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• FFMPEG - moov atom not found after elaboration

  8 juillet 2019, par Pier Giorgio Misley

  I have a command where I put overlay images over a video.
  After that I resize the output to fit certain dimensions.

  Everything usually works fine, but sometimes and only from a certain desktop computer, when the second elaboration starts, the command returns an error : moov atom not found

  Lets put some code :

  My first command is pretty long, I past just the important stuff with a 2 pictures example :

  -i inputVideo.mp4 -i 1.jpg -i 2.jpg
  
  -filter_complex "[1:v]format=yuva422p,[Other effects...][im1];
  
  [2:v]format=yuva422p,[Other effects...][im2];
  
  [0][im1]overlay=(main_w-overlay_w)/2:(main_h - overlay_h)/2[o1];
  
  [o1][im2]overlay=(main_w-overlay_w)/2:(main_h - overlay_h)/2"
  
  -crf 18 -c:a copy output.mp4

  My second command is the following :

  -i output.mp4 -crf 19 resized.mp4

  I think I am missing something in my first command, but what ?
  If I execute the same exact code from my portable computer, it works fine.

  Thanks for the help !

  Here is the link for both log ffmpeg logs

  Last edit (I hope) :)

  I added in that github repository the ffmpeg command I tried and the source files to reproduce the problem. I hope anyone will ever find a solution

  In the repository there are :

  • LAST_CommandLine_Command -> it’s the ffmpeg command I am running
  • LAST_CommandLine_Command_Output -> it is one of my ffmpeg’s run output (it’s the last I’ve tried)
  • Files from 01.jpg to 10.jpg -> those are the pictures I’m overlaying over the video with the command
  • My input video for the ffmpeg command.

  I tried running this command with :
   A Windows console application that run it for me
   Directly from command line
   With a command line dotnet myapplication.dll (running my application not from debug but from publish)

  Results :

  It worked 1 times out of 10 for those specific files, in other cases it randomly stopped after some seconds (fron 45’’ to 1’55’’, depending on run).

  Note : I tried with -threads 1, -threads 2 and without any thread limitation. It failed in all cases

• FFMPeg H264 decoder and GOP Frames

  19 juillet 2017, par Andrea Bonvento

  I used ffmeg library in linux to decode H264 from remote RTSP server, using live555, its all ok, decoding process produce correct AVFrame structures filled with so called H264 GOP.
  Every produced AVFrame may contain a I-Frame or P-Frame or B-Frame
  But I need to obtain uncompressed sequence of pictures (bitmaps maybe ?) and take only relative I-Frames from any GOP is not a solution... some RTSP servers send big GOP.
  I have to show videos to RGB leds billboards with proprietary protocol.
  A have no idea how to do that with ffmpeg (libavcodec)

  thanks

• GOP structure via FFmpeg

  25 septembre 2015, par Serhan

  I have two questions regarding the Group-of-Pictures (GOP) in MPEG4 Video (both for MPEG4 Part2 and H.264) :

  1. How can I extract the GOP structure and size of a video sequence using FFmpeg ? I know that the av_get_picture_type_char function of the AVPicture struct yields picture types for each frame, but I wonder if there is a more direct method to obtain the GOP information ?

  2. How can I detect whether the sequence has open GOPs or closed GOPs, i.e. whether B frames from one GOP are allowed to refer to the I and P frames in an adjacent GOP ?