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• FFmpeg : concat protocol gives corrupt output and skips few frames

  11 décembre 2018, par Prashant_Sarin

  Using :

  var command = "-y -i concat:$concatString -c copy -bsf:a aac_adtstoasc $outputFile"

  output video skips few frames in between and jumps from 4th second to 6th sec

  If i use :

  var command = "-y -i concat:$concatString -c:v libx264 -preset ultrafast -crf 30 $outputFile"

  Then, the output is fine but it is taking too much time with the warning of

  [mp4 @ 0xf7228600] Non-monotonous DTS in output stream 0:1

  The logs are as :

  2018-12-11 13:27:19.146 7435-7435/com.onedayapp.mystory.dev D/com.onedayapp.mystory.oneday.controllers.service.VideoCompositionService: onProgress ----Merge---- [mp4 @ 0xf4524c00] Non-monotonous DTS in output stream 0:1; previous: 705608, current: 210096; changing to 705609. This may result in incorrect timestamps in the output file.
  
  2018-12-11 13:27:19.146 7435-7435/com.onedayapp.mystory.dev D/com.onedayapp.mystory.oneday.controllers.service.VideoCompositionService: onProgress ----Merge---- frame=  745 fps=0.0 q=-1.0 Lsize=    1823kB    time=00:03:04.84 bitrate=  80.8kbits/s speed= 758x    
  
  2018-12-11 13:27:19.147 7435-7435/com.onedayapp.mystory.dev D/com.onedayapp.mystory.oneday.controllers.service.VideoCompositionService: onProgress ----Merge---- video:1781kB audio:32kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.563412%
  
  2018-12-11 13:27:19.148 7435-7435/com.onedayapp.mystory.dev D/com.onedayapp.mystory.oneday.controllers.service.VideoCompositionService: Merged successfully message---------ffmpeg version n3.0.1 Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 4.8 (GCC)  configuration: --target-os=linux --cross-prefix=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/bin/arm-linux-androideabi- --arch=arm --cpu=cortex-a8 --enable-runtime-cpudetect --sysroot=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/sysroot --enable-pic --enable-libx264 --enable-libass --enable-libfreetype --enable-libfribidi --enable-libmp3lame --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/vagrant/SourceCode/ffmpeg-android/ffmpeg-pkg-config --prefix=/home/vagrant/SourceCode/ffmpeg-android/build/armeabi-v7a --extra-cflags='-I/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/include -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all' --extra-ldflags='-L/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/lib -Wl,-z,relro -Wl,-z,now -pie' --extra-libs='-lpng -lexpat -lm' --extra-cxxflags=
  
    libavutil      55. 17.103 / 55. 17.103
  
    libavcodec     57. 24.102 / 57. 24.102
  
    libavformat    57. 25.100 / 57. 25.100
  
    libavdevice    57.  0.101 / 57.  0.101
  
    libavfilter     6. 31.100 /  6. 31.100
  
    libswscale      4.  0.100 /  4.  0.100
  
    libswresample   2.  0.101 /  2.  0.101
  
    libpostproc    54.  0.100 / 54.  0.100
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0xf4524600] Auto-inserting h264_mp4toannexb bitstream filter
  
  Input #0, concat, from '/storage/emulated/0/OneDay/Member/128/Video/Story/94071beb-0b5f-4588-b388-ff78d24c07a8/concatVideo.txt':
  
    Duration: N/A, start: 0.000000, bitrate: 695 kb/s
  
      Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 693 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 2 kb/s
  
      Metadata:
  
        handler_name    : SoundHandler
  
  Output #0, mp4, to '/storage/emulated/0/OneDay/Member/128/Video/Story/94071beb-0b5f-4588-b388-ff78d24c07a8/Final.mp4':
  
    Metadata:
  
      encoder         : Lavf57.25.100
  
      Stream #0:0(und): Video: h264 ([33][0][0][0] / 0x0021), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], q=2-31, 693 kb/s, 25 fps, 25 tbr, 12800 tbn, 12800 tbc
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (LC) ([64][0][0][0] / 0x0040), 44100 Hz, stereo, 2 kb/s
  
      Metadata:
  
        handler_name    : SoundHandler
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:1 -> #0:1 (copy)
  
  Press [q] to stop, [?] for help
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0xf4524600] Auto-inserting h264_mp4toannexb bitstream filter
  
  [mp4 @ 0xf4524c00] Non-monotonous DTS in output stream 0:1; previous: 132096, current: 24152; changing to 132097. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0xf4524c00] Non-monotonous DTS in output stream 0:1; previous: 132097, current: 25176; changing to 132098. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0xf4524c00] Non-monotonous DTS in output stream 0:1; previous: 132098, current: 26200; changing to 132099. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0xf4524c00] Non-monotonous DTS in output stream 0:1; previous: 132099, current: 27224; changing to 132100. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0xf4524c00] Non-monotonous DTS in output stream 0:1; previous: 132100, current: 28248; changing to 132101. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0xf4524c00] Non-monotonous DTS in output stream 0:1; previous: 132101, current: 29272; changing to 132102. This may result in incorrect timestamps in the output file.

  Last few lines are onSuccess() message of when i run with concat Demuxer.
  All files are *.mp4 files.

• Restreaming hls stream to rtmp stream using ffmpeg

  7 décembre 2018, par dhruv shah

  I am trying to re-stream an hls stream to rtmp stream using ffmpeg :

  as example :

  ffmpeg -loglevel debug -re -i "https://hddn01.skylinewebcams.com/live.m3u8?a=c6kekc4h116t1m5jbtei273bq0" -bufsize 4000k -preset ultrafast -vcodec libx264 -tune zerolatency -b:v 900k -an -f flv rtmp://127.0.0.1/live/stream.flv

  The stream is available on the website :
  https://www.skylinewebcams.com/en/webcam/malta/malta/traffic/traffic-cam2.html

  The issue is that input fps value is very low and q value is very high or -1 most of the times.

  Please take a look at the following log :

  ffmpeg version 3.4.2-1~16.04.york0.2 Copyright (c) 2000-2018 the FFmpeg developers
  
    built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.9) 20160609
  
    configuration: --prefix=/usr --extra-version='1~16.04.york0.2' --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avi
  
  synth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --e
  
  nable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-libsoxr --e
  
  nable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi
  
   --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
  
    libavutil      55. 78.100 / 55. 78.100
  
    libavcodec     57.107.100 / 57.107.100
  
    libavformat    57. 83.100 / 57. 83.100
  
    libavdevice    57. 10.100 / 57. 10.100
  
    libavfilter     6.107.100 /  6.107.100
  
    libavresample   3.  7.  0 /  3.  7.  0
  
    libswscale      4.  8.100 /  4.  8.100
  
    libswresample   2.  9.100 /  2.  9.100
  
    libpostproc    54.  7.100 / 54.  7.100
  
  [hls,applehttp @ 0x5649bd7463e0] Opening 'https://hddn01.skylinewebcams.com/03042101ANC5-1544185331502.ts' for reading
  
  [hls,applehttp @ 0x5649bd7463e0] Could not find codec parameters for stream 1 (Audio: aac ([15][0][0][0] / 0x000F), 0 channels, fltp): unspecified sample rate
  
  Consider increasing the value for the 'analyzeduration' and 'probesize' options
  
  Input #0, hls,applehttp, from 'https://hddn01.skylinewebcams.com/live.m3u8?a=c6kekc4h116t1m5jbtei273bq0':
  
    Duration: N/A, start: 22431.033000, bitrate: N/A
  
    Program 0 
  
      Metadata:
  
        variant_bitrate : 0
  
      Stream #0:0: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p, 1280x1024, 12 fps, 12 tbr, 90k tbn, 180k tbc
  
      Metadata:
  
        variant_bitrate : 0
  
      Stream #0:1: Audio: aac ([15][0][0][0] / 0x000F), 0 channels, fltp
  
      Metadata:
  
        variant_bitrate : 0
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
  
  Press [q] to stop, [?] for help
  
  [libx264 @ 0x5649bdc1ba80] VBV maxrate unspecified, assuming CBR
  
  [libx264 @ 0x5649bdc1ba80] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
  
  [libx264 @ 0x5649bdc1ba80] profile Constrained Baseline, level 3.2
  
  [libx264 @ 0x5649bdc1ba80] 264 - core 152 r2854 e9a5903 - H.264/MPEG-4 AVC codec - Copyleft 2003-2017 - http://www.videolan.org/x264.html - options: cabac=0 ref=1 deblock=0:0:0 analyse=0:0 me=dia subme=0 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=4 lookahead_threads=4 sliced_threads=1 slices=4 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=250 keyint_min=12 scenecut=0 intra_refresh=0 rc_lookahead=0 rc=cbr mbtree=0 bitrate=900 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 vbv_maxrate=900 vbv_bufsize=4000 nal_hrd=none filler=0 ip_ratio=1.40 aq=0
  
  Output #0, flv, to 'rtmp://127.0.0.1/live/dhruv.flv':
  
    Metadata:
  
      encoder         : Lavf57.83.100
  
      Stream #0:0: Video: h264 (libx264) ([7][0][0][0] / 0x0007), yuv420p, 1280x1024, q=-1--1, 900 kb/s, 12 fps, 1k tbn, 12 tbc
  
      Metadata:
  
        variant_bitrate : 0
  
        encoder         : Lavc57.107.100 libx264
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/900000 buffer size: 4000000 vbv_delay: -1
  
  [hls,applehttp @ 0x5649bd7463e0] Opening 'https://hddn01.skylinewebcams.com/03042101ANC5-1544185339480.ts' for reading
  
  [hls,applehttp @ 0x5649bd7463e0] Opening 'https://hddn01.skylinewebcams.com/03042101ANC5-1544185347525.ts' for reading
  
  [hls,applehttp @ 0x5649bd7463e0] Opening 'https://hddn01.skylinewebcams.com/03042101ANC5-1544185355483.ts' for reading
  
  [hls,applehttp @ 0x5649bd7463e0] Opening 'https://hddn01.skylinewebcams.com/03042101ANC5-1544185363466.ts' for reading
  
  [hls,applehttp @ 0x5649bd7463e0] Opening 'https://hddn01.skylinewebcams.com/03042101ANC5-1544185371496.ts' for reading
  
  [flv @ 0x5649bdc1aae0] Failed to update header with correct duration.939.0kbits/s speed=0.991x    
  
  [flv @ 0x5649bdc1aae0] Failed to update header with correct filesize.
  
  frame=  552 fps= 12 q=33.0 Lsize=    5261kB time=00:00:45.91 bitrate= 938.6kbits/s speed=0.992x    

  Does anyone know how to stream in real-time ?

• trying to convert mp3 to wav

  7 décembre 2018, par Aakash aggarwal

  I am trying to convert mp3 file to wav format using pyaudio but getting an error
  My code

  from pydub import AudioSegment
  
  sound = AudioSegment.from_mp3("v1.mp3")
  
  sound.export("a.wav", format="wav")

  and I am getting error in line 2 as follow

  CouldntDecodeError : Decoding failed. ffmpeg returned error code : 1

  Output from ffmpeg/avlib :

  b"ffmpeg version 2.8.15-0ubuntu0.16.04.1 Copyright (c) 2000-2018 the FFmpeg developers\n built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1 16.04.10) 20160609\n configuration : —prefix=/usr —extra-version=0ubuntu0.16.04.1 —build-suffix=-ffmpeg —toolchain=hardened —libdir=/usr/lib/x86_64-linux-gnu —incdir=/usr/include/x86_64-linux-gnu —cc=cc —cxx=g++ —enable-gpl —enable-shared —disable-stripping —disable-decoder=libopenjpeg —disable-decoder=libschroedinger —enable-avresample —enable-avisynth —enable-gnutls —enable-ladspa —enable-libass —enable-libbluray —enable-libbs2b —enable-libcaca —enable-libcdio —enable-libflite —enable-libfontconfig —enable-libfreetype —enable-libfribidi —enable-libgme —enable-libgsm —enable-libmodplug —enable-libmp3lame —enable-libopenjpeg —enable-libopus —enable-libpulse —enable-librtmp —enable-libschroedinger —enable-libshine —enable-libsnappy —enable-libsoxr —enable-libspeex —enable-libssh —enable-libtheora —enable-libtwolame —enable-libvorbis —enable-libvpx —enable-libwavpack —enable-libwebp —enable-libx265 —enable-libxvid —enable-libzvbi —enable-openal —enable-opengl —enable-x11grab —enable-libdc1394 —enable-libiec61883 —enable-libzmq —enable-frei0r —enable-libx264 —enable-libopencv\n libavutil 54. 31.100 / 54. 31.100\n libavcodec 56. 60.100 / 56. 60.100\n libavformat 56. 40.101 / 56. 40.101\n libavdevice 56. 4.100 / 56. 4.100\n libavfilter 5. 40.101 / 5. 40.101\n libavresample 2. 1. 0 / 2. 1. 0\n libswscale 3. 1.101 / 3. 1.101\n libswresample 1. 2.101 / 1. 2.101\n libpostproc 53. 3.100 / 53. 3.100\n[mp3 @ 0x2446020] Header missing\n Last message repeated 1045 times\n[mp3 @ 0x243d060] decoding for stream 0 failed\n[mp3 @ 0x243d060] Could not find codec parameters for stream 0 (Audio : mp3, 0 channels, s16p) : unspecified frame size\nConsider increasing the value for the ’analyzeduration’ and ’probesize’ options\nv1.mp3 : could not find codec parameters\nInput #0, mp3, from ’v1.mp3’ :\n Duration : N/A, start : 0.000000, bitrate : N/A\n Stream #0:0 : Audio : mp3, 0 channels, s16p\n[abuffer @ 0x2449660] Value inf for parameter ’time_base’ out of range [0 - 2.14748e+09]\n Last message repeated 3 times\n[abuffer @ 0x2449660] Error setting option time_base to value 1/0.\n[graph 0 input from stream 0:0 @ 0x2449540] Error applying options to the filter.\nError opening filters !\n"