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• ffmpeg : input rate and output rate not respected

  2 novembre 2022, par Gregory

  I am using ffmpeg to overlay PNG and gifs while trying to preserve the same framerate and delay of the GIFs. The gif files all have the same number of frames (5) and a 13ms delay between each frame.

  


  Attempt #1 :

  


  ffmpeg 
   -r 5 -i ./Salmonbg.png 
   -r 5 -i ./Pinkfur.gif 
   -r 5 -i ./Cap.gif 
   -r 5 -i ./Glasses.gif 
   -r 5 -i Bone.gif 
   -filter_complex "[0:v][1:v]overlay=format=auto[v1];[v1][2:v]overlay=format=auto[v2];[v2][3:v]overlay=format=auto[v3];[v3][4:v]overlay=format=auto[v4];[v4]split[s0][s1];[s0]palettegen[p];[s1][p]paletteuse" 
   -r 1000/130 preview.gif


  


  The command above will generate with the correct frame alignment from the png + gifs, however output frame delay incorrect :

  


  Frame #1: 260 <- WRONG (Why???)
Frame #2: 130
Frame #3: 260 <- WRONG (Why???)
Frame #4: 130
Frame #5: 130


  


  Attempt #2 :

  


  ffmpeg 
   -i ./Salmonbg.png 
   -i ./Pinkfur.gif 
   -i ./Cap.gif 
   -i ./Glasses.gif 
   -i Bone.gif 
   -filter_complex "[0:v][1:v]overlay=format=auto[v1];[v1][2:v]overlay=format=auto[v2];[v2][3:v]overlay=format=auto[v3];[v3][4:v]overlay=format=auto[v4];[v4]split[s0][s1];[s0]palettegen[p];[s1][p]paletteuse" 
   -r 1000/130 preview.gif


  


  The command above will output the correct frame delay, 13ms for all of them. However, the output gif will not use the first frame of each GIF. The second frame is used twice basically.

  


  Any idea what I am missing ? I feel like i'm 90% there but i can't figure out what i'm doing incorrectly.

  


• ffprobe reading wrong frame rate, any workarounds besides MediaInfo ?

  20 mai 2023, par Minty

  I want to check the frame rate of many videos. I decided to employ ffprobe :

  


  ffprobe -v error -select_streams v -of default=noprint_wrappers=1:nokey=1 -show_entries stream=r_frame_rate faulty.mkv =

  


  500/21


  


  That can't be right, what kind of fps is 500/21 ?

  


  ffprobe faulty.mkv (version 4.3.5-0+deb11u1+rpt3)

  


  Stream #0:0: Video: (...), 23.81 fps, 23.81 tbr, 1k tbn, 23.98 tbc (default)


  


  At least ffprobe 4 read the correct codec timescale i.e. 23.98 tbc (default), but in later versions tbc has been deprecated :

  


  Stream #0:0: Video: (...), 23.81 fps, 23.81 tbr, 1k tbn (default)


  


  However, MediaInfo gets it right :

  


  mediainfo faulty.mkv =

  


  (...)
Frame rate mode                          : Constant
Frame rate                               : 23.976 (24000/1001) FPS
(...)


  


  I tried using -count_packets to then divide nb_read_packets of the stream by the duration of the file, I'm getting 1 second per hour error. This is much better compared to 23,8095, but packets are not frames, and only the prohibitively, unusably slow -count_frames gets me the exact value.

  


  The rest of my workflow uses ffprobe, so I'm reluctant to switch to MediaInfo completely. I get that the file is, well, faulty, but if mediainfo can do it, is there a way to make sure the correct frame rate is read with ffprobe without decoding the entire file as -count_frames seems to do ?

  


• Cannot open RTMP stream with FFMPEG Java Cannot assign requested address

  12 novembre 2023, par lastpeony4

  I am trying to open an RTMP stream with avformat_open_input and for some reason i keep getting Cannot assign requested address error.
  
My RTMP URL is correct because i can watch the stream using VLC Player and ffmpeg command line :
  
ffmpeg -i rtmp://1.1.1.1/app/teststream -vcodec copy -acodec copy output.mp4

  


  int timeout = 2500;
setConnectionTimeout(timeout);

AVDictionary optionsDictionary = new AVDictionary();

String timeoutStr = String.valueOf(this.timeoutMicroSeconds);
av_dict_set(optionsDictionary, "timeout", timeoutStr, 0);

int analyzeDurationUs = 1500 * 1000;
String analyzeDuration = String.valueOf(analyzeDurationUs);
av_dict_set(optionsDictionary, "analyzeduration", analyzeDuration, 0);

int ret;

if ((ret = avformat_open_input(inputFormatContext, streamUrl, null, optionsDictionary)) < 0) {
  // ERROR Cannot assign requested address
}


  


  I am using org.bytedeco:ffmpeg:5.1.2-1.5.8 (ffmpeg-5.1.2-1.5.8.jar)

  


  Why i can't open it ?