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• Video is cut after adding 2 watermarks with FFMPEG-KIT [closed]

  7 août 2023, par dfjick

  I made a FFMPEG-KIT command to add 2 PNG watermarks to the video and everything went smoothly.

  


  String ffmpegCommand = "-y -i " + videoPath +
            " -i " + watermarkImagePath +
            " -i " + userID +
            " -filter_complex " +
            "\"[0:v][1:v]overlay=x='if(lt(mod(t,10),5),10,W-w-10)':y='if(lt(mod(t,10),5),10,H-h-35)',\"" +
            "\"overlay=x='if(lt(mod(t,10),5),7,W-w-7)':y='if(lt(mod(t,10),5),165,H-h-15)'[out]\"" +
            " -map [out] -map 0:a -c:v libx264 -crf 18 -preset slow -c:a aac " + outputPath;


  


  But for videos that are longer than 20 seconds, the results don't match the original video, sometimes the videos are only <20 seconds and at random times.

  &#xA;

  I get this error, how do I fix it ?

  &#xA;

  W/ffmpeg-kit: [mov,mp4,m4a,3gp,3g2,mj2 @ 0xb400007c5c1243f0] Packet corrupt (stream = 1, dts = 366976)
W/ffmpeg-kit: [mov,mp4,m4a,3gp,3g2,mj2 @ 0xb400007c5c1243f0] .
E/ffmpeg-kit: [NULL @ 0xb400007c6c179400] Invalid NAL unit size (63547 > 20190).
E/ffmpeg-kit: [NULL @ 0xb400007c6c179400] missing picture in access unit with size 20194
W/ffmpeg-kit: /storage/emulated/0/DCIM/android_100394_20230807_162805_5465009.mp4: corrupt input packet in stream 1
E/ffmpeg-kit: [h264 @ 0xb400007c6c210750] Invalid NAL unit size (63547 > 20190).
E/ffmpeg-kit: [h264 @ 0xb400007c6c210750] Error splitting the input into NAL units.
E/ffmpeg-kit: Error while decoding stream #0:1: Invalid data found when processing input


  &#xA;

  I've tried to use this -fflags +discardcorrupt, but the result is still the same. The duration of the video that has been watermarked does not match the original video.

  &#xA;

• FFMPEG-KIT - Video is cut after adding 2 watermarks

  7 août 2023, par dfjick

  I made a FFMPEG-KIT command to add 2 PNG watermarks to the video and everything went smoothly.

  &#xA;

  String ffmpegCommand = "-y -i " + videoPath +
            " -i " + watermarkImagePath +
            " -i " + userID +
            " -filter_complex " +
            "\"[0:v][1:v]overlay=x='if(lt(mod(t,10),5),10,W-w-10)':y='if(lt(mod(t,10),5),10,H-h-35)',\"" +
            "\"overlay=x='if(lt(mod(t,10),5),7,W-w-7)':y='if(lt(mod(t,10),5),165,H-h-15)'[out]\"" +
            " -map [out] -map 0:a -c:v libx264 -crf 18 -preset slow -c:a aac " + outputPath;


  &#xA;

  But for videos that are longer than 20 seconds, the results don't match the original video, sometimes the videos are only <20 seconds and at random times.

  &#xA;

  but i got this error, do you guys know how to fix it ?

  &#xA;

  W/ffmpeg-kit: [mov,mp4,m4a,3gp,3g2,mj2 @ 0xb400007c5c1243f0] Packet corrupt (stream = 1, dts = 366976)
W/ffmpeg-kit: [mov,mp4,m4a,3gp,3g2,mj2 @ 0xb400007c5c1243f0] .
E/ffmpeg-kit: [NULL @ 0xb400007c6c179400] Invalid NAL unit size (63547 > 20190).
E/ffmpeg-kit: [NULL @ 0xb400007c6c179400] missing picture in access unit with size 20194
W/ffmpeg-kit: /storage/emulated/0/DCIM/android_100394_20230807_162805_5465009.mp4: corrupt input packet in stream 1
E/ffmpeg-kit: [h264 @ 0xb400007c6c210750] Invalid NAL unit size (63547 > 20190).
E/ffmpeg-kit: [h264 @ 0xb400007c6c210750] Error splitting the input into NAL units.
E/ffmpeg-kit: Error while decoding stream #0:1: Invalid data found when processing input


  &#xA;

  I've tried to use this -fflags +discardcorrupt, but the result is still the same. the duration of the video that has been watermarked does not match the original video

  &#xA;

• FFmpeg av_read_frame returns packets from audio stream

  1er août 2018, par yultan

  I am currently trying to learn the FFmpeg API, following this tutorial. However, I already have issues with the first lesson on video decoding. My code is basically the same as the one from the tutorial except I am using C++. My issue is that the video stream does not match the one from the packet returned by av_read_frame.

  The video stream is obtained looping on the available streams until the video stream is found.

  for(int i = 0; i < pFormatCtx->nb_streams; i++) { // nb_streams == 2
  
  
  
      if(pFormatCtx->streams[i]->codec->codec_type==AVMEDIA_TYPE_VIDEO) {
  
          videoStream = i; 
  
          break; // videoStream == 0
  
      }
  
  }

  Then when retrieving the frame data, it seams grabbing the audio channel.

  while(av_read_frame(pFormatCtx, &packet) >= 0) { // read returns 0
  
  
  
      // Is this a packet from the video stream?
  
      if(packet.stream_index == videoStream) { 
  
          //packet.stream_index == 1, which correspond to the audio stream
  
      } 
  
  }

  I have not found examples online where this test is actually failing. Have I miss some way to specify the stream_index that is not in the tutorial ? Maybe the tutorial is not up to date and is doing something wrong ? If so, what is the correct way to extract the frame data ? In case that matters, I am using the latest FFmpeg 4.0.2 build, on Windows 64-bits, compiling with Visual Studio 2017.

  On videos with no sound, the two streams match and I am able to decode and display the frames correctly.