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• Immidiately display first and latest frame of h264 stream which may sometimes pause

  22 septembre 2016, par jorp

  Steps to reproduce :

  1.Connect android device to linux PC via USB.
  

  2.Run command on pc :
  adb shell screenrecord --output-format=h264 - | ffplay -analyzeduration 1 -

  3.Screenrecord(an Android system tool) will start to capture Android screen, encode by MediaCodec, generate h264 stream, send stream data to ffplay via pipe.

  4.PC will pop up ffplay window, and start display Android screen graphs

  ---

  If adb command runs when Android screen graph keeps static (no pixel color changes), ffplay window won’t pop up, until I touch somewhere to make Android graph changes.

  Question 1 : how to make ffplay to immidiately display the first frame of video when Android screen keeps static and adb commmand runs ?

  I’m not talking about "latency", if Android graph keeps changing, the graphic latency is within 2 second. It’s fast enough.

  when Android graph is static, run command without ffplay :
  adb shell screenrecord --output-format=h264 -

  screenrecord will output H264 stream data immidiately then pause.(See picture below).
  stream data comes first

  Does the data contain all information of first frame graph ?
  If so, how to make ffplay to display it immidiately ?

  ---

  Question 2 : how to make ffplay to immidiately display the latest frame of video when Android screen suddenly become static ?

  When Android screen start casting and Android graph suddenly become static, H264 data stream transfer will pause, while PC graph is different with Android graph.

  For example, I make a popup menu on Android disappear, there has been a fadeoff animation, PC graph pauses and display a translucent popup menu.(See picture below)

  latest graph on pc

  The first and latest frames of stream doesn’t display in ffplay immidiately, they are "missing".
  when Android screen go on changing, the "missing" frames displays.
  So it seems like the latest frames are always in buffer.

  I’ve tried adding these params to ffplay :
  

  -noinfbuf
-fflags nobuffer
-max_delay 0
-sync ext
-preset ultrafast
-tune zerolatency

  
  They cannot solve the problems

  Modifing Android ROM or screenrecord source, making a pixel color changes every frame, may solve the problems(I guess), but it would enlarge data stream, it’s the last choise.
  Is there any solution by adding params of ffplay, or by modifing screenrecord or ffplay source code ?

  PS : mplayer also has the same problem :
  mplayer -demuxer h264es -

• Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height

  6 juillet 2016, par olega

  Found a lot of helpful answers. But could not find for my problem.
  I am trying to convert .mp4 to .webm. I tried with parameters, without them (like below), but always got same result :

  ================

  ---

  Converting (dseoFRQrJehleLDHPdcB.mp4) started - Tue - Jul 05, 2016 @ 06:29 PM

  ---

  /usr/local/bin/ffmpeg -i public_html/uploads/avi/dseoFRQrJehleLDHPdcB.mp4 public_html/uploads/dseoFRQrJehleLDHPdcB.webm

  ffmpeg version N-80913-gd915b6e Copyright (c) 2000-2016 the FFmpeg developers

  built with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4.7-16)

  configuration : —enable-libvpx —enable-libvorbis

  libavutil 55. 28.100 / 55. 28.100

  libavcodec 57. 48.101 / 57. 48.101

  libavformat 57. 41.100 / 57. 41.100

  libavdevice 57. 0.102 / 57. 0.102

  libavfilter 6. 47.100 / 6. 47.100

  libswscale 4. 1.100 / 4. 1.100

  libswresample 2. 1.100 / 2. 1.100

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from
  ’/home/supergirl/public_html/uploads/avi/dseoFRQrJehleLDHPdcB.mp4’ :

  Metadata :

  major_brand     : isom
  
  
  
  minor_version   : 512
  
  
  
  compatible_brands: isomiso2avc1mp41
  
  
  
  creation_time   : 1970-01-01 00:00:00
  
  
  
  encoder         : Lavf53.24.2

  Duration : 00:00:05.31, start : 0.000000, bitrate : 1589 kb/s

  Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 1205 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
  
  
  
  Metadata:
  
  
  
    creation_time   : 1970-01-01 00:00:00
  
  
  
    handler_name    : VideoHandler
  
  
  
  Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp, 384 kb/s (default)
  
  
  
  Metadata:
  
  
  
    creation_time   : 1970-01-01 00:00:00
  
  
  
    handler_name    : SoundHandler

  [libvpx @ 0x21fd880] v1.2.0

  [libvpx @ 0x21fd880] Failed to initialize encoder : ABI version mismatch

  Output #0, webm, to ’/home/supergirl/public_html/uploads/dseoFRQrJehleLDHPdcB.webm’ :

  Metadata :

  major_brand     : isom
  
  
  
  minor_version   : 512
  
  
  
  compatible_brands: isomiso2avc1mp41
  
  
  
  encoder         : Lavf53.24.2
  
  
  
  Stream #0:0(und): Unknown: none, SAR 1:1 DAR 0:0 (default)
  
  
  
  Metadata:
  
  
  
    creation_time   : 1970-01-01 00:00:00
  
  
  
    handler_name    : VideoHandler
  
  
  
    encoder         : Lavc57.48.101 libvpx
  
  
  
  Stream #0:1(und): Unknown: none (default)
  
  
  
  Metadata:
  
  
  
    creation_time   : 1970-01-01 00:00:00
  
  
  
    handler_name    : SoundHandler
  
  
  
    encoder         : Lavc57.48.101 libvorbis

  Stream mapping :

  Stream #0:0 -> #0:0 (h264 (native) -> vp8 (libvpx))

  Stream #0:1 -> #0:1 (aac (native) -> vorbis (libvorbis))

  Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height

  ================

  Any suggestions, please ?

• FFMPEG - Concatenate 2 MP4 Files, one has video and audio and the other has only audio

  5 août 2016, par Avi

  I am trying to merge 2 mp4 files using FFMPEG. One of these files has both video and audio (track1.mp4), while the other one has only audio (track2.mp4). The names of these files are listed in a text file called 'filesToMerge.txt' in the following manner :

  file 'track1.mp4'
  
  file 'track2.mp4'

  I then execute the following ffmpeg command to merge them.

  ffmpeg -f concat -i filesToMerge.txt -c copy output.mp4

  However, the concatenated file that is generated consists of only the first file that is listed in filesToMerge.txt. That is, if track1.mp4 (which has both video and audio) is the first file in the list, then only that file makes up output.mp4 (the concatenated file produced) and vice versa.

  I would like for both files to be in output.mp4. I am using Ubuntu 14.04 (if that helps). How can I solve this problem ?

  When I run this command
  ffmpeg -i track1.mp4 -i track2.mp4 output.mp4
  I get the following

  ffmpeg version N-76944-g15206ff Copyright (c) 2000-2015 the FFmpeg developers
  
        built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04)
  
        configuration: --extra-libs=-ldl --prefix=/opt/ffmpeg --enable-avresample --disable-debug --enable-nonfree --enable-gpl --enable-version3 --enable-libopencore-amrnb --enable-libopencore-amrwb --disable-decoder=amrnb --disable-decoder=amrwb --enable-libpulse --enable-libdcadec --enable-libfreetype --enable-libx264 --enable-libx265 --enable-libfdk-aac --enable-libvorbis --enable-libmp3lame --enable-libopus --enable-libvpx --enable-libspeex --enable-libass --enable-avisynth --enable-libsoxr --enable-libxvid --enable-libvo-aacenc --enable-libvidstab
  
        libavutil      55.  9.100 / 55.  9.100
  
        libavcodec     57. 16.101 / 57. 16.101
  
        libavformat    57. 19.100 / 57. 19.100
  
        libavdevice    57.  0.100 / 57.  0.100
  
        libavfilter     6. 17.100 /  6. 17.100
  
        libavresample   3.  0.  0 /  3.  0.  0
  
        libswscale      4.  0.100 /  4.  0.100
  
        libswresample   2.  0.101 /  2.  0.101
  
        libpostproc    54.  0.100 / 54.  0.100
  
      Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'track1.mp4':
  
        Metadata:
  
          major_brand     : isom
  
          minor_version   : 512
  
          compatible_brands: isomiso2avc1mp41
  
          encoder         : Lavf56.40.101
  
        Duration: 00:00:10.76, start: 0.023220, bitrate: 351 kb/s
  
          Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 800x400 [SAR 400:533 DAR 800:533], 181 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
  
          Metadata:
  
            handler_name    : VideoHandler
  
          Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 194 kb/s (default)
  
          Metadata:
  
            handler_name    : SoundHandler
  
      Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'track2.mp4':
  
        Metadata:
  
          major_brand     : isom
  
          minor_version   : 512
  
          compatible_brands: isomiso2mp41
  
          creation_time   : 1970-01-01 00:00:00
  
          encoder         : Lavf52.32.0
  
        Duration: 00:00:32.21, start: 0.000000, bitrate: 46 kb/s
  
          Stream #1:0(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 43 kb/s (default)
  
          Metadata:
  
            creation_time   : 1970-01-01 00:00:00
  
            handler_name    : SoundHandler
  
      [libx264 @ 0x3950ce0] using SAR=400/533
  
      [libx264 @ 0x3950ce0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX AVX2 FMA3 LZCNT BMI2
  
      [libx264 @ 0x3950ce0] profile High, level 3.0
  
      [libx264 @ 0x3950ce0] 264 - core 142 r2491 24e4fed - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 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_pskip=1 chroma_qp_offset=-2 threads=1 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
      Output #0, mp4, to 'output.mp4':
  
        Metadata:
  
          major_brand     : isom
  
          minor_version   : 512
  
          compatible_brands: isomiso2avc1mp41
  
          encoder         : Lavf57.19.100
  
          Stream #0:0(und): Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 800x400 [SAR 400:533 DAR 800:533], q=-1--1, 25 fps, 12800 tbn, 25 tbc (default)
  
          Metadata:
  
            handler_name    : VideoHandler
  
            encoder         : Lavc57.16.101 libx264
  
          Stream #0:1(und): Audio: aac (libfdk_aac) ([64][0][0][0] / 0x0040), 44100 Hz, stereo, s16, 128 kb/s (default)
  
          Metadata:
  
            handler_name    : SoundHandler
  
            encoder         : Lavc57.16.101 libfdk_aac
  
      Stream mapping:
  
        Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
  
        Stream #0:1 -> #0:1 (aac (native) -> aac (libfdk_aac))
  
      Press [q] to stop, [?] for help
  
      frame=  270 fps= 99 q=28.0 Lsize=     382kB time=00:00:10.72 bitrate= 291.9kbits/s dup=1 drop=0    
  
      video:230kB audio:143kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 2.482656%
  
      [libx264 @ 0x3950ce0] frame I:2     Avg QP:18.87  size:109452
  
      [libx264 @ 0x3950ce0] frame P:68    Avg QP:15.09  size:   171
  
      [libx264 @ 0x3950ce0] frame B:200   Avg QP:23.33  size:    23
  
      [libx264 @ 0x3950ce0] consecutive B-frames:  1.1%  0.0%  1.1% 97.8%
  
      [libx264 @ 0x3950ce0] mb I  I16..4: 11.0% 39.6% 49.5%
  
      [libx264 @ 0x3950ce0] mb P  I16..4:  0.0%  0.0%  0.0%  P16..4:  5.9%  0.1%  0.0%  0.0%  0.0%    skip:93.9%
  
      [libx264 @ 0x3950ce0] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  0.3%  0.0%  0.0%  direct: 0.0%  skip:99.7%  L0:21.8% L1:78.2% BI: 0.0%
  
      [libx264 @ 0x3950ce0] 8x8 transform intra:39.7% inter:92.8%
  
      [libx264 @ 0x3950ce0] coded y,uvDC,uvAC intra: 92.0% 95.0% 73.2% inter: 0.1% 1.4% 0.0%
  
      [libx264 @ 0x3950ce0] i16 v,h,dc,p:  1% 30%  4% 66%
  
      [libx264 @ 0x3950ce0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu:  6% 55% 16%  2%  4%  2%  8%  2%  6%
  
      [libx264 @ 0x3950ce0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 17% 18% 13%  7%  9%  7% 12%  6% 11%
  
      [libx264 @ 0x3950ce0] i8c dc,h,v,p: 44% 35% 10% 11%
  
      [libx264 @ 0x3950ce0] Weighted P-Frames: Y:0.0% UV:0.0%
  
      [libx264 @ 0x3950ce0] ref P L0: 98.1%  0.2%  1.1%  0.5%
  
      [libx264 @ 0x3950ce0] ref B L0: 85.1% 13.2%  1.7%
  
      [libx264 @ 0x3950ce0] ref B L1: 93.6%  6.4%
  
      [libx264 @ 0x3950ce0] kb/s:174.10