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• Android FFMPEG Build with librtmp

  20 décembre 2013, par Dan Turner

  I have been pulling my hair out trying to compile FFMPEG for Android with librtmp enabled. I have successfully built FFMPEG using the Guardian Project here, but it doesn't have librtmp support. The only answer I have found to this issue is on a previous Stack Overflow question (HERE), but it doesn't want to work for me.

  At the moment, I have the cross-compiled librtmp.so.0 file from the official rtmpdump android build in an rtmpdump/librtmp folder sitting in the android-ffmpeg folder. An extract from my configure_ffmpeg.sh file reads as follows :

  ./configure \
  
  $DEBUG_FLAG \
  
  --arch=arm \
  
  --cpu=cortex-a8 \
  
  --target-os=linux \
  
  --enable-runtime-cpudetect \
  
  --prefix=$prefix \
  
  --enable-pic \
  
  --disable-shared \
  
  --enable-static \
  
  --cross-prefix=$NDK_TOOLCHAIN_BASE/bin/$NDK_ABI-linux-androideabi- \
  
  --sysroot="$NDK_SYSROOT" \
  
  --extra-cflags="-I../x264 -mfloat-abi=softfp -mfpu=neon" \
  
  --extra-ldflags="-L../x264" \
  
  --extra-cflags="-I/home/dan/android-ffmpeg/rtmpdump" \
  
  --extra-ldflags="-L/home/dan/android-ffmpeg/rtmpdump -lrtmp"
  
  \
  
  
  
  --enable-version3 \
  
  --enable-gpl \
  
  \
  
  --disable-doc \
  
  --enable-yasm \
  
  \
  
  --enable-decoders \
  
  --enable-encoders \
  
  --enable-muxers \
  
  --enable-demuxers \
  
  --enable-parsers \
  
  --enable-protocols \
  
  --enable-filters \
  
  --enable-avresample \
  
  --enable-libfreetype \
  
  \
  
  --disable-indevs \
  
  --enable-indev=lavfi \
  
  --disable-outdevs \
  
  \
  
  --enable-hwaccels \
  
  \
  
  --enable-ffmpeg \
  
  --disable-ffplay \
  
  --disable-ffprobe \
  
  --enable-ffserver \
  
  --enable-network \
  
  \
  
  --enable-libx264 \
  
  --enable-zlib \
  
  --enable-librtmp \

  When I try to compile this, it eventually displays an error and my FFMPEG config.log file tells me that it can't find -lrtmp. I'm positive I'm directing it to the right directory... does anyone have any ideas ?

  Regards

  Dan

• yet another screenshot encoding exercise with ffmpeg - stuck at getting AVFrame from ALT::CImage - VC++

  11 septembre 2013, par sith

  Total AV newbee here - trying to learn the ropes on using FFMpeg functions to encode movies. On searching for tutorials I found a few similar questions that I have linked here for reference :

  Encoding a screenshot into a video using FFMPEG

  [Libav-user] Encoding a screenshot into a video using FFMPEG

  Save bitmap to video (libavcodec ffmpeg)

  When converting from RGB to YUV using ffmpeg the video file the color is spread why ?

  How to convert RGB from YUV420p for ffmpeg encoder ?

  Encode bmp sequence with libavcodec...Help !

  Not able to encode image with ffmpeg

  For my setup FFMPEG is on VS12 - VC++ with MFC on win7.

  With the help of above samples, I am able to get "some" output from the encoder, but I am not sure in what format or state the output has been encoded. Neither VLC nor WMP can play this file. It does not even seem to recognize the metadata in the file to display the FPS or video length. What would normally cause that ? Also any pointers on what could be going wrong and how to approach fixing the problems would be great. [1]

  Here is the flow of my code :

  Step1 : capture desktop on to a CImg :

  int W=GetSystemMetrics(SM_CXSCREEN), H=GetSystemMetrics(SM_CYSCREEN), bpp=24; 
  
  CImage cImg; cImg.Create(W,H,bpp) 
  
  HDC hDC = cImg.GetDC(); 
  
  CWindowDC winDC(GetDesktopWindow()); 
  
  
  
  BitBlt(hDC, 0,0, rez.W(), rez.H(), winDC.m_hDC, 0, 0, SRCCOPY);

  At this point I am able to dump a screen shot into a bmp file -
  using cImg.Save( _T("test.bmp"), Gdiplus::ImageFormatBMP) ;

  Step2 : Extract the BMP bits from the CImg.

  HBITMAP hBitmap = (HBITMAP)cImg;
  
  HDC memDC = CreateCompatibleDC(NULL);
  
  SelectObject( memDC, hBitmap );
  
  
  
  BITMAPINFO bmi; // initialized bmi with {W,-H, plane=1, bitCount=24, comp=BI_RGB, size=W*H*3 }
  
  << removed bmi init code for conciseness. >>>
  
  
  
  BYTE *rgb24Data = new BYTE[W*H*3]; // 3 for 24bpp. 4 for 32...
  
  int ret = GetDIBits(memDC, hBitmap, 0, H, rgb24Data, &bmi, DIB_RGB_COLORS);

  At this point I faithfully believe rgb24Data points to pixel data :) - copied out of the cImg bitmap

  Step 3 : next I try to create an AV frame with the rgb24Data got from this CImg. Also this is where I have a massive knowledge gap. I am going to try and recover

  // setup the codecs and contexts here as per mohM's post
  
  
  
  AVCodec *currCodec = avcodec_find_encoder(CODEC_ID_MPEG4);
  
  
  
  AVCodecContext *codeCtxt = avcodec_alloc_context();  // init this with bate=400k, W, H,
  
  << removed codeCtxt init code for conciseness. >>>   //  time base 1/25, gop=10, max_b=1, fmt=YUV420
  
  
  
  avcodec_open(codeCtxt, currCodec);
  
  
  
  SwsContext *currSWSCtxt = sws_getContext( W, H, AV_PIX_FMT_RGB24, // FROM
  
                                            W, H, AV_PIX_FMT_YUV420P, // TO
  
                                            SWS_FAST_BILINEAR,
  
                                            NULL, NULL, NULL);
  
  
  
  // allocate and fill AVFrame
  
  int numBytes = avpicture_get_size(PIX_FMT_YUV420P, W, H);
  
  uint8_t *buffer=new uint8_t[numBytes];
  
  AVFrame *avFrame = avcodec_alloc_frame();
  
  avpicture_fill( (AVPicture*)avFrame, buffer, PIX_FMT_YUV420P, W, H );

  Step 4 : transform the data frame into YUV420P as we fill the frame.

  uint8_t * inData[1] = { rgb24Data };
  
  int inLinesize[1] = { 3*W }; // RGB stride
  
  sws_scale( currSWSCtxt, inData, inLinesize, 0, H,
  
             avFrame->data, avFrame->linesize);

  step 5 encode the frame and write out the output buffer into a file.

  int out_size = avcodec_encode_video( codeCtxt,
  
                                       outBuf,
  
                                       outBufSize,
  
                                       avFrame );
  
  
  
  fwrite(outBuf, 1, outBufSize, outFile );

  finally I close the file off with [0x00 0x00 0x01 0xb7]

  The first hint of things gone haywire is that for a 50 screens of 1920X1080 at 24bpp encoded at 25fps gives me a 507MB unplayable-mpeg file.

  As mentioned earlier, neither VLC nor WMP can play this file nor they even recognize the metadata in the file to display the FPS or video length. What would normally cause that ? Also any pointers on what could be going wrong and how to approach fixing the problems would be great. [2]

  Any guidance is much appreciated.

• Copied .ass Subtitle Has Font Size Changed

  7 novembre 2022, par Rapta

  This is happening when doing an mkv to mkv conversion, with a simple -c:s copy, and whilst the font style, and position are the same, the size ends up being bigger. I'm also playing it with VLC ,if that matters.

  


  Here're the sub settings :
[Script Info]
 ; Script generated by Aegisub r8942
 ; http://www.aegisub.org/
Title : Default Aegisub file
ScriptType : v4.00+
PlayDepth : 0
YCbCr Matrix : TV.601
PlayResX : 708
PlayResY : 480
WrapStyle : 0
ScaledBorderAndShadow : yes

  


  [Aegisub Project Garbage]
Last Style Storage : Default
Video AR Mode : 4
Video AR Value : 1.333333
Video Zoom Percent : 1.000000
Video Position : 35410

  


  [V4+ Styles]
Format : Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, OutlineColour, BackColour, Bold, Italic, Underline, StrikeOut, ScaleX, ScaleY, Spacing, Angle, BorderStyle, Outline, Shadow, Alignment, MarginL, MarginR, MarginV, Encoding
Style : Default,Funimitation,28,&H00FFFFFF,&H0300FFFF,&H00000000,&H02000000,-1,0,0,0,100,100,1,0,1,2,0,2,40,40,25,1
Style : Lyrics JPN,Faxfont Tone,40,&H00FFFFFF,&H000000FF,&H00000000,&H501D0032,0,0,0,0,100,100,0,0,1,0,0,8,0,0,10,0
Style : Lyrics ENG,Faxfont Tone,36,&H00FFFFFF,&H000000FF,&H00000000,&H501D0032,0,0,0,0,100,100,0,0,1,0,0,2,0,0,6,0
Style : Title,Faxfont Tone,55,&H00FFFFFF,&H000000FF,&H28616161,&H28E0E0E0,-1,0,0,0,100,100,0,0,1,0.5,0.1,2,10,10,20,1
Style : Credits ENG,Faxfont Tone,42,&H00FFFFFF,&H000000FF,&H00000000,&H501D0032,0,0,0,0,100,100,0,0,1,0,0,8,0,0,0,0

  


  And here's a sub example :
[Events]
Format : Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
Dialogue : 0,0:00:17.95,0:00:20.79,Credits ENG,,0,0,0,,\blur0.6\c&HFFF3ED&\fscx60\fscy76\pos(102.882,73)Planning

  


  If I export the sub from the converted file, all of the settings are the same.

  


  Is there any way to stop the size from changing ?

  


  Thanks

  


  Tried : -c:s copy
Expected : Complete copy.
Resulted : Not a complete copy — the font size was bigger.