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• ffmpeg avcodec_open2 changed audio format in AVCodecContext

  16 mai 2016, par user1083577

  I have a mkv file with a DTS track.

  After avcodec_open2 is called, sample_fmt in AVCodexContext changed. Is it expected ?

  AVCodecContext* avAudioCodecCtx = avFormatCtx->streams[audioStreamIndex]->codec;
  
  
  
  AVSampleFormat f = avAudioCodecCtx->sample_fmt; // AV_SAMPLE_FMT_FLTP
  
  avcodec_open2(avAudioCodecCtx, avAudioCodec, NULL);
  
  AVSampleFormat f2 = avAudioCodecCtx->sample_fmt; // AV_SAMPLE_FMT_S32P

  ffprobe

  ffprobe version N-79143-g8ff0f6a Copyright (c) 2007-2016 the FFmpeg developers
  
    built with gcc 5.3.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmfx --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-decklink --enable-zlib
  
    libavutil      55. 19.100 / 55. 19.100
  
    libavcodec     57. 30.100 / 57. 30.100
  
    libavformat    57. 29.101 / 57. 29.101
  
    libavdevice    57.  0.101 / 57.  0.101
  
    libavfilter     6. 40.102 /  6. 40.102
  
    libswscale      4.  0.100 /  4.  0.100
  
    libswresample   2.  0.101 /  2.  0.101
  
    libpostproc    54.  0.100 / 54.  0.100
  
  
  
  Stream #0:1(eng): Audio: dts (DTS), 48000 Hz, 5.1(side), fltp, 768 kb/s (default)

  Decoding

  avcodec_decode_audio4(avAudioCodecCtx, frame, &frameComplete, avPacket);
  
  frame->format // contains AV_SAMPLE_FMT_FLTP

• concatenate MP4 videos with FFmpeg using concat demuxer in android

  10 mai 2016, par Ara Badalyan

  I want to concatenate MP4 videos with FFmpeg, the problem is when I want to merge videos taken with Iphone and Android it throws problem :

  Non-monotonous DTS in output stream 0:1 ; previous : 150528, current : 139268 ; changing to 150529. This may result in incorrect timestamps in the output file.

  This is my code

  merge.txt

  file 'iphone.mp4'
  
  file 'android.mp4'

  FFmpeg command

  ffmpeg -f concat -i marge.txt -c copy -y merge.mp4

  If I can’t merge this videos how can I make them with same parameters (frame rate, bitrate...) and merge them ?

  I use FFmpeg version 2.4.2, because I can’t find android FFmpeg library higher then 2.4.2.

  This is complete console output of : ffmpeg -i android.mp4 -i iphone.mp4

  ffmpeg version n2.4.2 Copyright (c) 2000-2014 the FFmpeg developers
  
         built on Oct  7 2014 15:08:46 with gcc 4.8 (GCC)
  
                 configuration: --target-os=linux --cross-prefix=/home/sb/Source-Code/ffmpeg-android/toolchain-android/bin/arm-linux-androideabi- --arch=arm --cpu=cortex-a8 --enable-runtime-cpudetect --sysroot=/home/sb/Source-Code/ffmpeg-android/toolchain-android/sysroot --enable-pic --enable-libx264 --enable-libass --enable-libfreetype --enable-libfribidi --enable-fontconfig --enable-pthreads --disable-debug --disable-ffserver --enable-version3 --enable-hardcoded-tables --disable-ffplay --disable-ffprobe --enable-gpl --enable-yasm --disable-doc --disable-shared --enable-static --pkg-config=/home/sb/Source-Code/ffmpeg-android/ffmpeg-pkg-config --prefix=/home/sb/Source-Code/ffmpeg-android/build/armeabi-v7a-neon --extra-cflags='-I/home/sb/Source-Code/ffmpeg-android/toolchain-android/include -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all -mfpu=neon' --extra-ldflags='-L/home/sb/Source-Code/ffmpeg-android/toolchain-android/lib -Wl,-z,relro -Wl,-z,now -pie' --extra-libs='-lpng -lexpat -lm' --extra-cxxflags=
  
                 libavutil      54.  7.100 / 54.  7.100
  
                 libavcodec     56.  1.100 / 56.  1.100
  
                 libavformat    56.  4.101 / 56.  4.101
  
                 libavdevice    56.  0.100 / 56.  0.100
  
                 libavfilter     5.  1.100 /  5.  1.100
  
                 libswscale      3.  0.100 /  3.  0.100
  
                 libswresample   1.  1.100 /  1.  1.100
  
                 libpostproc    53.  0.100 / 53.  0.100
  
               Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'android.mp4':
  
                 Metadata:
  
                   major_brand     : isom
  
           minor_version   : 512
  
                   compatible_brands: isomiso2avc1mp41
  
           encoder         : Lavf57.21.101
  
                 Duration: 00:00:01.29, start: 0.023220, bitrate: 308 kb/s
  
           Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 720x1280 [SAR 1:1 DAR 9:16], 113 kb/s, 24 fps, 24 tbr, 12288 tbn, 48 tbc (default)
  
           Metadata:
  
                     handler_name    : VideoHandler
  
           Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 186 kb/s (default)
  
           Metadata:
  
                     handler_name    : SoundHandler
  
       Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'iphone.mp4':
  
                 Metadata:
  
                   major_brand     : mp42
  
           minor_version   : 1
  
                   compatible_brands: mp41mp42isom
  
           creation_time   : 2016-05-10 09:46:30
  
                 Duration: 00:00:02.63, start: 0.000000, bitrate: 4768 kb/s
  
           Stream #1:0(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 101 kb/s (default)
  
           Metadata:
  
                     creation_time   : 2016-05-10 09:46:30
  
                     handler_name    : Core Media Audio
  
           Stream #1:1(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 720x1280, 4657 kb/s, 30 fps, 30 tbr, 600 tbn, 1200 tbc (default)
  
           Metadata:
  
                     creation_time   : 2016-05-10 09:46:30
  
                     handler_name    : Core Media Video
  
       At least one output file must be specified

• ffmpeg : avcodec_open2 returns invalid argument

  12 mai 2016, par roari

  i’m reusing the sample code from the developer 64bit release of ffmpeg in my application to encode a video :

  AVCodec* pCodec_{nullptr};
  
  AVCodecContext* pContext_{nullptr};
  
  
  
  avcodec_register_all();
  
  pCodec_ = avcodec_find_encoder(AV_CODEC_ID_MPEG2VIDEO);
  
  if (!pCodec_) {}
  
  
  
  pContext_ = avcodec_alloc_context3(pCodec_);
  
  if (!pContext_) {}
  
  
  
  pContext_->bit_rate = 400000;
  
  pContext_->width = size.width();
  
  pContext_->height = size.height();
  
  
  
  pContext_->time_base.den = 1;
  
  pContext_->time_base.num = fps;
  
  
  
  pContext_->gop_size = 10;
  
  pContext_->max_b_frames = 1;
  
  pContext_->pix_fmt = AV_PIX_FMT_BGR0;
  
  
  
  if (codec_id == AV_CODEC_ID_H264) {
  
      av_opt_set(pContext_->priv_data, "preset", "slow", 0);
  
  }
  
  
  
  int err = avcodec_open2(pContext_, pCodec_, nullptr);
  
  if (err < 0) {}

  AVCodec* and AVCodecContext* look like they are allocated correctly. avcodec_open2 then returns invalid argument (-22).

  I use : Windows 10 64, VS2013 Compiler, Qt Creator IDE, ffmpeg(2016-05-12) 64bit.

  The sample i took the code from is "decoding_encoding.c".

  Any ideas ?