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• Muxing two video streams without transcoding with ffpmeg and making vlc overlay them during play

  20 octobre 2016, par Laars Camot

  There is a software that claims it can be done but it’s two expensive for me for a try. Basically it muxes two video streams in one and makes the second transparent video stream overlay on top of the first like it would be a subtitle stream without video filters. The software author states that the resulting output should be playable with all players, including VLC. I’ve tried this :

  ffmpeg -i first.ts -i second.ts -vcodec copy -acodec copy -map 0 -map 1:0 -f mpegts out.ts

  But it simply adds a second video stream to the resulting file. Playing it with VLC makes the player open two separate VLC instances.. no overlay at all. Is there a way to make VLC show two separate videos concurrently in the same window ?

• FFMpeg convert VOB to H264 and multi language

  26 octobre 2016, par gduh

  I try to convert VOB files to H264. I know it seems to be crazy to do that but the goal is to use it with the Apple TV.

  To just converting a VOB file to mp4 with the right audio stream is not really a problem.

  The problem is when the VOB file contains multi-sequences in different languages. For example, in the mp4’s file I will have 3 seconds of video including for example a book on the screen in english, then, the same 3 seconds with the book in french and so on...
  But with the VOB file I will have only the 3 seconds in the right language.

  When I check the VOB file, I only see one stream #0.0 for the video.

  So my question is, how can I avoid to include the differents videos sequences with these different languages ?

  Thx for your help.

• SDL-thread ffmpeg : segmentaoin fault

  29 octobre 2016, par user1683302

  i’m trying to test dranger tutorial for ffmpeg/SDL on my Ubuntu 14.04 VM. i could secssufully complie all tutorials. i could excute toutorial 1-3. However, I’m having seqmentaion fault when trying to run tutorial 4 .

  gcc -g -o tutorial04 tutorial04.c -lavutil -lavformat -lavcodec -lswscale -lz -lm `sdl-config --cflags --libs`

  here is my gdb output :

  Thread debugging using libthread_db enabled]
  
  Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
  
  [New Thread 0x7ffff3918700 (LWP 33391)]
  
  [New Thread 0x7fffec0cf700 (LWP 33392)]
  
  [Thread 0x7fffec0cf700 (LWP 33392) exited]
  
  [New Thread 0x7fffec0cf700 (LWP 33393)]
  
  
  
  Program received signal SIGSEGV, Segmentation fault.
  
  [Switching to Thread 0x7fffec0cf700 (LWP 33393)]
  
  0x00007ffff794c615 in avformat_open_input ()
  
  from /usr/local/lib/libavformat.so.54
  
  (gdb) tb
  
  Temporary breakpoint 1 at 0x7ffff794c615
  
  (gdb) bt
  
  #0  0x00007ffff794c615 in avformat_open_input ()
  
  from /usr/local/lib/libavformat.so.54
  
  #1  0x00000000004029ea in decode_thread (arg=0x7ffff7f8b040)
  
  at tutorial04.c:546
  
  #2  0x00007ffff624f728 in SDL_RunThread (data=0x641f60)
  
  at ./src/thread/SDL_thread.c:204
  
  #3  0x00007ffff6290a79 in RunThread (data=<optimised out="out">)
  
  at ./src/thread/pthread/SDL_systhread.c:47 
  
  #4  0x00007ffff5c64184 in start_thread (arg=0x7fffec0cf700)
  
  at pthread_create.c:312
  
  #5  0x00007ffff5f7437d in clone ()
  
  at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
  
  </optimised>

  the tutorial has been test to work with these library versions
  LAVC 54.59.100, LAVF 54.29.104, LSWS 2.1.101, SDL 1.2.15
  .I had to install exactly the same version to get the codes complied as i explained here

  I use SDL 1.2.15 which also was used to test the code by the Author.

  any Idea why having this problem ?

  update

  I swithced to version 0.11.5 and it complied without any problem. However when playing video the picture is currpted : first frame is no keyframe