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• iPhone - A problem with decoding H264 using ffmpeg

  25 mars 2012, par HAPPY_TIGER

  I am working with ffmpeg to decode H264 stream from server.

  I referenced DecoderWrapper from http://github.com/dropcam/dropcam_for_iphone.

  I compiled it successfully, but I don't know how use it.

  Here are the function that has problem.

  - (id)initWithCodec:(enum VideoCodecType)codecType 
  
           colorSpace:(enum VideoColorSpace)colorSpace 
  
                width:(int)width 
  
               height:(int)height 
  
          privateData:(NSData*)privateData {
  
      if(self = [super init]) {
  
  
  
          codec = avcodec_find_decoder(CODEC_ID_H264);
  
          codecCtx = avcodec_alloc_context();
  
  
  
          // Note: for H.264 RTSP streams, the width and height are usually not specified (width and height are 0).  
  
          // These fields will become filled in once the first frame is decoded and the SPS is processed.
  
          codecCtx->width = width;
  
          codecCtx->height = height;
  
  
  
          codecCtx->extradata = av_malloc([privateData length]);
  
          codecCtx->extradata_size = [privateData length];
  
          [privateData getBytes:codecCtx->extradata length:codecCtx->extradata_size];
  
          codecCtx->pix_fmt = PIX_FMT_YUV420P;
  
  #ifdef SHOW_DEBUG_MV
  
          codecCtx->debug_mv = 0xFF;
  
  #endif
  
  
  
          srcFrame = avcodec_alloc_frame();
  
          dstFrame = avcodec_alloc_frame();
  
  
  
          int res = avcodec_open(codecCtx, codec);
  
          if (res < 0)
  
          {
  
              NSLog(@"Failed to initialize decoder");
  
          }
  
      }
  
  
  
      return self;    
  
  }

  What is the privateData parameter of this function ? I don't know how to set the parameter...

  Now avcodec_decode_video2 returns -1 ;

  The framedata is coming successfully.

  How solve this problem.

  Thanks a lot.

• Minimal configure flags to configure png files to mp4 and gif ?

  24 avril 2012, par Jona

  I'm trying to configure and build ffmpeg only with the most minimum libraries needed to read set of images of png type and convert those images into a movie. The movie output support I need are gif and mp4.

  I was able to get mp4 output but gif output I can't get it to work just crashes or exist without errors.

  Could not find input stream matching output stream #1.0

  There might be some extra configure flags that can be removed too...

  Here is my configure :

  ./configure \
  
  --target-os=linux \
  
  --prefix=$PREFIX \
  
  --enable-cross-compile \
  
  --extra-libs="-lgcc" \
  
  --arch=arm \
  
  --enable-gpl \
  
  --enable-version3 \
  
  --enable-nonfree \
  
  --sysroot=$NDK_SYSROOT \
  
  --extra-cflags="-I../x264 -Ivideokit -O3 -fpic -DANDROID -DHAVE_SYS_UIO_H=1 -Dipv6mr_interface=ipv6mr_ifindex -fasm -Wno-psabi -fno-short-enums  -fno-strict-aliasing -finline-limit=300 $OPTIMIZE_CFLAGS " \
  
  --extra-ldflags="-L../x264 -Wl,-rpath-link=/usr/lib -L/usr/lib  -nostdlib -lc -lm -ldl -llog" \
  
  --disable-shared \
  
  --enable-static \
  
  --enable-stripping \
  
  --enable-asm \
  
  \
  
  --disable-ffplay \
  
  --disable-ffprobe \
  
  --disable-ffserver \
  
  --disable-doc \
  
  --disable-network \
  
  \
  
  --disable-protocols \
  
  --disable-demuxers \
  
  --disable-decoders \
  
  --disable-encoders \
  
  --disable-muxers \
  
  --enable-libx264 \
  
  --enable-protocol=file \
  
  --enable-demuxer=image2 \
  
  --enable-demuxer=image2pipe \
  
  --enable-demuxer=mjpeg \
  
  --enable-demuxer=rawvideo \
  
  --enable-demuxer=yuv4mpegpipe \
  
  --enable-decoder=png \
  
  --enable-encoder=libx264 \
  
  --enable-encoder=png \
  
  --enable-encoder=mjpeg \
  
  --enable-encoder=gif \
  
  --enable-encoder=mpeg4 \
  
  --enable-encoder=mpeg2video \
  
  --enable-muxer=image2 \
  
  --enable-muxer=image2pipe \
  
  --enable-muxer=mjpeg \
  
  --enable-muxer=mp4 \
  
  --enable-muxer=mpeg2video \
  
  --enable-muxer=rawvideo \
  
  --enable-muxer=yuv4mpegpipe \
  
  --enable-muxer=gif \

• ffmpeg -vcopy to folder without filename

  9 novembre 2017, par Musikdoktor

  I’m trying to find a command line to copy part of videos and export them to a different folder.

  The problem i need to solve is each file may have different extensions, .mxf, .dv, .avi etc some came from a internal url server that gives download links like /server/download ?id=1000 and that will download an mp4, or a mxf so i have no idea the extension.. the name is not important..

  i want to know if it’s possible or there’s an existing command line where the -y file.extension is not needed.

  For example

  ffmpeg.exe -i "/server/download ?id=1000" -vcodec copy -acodec copy -y "folder/"

  An i get a filename.avi or filename.mxf inside that "folder/"