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• Why ffmpeg command results in blank video ?

  17 juillet 2013, par kheya

  I am trying to conver mov file to H264 encoded mp4
  Same command converts another mov file just fine.

  But fails for a particular mov file. Original video is 29.6MB after conversion I get 966KB

  I get the sound and duration right. But all the frames are black even though original video is fine.

  Here is the command :

  ffmpeg -i file3.mov -movflags +faststart -vcodec libx264 -preset slow -crf 20 -vf -threads 0 -acodec libvo_aacenc -b:a 128k "file3.mp4"

  Here is the result of ffmpeg -i : >ffmpeg.exe -i file3.mov

  ffmpeg version N-54691-g7f4a1fd Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Jul 12 2013 16:31:48 with gcc 4.7.3 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
  
  isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
  
  le-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetyp
  
  e --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --ena
  
  ble-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-l
  
  ibopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libsp
  
  eex --enable-libtheora --enable-libtwolame --enable-libvo-aacenc --enable-libvo-
  
  amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --
  
  enable-libxvid --enable-zlib
  
    libavutil      52. 39.100 / 52. 39.100
  
    libavcodec     55. 18.102 / 55. 18.102
  
    libavformat    55. 12.102 / 55. 12.102
  
    libavdevice    55.  3.100 / 55.  3.100
  
    libavfilter     3. 80.101 /  3. 80.101
  
    libswscale      2.  3.100 /  2.  3.100
  
    libswresample   0. 17.102 /  0. 17.102
  
    libpostproc    52.  3.100 / 52.  3.100
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 00000000003077e0] sample aspect ratio already set to
  
  118:81, ignoring 'pasp' atom (10000:7031)
  
  Guessed Channel Layout for  Input Stream #0.1 : stereo
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'file3.mov':
  
    Metadata:
  
      creation_time   : 2009-02-12 01:19:22
  
    Duration: 00:00:08.00, start: 0.000000, bitrate: 30338 kb/s
  
      Stream #0:0(eng): Video: dvvideo (dvpp / 0x70707664), yuv411p, 720x576 [SAR
  
  64:45 DAR 16:9], 28800 kb/s, SAR 118:81 DAR 295:162, 25 fps, 25 tbr, 600 tbn, 25
  
   tbc
  
      Metadata:
  
        creation_time   : 2009-02-12 01:19:22
  
        handler_name    : Apple Alias Data Handler
  
      Stream #0:1(eng): Audio: pcm_s16be (twos / 0x736F7774), 48000 Hz, stereo, s1
  
  6, 1536 kb/s
  
      Metadata:
  
        creation_time   : 2009-02-12 01:19:22
  
        handler_name    : Apple Alias Data Handler

  During conversion here is what I see (nothing unusual or no errors) :

  ffmpeg version N-54691-g7f4a1fd Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Jul 12 2013 16:31:48 with gcc 4.7.3 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
  
  isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
  
  le-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetyp
  
  e --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --ena
  
  ble-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-l
  
  ibopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libsp
  
  eex --enable-libtheora --enable-libtwolame --enable-libvo-aacenc --enable-libvo-
  
  amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --
  
  enable-libxvid --enable-zlib
  
    libavutil      52. 39.100 / 52. 39.100
  
    libavcodec     55. 18.102 / 55. 18.102
  
    libavformat    55. 12.102 / 55. 12.102
  
    libavdevice    55.  3.100 / 55.  3.100
  
    libavfilter     3. 80.101 /  3. 80.101
  
    libswscale      2.  3.100 /  2.  3.100
  
    libswresample   0. 17.102 /  0. 17.102
  
    libpostproc    52.  3.100 / 52.  3.100
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 00000000024aafe0] sample aspect ratio already set to
  
  118:81, ignoring 'pasp' atom (10000:7031)
  
  Guessed Channel Layout for  Input Stream #0.1 : stereo
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'file3.mov':
  
    Metadata:
  
      creation_time   : 2009-02-12 01:19:22
  
    Duration: 00:00:08.00, start: 0.000000, bitrate: 30338 kb/s
  
      Stream #0:0(eng): Video: dvvideo (dvpp / 0x70707664), yuv411p, 720x576 [SAR
  
  64:45 DAR 16:9], 28800 kb/s, SAR 118:81 DAR 295:162, 25 fps, 25 tbr, 600 tbn, 25
  
   tbc
  
      Metadata:
  
        creation_time   : 2009-02-12 01:19:22
  
        handler_name    : Apple Alias Data Handler
  
      Stream #0:1(eng): Audio: pcm_s16be (twos / 0x736F7774), 48000 Hz, stereo, s1
  
  6, 1536 kb/s
  
      Metadata:
  
        creation_time   : 2009-02-12 01:19:22
  
        handler_name    : Apple Alias Data Handler
  
  No pixel format specified, yuv422p for H.264 encoding chosen.
  
  Use -pix_fmt yuv420p for compatibility with outdated media players.
  
  [libx264 @ 0000000000347340] using SAR=118/81
  
  [libx264 @ 0000000000347340] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
  
  AVX
  
  [libx264 @ 0000000000347340] profile High 4:2:2, level 2.1, 4:2:2 8-bit
  
  [libx264 @ 0000000000347340] 264 - core 133 r2334 a3ac64b - H.264/MPEG-4 AVC cod
  
  ec - Copyleft 2003-2013 - http://www.videolan.org/x264.html - options: cabac=1 r
  
  ef=5 deblock=1:0:0 analyse=0x3:0x113 me=umh subme=8 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_pski
  
  p=1 chroma_qp_offset=-2 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 deci
  
  mate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_
  
  adapt=2 b_bias=0 direct=3 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=2
  
  5 scenecut=40 intra_refresh=0 rc_lookahead=50 rc=crf mbtree=1 crf=20.0 qcomp=0.6
  
  0 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  Output #0, mp4, to 'file4a.mp4':
  
    Metadata:
  
      encoder         : Lavf55.12.102
  
      Stream #0:0(eng): Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv422p, 4
  
  80x320 [SAR 118:81 DAR 59:27], q=-1--1, 12800 tbn, 25 tbc
  
      Metadata:
  
        creation_time   : 2009-02-12 01:19:22
  
        handler_name    : Apple Alias Data Handler
  
      Stream #0:1(eng): Audio: aac (libvo_aacenc) ([64][0][0][0] / 0x0040), 48000
  
  Hz, stereo, s16, 128 kb/s
  
      Metadata:
  
        creation_time   : 2009-02-12 01:19:22
  
        handler_name    : Apple Alias Data Handler
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (dvvideo -> libx264)
  
    Stream #0:1 -> #0:1 (pcm_s16be -> libvo_aacenc)
  
  Press [q] to stop, [?] for help
  
  [swscaler @ 00000000024b0740] Warning: data is not aligned! This can lead to a s
  
  peedloss
  
  frame=   78 fps=0.0 q=25.0 size=     128kB time=00:00:02.14 bitrate= 487.8kbits/
  
  frame=  113 fps=109 q=25.0 size=     272kB time=00:00:04.27 bitrate= 520.9kbits/
  
  frame=  145 fps= 94 q=25.0 size=     399kB time=00:00:05.36 bitrate= 609.2kbits/
  
  frame=  182 fps= 89 q=25.0 size=     571kB time=00:00:06.45 bitrate= 725.0kbits/
  
  Starting second pass: moving header on top of the file
  
  frame=  200 fps= 70 q=-1.0 Lsize=     965kB time=00:00:08.00 bitrate= 987.2kbits
  
  /s
  
  video:832kB audio:126kB subtitle:0 global headers:0kB muxing overhead 0.755121%
  
  [libx264 @ 0000000000347340] frame I:1     Avg QP:21.14  size: 39885
  
  [libx264 @ 0000000000347340] frame P:50    Avg QP:21.80  size:  7412
  
  [libx264 @ 0000000000347340] frame B:149   Avg QP:26.25  size:  2960
  
  [libx264 @ 0000000000347340] consecutive B-frames:  0.5%  0.0%  1.5% 98.0%
  
  [libx264 @ 0000000000347340] mb I  I16..4: 13.7% 46.7% 39.7%
  
  [libx264 @ 0000000000347340] mb P  I16..4:  0.5% 19.7%  3.8%  P16..4: 32.8% 11.9
  
  % 14.1%  0.0%  0.0%    skip:17.1%
  
  [libx264 @ 0000000000347340] mb B  I16..4:  0.0%  5.1%  1.3%  B16..8: 14.4%  9.2
  
  %  2.9%  direct: 7.3%  skip:59.8%  L0:42.8% L1:38.3% BI:19.0%
  
  [libx264 @ 0000000000347340] 8x8 transform intra:79.4% inter:71.7%
  
  [libx264 @ 0000000000347340] direct mvs  spatial:97.3% temporal:2.7%
  
  [libx264 @ 0000000000347340] coded y,uvDC,uvAC intra: 92.8% 80.1% 26.3% inter: 2
  
  4.2% 28.8% 8.1%
  
  [libx264 @ 0000000000347340] i16 v,h,dc,p: 64% 17%  3% 16%
  
  [libx264 @ 0000000000347340] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu:  1% 33%  4%  3%  8%
  
   2% 35%  2% 11%
  
  [libx264 @ 0000000000347340] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu:  3% 23%  5%  4% 11%
  
   5% 33%  4% 13%
  
  [libx264 @ 0000000000347340] i8c dc,h,v,p: 38% 40% 14%  8%
  
  [libx264 @ 0000000000347340] Weighted P-Frames: Y:2.0% UV:0.0%
  
  [libx264 @ 0000000000347340] ref P L0: 39.9% 10.0% 25.6%  8.7% 15.3%  0.6%
  
  [libx264 @ 0000000000347340] ref B L0: 76.9% 15.1%  5.7%  2.3%
  
  [libx264 @ 0000000000347340] ref B L1: 96.3%  3.7%
  
  [libx264 @ 0000000000347340] kb/s:851.49

• How to concat mp4 files using libffmpeg in c program ?

  1er août 2013, par chichien

  I know ffmpeg command line is easy, but how to programmatically implement？ I'm not good at this，here is some code from internet, it is used to convert .mp4 to .ts，and i made some changes，but the audio stream problem persists：

  #include 
  
  #include 
  
  #include 
  
  #include 
  
  
  
  #include "libavformat/avformat.h"
  
  #include "libavcodec/avcodec.h"
  
  #include "libavutil/avutil.h"
  
  #include "libavutil/rational.h"
  
  #include "libavdevice/avdevice.h"
  
  #include "libavutil/mathematics.h"
  
  #include "libswscale/swscale.h"
  
  
  
  static AVStream* add_output_stream(AVFormatContext* output_format_context, AVStream* input_stream)
  
  {
  
  
  
      AVCodecContext* input_codec_context = NULL;
  
      AVCodecContext* output_codec_context = NULL;
  
  
  
      AVStream* output_stream = NULL;
  
      output_stream = av_new_stream(output_format_context, 0);
  
      if (!output_stream)
  
      {
  
          printf("Call av_new_stream function failed\n");
  
          return NULL;
  
      }
  
  
  
      input_codec_context = input_stream->codec;
  
      output_codec_context = output_stream->codec;
  
  
  
      output_codec_context->codec_id = input_codec_context->codec_id;
  
      output_codec_context->codec_type = input_codec_context->codec_type;
  
      output_codec_context->codec_tag = input_codec_context->codec_tag;
  
      output_codec_context->bit_rate = input_codec_context->bit_rate;
  
      output_codec_context->extradata = input_codec_context->extradata;
  
      output_codec_context->extradata_size = input_codec_context->extradata_size;
  
  
  
      if (av_q2d(input_codec_context->time_base) * input_codec_context->ticks_per_frame > av_q2d(input_stream->time_base) && av_q2d(input_stream->time_base) < 1.0 / 1000)
  
      {
  
          output_codec_context->time_base = input_codec_context->time_base;
  
          output_codec_context->time_base.num *= input_codec_context->ticks_per_frame;
  
      }
  
      else
  
      {
  
          output_codec_context->time_base = input_stream->time_base;
  
      }
  
      switch (input_codec_context->codec_type)
  
      {
  
      case AVMEDIA_TYPE_AUDIO:
  
          output_codec_context->channel_layout = input_codec_context->channel_layout;
  
          output_codec_context->sample_rate = input_codec_context->sample_rate;
  
          output_codec_context->channels = input_codec_context->channels;
  
          output_codec_context->frame_size = input_codec_context->frame_size;
  
          if ((input_codec_context->block_align == 1 && input_codec_context->codec_id == CODEC_ID_MP3) || input_codec_context->codec_id == CODEC_ID_AC3)
  
          {
  
              output_codec_context->block_align = 0;
  
          }
  
          else
  
          {
  
              output_codec_context->block_align = input_codec_context->block_align;
  
          }
  
          break;
  
      case AVMEDIA_TYPE_VIDEO:
  
          output_codec_context->pix_fmt = input_codec_context->pix_fmt;
  
          output_codec_context->width = input_codec_context->width;
  
          output_codec_context->height = input_codec_context->height;
  
          output_codec_context->has_b_frames = input_codec_context->has_b_frames;
  
          if (output_format_context->oformat->flags & AVFMT_GLOBALHEADER)
  
          {
  
              output_codec_context->flags |= CODEC_FLAG_GLOBAL_HEADER;
  
          }
  
          break;
  
      default:
  
          break;
  
      }
  
  
  
      return output_stream;
  
  }
  
  
  
  //[[** from ffmpeg.c
  
  static void write_frame(AVFormatContext *s, AVPacket *pkt, AVCodecContext *avctx, AVBitStreamFilterContext *bsfc){
  
      int ret;
  
  
  
      while(bsfc){
  
          AVPacket new_pkt= *pkt;
  
          int a= av_bitstream_filter_filter(bsfc, avctx, NULL,
  
                                            &new_pkt.data, &new_pkt.size,
  
                                            pkt->data, pkt->size,
  
                                            pkt->flags & AV_PKT_FLAG_KEY);
  
          if(a>0){
  
              av_free_packet(pkt);
  
              new_pkt.destruct= av_destruct_packet;
  
          } else if(a<0){
  
              fprintf(stderr, "%s failed for stream %d, codec %s\n",
  
                      bsfc->filter->name, pkt->stream_index,
  
                      avctx->codec ? avctx->codec->name : "copy");
  
              //print_error("", a);
  
              //if (exit_on_error)
  
              //    ffmpeg_exit(1);
  
          }
  
          *pkt= new_pkt;
  
  
  
          bsfc= bsfc->next;
  
      }
  
  
  
      ret= av_interleaved_write_frame(s, pkt);
  
      if(ret < 0){
  
          //print_error("av_interleaved_write_frame()", ret);
  
          fprintf(stderr, "av_interleaved_write_frame(%d)\n", ret);
  
          exit(1);
  
      }
  
  }
  
  //]]**
  
  
  
  int main(int argc, char* argv[])
  
  {
  
  
  
      const char* input;
  
      const char* output;
  
      const char* output_prefix = NULL;
  
      char* segment_duration_check = 0;
  
      const char* index = NULL;
  
      char* tmp_index = NULL;
  
      const char* http_prefix = NULL;
  
      long max_tsfiles = NULL;
  
      double prev_segment_time = 0;
  
      double segment_duration = 0;
  
  
  
      AVInputFormat* ifmt = NULL;
  
      AVOutputFormat* ofmt = NULL;
  
      AVFormatContext* ic = NULL;
  
      AVFormatContext* oc = NULL;
  
      AVStream* video_st = NULL;
  
      AVStream* audio_st = NULL;
  
      AVCodec* codec = NULL;
  
      AVDictionary* pAVDictionary = NULL;
  
  
  
      long frame_count = 0;
  
  
  
      if (argc != 3) {
  
          fprintf(stderr, "Usage: %s inputfile outputfile\n", argv[0]);
  
          exit(1);
  
      }
  
  
  
      input = argv[1];
  
      output = argv[2];
  
  
  
      av_register_all();
  
  
  
      char szError[256] = {0};
  
      int nRet = avformat_open_input(&ic, input, ifmt, &pAVDictionary);
  
      if (nRet != 0)
  
      {
  
          av_strerror(nRet, szError, 256);
  
          printf(szError);
  
          printf("\n");
  
          printf("Call avformat_open_input function failed!\n");
  
          return 0;
  
      }
  
  
  
      if (av_find_stream_info(ic) < 0)
  
      {
  
          printf("Call av_find_stream_info function failed!\n");
  
          return 0;
  
      }
  
  
  
      ofmt = av_guess_format("mpegts", NULL, NULL);
  
      if (!ofmt)
  
      {
  
          printf("Call av_guess_format function failed!\n");
  
          return 0;
  
      }
  
  
  
      oc = avformat_alloc_context();
  
      if (!oc)
  
      {
  
          printf("Call av_guess_format function failed!\n");
  
          return 0;
  
      }
  
      oc->oformat = ofmt;
  
  
  
      int video_index = -1, audio_index = -1;
  
      for (unsigned int i = 0; i < ic->nb_streams && (video_index < 0 || audio_index < 0); i++)
  
      {
  
          switch (ic->streams[i]->codec->codec_type)
  
          {
  
          case AVMEDIA_TYPE_VIDEO:
  
              video_index = i;
  
              ic->streams[i]->discard = AVDISCARD_NONE;
  
              video_st = add_output_stream(oc, ic->streams[i]);
  
              break;
  
          case AVMEDIA_TYPE_AUDIO:
  
              audio_index = i;
  
              ic->streams[i]->discard = AVDISCARD_NONE;
  
              audio_st = add_output_stream(oc, ic->streams[i]);
  
              break;
  
          default:
  
              ic->streams[i]->discard = AVDISCARD_ALL;
  
              break;
  
          }
  
      }
  
      codec = avcodec_find_decoder(video_st->codec->codec_id);
  
      if (codec == NULL)
  
      {
  
          printf("Call avcodec_find_decoder function failed!\n");
  
          return 0;
  
      }
  
  
  
      if (avcodec_open(video_st->codec, codec) < 0)
  
      {
  
          printf("Call avcodec_open function failed !\n");
  
          return 0;
  
      }
  
  
  
      if (avio_open(&oc->pb, output, AVIO_FLAG_WRITE) < 0)
  
      {
  
          return 0;
  
      }
  
  
  
      if (avformat_write_header(oc, &pAVDictionary))
  
      {
  
          printf("Call avformat_write_header function failed.\n");
  
          return 0;
  
      }
  
  
  
      //[[++
  
      AVBitStreamFilterContext *bsfc = av_bitstream_filter_init("h264_mp4toannexb");
  
      //AVBitStreamFilterContext *absfc = av_bitstream_filter_init("aac_adtstoasc");
  
      if (!bsfc) {
  
          fprintf(stderr, "bsf init error!\n");
  
          return -1;
  
      }
  
      //]]++
  
  
  
      int decode_done = 0;
  
      do
  
      {
  
          double segment_time = 0;
  
          AVPacket packet;
  
  
  
          decode_done = av_read_frame(ic, &packet);
  
          if (decode_done < 0)
  
              break;
  
  
  
          if (av_dup_packet(&packet) < 0)
  
          {
  
              printf("Call av_dup_packet function failed\n");
  
              av_free_packet(&packet);
  
              break;
  
          }
  
  
  
          //[[**
  
          if (packet.stream_index == audio_index) {
  
              segment_time = (double)audio_st->pts.val * audio_st->time_base.num / audio_st->time_base.den;
  
              nRet = av_interleaved_write_frame(oc, &packet);   
  
          } else if (packet.stream_index == video_index) {
  
              if (packet.flags & AV_PKT_FLAG_KEY) {
  
                  segment_time = (double)video_st->pts.val * video_st->time_base.num / video_st->time_base.den;
  
              } else {
  
                  segment_time = prev_segment_time;
  
              }
  
              //nRet = av_interleaved_write_frame(oc, &packet);  
  
              write_frame(oc, &packet, video_st->codec, bsfc);
  
          }
  
          //]]**
  
  
  
          if (nRet < 0)
  
          {
  
              printf("Call av_interleaved_write_frame function failed: %d\n", nRet);
  
          }
  
          else if (nRet > 0)
  
          {
  
              printf("End of stream requested\n");
  
              av_free_packet(&packet);
  
              break;
  
          }
  
          av_free_packet(&packet);
  
          frame_count++;
  
      }while(!decode_done);
  
  
  
      av_write_trailer(oc);
  
      printf("frame_count = %d\n", frame_count);
  
  
  
      av_bitstream_filter_close(bsfc);  
  
      avcodec_close(video_st->codec);
  
      for(unsigned int k = 0; k < oc->nb_streams; k++)
  
      {
  
          av_freep(&oc->streams[k]->codec);
  
          av_freep(&oc->streams[k]);
  
      }
  
      av_free(oc);
  
      //getchar();
  
      return 0;
  
  }

  Compile this code, to got an executable file named muxts, and then :

  $ ./muxts vid1.mp4 vid1.ts

  No error message printed，but the audio stream was unsynchronized and noise。Check the .ts file using ffmpeg :

  $ ffmpeg -i vid1.ts
  
  ffmpeg version 0.8.14-tessus, Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Jul 29 2013 17:05:18 with llvm_gcc 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2336.1.00)
  
    configuration: --prefix=/usr/local --arch=x86_64 --as=yasm --extra-version=tessus --enable-gpl --enable-nonfree --enable-version3 --disable-ffplay --enable-libvorbis --enable-libmp3lame --enable-libx264 --enable-libxvid --enable-bzlib --enable-zlib --enable-postproc --enable-filters --enable-runtime-cpudetect --enable-debug=3 --disable-optimizations
  
    libavutil    51.  9. 1 / 51.  9. 1
  
    libavcodec   53.  8. 0 / 53.  8. 0
  
    libavformat  53.  5. 0 / 53.  5. 0
  
    libavdevice  53.  1. 1 / 53.  1. 1
  
    libavfilter   2. 23. 0 /  2. 23. 0
  
    libswscale    2.  0. 0 /  2.  0. 0
  
    libpostproc  51.  2. 0 / 51.  2. 0
  
  
  
  Seems stream 0 codec frame rate differs from container frame rate: 180000.00 (180000/1) -> 90000.00 (180000/2)
  
  Input #0, mpegts, from 'vid1.ts':
  
    Duration: 00:00:03.75, start: 0.000000, bitrate: 3656 kb/s
  
    Program 1
  
      Metadata:
  
        service_name    : Service01
  
        service_provider: FFmpeg
  
      Stream #0.0[0x100]: Video: h264 (Baseline), yuv420p, 640x480, 90k tbr, 90k tbn, 180k tbc
  
      Stream #0.1[0x101]: Audio: aac, 48000 Hz, mono, s16, 190 kb/s
  
  At least one output file must be specified

  What should i do ?

  If this issue fixed , how can i concat multi .ts files into single .mp4 file ?

• convert f4v to mp4 with ffmpeg

  9 août 2013, par Winnie Oldright

  Trying to convert f4v to mp4 with ffmpeg

  This file

  FFmpeg :

  ffmpeg -i input.f4v -vcodec copy -acodec copy output.mp4

  In output i have black screen in video and no sound but track seconds are incrementing properly.

  What i'm doing wrong ? Or maybe i need mpg or some other file type in out put (output file type should supports in android).