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• Encoding raw YUV420P to h264 with AVCodec on iOS

  4 janvier 2013, par Wade

  I am trying to encode a single YUV420P image gathered from a CMSampleBuffer to an AVPacket so that I can send h264 video over the network with RTMP.

  The posted code example seems to work as avcodec_encode_video2 returns 0 (Success) however got_output is also 0 (AVPacket is empty).

  Does anyone have any experience with encoding video on iOS devices that might know what I am doing wrong ?

  - (void) captureOutput:(AVCaptureOutput *)captureOutput
  
   didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer
  
          fromConnection:(AVCaptureConnection *)connection {
  
  
  
    // sampleBuffer now contains an individual frame of raw video frames
  
    CVPixelBufferRef pixelBuffer = CMSampleBufferGetImageBuffer(sampleBuffer);
  
  
  
    CVPixelBufferLockBaseAddress(pixelBuffer, 0);
  
  
  
    // access the data
  
    int width = CVPixelBufferGetWidth(pixelBuffer);
  
    int height = CVPixelBufferGetHeight(pixelBuffer);
  
    int bytesPerRow = CVPixelBufferGetBytesPerRowOfPlane(pixelBuffer, 0);
  
    unsigned char *rawPixelBase = (unsigned char *)CVPixelBufferGetBaseAddressOfPlane(pixelBuffer, 0);
  
  
  
  
  
    // Convert the raw pixel base to h.264 format
  
    AVCodec *codec = 0;
  
    AVCodecContext *context = 0;
  
    AVFrame *frame = 0;
  
    AVPacket packet;
  
  
  
    //avcodec_init();
  
    avcodec_register_all();
  
    codec = avcodec_find_encoder(AV_CODEC_ID_H264);
  
  
  
    if (codec == 0) {
  
      NSLog(@"Codec not found!!");
  
      return;
  
    }
  
  
  
    context = avcodec_alloc_context3(codec);
  
  
  
    if (!context) {
  
      NSLog(@"Context no bueno.");
  
      return;
  
    }
  
  
  
    // Bit rate
  
    context->bit_rate = 400000; // HARD CODE
  
    context->bit_rate_tolerance = 10;
  
    // Resolution
  
    context->width = width;
  
    context->height = height;
  
    // Frames Per Second
  
    context->time_base = (AVRational) {1,25};
  
    context->gop_size = 1;
  
    //context->max_b_frames = 1;
  
    context->pix_fmt = PIX_FMT_YUV420P;
  
  
  
    // Open the codec
  
    if (avcodec_open2(context, codec, 0) < 0) {
  
      NSLog(@"Unable to open codec");
  
      return;
  
    }
  
  
  
  
  
    // Create the frame
  
    frame = avcodec_alloc_frame();
  
    if (!frame) {
  
      NSLog(@"Unable to alloc frame");
  
      return;
  
    }
  
    frame->format = context->pix_fmt;
  
    frame->width = context->width;
  
    frame->height = context->height;
  
  
  
  
  
    avpicture_fill((AVPicture *) frame, rawPixelBase, context->pix_fmt, frame->width, frame->height);
  
  
  
    int got_output = 0;
  
    av_init_packet(&packet);
  
    avcodec_encode_video2(context, &packet, frame, &got_output)
  
  
  
    // Unlock the pixel data
  
    CVPixelBufferUnlockBaseAddress(pixelBuffer, 0);
  
    // Send the data over the network
  
    [self uploadData:[NSData dataWithBytes:packet.data length:packet.size] toRTMP:self.rtmp_OutVideoStream];
  
  }

  Note : It is known that this code has memory leaks because I am not freeing the memory that is dynamically allocated.

  UPDATE

  I updated my code to use @pogorskiy method. I only try to upload the frame if got output returns 1 and clear the buffer once I am done encoding video frames.

• rtpdec : Don’t pass non-const pointers to fmtp attribute parsing functions

  24 février 2015, par Martin Storsjö

  rtpdec : Don’t pass non-const pointers to fmtp attribute parsing functions
  This makes it clear that the individual parsing functions can’t
  
  touch the parsed out value.
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DH] libavformat/rtpdec.c
  • [DH] libavformat/rtpdec.h
  • [DH] libavformat/rtpdec_amr.c
  • [DH] libavformat/rtpdec_dv.c
  • [DH] libavformat/rtpdec_h264.c
  • [DH] libavformat/rtpdec_hevc.c
  • [DH] libavformat/rtpdec_ilbc.c
  • [DH] libavformat/rtpdec_latm.c
  • [DH] libavformat/rtpdec_mpeg4.c
  • [DH] libavformat/rtpdec_xiph.c

• Error decoding stream invalid data found

  10 avril 2018, par bluemoon odd

  I have a software that first extract a video to jpg photo
  than we can insert any text or image auto in all jpg files
  extracted before than i try to rebuild the video with that images but
  its seems my frames extracted after to insert the text on it and re save the each file again with string option so i will have the output 0 , 1, 2 , 3 , etc.
  But wen i try to rebuild the video its look like the photo are not well encoded, how can i solve this error
  And Here is the image of the ffmpeg error
  ffmpeg error
  this is the code i use to rebuild the video with ffmpeg

  Public Class Form3
  
  Dim frame As Long 'individual frames
  
  Dim tempdir As String = "C:\mediapubisert\" ' images temp directory
  
  
  
  Private Sub SaveFileDialog1_FileOk(sender As Object, e As System.ComponentModel.CancelEventArgs) Handles SaveFileDialog1.FileOk
  
      Dim args As String 'declare args
  
      args = "-r 1/.1 -i " & tempdir & "\%01d.jpg -c:v libx264 -r 30 -pix_fmt yuv420p " & Chr(34) & SaveFileDialog1.FileName & Chr(34) 'set ffmpeg arguments
  
      Dim proc As New Process
  
      Dim proci As New ProcessStartInfo
  
      proci.FileName = My.Application.Info.DirectoryPath & "\ffmpeg.exe"
  
      proci.Arguments = args
  
      proci.WindowStyle = ProcessWindowStyle.Hidden
  
      proci.CreateNoWindow = True
  
      proci.UseShellExecute = False
  
      proc.StartInfo = proci
  
      proc.Start()
  
      Do Until proc.HasExited = True
  
          Me.Text = "Saving"
  
      Loop
  
      Me.Text = "Media Pub Insert"
  
  
  
      MsgBox("Done")
  
  
  
      'IO.Directory.Delete(tempdir, True)
  
  End Sub
  
  
  
  Private Sub renameFilesInFolder()
  
      Dim sourcePath As String = "C:\mediapubisert\"
  
      Dim searchPattern As String = "*.jpg"
  
      Dim i As Integer = 0
  
      For Each fileName As String In Directory.GetFiles(sourcePath, searchPattern, SearchOption.AllDirectories)
  
          File.Move(Path.Combine(sourcePath, fileName), Path.Combine(sourcePath, "" & i & ".JPG"))
  
          i += 1
  
      Next
  
  End Sub
  
  
  
  Private Sub Form3_Load(sender As Object, e As EventArgs) Handles MyBase.Load
  
      If (Not System.IO.Directory.Exists(tempdir)) Then
  
          System.IO.Directory.CreateDirectory(tempdir)
  
      End If
  
      renameFilesInFolder()
  
  End Sub
  
  
  
  Private Sub Timer1_Tick(sender As Object, e As EventArgs) Handles Timer1.Tick
  
  
  
  End Sub
  
  
  
  Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
  
      SaveFileDialog1.ShowDialog()
  
  End Sub
  
  
  
  
  
  Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
  
      renameFilesInFolder()
  
  End Sub
  
  
  
  End Class