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• ffmpeg code error in creating timelapse video from images

  18 juin 2021, par Ruiqing Wu

  My codes below used to work :

  


  ffmpeg -y -framerate 25 -start_number 0 -i "a_%08d.jpg" -c:v libx264 -vf scale=-1:1500 -pix_fmt yuv420p d:\mystars.mp4


  


  But it now shows error in my new computer with error :

  


  [image2 @ 000001ae31e2e600] Could find no file with path 'a_%08d.jpg' and index in the range 0-4
a_%08d.jpg: No such file or directory


  


  My images are under D:\mystars. All are jpg files named from a__00000000.jpg to a__00000099.jpg.

  


  May I have some advice here ?

  


• What Does FFmpeg Exit Code -1073741819 Mean ?

  11 février 2020, par user2248702

  I’m using FFmpeg 4.2.2 on Windows to mix two audio tracks, however the filter I am using is causing FFmpeg to crash :

  ffmpeg -i 1.wav -i 2.wav -filter_complex asplit[a][b];[a]amix[c];[c][b]acrossfade 3.wav

  After running the command FFmpeg hangs for a couple of seconds then closes. Using echo %ERRORLEVEL% shows the error code is -1073741819, but I can’t seem to find anything on what it means.

• avformat code produce slightly different output than ffmpeg with same parameters - why ?

  20 février 2020, par Daniel

  I would like to achieve the exact same result as this ffmpeg command line call does from code :

  ffmpeg -i CAMERARTSPLINK -c:v copy -an -movflags +frag_keyframe+empty_moov -f mp4

  When I run the above command it gives this binary result :

  got 36 bytes:  0, 0, 0, 36, 102, 116, 121, 112, ..., 111, 54, 109, 112, 52, 49, 
  
  got 512 bytes: 0, 0, 3, 76, 109, 111, 111, 118, 0, 0, 0, ..., 132, 0, 0, 3, 0, 4, 0, 0, 3, 0, 202,

  The code can utilize ffmpeg libraries and includes, but I don’t want to use ffmpeg as a program call (i.e. exec* functions are not preferred).

  I have created a small demonstration code example with avformat for an RTSP H264 to MP4 remux.
  The code is highly reuses horgh’s nice videostreamer library.

  I posted the sample code to pastebin.com (400 loc). It builds successfully but you need to link it against avformat, avdevice, avcodec and avutil.

  I tried to do my best to reach the same result, however when I run this code, the first few bytes after byte #38 are different (maybe not just those, I did not compare anything after byte #548) :

  writeOutput: writing 36 bytes: 0, 0, 0, 36, 102, 116, 121, 112, ..., 111, 54, 109, 112, 52, 49, 
  
  writeOutput: writing 512 bytes: 0, 0, 0, 0, 109, 111, 111, 118, 0, 0, 0, ..., 132, 0, 0, 3, 0, 4, 0, 0, 3, 0, 202, 

  You can see on the second line of my code’s output starts with 0 0 0 0 109,

  whereas the ffmpeg gave 0 0 3 76 109.

  All the rest (even the bytes are not pasted here) data are totally the same (at least for the first 548 bytes).

  What is wrong with my code ? These 2 bytes seems super-important for decoding this stream.