_ENCODER="aac"
    
    ffmpeg \
     -stream_loop -1 \
     -re \
     -i "$VIDEO_SOURCE" \
     -thread_queue_size 512 \
     -stream_loop -1 \
     -re \
     -f concat -safe 0 -i audio.txt \
     -c:v libx264 -preset $QUAL -r $FPS -g $(($FPS *2)) -b:v $VBR -bufsize 3000k -maxrate $VBR \
     -c:a $AUDIO_ENCODER -ar 44100 -b:a 128k -pix_fmt yuv420p \
     -f flv -flvflags no_duration_filesize $YOUTUBE_URL/$YOUTUBE_KEY


  


  The problem is the i am getting an error saying operation not permitted

  


  here is the error log

  


  Error while filtering: Operation not permittede=00:00:03.73 bitrate=1369.7kbits/s speed=0.854x
frame=   46 fps=9.4 q=16.0 Lsize=     742kB time=00:00:04.50 bitrate=1350.0kbits/s speed=0.921x
video:668kB audio:70kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.622114%
[libx264 @ 0x5584c6bcf620] frame I:1     Avg QP:37.00  size: 50802
[libx264 @ 0x5584c6bcf620] frame P:45    Avg QP:23.92  size: 14046
[libx264 @ 0x5584c6bcf620] mb I  I16..4: 100.0%  0.0%  0.0%
[libx264 @ 0x5584c6bcf620] mb P  I16..4:  4.3%  0.0%  0.0%  P16..4: 17.9%  0.0%  0.0%  0.0%  0.0%    skip:77.8%
[libx264 @ 0x5584c6bcf620] coded y,uvDC,uvAC intra: 30.5% 41.6% 16.6% inter: 7.3% 10.1% 1.9%
[libx264 @ 0x5584c6bcf620] i16 v,h,dc,p: 44% 43%  8%  5%
[libx264 @ 0x5584c6bcf620] i8c dc,h,v,p: 32% 40% 24%  5%
[libx264 @ 0x5584c6bcf620] kb/s:1187.63
[aac @ 0x5584c6bd2f20] Qavg: 320.800


  


  I think this error is due to the video that I am looping is too short and the -stream_loop -1 flag seems buggy according to some guys on superuser and stackoverflow.

  


  Is there any other way to fix this

  


• FFMPEG merging videos Non-monotonous DTS in output stream 0:1 [closed]

  29 avril 2023, par Eric Velez

  When i use this command it in generally works with no issues but I get this warning and the video is super long (should be 20 or 30 seconds and is 24 minutes)

  


  ffmpeg -f concat -safe 0 -i manual.txt -c copy C:\Users\Eric\Downloads\manual_merge\asdf.mp4


  


  this is the output from the command promp

  


  [mp4 @ 000001b34d593fc0] Non-monotonous DTS in output stream 0:1; previous: 608569, current: 12201; changing to 608570. This may result in incorrect timestamps in the output file.


  


  how do i fix this warning ?