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• how to solve ffmpeg video merging complain about parameters mismatching

  22 septembre 2019, par mohammad rostami siahgeli

  I’m trying to concatenate an intro video to a main video. Here’s my command :

  ffmpeg -i C:\Temp\intro.mp4 -i C:\Temp\main.mp4 -filter_complex "[0:v:0][0:a:0][1:v:0][1:a:0]concat=n=2:v=1:a=1[outv][outa]" -map "[outv]" -map "[outa]" C:\Temp\output.mp4

  When I run this command in cmd, I get the following error :

  ffmpeg version N-95004-g2f87c9f646 Copyright (c) 2000-2019 the FFmpeg developers
  
    built with gcc 9.2.1 (GCC) 20190918
  
    configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf
  
    libavutil      56. 35.100 / 56. 35.100
  
    libavcodec     58. 58.101 / 58. 58.101
  
    libavformat    58. 33.100 / 58. 33.100
  
    libavdevice    58.  9.100 / 58.  9.100
  
    libavfilter     7. 58.102 /  7. 58.102
  
    libswscale      5.  6.100 /  5.  6.100
  
    libswresample   3.  6.100 /  3.  6.100
  
    libpostproc    55.  6.100 / 55.  6.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'C:\Temp\intro.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: mp42mp41
  
      creation_time   : 2019-09-21T09:23:34.000000Z
  
    Duration: 00:00:07.32, start: 0.000000, bitrate: 706 kb/s
  
      Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, smpte170m), 960x540, 323 kb/s, 15 fps, 15 tbr, 30k tbn, 30 tbc (default)
  
      Metadata:
  
        creation_time   : 2019-09-21T09:23:34.000000Z
  
        handler_name    : ?Mainconcept Video Media Handler
  
        encoder         : AVC Coding
  
      Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 317 kb/s (default)
  
      Metadata:
  
        creation_time   : 2019-09-21T09:23:34.000000Z
  
        handler_name    : #Mainconcept MP4 Sound Media Handler
  
  Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'C:\Temp\main.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf56.40.101
  
    Duration: 00:00:08.78, start: 0.000000, bitrate: 499 kb/s
  
      Stream #1:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 640x640 [SAR 1:1 DAR 1:1], 430 kb/s, 29.97 fps, 29.97 tbr, 11988 tbn, 59.94 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #1:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 64 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
  Stream mapping:
  
    Stream #0:0 (h264) -> concat:in0:v0
  
    Stream #0:1 (aac) -> concat:in0:a0
  
    Stream #1:0 (h264) -> concat:in1:v0
  
    Stream #1:1 (aac) -> concat:in1:a0
  
    concat:out:v0 -> Stream #0:0 (libx264)
  
    concat:out:a0 -> Stream #0:1 (aac)
  
  Press [q] to stop, [?] for help
  
  [Parsed_concat_0 @ 0000018168eedec0] Input link in0:v0 parameters (size 640x640, SAR 1:1) do not match the corresponding output link in0:v0 parameters (960x540, SAR 1:1)
  
  [Parsed_concat_0 @ 0000018168eedec0] Failed to configure output pad on Parsed_concat_0
  
  Error reinitializing filters!
  
  Failed to inject frame into filter network: Invalid argument
  
  Error while processing the decoded data for stream #1:0
  
  Conversion failed!

  I’m not a video ninja. I know parameters are different, but I have no idea after hours of search on how to solve this. A lot of online video services concatenate these two videos and give me a reasonable result. They have a GUI though. I need to do it in code, so that I can automate it.

  How can I solve these errors ?

  Update : This is the second error :

  ffmpeg version N-95004-g2f87c9f646 Copyright (c) 2000-2019 the FFmpeg developers
  
    built with gcc 9.2.1 (GCC) 20190918
  
    configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf
  
    libavutil      56. 35.100 / 56. 35.100
  
    libavcodec     58. 58.101 / 58. 58.101
  
    libavformat    58. 33.100 / 58. 33.100
  
    libavdevice    58.  9.100 / 58.  9.100
  
    libavfilter     7. 58.102 /  7. 58.102
  
    libswscale      5.  6.100 /  5.  6.100
  
    libswresample   3.  6.100 /  3.  6.100
  
    libpostproc    55.  6.100 / 55.  6.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'C:\Temp\intro.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: mp42mp41
  
      creation_time   : 2019-09-21T09:23:34.000000Z
  
    Duration: 00:00:07.32, start: 0.000000, bitrate: 706 kb/s
  
      Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, smpte170m), 960x540, 323 kb/s, 15 fps, 15 tbr, 30k tbn, 30 tbc (default)
  
      Metadata:
  
        creation_time   : 2019-09-21T09:23:34.000000Z
  
        handler_name    : ?Mainconcept Video Media Handler
  
        encoder         : AVC Coding
  
      Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 317 kb/s (default)
  
      Metadata:
  
        creation_time   : 2019-09-21T09:23:34.000000Z
  
        handler_name    : #Mainconcept MP4 Sound Media Handler
  
  Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'C:\Temp\main.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf56.40.101
  
    Duration: 00:00:08.78, start: 0.000000, bitrate: 499 kb/s
  
      Stream #1:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 640x640 [SAR 1:1 DAR 1:1], 430 kb/s, 29.97 fps, 29.97 tbr, 11988 tbn, 59.94 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #1:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 64 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
  File 'C:\Temp\output.mp4' already exists. Overwrite ? [y/N] Y
  
  Stream mapping:
  
    Stream #0:0 (h264) -> scale
  
    Stream #0:1 (aac) -> concat:in0:a0
  
    Stream #1:0 (h264) -> concat:in1:v0
  
    Stream #1:1 (aac) -> concat:in1:a0
  
    concat:out:v0 -> Stream #0:0 (libx264)
  
    concat:out:a0 -> Stream #0:1 (aac)
  
  Press [q] to stop, [?] for help
  
  [mp4 @ 000002f17869d7c0] Frame rate very high for a muxer not efficiently supporting it.
  
  Please consider specifying a lower framerate, a different muxer or -vsync 2
  
  [libx264 @ 000002f178acfec0] using SAR=1/1
  
  [libx264 @ 000002f178acfec0] MB rate (1600000000) > level limit (16711680)
  
  [libx264 @ 000002f178acfec0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
  
  [libx264 @ 000002f178acfec0] profile High, level 6.2, 4:2:0, 8-bit
  
  [libx264 @ 000002f178acfec0] 264 - core 158 r2984 3759fcb - H.264/MPEG-4 AVC codec - Copyleft 2003-2019 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=12 lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  More than 1000 frames duplicated
  
  Too many packets buffered for output stream 0:0.
  
  [libx264 @ 000002f178acfec0] frame I:1     Avg QP:16.45  size:  4679
  
  [libx264 @ 000002f178acfec0] frame P:32    Avg QP:14.16  size:    33
  
  [libx264 @ 000002f178acfec0] frame B:96    Avg QP:17.67  size:    30
  
  [libx264 @ 000002f178acfec0] consecutive B-frames:  0.8%  0.0%  0.0% 99.2%
  
  [libx264 @ 000002f178acfec0] mb I  I16..4: 58.1% 34.8%  7.1%
  
  [libx264 @ 000002f178acfec0] mb P  I16..4:  0.1%  0.0%  0.0%  P16..4:  0.0%  0.0%  0.0%  0.0%  0.0%    skip:99.9%
  
  [libx264 @ 000002f178acfec0] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  0.8%  0.0%  0.0%  direct: 0.0%  skip:99.2%  L0: 0.0% L1:100.0% BI: 0.0%
  
  [libx264 @ 000002f178acfec0] 8x8 transform intra:33.8%
  
  [libx264 @ 000002f178acfec0] coded y,uvDC,uvAC intra: 4.6% 8.2% 7.3% inter: 0.0% 0.0% 0.0%
  
  [libx264 @ 000002f178acfec0] i16 v,h,dc,p: 74% 22%  5%  0%
  
  [libx264 @ 000002f178acfec0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu:  1% 16% 83%  0%  0%  0%  0%  0%  0%
  
  [libx264 @ 000002f178acfec0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 24% 17% 26%  7%  5%  5%  5%  6%  5%
  
  [libx264 @ 000002f178acfec0] i8c dc,h,v,p: 93%  3%  3%  1%
  
  [libx264 @ 000002f178acfec0] Weighted P-Frames: Y:0.0% UV:0.0%
  
  [libx264 @ 000002f178acfec0] ref P L0: 62.5% 37.5%
  
  [libx264 @ 000002f178acfec0] ref B L1: 99.8%  0.2%
  
  [libx264 @ 000002f178acfec0] kb/s:535069.75
  
  Conversion failed!

• Send AVPacket over Network

  2 décembre 2019, par Yondonator

  I’m generating AVPackets with an encoder with ffmpeg and now I want to send them with UDP to another Computer and show them there.
  The problem is I don’t know how to convert the packet to bytes and back. I tried this to copy the package :

  AVPacket newPacket = avcodec.av_packet_alloc();
  
  
  
  
  
  ByteBuffer byteBuffer = packet.buf().buffer().asByteBuffer();
  
  int bufferSize = byteBuffer.capacity();
  
  byte bytes[] = new byte[bufferSize];
  
  byteBuffer.get(bytes);
  
  AVBufferRef newBufferRef = avutil.av_buffer_alloc(bufferSize);
  
  newBufferRef.data(new BytePointer(bytes));
  
  newPacket.buf(newBufferRef);
  
  
  
  
  
  ByteBuffer dataBuffer = packet.data().asByteBuffer();
  
  int dataSize = dataBuffer.capacity();
  
  byte dataBytes[] = new byte[dataSize];
  
  dataBuffer.get(dataBytes);
  
  BytePointer dataPointer = new BytePointer(dataBytes);
  
  newPacket.data(dataPointer);
  
  
  
  
  
  newPacket.dts(packet.dts());
  
  newPacket.duration(packet.duration());
  
  newPacket.flags(packet.flags());
  
  newPacket.pos(packet.pos());
  
  newPacket.pts(packet.pts());
  
  newPacket.side_data_elems(0);
  
  newPacket.size(packet.size());
  
  newPacket.stream_index(packet.stream_index());
  
  
  
  
  
  videoPlayer.sendPacket(newPacket);

  This gives me this Error :

  [h264 @ 0000018951be8440] Invalid NAL unit size (3290676 > 77).
  
  [h264 @ 0000018951be8440] Error splitting the input into NAL units.
  
  [h264 @ 0000018951bf6480] Invalid NAL unit size (15305314 > 163).
  
  [h264 @ 0000018951bf6480] Error splitting the input into NAL units.

  The problem is newPacket.data(). When I set it directly : newPacket.data(packet.data())
  it works. Also packet.data().asByteBuffer().capacity() returns 1 and packet.data().capacity() returns 0.

  This is my method that creates the decoder :

  private void startUnsafe() throws Exception
  
      {
  
          int result;
  
  
  
          convertContext = null;
  
          codec = null;
  
          codecContext = null;
  
          AVFrame = null;
  
          RGBAVFrame = null;
  
          frame = new Frame();
  
  
  
          codec = avcodec_find_decoder(codecID);
  
          if(codec == null)
  
          {
  
              throw new Exception("Unable to find decoder");
  
          }
  
  
  
          codecContext = avcodec_alloc_context3(codec);
  
          if(codecContext == null)
  
          {
  
              releaseUnsafe();
  
              throw new Exception("Unable to alloc codec context!");
  
          }
  
  
  
          AVCodecParameters para = avcodec_parameters_alloc();
  
          para.bit_rate(streamBitrate);
  
          para.width(streamWidth);
  
          para.height(streamHeight);
  
          para.codec_id(codecID);
  
          para.codec_type(AVMEDIA_TYPE_VIDEO);
  
          try
  
          {
  
              byte extradataByte[] = Files.readAllBytes(new File("extradata.byte").toPath());
  
              para.extradata(new BytePointer(extradataByte));
  
              para.extradata_size(extradataByte.length);
  
          }
  
          catch (IOException e1)
  
          {
  
              e1.printStackTrace();
  
              throw new Exception("extradata file not available");
  
          }
  
  
  
          result = avcodec_parameters_to_context(codecContext, para);
  
          if(result < 0)
  
          {
  
              throw new Exception("Unable to copy parameters to context! [" + result + "]");
  
          }
  
  
  
          codecContext.thread_count(0);
  
  
  
          result = avcodec_open2(codecContext, codec, new AVDictionary());
  
          if(result < 0)
  
          {
  
              releaseUnsafe();
  
              throw new Exception("Unable to open codec context![" + result + "]");
  
          }
  
  
  
          AVFrame = av_frame_alloc();
  
          if(AVFrame == null)
  
          {
  
              releaseUnsafe();
  
              throw new Exception("Unable to alloc AVFrame!");
  
          }
  
  
  
          RGBAVFrame = av_frame_alloc();
  
          if(RGBAVFrame == null)
  
          {
  
              releaseUnsafe();
  
              throw new Exception("Unable to alloc AVFrame!");
  
          }
  
          initRGBAVFrame();
  
  
  
          TimerTask task = new TimerTask() {
  
  
  
              @Override
  
              public void run()
  
              {
  
                  timerTask();
  
              }
  
          };
  
          timer = new Timer();
  
          timer.scheduleAtFixedRate(task, 0, (long) (1000/streamFramerateDouble));
  
  
  
          window.setVisible(true);
  
      }

  The file extradata.byte has some bytes that I got from another video, because without them it doesn’t work too.

  EDIT :

  package org.stratostream.streaming;
  
  
  
  import java.nio.ByteBuffer;
  
  
  
  
  
  import org.bytedeco.javacpp.BytePointer;
  
  import org.bytedeco.javacpp.Pointer;
  
  import org.bytedeco.javacpp.avcodec;
  
  import org.bytedeco.javacpp.avutil;
  
  import org.bytedeco.javacpp.avcodec.AVPacket;
  
  import org.bytedeco.javacpp.avcodec.AVPacketSideData;
  
  
  
  
  
  public class PacketIO {
  
  
  
  
  
      public static final int SIDE_DATA_FIELD = 0;
  
      public static final int SIDE_ELEMENTS_FIELD = 4;
  
      public static final int SIDE_TYPE_FIELD = 8;
  
      public static final int DTS_FIELD = 12;
  
      public static final int PTS_FIELD = 20;
  
      public static final int FLAGS_FIELD = 28;
  
      public static final int DATA_OFFSET = 32;
  
  
  
      public static byte[] toByte(AVPacket packet) throws Exception
  
      {
  
          int dataSize = packet.size();
  
          ByteBuffer dataBuffer = packet.data().capacity(dataSize).asByteBuffer();
  
          byte dataBytes[] = new byte[dataSize];
  
          dataBuffer.get(dataBytes);
  
  
  
          AVPacketSideData sideData = packet.side_data();
  
          int sideSize = sideData.size();
  
          ByteBuffer sideBuffer = sideData.data().capacity(sideSize).asByteBuffer();
  
          byte sideBytes[] = new byte[sideSize];
  
          sideBuffer.get(sideBytes);
  
  
  
          int sideOffset = DATA_OFFSET + dataSize;
  
          int resultSize = sideOffset + sideSize;
  
          byte resultBytes[] = new byte[resultSize];
  
          System.arraycopy(dataBytes, 0, resultBytes, DATA_OFFSET, dataSize);
  
          System.arraycopy(sideBytes, 0, resultBytes, sideOffset, sideSize);
  
          resultBytes[SIDE_DATA_FIELD] = (byte) (sideOffset >>> 24);
  
          resultBytes[SIDE_DATA_FIELD+1] = (byte) (sideOffset >>> 16);
  
          resultBytes[SIDE_DATA_FIELD+2] = (byte) (sideOffset >>> 8);
  
          resultBytes[SIDE_DATA_FIELD+3] = (byte) (sideOffset >>> 0);
  
  
  
          int sideType = sideData.type();
  
          intToByte(resultBytes, SIDE_TYPE_FIELD, sideType);
  
  
  
          int sideElements = packet.side_data_elems();
  
          intToByte(resultBytes, SIDE_ELEMENTS_FIELD, sideElements);
  
  
  
          long dts = packet.dts();
  
          longToByte(resultBytes, DTS_FIELD, dts);
  
  
  
          long pts = packet.pts();
  
          longToByte(resultBytes, PTS_FIELD, pts);
  
  
  
          int flags = packet.flags();
  
          intToByte(resultBytes, FLAGS_FIELD, flags);
  
  
  
          return resultBytes;
  
      }
  
  
  
      public static AVPacket toPacket(byte bytes[]) throws Exception
  
      {
  
          AVPacket packet = avcodec.av_packet_alloc();
  
  
  
          int sideOffset = byteToInt(bytes, SIDE_DATA_FIELD);
  
          int sideElements = byteToInt(bytes, SIDE_ELEMENTS_FIELD);
  
          int sideType = byteToInt(bytes, SIDE_TYPE_FIELD);
  
          int dataSize = sideOffset - DATA_OFFSET;
  
          int sideSize = bytes.length - sideOffset;
  
  
  
          long pts = byteToLong(bytes, PTS_FIELD);
  
          long dts = byteToLong(bytes, DTS_FIELD);
  
          int flags = byteToInt(bytes, FLAGS_FIELD);
  
  
  
          packet.pts(pts);
  
          packet.dts(dts);
  
          packet.flags(flags);
  
  
  
  
  
          Pointer newDataPointer =  avutil.av_malloc(bytes.length);
  
          BytePointer dataPointer = new BytePointer(newDataPointer);
  
          byte dataBytes[] = new byte[dataSize];
  
          System.arraycopy(bytes, DATA_OFFSET, dataBytes, 0, dataSize);
  
          dataPointer.put(dataBytes);
  
          packet.data(dataPointer);
  
          packet.size(dataSize);
  
  
  
          Pointer newSidePointer = avutil.av_malloc(sideSize);
  
          BytePointer sidePointer = new BytePointer(newSidePointer);
  
          byte sideBytes[] = new byte[sideSize];
  
          System.arraycopy(bytes, sideOffset, sideBytes, 0, sideSize);
  
          sidePointer.put(sideBytes);
  
          AVPacketSideData sideData = new AVPacketSideData();
  
          sideData.data(sidePointer);
  
          sideData.type(sideType);
  
          sideData.size(sideSize);
  
          //packet.side_data(sideData);
  
          //packet.side_data_elems(sideElements);
  
  
  
          return packet;
  
      }
  
  
  
      private static void intToByte(byte[] bytes, int offset, int value)
  
      {
  
          bytes[offset] = (byte) (value >>> 24);
  
          bytes[offset+1] = (byte) (value >>> 16);
  
          bytes[offset+2] = (byte) (value >>> 8);
  
          bytes[offset+3] = (byte) (value >>> 0);
  
      }
  
  
  
      private static void longToByte(byte[] bytes, int offset, long value)
  
      {
  
          bytes[offset] = (byte) (value >>> 56);
  
          bytes[offset+1] = (byte) (value >>> 48);
  
          bytes[offset+2] = (byte) (value >>> 40);
  
          bytes[offset+3] = (byte) (value >>> 32);
  
          bytes[offset+4] = (byte) (value >>> 24);
  
          bytes[offset+5] = (byte) (value >>> 16);
  
          bytes[offset+6] = (byte) (value >>> 8);
  
          bytes[offset+7] = (byte) (value >>> 0);
  
      }
  
  
  
      private static int byteToInt(byte[] bytes, int offset)
  
      {
  
          return (bytes[offset]<<24)&0xff000000|(bytes[offset+1]<<16)&0x00ff0000|(bytes[offset+2]<<8)&0x0000ff00|(bytes[offset+3]<<0)&0x000000ff;
  
      }
  
  
  
      private static long byteToLong(byte[] bytes, int offset)
  
      {
  
          return (bytes[offset]<<56)&0xff00000000000000L|(bytes[offset+1]<<48)&0x00ff000000000000L|(bytes[offset+2]<<40)&0x0000ff0000000000L|(bytes[offset+3]<<32)&0x000000ff00000000L|(bytes[offset+4]<<24)&0x00000000ff000000L|(bytes[offset+5]<<16)&0x0000000000ff0000L|(bytes[offset+6]<<8)&0x000000000000ff00L|(bytes[offset+7]<<0)&0x00000000000000ffL;
  
      }
  
  
  
  }

  Now I have this class that works fine on the same programm, but when I send the bytes over the network I get a bad output and this error is printed to the console :

  [h264 @ 00000242442acc40] Missing reference picture, default is 72646
  
  [h264 @ 000002424089de00] Missing reference picture, default is 72646
  
  [h264 @ 000002424089e3c0] mmco: unref short failure
  
  [h264 @ 000002424081a580] reference picture missing during reorder
  
  [h264 @ 000002424081a580] Missing reference picture, default is 72652
  
  [h264 @ 000002424082c400] mmco: unref short failure
  
  [h264 @ 000002424082c400] co located POCs unavailable
  
  [h264 @ 000002424082c9c0] co located POCs unavailable
  
  [h264 @ 00000242442acc40] co located POCs unavailable
  
  [h264 @ 000002424089de00] mmco: unref short failure

  I think its because I dont set the sidedata field but when I try to set it the encoder crashes with the second packet.

  The output looks like this :
  Decoder Output

• How to get 20 screenshots from a video with tile or mosiac effect ffmpeg ?

  2 octobre 2019, par Nane

  I am trying to get 20(Will take screens at 5%, 10%, 15%, 20%,.., of the video) screenshot which will be arranged in a single image like this Link

  I found this command but it is taking screenshot based on frames like 1000 I want to get evenly distributed 20 screenshots of the entire video

  ffmpeg -ss 00:00:10 -i movie.avi -frames 1 -vf "select=not(mod(n\,1000)),scale=320:240,tile=2x3" out.png