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• FFMPEG and -crf on Android

  12 juin 2014, par mister-viper

  yesterday I managed to build a newer Version of FFMPEG for Android. I directly created a binary which allows me to invoke commands per commandline. I builded the Version using NDK r9d and the 4.8 linux_x86_x64 toolchain.

  After including everything in my Application my goal was to execute the command for which I did the whole effort.

  My goal is to run :

  ffmpeg -i example.mp4 -r 30 -vcodec libx264 -crf 0 output.mp4

  Running this command on the command line via python works absolutly fine. However, running this command on Android does not work.

  1) I get the error that I have to add

  -strict experimental

  After reading FFMPEG docu I found out, that this is due to the libx264. However, I do not understand why I have not to add this comment in the Python version.

  2) After adding the parameter above, I was able to convert the video. However, the result was horrible. The transcoded images were just some noisy blinking green stuff. Thus, I looked for the problem. The problem is the parameter :

  -crf 0

  Due to this parameter, the result was so horrible. However, if I change the parameter to

  -crf 1

  everything is working as expected. BUT : I really want a lossless encoding here. That was the reason for choosing -crf 0. Moreover, this parameter works fine in my python version.

  Can anybody explain to me :
  1) What are I’m doing wrong ?
  2) How can I use -crf 0 on Android ?

  Best regards,
  André

  //Edit :
  Requested Logoutput :

  06-12 19:23:04.841: I/System.out(8983): Starting process
  
  06-12 19:23:04.871: D/dalvikvm(8983): GC_FOR_ALLOC freed 294K, 4% free 9260K/9592K, paused 17ms, total 18ms
  
  06-12 19:23:04.871: I/System.out(8983): ffmpeg version N-63698-g22d1b24 Copyright (c) 2000-2014 the FFmpeg developers
  
  06-12 19:23:04.871: I/System.out(8983):   built on Jun 11 2014 13:17:16 with gcc 4.8 (GCC)
  
  06-12 19:23:04.871: I/System.out(8983):   configuration: --target-os=linux --cross-prefix=arm-linux-androideabi- --arch=arm --cpu=armv7-a --sysroot=/home/andre/Desktop/android-ndk-r9d/platforms/android-9/arch-arm --disable-avdevice --disable-decoder=h264_vdpau --enable-libx264 --enable-gpl --prefix=build/armeabi-v7a-neon --extra-cflags='-I../x264 -DANDROID -I${ANDROID_NDK_ROOT_PATH}/sources/cxx-stl/system/include -march=armv7-a -mfloat-abi=softfp -mfpu=neon' --extra-ldflags='-L../x264 -Wl,--fix-cortex-a8 -L../android-libs -Wl,-rpath-link,../android-libs' --extra-cxxflags='-Wno-multichar -fno-exceptions -fno-rtti'
  
  06-12 19:23:04.871: I/System.out(8983):   libavutil      52. 89.100 / 52. 89.100
  
  06-12 19:23:04.871: I/System.out(8983):   libavcodec     55. 66.100 / 55. 66.100
  
  06-12 19:23:04.871: I/System.out(8983):   libavformat    55. 42.100 / 55. 42.100
  
  06-12 19:23:04.871: I/System.out(8983):   libavfilter     4.  5.100 /  4.  5.100
  
  06-12 19:23:04.871: I/System.out(8983):   libswscale      2.  6.100 /  2.  6.100
  
  06-12 19:23:04.871: I/System.out(8983):   libswresample   0. 19.100 /  0. 19.100
  
  06-12 19:23:04.881: I/System.out(8983):   libpostproc    52.  3.100 / 52.  3.100
  
  06-12 19:23:04.971: I/System.out(8983): Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/storage/emulated/0/screen_recording.mp4':
  
  06-12 19:23:04.971: I/System.out(8983):   Metadata:
  
  06-12 19:23:04.971: I/System.out(8983):     major_brand     : isom
  
  06-12 19:23:04.971: I/System.out(8983):     minor_version   : 0
  
  06-12 19:23:04.971: I/System.out(8983):     compatible_brands: isomiso2avc1
  
  06-12 19:23:04.971: I/System.out(8983):     creation_time   : 2014-06-12 11:52:00
  
  06-12 19:23:04.971: I/System.out(8983):   Duration: 00:00:09.39, start: 0.000000, bitrate: 597 kb/s
  
  06-12 19:23:04.971: I/System.out(8983):     Stream #0:0(eng): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 720x1280, 593 kb/s, SAR 65536:65536 DAR 9:16, 34.07 fps, 90k tbr, 90k tbn, 180k tbc (default)
  
  06-12 19:23:04.971: I/System.out(8983):     Metadata:
  
  06-12 19:23:04.971: I/System.out(8983):       creation_time   : 2014-06-12 11:51:56
  
  06-12 19:23:04.971: I/System.out(8983): [libx264 @ 0x171c930] using SAR=1/1
  
  06-12 19:23:04.981: I/System.out(8983): [libx264 @ 0x171c930] using cpu capabilities: ARMv6 NEON
  
  06-12 19:23:04.991: I/System.out(8983): [libx264 @ 0x171c930] profile High 4:4:4 Predictive, level 3.1, 4:2:0 8-bit
  
  06-12 19:23:04.991: I/System.out(8983): [libx264 @ 0x171c930] 64 - core 142 - 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=0 mixed_ref=1 me_range=16 chroma_me=1 trellis=0 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=0 chroma_qp_offset=0 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc=cqp mbtree=0 qp=0
  
  06-12 19:23:04.991: I/System.out(8983): Output #0, mp4, to '/storage/emulated/0/screen_recording_out.mp4':
  
  06-12 19:23:05.001: I/System.out(8983):   Metadata:
  
  06-12 19:23:05.001: I/System.out(8983):     major_brand     : isom
  
  06-12 19:23:05.001: I/System.out(8983):     minor_version   : 0
  
  06-12 19:23:05.001: I/System.out(8983):     compatible_brands: isomiso2avc1
  
  06-12 19:23:05.001: I/System.out(8983):     encoder         : Lavf55.42.100
  
  06-12 19:23:05.001: I/System.out(8983):     Stream #0:0(eng): Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 720x1280 [SAR 65536:65536 DAR 9:16], q=-1--1, 30 fps, 15360 tbn, 30 tbc (default)
  
  06-12 19:23:05.001: I/System.out(8983):     Metadata:
  
  06-12 19:23:05.001: I/System.out(8983):       creation_time   : 2014-06-12 11:51:56
  
  06-12 19:23:05.001: I/System.out(8983):       encoder         : Lavc55.66.100 libx264
  
  06-12 19:23:05.001: I/System.out(8983): Stream mapping:
  
  06-12 19:23:05.001: I/System.out(8983):   Stream #0:0 -> #0:0 (h264 -> libx264)
  
  06-12 19:23:05.001: I/System.out(8983): Press [q] to stop, [?] for help
  
  06-12 19:23:05.662: I/System.out(8983): frame=   14 fps=0.0 q=0.0 size=      51kB time=00:00:00.23 bitrate=1789.0kbits/s dup=0 drop=7    
  
  06-12 19:23:06.022: I/System.out(8983): frame=   20 fps= 20 q=0.0 size=     127kB time=00:00:00.43 bitrate=2395.1kbits/s dup=0 drop=14    
  
  06-12 19:23:06.602: I/System.out(8983): frame=   25 fps= 16 q=0.0 size=     195kB time=00:00:00.60 bitrate=2659.2kbits/s dup=0 drop=16    
  
  06-12 19:23:07.103: I/System.out(8983): frame=   30 fps= 14 q=0.0 size=     262kB time=00:00:00.76 bitrate=2803.4kbits/s dup=0 drop=21    
  
  06-12 19:23:07.674: I/System.out(8983): frame=   50 fps= 19 q=0.0 size=     276kB time=00:00:01.43 bitrate=1575.9kbits/s dup=0 drop=35    
  
  06-12 19:23:08.174: I/System.out(8983): frame=   70 fps= 22 q=0.0 size=     277kB time=00:00:02.10 bitrate=1079.1kbits/s dup=0 drop=35    
  
  06-12 19:23:08.725: I/System.out(8983): frame=   90 fps= 24 q=0.0 size=     278kB time=00:00:02.76 bitrate= 821.8kbits/s dup=0 drop=35    
  
  06-12 19:23:09.245: I/System.out(8983): frame=  109 fps= 26 q=0.0 size=     291kB time=00:00:03.40 bitrate= 700.3kbits/s dup=0 drop=42    
  
  06-12 19:23:09.746: I/System.out(8983): frame=  125 fps= 27 q=0.0 size=     299kB time=00:00:03.93 bitrate= 622.1kbits/s dup=0 drop=43    
  
  06-12 19:23:10.236: I/System.out(8983): frame=  144 fps= 28 q=0.0 size=     300kB time=00:00:04.56 bitrate= 537.4kbits/s dup=0 drop=44    
  
  06-12 19:23:11.117: I/System.out(8983): frame=  160 fps= 28 q=0.0 size=     337kB time=00:00:05.10 bitrate= 542.1kbits/s dup=0 drop=55    
  
  06-12 19:23:11.277: I/System.out(8983): frame=  162 fps= 26 q=0.0 size=     378kB time=00:00:05.16 bitrate= 598.6kbits/s dup=0 drop=58    
  
  06-12 19:23:11.828: I/System.out(8983): frame=  178 fps= 26 q=0.0 size=     428kB time=00:00:05.70 bitrate= 614.6kbits/s dup=0 drop=59    
  
  06-12 19:23:12.318: I/System.out(8983): frame=  198 fps= 27 q=0.0 size=     429kB time=00:00:06.36 bitrate= 551.6kbits/s dup=0 drop=68    
  
  06-12 19:23:12.829: I/System.out(8983): frame=  214 fps= 27 q=0.0 size=     431kB time=00:00:06.90 bitrate= 511.6kbits/s dup=0 drop=69    
  
  06-12 19:23:13.339: I/System.out(8983): frame=  233 fps= 28 q=0.0 size=     432kB time=00:00:07.53 bitrate= 469.6kbits/s dup=0 drop=70    
  
  06-12 19:23:14.690: I/System.out(8983): frame=  262 fps= 27 q=-1.0 Lsize=     457kB time=00:00:08.73 bitrate= 428.4kbits/s dup=18 drop=76    
  
  06-12 19:23:14.690: I/System.out(8983): video:455kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.401494%
  
  06-12 19:23:14.710: I/System.out(8983): [libx264 @ 0x171c930] frame I:2     Avg QP: 0.00  size: 11390
  
  06-12 19:23:14.710: I/System.out(8983): [libx264 @ 0x171c930] frame P:260   Avg QP: 0.00  size:  1702
  
  06-12 19:23:14.710: I/System.out(8983): [libx264 @ 0x171c930] mb I  I16..4: 97.5%  0.2%  2.3%
  
  06-12 19:23:14.710: I/System.out(8983): [libx264 @ 0x171c930] mb P  I16..4:  5.9%  0.3%  0.1%  P16..4:  0.9%  0.1%  0.0%  0.0%  0.0%    skip:92.8%
  
  06-12 19:23:14.710: I/System.out(8983): [libx264 @ 0x171c930] 8x8 transform intra:3.6% inter:31.8%
  
  06-12 19:23:14.710: I/System.out(8983): [libx264 @ 0x171c930] coded y,uvDC,uvAC intra: 17.3% 9.6% 9.2% inter: 0.4% 0.3% 0.3%
  
  06-12 19:23:14.710: I/System.out(8983): [libx264 @ 0x171c930] i16 v,h,dc,p: 69% 30%  1%  0%
  
  06-12 19:23:14.710: I/System.out(8983): [libx264 @ 0x171c930] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 21% 49% 29%  0%  0%  0%  0%  0%  0%
  
  06-12 19:23:14.710: I/System.out(8983): [libx264 @ 0x171c930] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 46% 31% 14%  1%  2%  2%  2%  1%  1%
  
  06-12 19:23:14.710: I/System.out(8983): [libx264 @ 0x171c930] i8c dc,h,v,p: 80% 16%  3%  0%
  
  06-12 19:23:14.710: I/System.out(8983): [libx264 @ 0x171c930] Weighted P-Frames: Y:5.4% UV:4.6%
  
  06-12 19:23:14.710: I/System.out(8983): [libx264 @ 0x171c930] ref P L0: 74.9%  4.1% 19.6%  1.3%  0.0%
  
  06-12 19:23:14.710: I/System.out(8983): [libx264 @ 0x171c930] kb/s:426.18
  
  06-12 19:23:14.740: I/System.out(8983): Finished
  
  06-12 19:23:14.740: I/System.out(8983): Finished Process

• Correct command to transmit audio to ip camera using ffmpeg ?

  4 novembre 2016, par the_naive

  So I found some hints in this discussion on the correct command to transmit audio to Axis IP camera through using ffmpeg in windows, but still I have not managed to successfully transmit audio to the camera.

  The command I’m using is the following :

  ffmpeg -v debug -y -re -f dshow -i "audio=Microphone (2- High Definition Audio Device)" -c:a pcm_mulaw -ac 1 -ar 16000 -b:a 128k -f flv http://oper
  
  ator:operator@10.10.210.2/axis-cgi/audio/transmit.cgi -multiple_requests 1 -reconnect_at_eof 1 -reconnect_streamed 1 -content_type "audio/basic" -report

  The ouput I get following this command is the following :

  ffmpeg started on 2016-11-04 at 17:32:13
  
  Report written to "ffmpeg-20161104-173213.log"
  
  Command line:
  
  ffmpeg -v debug -y -re -f dshow -i "audio=Microphone (2- High Definition Audio Device)" -c:a pcm_mulaw -ac 1 -ar 16000 -b:a 128k -f flv http://operator:operator@10.10.210.2/axis-cgi/audio/transmit.cgi -content_type audio/basic -multiple_requests 1 -reconnect 1 -reconnect_at_eof 1 -reconnect_streamed 1 -report
  
  ffmpeg version N-82225-gb4e9252 Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 5.4.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-libebur128 --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --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. 35.100 / 55. 35.100
  
    libavcodec     57. 66.101 / 57. 66.101
  
    libavformat    57. 57.100 / 57. 57.100
  
    libavdevice    57.  2.100 / 57.  2.100
  
    libavfilter     6. 66.100 /  6. 66.100
  
    libswscale      4.  3.100 /  4.  3.100
  
    libswresample   2.  4.100 /  2.  4.100
  
    libpostproc    54.  2.100 / 54.  2.100
  
  Splitting the commandline.
  
  Reading option '-v' ... matched as option 'v' (set logging level) with argument 'debug'.
  
  Reading option '-y' ... matched as option 'y' (overwrite output files) with argument '1'.
  
  Reading option '-re' ... matched as option 're' (read input at native frame rate) with argument '1'.
  
  Reading option '-f' ... matched as option 'f' (force format) with argument 'dshow'.
  
  Reading option '-i' ... matched as input file with argument 'audio=Microphone (2- High Definition Audio Device)'.
  
  Reading option '-c:a' ... matched as option 'c' (codec name) with argument 'pcm_mulaw'.
  
  Reading option '-ac' ... matched as option 'ac' (set number of audio channels) with argument '1'.
  
  Reading option '-ar' ... matched as option 'ar' (set audio sampling rate (in Hz)) with argument '16000'.
  
  Reading option '-b:a' ... matched as option 'b' (video bitrate (please use -b:v)) with argument '128k'.
  
  Reading option '-f' ... matched as option 'f' (force format) with argument 'flv'.
  
  Reading option 'http://operator:operator@10.10.210.2/axis-cgi/audio/transmit.cgi' ... matched as output file.
  
  Reading option '-content_type' ... matched as AVOption 'content_type' with argument 'audio/basic'.
  
  Reading option '-multiple_requests' ... matched as AVOption 'multiple_requests' with argument '1'.
  
  Reading option '-reconnect' ... matched as AVOption 'reconnect' with argument '1'.
  
  Reading option '-reconnect_at_eof' ... matched as AVOption 'reconnect_at_eof' with argument '1'.
  
  Reading option '-reconnect_streamed' ... matched as AVOption 'reconnect_streamed' with argument '1'.
  
  Reading option '-report' ... matched as option 'report' (generate a report) with argument '1'.
  
  Trailing options were found on the commandline.
  
  Finished splitting the commandline.
  
  Parsing a group of options: global .
  
  Applying option v (set logging level) with argument debug.
  
  Applying option y (overwrite output files) with argument 1.
  
  Applying option report (generate a report) with argument 1.
  
  Successfully parsed a group of options.
  
  Parsing a group of options: input file audio=Microphone (2- High Definition Audio Device).
  
  Applying option re (read input at native frame rate) with argument 1.
  
  Applying option f (force format) with argument dshow.
  
  Successfully parsed a group of options.
  
  Opening an input file: audio=Microphone (2- High Definition Audio Device).
  
  [dshow @ 00000000000279e0] Selecting pin Capture on audio only
  
  dshow passing through packet of type audio size    88200 timestamp 310221040000 orig timestamp 310221040000 graph timestamp 310226130000 diff 5090000 Microphone (2- High Definition Audio Device)
  
  [dshow @ 00000000000279e0] All info found
  
  Guessed Channel Layout for Input Stream #0.0 : stereo
  
  Input #0, dshow, from 'audio=Microphone (2- High Definition Audio Device)':
  
    Duration: N/A, start: 31022.104000, bitrate: 1411 kb/s
  
      Stream #0:0, 1, 1/10000000: Audio: pcm_s16le, 44100 Hz, stereo, s16, 1411 kb/s
  
  Successfully opened the file.
  
  Parsing a group of options: output file http://operator:operator@10.10.210.2/axis-cgi/audio/transmit.cgi.
  
  Applying option c:a (codec name) with argument pcm_mulaw.
  
  Applying option ac (set number of audio channels) with argument 1.
  
  Applying option ar (set audio sampling rate (in Hz)) with argument 16000.
  
  Applying option b:a (video bitrate (please use -b:v)) with argument 128k.
  
  Applying option f (force format) with argument flv.
  
  Successfully parsed a group of options.
  
  Opening an output file: http://operator:operator@10.10.210.2/axis-cgi/audio/transmit.cgi.
  
  [http @ 0000000001c94040] Setting default whitelist 'http,https,tls,rtp,tcp,udp,crypto,httpproxy'
  
  [http @ 0000000001c94040] request: POST /axis-cgi/audio/transmit.cgi HTTP/1.1
  
  
  
  Transfer-Encoding: chunked
  
  
  
  User-Agent: Lavf/57.57.100
  
  
  
  Accept: */*
  
  
  
  Expect: 100-continue
  
  
  
  Connection: close
  
  
  
  Host: 10.10.210.2
  
  
  
  Icy-MetaData: 1
  
  
  
  
  
  
  
  
  
  [http @ 0000000001c94040] request: POST /axis-cgi/audio/transmit.cgi HTTP/1.1
  
  
  
  Transfer-Encoding: chunked
  
  
  
  User-Agent: Lavf/57.57.100
  
  
  
  Accept: */*
  
  
  
  Connection: close
  
  
  
  Host: 10.10.210.2
  
  
  
  Icy-MetaData: 1
  
  
  
  Authorization: Digest username="operator", realm="AXIS_ACCC8E027F47", nonce="0EcsO3xABQA=ab5efc4740a6c625ecf6a6729d0d67d2b62b615a", uri="/axis-cgi/audio/transmit.cgi", response="4bd3a627b20d6bcaba9e2f595ef6cd2a", algorithm="MD5", qop="auth", cnonce="6a579dd6664b57eb", nc=00000001
  
  
  
  
  
  
  
  
  
  Successfully opened the file.
  
  detected 8 logical cores
  
  [graph 0 input from stream 0:0 @ 0000000001c9f6e0] Setting 'time_base' to value '1/44100'
  
  [graph 0 input from stream 0:0 @ 0000000001c9f6e0] Setting 'sample_rate' to value '44100'
  
  [graph 0 input from stream 0:0 @ 0000000001c9f6e0] Setting 'sample_fmt' to value 's16'
  
  [graph 0 input from stream 0:0 @ 0000000001c9f6e0] Setting 'channel_layout' to value '0x3'
  
  [graph 0 input from stream 0:0 @ 0000000001c9f6e0] tb:1/44100 samplefmt:s16 samplerate:44100 chlayout:0x3
  
  [audio format for output stream 0:0 @ 0000000001c9fa20] Setting 'sample_fmts' to value 's16'
  
  [audio format for output stream 0:0 @ 0000000001c9fa20] Setting 'sample_rates' to value '16000'
  
  [audio format for output stream 0:0 @ 0000000001c9fa20] Setting 'channel_layouts' to value '0x4'
  
  [audio format for output stream 0:0 @ 0000000001c9fa20] auto-inserting filter 'auto-inserted resampler 0' between the filter 'Parsed_anull_0' and the filter 'audio format for output stream 0:0'
  
  [AVFilterGraph @ 000000000002ab20] query_formats: 4 queried, 6 merged, 3 already done, 0 delayed
  
  [auto-inserted resampler 0 @ 0000000001ca4060] [SWR @ 0000000001ca4a80] Using s16p internally between filters
  
  [auto-inserted resampler 0 @ 0000000001ca4060] [SWR @ 0000000001ca4a80] Matrix coefficients:
  
  [auto-inserted resampler 0 @ 0000000001ca4060] [SWR @ 0000000001ca4a80] FC: FL:0.500000 FR:0.500000 
  
  [auto-inserted resampler 0 @ 0000000001ca4060] ch:2 chl:stereo fmt:s16 r:44100Hz -> ch:1 chl:mono fmt:s16 r:16000Hz
  
  Output #0, flv, to 'http://operator:operator@10.10.210.2/axis-cgi/audio/transmit.cgi':
  
    Metadata:
  
      encoder         : Lavf57.57.100
  
      Stream #0:0, 0, 1/1000: Audio: pcm_mulaw ([8][0][0][0] / 0x0008), 16000 Hz, mono, s16, 128 kb/s
  
      Metadata:
  
        encoder         : Lavc57.66.101 pcm_mulaw
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (pcm_s16le (native) -> pcm_mulaw (native))
  
  Press [q] to stop, [?] for help
  
  cur_dts is invalid (this is harmless if it occurs once at the start per stream)
  
  av_interleaved_write_frame(): Unknown error
  
  No more output streams to write to, finishing.
  
  Error writing trailer of http://operator:operator@10.10.210.2/axis-cgi/audio/transmit.cgi: Error number -10053 occurredsize=       8kB time=00:00:00.49 bitrate= 131.2kbits/s speed=79.6x    
  
  video:0kB audio:8kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 2.492485%
  
  Input file #0 (audio=Microphone (2- High Definition Audio Device)):
  
    Input stream #0:0 (audio): 1 packets read (88200 bytes); 1 frames decoded (22050 samples); 
  
    Total: 1 packets (88200 bytes) demuxed
  
  Output file #0 (http://operator:operator@10.10.210.2/axis-cgi/audio/transmit.cgi):
  
    Output stream #0:0 (audio): 1 frames encoded (7984 samples); 1 packets muxed (7984 bytes); 
  
    Total: 1 packets (7984 bytes) muxed
  
  1 frames successfully decoded, 0 decoding errors
  
  [AVIOContext @ 0000000001c9e4c0] Statistics: 0 seeks, 2 writeouts
  
  dshow passing through packet of type audio size    12152 timestamp 310226130000 orig timestamp 310226130000 graph timestamp 310226820000 diff 690000 Microphone (2- High Definition Audio Device)
  
  Conversion failed!

  For some reason, despite setting multiple_requests, reconnect_eof, reconnect_streamed all to true, connection becomes closed.

  Could you please tell me what I’m doing wrong ?

• Checking processor capabilities in android

  29 avril 2014, par StackOverflowed

  I’m using FFMPEG in an app, and I’m using the following configuration :

  --extra-cflags=' -march=armv7-a -mfloat-abi=softfp -mfpu=neon'

  I’m targeting 4.0+ so I believe armv7-a should be supported by most non Intel devices, and I’m sure the neon extension is supported in most devices as well, but I’m not sure how I can find that out for all 2000+ devices.

  Is there a way to check in Android the processor type and extensions and/or in the Google Play Store to limit the apk to devices with certain processors ?