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• ffmpeg pipe:0 : could not find codec parameters

  13 octobre 2016, par dre

  When i run this command i get an error. If i run without the pipe, it works.

  With Pipe

  cat mymovie.m4v | ffmpeg -i pipe:0 -an -analyzeduration 1000000 -f image2 -vf 
  
  "select='eq(pict_type,PICT_TYPE_I)'" -vsync vfr 'public/files/thumb%04d.png'

  Without Pipe (Works)

  ffmpeg -i mymovie.m4v -an -analyzeduration 2147483647 -probesize 2147483647 -f image2 -vf 
  
  "select='eq(pict_type,PICT_TYPE_I)'" -vsync vfr 'public/files/thumb%04d.png'

  Output

  ffmpeg version 2.2 Copyright (c) 2000-2014 the FFmpeg developers
  
  built on Apr 10 2014 17:50:46 with Apple LLVM version 5.1 (clang-503.0.38) 
  
  (based on LLVM 3.4svn)
  
  configuration: --prefix=/usr/local/Cellar/ffmpeg/2.2 
  
  --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-nonfree 
  
  --enable-hardcoded-tables --enable-avresample --enable-vda --cc=clang 
  
  --host-cflags= --host-ldflags= --enable-libx264 --enable-libfaac --enable-libmp3lame 
  
  --enable-libxvid --enable-libfreetype --enable-libtheora --enable-libvorbis 
  
  --enable-libvpx --enable-librtmp --enable-libopencore-amrnb --enable-libopencore-amrwb
  
  --enable-libvo-aacenc --enable-libass --enable-ffplay --enable-libspeex 
  
  --enable-libschroedinger --enable-libfdk-aac --enable-libopus --enable-frei0r 
  
  --enable-libopenjpeg --extra-cflags='-
  
  
  
  I/usr/local/Cellar/openjpeg/1.5.1_1/include/openjpeg-1.5 '
  
    libavutil      52. 66.100 / 52. 66.100
  
    libavcodec     55. 52.102 / 55. 52.102
  
    libavformat    55. 33.100 / 55. 33.100
  
    libavdevice    55. 10.100 / 55. 10.100
  
    libavfilter     4.  2.100 /  4.  2.100
  
    libavresample   1.  2.  0 /  1.  2.  0
  
    libswscale      2.  5.102 /  2.  5.102
  
    libswresample   0. 18.100 /  0. 18.100
  
    libpostproc    52.  3.100 / 52.  3.100
  
  
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fd87b80f000] stream 0, offset 0x2c: partial file
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fd87b80f000] Could not find codec parameters for stream 0
  
  (Video: h264 (avc1 / 0x31637661), 1280x720, 3310 kb/s): unspecified pixel format

  Consider increasing the value for the ’analyzeduration’ and ’probesize’ options
  pipe:0 : could not find codec parameters

  I have tried setting (link)

  -analyzeduration100 -probesize 10000000 
  
  -analyzeduration 2147483647 -probesize 2147483647

  Still didn’t work.

• How to find the presentation time stamp of a given frame number for FFMPEG decoding ?

  21 août 2017, par Deepankar Arya

  I am using the C APIs of ffmpeg for some video processing. My aim is to extract the screen shot of a given frame number. I have understood that ffmpeg has an av_seek_frame function to seek to a given timestamp(expressed in appropriated base units of the video stream). I assume that I will have to goto to the most recent I frame for the given frame(using the AVSEEK_FLAG_BACKWARD flag) and read onwards untill I meet the required frame. For that I need to give a seek time stamp to the av_seek_frame function. My main issue is that given a frame number, how do I find an associated presentation time stamp to seek to ?

• hevc Could not find ref with POC 34

  14 août 2023, par Rushikesh Date
  


  1. I am trying to send Rtsp video (comes from RTSP camera URL) to the ANT media server.

     


  


  2. I am using LibVLC to play video locally in app.

     


  


  3. And I am using FFMPEG library for sending the RTSP url video to the ANT media server But In initial 20 seconds this corrupted frame appear. and following error comes in logs
     
"[hevc @ 0xe86ff800] Could not find ref with POC 34"This is the corrupted frame appear in between video

     


  


  


  The RTSP video Url should play smoothly on Ant media server without any interruption.

  


    `String[] cmd = {
                "-rtsp_transport",
                "tcp", // Choose appropriate transport (e.g., "udp" or "tcp")
                "-i",
               "rtsp://127.0.0.1:8554/main.898", // Source RTSP stream URL
                "-filter:v",
                "scale=1280:720",
                "-c:v",
                "libx264", // Video codec for transcoding (you can choose other codecs if needed)
                "-preset",
                "ultrafast", // Video preset for transcoding speed (adjust as needed)
                "-max_delay",
                "1000000",
                "-an",
                "-f",
                "flv", // Output format, RTMP requires FLV container
               "rtmp://streamingServer.com/LiveApp/gdyggcshvcvhcvv " // Ant Media Server RTMP endpoint
        };

        try {
            // Execute FFmpeg command
            fFmpeg.execute(cmd, new FFmpegExecuteResponseHandler() {
                @Override
                public void onSuccess(String message) {
                }
                @Override
                public void onProgress(String message) {
                }
                @Override
                public void onFailure(String message) {
            
                }
                @Override
                public void onStart() {
                }
                @Override
                public void onFinish() {
                
                }
            });
        } catch (FFmpegCommandAlreadyRunningException e) {
            Log.e("FFmpeg", String.valueOf(e));
            // Handle FFmpeg command already running error
        }`