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  • Using ffmpeg for streaming video composition from Python : why the sound is cut only when streaming into a mp4 file ?

    4 décembre 2017, par redantlabs

    I am using ffmpeg within Python for automatizing some video compositions. To do so, I am using the subprocess module of Python and run a ffmpeg command with a pipe input. This allows me to stream frame by frame the video composition from my array of raw images (numpy matrices) into ffmpeg. In the following example, I reduced the video composition to a simple video of a duration of 12 seconds. The produced ffmpeg command is :

    ffmpeg -i stream_audio.mp3 -re -f rawvideo -vcodec rawvideo -s 1280x720 -pix_fmt rgb24 -r 25 -i - -map 0:a -map 1:v -y -strict -2 -f mp4 -pix_fmt yuv420p out.mp4

    The file stream_audio.mp3 is a well formed mp3 file corresponding to the audio output of the output mp4 file. However, the sound in the output file out.mp4 is cut 3 seconds before the end.

    If I am trying to output any other format (for example avi), I do not observe this problem. The following command produces a well formed avi file.

     ffmpeg -i ./stream_audio.mp3 -re -f rawvideo -vcodec rawvideo -s 1280x720 -pix_fmt rgb24 -r 25 -i - -map 0:a -map 1:v -y -b 4096k -f avi -pix_fmt yuv420p out.avi

    I tried to reproduce the bug with the most simple ffmpeg command without passing by Python, but did not succeed.The closest I have done is the following :

    Building a raw video file with the correct specifications

    ffmpeg -i samplevideo.mp4 -f rawvideo -vcodec rawvideo -acodec none -s 1280x720 -pix_fmt rgb24 -r 25 samplevideo.raw

    Streaming the raw video file into the ffmpeg command

    cat samplevideo.raw | ffmpeg -i /tmp/stream_audio.mp3 -re -f rawvideo -vcodec rawvideo -s 1280x720 -pix_fmt rgb24 -r 25 -i - -map 0:a -map 1:v 
    
-y -strict -2 -f mp4 -pix_fmt yuv420p  -ss 00:00:00 -t 00:00:12 out.mp4

    Here is the version of ffmpeg I am using :

    ffmpeg version 3.1.9 Copyright (c) 2000-2017 the FFmpeg developers
    
  built with gcc 6.3.1 (GCC) 20161221 (Red Hat 6.3.1-1)
    
  configuration: --prefix=/usr --bindir=/usr/bin --datadir=/usr/share/ffmpeg --incdir=/usr/include/ffmpeg --libdir=/usr/lib64 --mandir=/usr/share/man --arch=x86_64 --optflags='-O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -m64 -mtune=generic' --extra-ldflags='-Wl,-z,relro -specs=/usr/lib/rpm/redhat/redhat-hardened-ld' --enable-bzlib --disable-crystalhd --enable-fontconfig --enable-frei0r --enable-gcrypt --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libcdio --enable-indev=jack --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libmp3lame --enable-nvenc --extra-cflags=-I/usr/include/nvenc --enable-openal --enable-opencl --enable-opengl --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libv4l2 --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-x11grab --enable-avfilter --enable-avresample --enable-postproc --enable-pthreads --disable-static --enable-shared --enable-gpl --disable-debug --disable-stripping --shlibdir=/usr/lib64 --enable-libmfx --enable-runtime-cpudetect
    
  libavutil      55. 28.100 / 55. 28.100
    
  libavcodec     57. 48.101 / 57. 48.101
    
  libavformat    57. 41.100 / 57. 41.100
    
  libavdevice    57.  0.101 / 57.  0.101
    
  libavfilter     6. 47.100 /  6. 47.100
    
  libavresample   3.  0.  0 /  3.  0.  0
    
  libswscale      4.  1.100 /  4.  1.100
    
  libswresample   2.  1.100 /  2.  1.100
    
  libpostproc    54.  0.100 / 54.  0.100
    
Hyper fast Audio and Video encoder

    The file samplevideo.mp4 can be found here : sample videos, the stream_audio.mp3 file is a simple extraction of the audio track of the samplevideo.mp4 file :

    ffmpeg -i samplevideo.mp4 stream_audio.mp3

    Thanks for your help.

    p.s : Here are the different logs of the ffmpeg commands :

    Command generated by my Python script with mp4 :

    Input #0, mp3, from './stream_audio.mp3':
    
  Metadata:
    
    major_brand     : isom
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1mp41
    
    encoder         : Lavf57.41.100
    
  Duration: 00:00:29.59, start: 0.023021, bitrate: 128 kb/s
    
    Stream #0:0: Audio: mp3, 48000 Hz, stereo, s16p, 128 kb/s
    
    Metadata:
    
      encoder         : Lavc57.48
    
Input #1, rawvideo, from 'pipe:':
    
  Duration: N/A, start: 0.000000, bitrate: 552960 kb/s
    
    Stream #1:0: Video: rawvideo (RGB[24] / 0x18424752), rgb24, 1280x720, 552960 kb/s, 25 tbr, 25 tbn, 25 tbc
    
[libx264 @ 0xf5cb748ac0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 AVX2 LZCNT BMI2
    
[libx264 @ 0xf5cb748ac0] profile High, level 3.1
    
[libx264 @ 0xf5cb748ac0] 264 - core 148 r2708 86b7198 - H.264/MPEG-4 AVC codec - Copyleft 2003-2016 - 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=6 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
    
[mp4 @ 0xf5cb7462a0] Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead.
    
    Last message repeated 1 times
    
Output #0, mp4, to 'out.mp4':
    
  Metadata:
    
    major_brand     : isom
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1mp41
    
    encoder         : Lavf57.41.100
    
    Stream #0:0: Audio: aac (LC) ([64][0][0][0] / 0x0040), 48000 Hz, stereo, fltp, 128 kb/s
    
    Metadata:
    
      encoder         : Lavc57.48.101 aac
    
    Stream #0:1: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 1280x720, q=-1--1, 25 fps, 12800 tbn, 25 tbc
    
    Metadata:
    
      encoder         : Lavc57.48.101 libx264
    
    Side data:
    
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (mp3 (native) -> aac (native))
    
  Stream #1:0 -> #0:1 (rawvideo (native) -> h264 (libx264))
    
[rawvideo @ 0xf5cb722860] Thread message queue blocking; consider raising the thread_queue_size option (current value: 8)
    
frame=   14 fps=0.0 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
    
frame=   27 fps= 27 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
    
frame=   40 fps= 26 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
    
frame=   52 fps= 26 q=28.0 size=     113kB time=00:00:00.00 bitrate=N/A speed=   0x    
    
frame=   65 fps= 26 q=28.0 size=     188kB time=00:00:00.49 bitrate=3145.8kbits/s speed=0.194x    
    
frame=   77 fps= 25 q=28.0 size=     320kB time=00:00:01.00 bitrate=2615.3kbits/s speed=0.331x    
    
frame=   90 fps= 25 q=28.0 size=     450kB time=00:00:01.51 bitrate=2431.3kbits/s speed=0.428x    
    
frame=  103 fps= 25 q=28.0 size=     592kB time=00:00:02.00 bitrate=2418.9kbits/s speed=0.496x    
    
frame=  116 fps= 25 q=28.0 size=     731kB time=00:00:02.52 bitrate=2376.1kbits/s speed=0.554x    
    
frame=  128 fps= 25 q=28.0 size=     849kB time=00:00:03.02 bitrate=2295.6kbits/s speed=0.599x    
    
frame=  141 fps= 25 q=28.0 size=     931kB time=00:00:03.54 bitrate=2153.0kbits/s speed=0.637x    
    
frame=  153 fps= 25 q=28.0 size=     983kB time=00:00:04.03 bitrate=1996.7kbits/s speed=0.665x    
    
frame=  166 fps= 25 q=28.0 size=    1067kB time=00:00:04.56 bitrate=1914.5kbits/s speed=0.695x    
    
frame=  179 fps= 25 q=28.0 size=    1123kB time=00:00:05.04 bitrate=1824.8kbits/s speed=0.712x    
    
frame=  191 fps= 25 q=28.0 size=    1213kB time=00:00:05.54 bitrate=1791.0kbits/s speed=0.732x    
    
frame=  204 fps= 25 q=28.0 size=    1271kB time=00:00:06.05 bitrate=1718.5kbits/s speed=0.749x    
    
frame=  217 fps= 25 q=28.0 size=    1346kB time=00:00:06.57 bitrate=1678.1kbits/s speed=0.764x    
    
frame=  230 fps= 25 q=28.0 size=    1452kB time=00:00:07.08 bitrate=1678.9kbits/s speed=0.778x    
    
frame=  242 fps= 25 q=28.0 size=    1567kB time=00:00:07.59 bitrate=1690.3kbits/s speed=0.79x    
    
frame=  255 fps= 25 q=28.0 size=    1660kB time=00:00:08.08 bitrate=1682.4kbits/s speed=0.799x    
    
frame=  267 fps= 25 q=28.0 size=    1739kB time=00:00:08.59 bitrate=1657.1kbits/s speed=0.81x    
    
frame=  280 fps= 25 q=28.0 size=    1751kB time=00:00:09.08 bitrate=1578.1kbits/s speed=0.817x    
    
frame=  291 fps= 24 q=-1.0 Lsize=    1864kB time=00:00:11.52 bitrate=1325.7kbits/s speed=0.954x    
    
video:1707kB audio:149kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.437266%
    
[aac @ 0xf5cb747540] Qavg: 202.422
    
[libx264 @ 0xf5cb748ac0] frame I:2     Avg QP:15.83  size: 78710
    
[libx264 @ 0xf5cb748ac0] frame P:183   Avg QP:21.13  size:  7293
    
[libx264 @ 0xf5cb748ac0] frame B:106   Avg QP:26.82  size:  2406
    
[libx264 @ 0xf5cb748ac0] consecutive B-frames: 47.8% 10.3%  2.1% 39.9%
    
[libx264 @ 0xf5cb748ac0] mb I  I16..4: 22.1% 32.5% 45.4%
    
[libx264 @ 0xf5cb748ac0] mb P  I16..4:  0.8%  1.4%  0.2%  P16..4: 25.3%  6.3%  3.1%  0.0%  0.0%    skip:62.9%
    
[libx264 @ 0xf5cb748ac0] mb B  I16..4:  0.1%  0.2%  0.0%  B16..8: 39.0%  1.7%  0.2%  direct: 0.4%  skip:58.5%  L0:47.3% L1:49.6% BI: 3.1%
    
[libx264 @ 0xf5cb748ac0] 8x8 transform intra:50.3% inter:57.9%
    
[libx264 @ 0xf5cb748ac0] coded y,uvDC,uvAC intra: 49.5% 65.3% 23.0% inter: 7.8% 10.2% 0.5%
    
[libx264 @ 0xf5cb748ac0] i16 v,h,dc,p: 30% 32% 11% 27%
    
[libx264 @ 0xf5cb748ac0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 25% 21% 23%  4%  5%  7%  5%  5%  5%
    
[libx264 @ 0xf5cb748ac0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 23% 15% 11%  8%  8%  9%  7% 12%  7%
    
[libx264 @ 0xf5cb748ac0] i8c dc,h,v,p: 51% 20% 21%  8%
    
[libx264 @ 0xf5cb748ac0] Weighted P-Frames: Y:0.0% UV:0.0%
    
[libx264 @ 0xf5cb748ac0] ref P L0: 79.8% 11.4%  7.6%  1.2%
    
[libx264 @ 0xf5cb748ac0] ref B L0: 96.9%  2.8%  0.4%
    
[libx264 @ 0xf5cb748ac0] ref B L1: 97.7%  2.3%
    
[libx264 @ 0xf5cb748ac0] kb/s:1200.72
    
Exiting normally, received signal 15.

    Command generated by my Python script with avi :

    Input #0, mp3, from './stream_audio.mp3':
    
  Metadata:
    
    major_brand     : isom
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1mp41
    
    encoder         : Lavf57.41.100
    
  Duration: 00:00:29.59, start: 0.023021, bitrate: 128 kb/s
    
    Stream #0:0: Audio: mp3, 48000 Hz, stereo, s16p, 128 kb/s
    
    Metadata:
    
      encoder         : Lavc57.48
    
Input #1, rawvideo, from 'pipe:':
    
  Duration: N/A, start: 0.000000, bitrate: 552960 kb/s
    
    Stream #1:0: Video: rawvideo (RGB[24] / 0x18424752), rgb24, 1280x720, 552960 kb/s, 25 tbr, 25 tbn, 25 tbc
    
Please use -b:a or -b:v, -b is ambiguous
    
[avi @ 0x82147c30e0] Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead.
    
    Last message repeated 1 times
    
Output #0, avi, to 'out.avi':
    
  Metadata:
    
    major_brand     : isom
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1mp41
    
    ISFT            : Lavf57.41.100
    
    Stream #0:0: Audio: mp3 (libmp3lame) (U[0][0][0] / 0x0055), 48000 Hz, stereo, s16p
    
    Metadata:
    
      encoder         : Lavc57.48.101 libmp3lame
    
    Stream #0:1: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 1280x720, q=2-31, 4096 kb/s, 25 fps, 25 tbn, 25 tbc
    
    Metadata:
    
      encoder         : Lavc57.48.101 mpeg4
    
    Side data:
    
      cpb: bitrate max/min/avg: 0/0/4096000 buffer size: 0 vbv_delay: -1
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (mp3 (native) -> mp3 (libmp3lame))
    
  Stream #1:0 -> #0:1 (rawvideo (native) -> mpeg4 (native))
    
[rawvideo @ 0x821479f820] Thread message queue blocking; consider raising the thread_queue_size option (current value: 8)
    
frame=   14 fps=0.0 q=2.6 size=     553kB time=00:00:00.56 bitrate=8082.6kbits/s speed= 1.1x    
    
frame=   27 fps= 27 q=5.4 size=     858kB time=00:00:01.08 bitrate=6507.5kbits/s speed=1.06x    
    
frame=   40 fps= 26 q=5.9 size=    1089kB time=00:00:01.60 bitrate=5574.9kbits/s speed=1.05x    
    
frame=   52 fps= 26 q=5.5 size=    1332kB time=00:00:02.08 bitrate=5225.6kbits/s speed=1.03x    
    
frame=   65 fps= 26 q=4.9 size=    1582kB time=00:00:02.60 bitrate=4985.6kbits/s speed=1.03x    
    
frame=   78 fps= 26 q=4.3 size=    1816kB time=00:00:03.12 bitrate=4768.1kbits/s speed=1.03x    
    
frame=   90 fps= 25 q=2.8 size=    2035kB time=00:00:03.60 bitrate=4631.7kbits/s speed=1.02x    
    
frame=  103 fps= 25 q=2.3 size=    2288kB time=00:00:04.12 bitrate=4549.8kbits/s speed=1.02x    
    
frame=  116 fps= 25 q=2.4 size=    2558kB time=00:00:04.64 bitrate=4516.3kbits/s speed=1.02x    
    
frame=  128 fps= 25 q=2.3 size=    2835kB time=00:00:05.12 bitrate=4535.4kbits/s speed=1.01x    
    
frame=  141 fps= 25 q=3.1 size=    3103kB time=00:00:05.64 bitrate=4506.6kbits/s speed=1.01x    
    
frame=  154 fps= 25 q=2.8 size=    3381kB time=00:00:06.16 bitrate=4495.9kbits/s speed=1.01x    
    
frame=  166 fps= 25 q=3.4 size=    3648kB time=00:00:06.64 bitrate=4494.9kbits/s speed=1.01x    
    
frame=  179 fps= 25 q=3.3 size=    3894kB time=00:00:07.16 bitrate=4455.7kbits/s speed=1.01x    
    
frame=  192 fps= 25 q=3.2 size=    4128kB time=00:00:07.68 bitrate=4402.9kbits/s speed=1.01x    
    
frame=  204 fps= 25 q=3.4 size=    4404kB time=00:00:08.16 bitrate=4420.9kbits/s speed=1.01x    
    
frame=  217 fps= 25 q=2.0 size=    4592kB time=00:00:08.68 bitrate=4334.0kbits/s speed=1.01x    
    
frame=  230 fps= 25 q=2.0 size=    4657kB time=00:00:09.20 bitrate=4147.2kbits/s speed=1.01x    
    
frame=  242 fps= 25 q=2.0 size=    4736kB time=00:00:09.68 bitrate=4007.9kbits/s speed=1.01x    
    
frame=  255 fps= 25 q=2.0 size=    4830kB time=00:00:10.20 bitrate=3879.0kbits/s speed=1.01x    
    
frame=  267 fps= 25 q=2.0 size=    4953kB time=00:00:10.68 bitrate=3799.5kbits/s speed=1.01x    
    
frame=  280 fps= 25 q=2.0 size=    5093kB time=00:00:11.20 bitrate=3722.3kbits/s speed=1.01x    
    
frame=  291 fps= 25 q=2.0 Lsize=    5209kB time=00:00:11.68 bitrate=3650.9kbits/s speed=1.01x    
    
video:4998kB audio:183kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.542552%
    
Exiting normally, received signal 15.

    Pure command line for mp4 format :

    Input #0, mp3, from './stream_audio.mp3':
    
  Metadata:
    
    major_brand     : isom
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1mp41
    
    encoder         : Lavf57.41.100
    
  Duration: 00:00:29.59, start: 0.023021, bitrate: 128 kb/s
    
    Stream #0:0: Audio: mp3, 48000 Hz, stereo, s16p, 128 kb/s
    
    Metadata:
    
      encoder         : Lavc57.48
    
Input #1, rawvideo, from 'pipe:':
    
  Duration: N/A, start: 0.000000, bitrate: 552960 kb/s
    
    Stream #1:0: Video: rawvideo (RGB[24] / 0x18424752), rgb24, 1280x720, 552960 kb/s, 25 tbr, 25 tbn, 25 tbc
    
[libx264 @ 0x75fc583aa0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 AVX2 LZCNT BMI2
    
[libx264 @ 0x75fc583aa0] profile High, level 3.1
    
[libx264 @ 0x75fc583aa0] 264 - core 148 r2708 86b7198 - H.264/MPEG-4 AVC codec - Copyleft 2003-2016 - 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=6 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
    
[mp4 @ 0x75fc581280] Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead.
    
    Last message repeated 1 times
    
Output #0, mp4, to 'out.mp4':
    
  Metadata:
    
    major_brand     : isom
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1mp41
    
    encoder         : Lavf57.41.100
    
    Stream #0:0: Audio: aac (LC) ([64][0][0][0] / 0x0040), 48000 Hz, stereo, fltp, 128 kb/s
    
    Metadata:
    
      encoder         : Lavc57.48.101 aac
    
    Stream #0:1: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 1280x720, q=-1--1, 25 fps, 12800 tbn, 25 tbc
    
    Metadata:
    
      encoder         : Lavc57.48.101 libx264
    
    Side data:
    
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (mp3 (native) -> aac (native))
    
  Stream #1:0 -> #0:1 (rawvideo (native) -> h264 (libx264))
    
[rawvideo @ 0x75fc55d840] Thread message queue blocking; consider raising the thread_queue_size option (current value: 8)
    
frame=   14 fps=0.0 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
    
frame=   27 fps= 27 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
    
frame=   39 fps= 26 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
    
frame=   52 fps= 26 q=28.0 size=     113kB time=00:00:00.00 bitrate=N/A speed=   0x    
    
frame=   65 fps= 26 q=28.0 size=     188kB time=00:00:00.48 bitrate=3209.4kbits/s speed=0.191x    
    
frame=   77 fps= 26 q=28.0 size=     320kB time=00:00:01.00 bitrate=2615.3kbits/s speed=0.332x    
    
frame=   90 fps= 26 q=28.0 size=     450kB time=00:00:01.51 bitrate=2431.3kbits/s speed=0.43x    
    
frame=  102 fps= 25 q=28.0 size=     591kB time=00:00:01.98 bitrate=2442.1kbits/s speed=0.493x    
    
frame=  115 fps= 25 q=28.0 size=     731kB time=00:00:02.51 bitrate=2377.6kbits/s speed=0.556x    
    
frame=  128 fps= 25 q=28.0 size=     845kB time=00:00:03.00 bitrate=2307.7kbits/s speed=0.596x    
    
frame=  140 fps= 25 q=28.0 size=     930kB time=00:00:03.52 bitrate=2164.6kbits/s speed=0.636x    
    
frame=  153 fps= 25 q=28.0 size=     983kB time=00:00:04.03 bitrate=1996.7kbits/s speed=0.668x    
    
frame=  165 fps= 25 q=28.0 size=    1063kB time=00:00:04.52 bitrate=1925.2kbits/s speed=0.691x    
    
frame=  178 fps= 25 q=28.0 size=    1122kB time=00:00:05.03 bitrate=1826.2kbits/s speed=0.714x    
    
frame=  191 fps= 25 q=28.0 size=    1203kB time=00:00:05.52 bitrate=1783.6kbits/s speed=0.732x    
    
frame=  203 fps= 25 q=28.0 size=    1270kB time=00:00:06.03 bitrate=1723.7kbits/s speed=0.749x    
    
frame=  216 fps= 25 q=28.0 size=    1339kB time=00:00:06.52 bitrate=1680.5kbits/s speed=0.763x    
    
frame=  228 fps= 25 q=28.0 size=    1443kB time=00:00:07.06 bitrate=1674.1kbits/s speed=0.779x    
    
frame=  241 fps= 25 q=28.0 size=    1558kB time=00:00:07.55 bitrate=1690.0kbits/s speed=0.789x    
    
frame=  254 fps= 25 q=28.0 size=    1654kB time=00:00:08.04 bitrate=1685.0kbits/s speed=0.799x    
    
frame=  266 fps= 25 q=28.0 size=    1738kB time=00:00:08.55 bitrate=1664.6kbits/s speed=0.809x    
    
frame=  279 fps= 25 q=28.0 size=    1750kB time=00:00:09.06 bitrate=1581.2kbits/s speed=0.818x    
    
frame=  291 fps= 25 q=28.0 size=    1765kB time=00:00:09.55 bitrate=1512.7kbits/s speed=0.825x    
    
frame=  300 fps= 25 q=28.0 size=    1779kB time=00:00:11.73 bitrate=1242.1kbits/s speed=0.971x    
    
frame=  300 fps= 24 q=-1.0 Lsize=    1917kB time=00:00:12.01 bitrate=1307.2kbits/s speed=0.955x    
    
video:1720kB audio:188kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.488004%
    
[aac @ 0x75fc582520] Qavg: 221.585
    
[libx264 @ 0x75fc583aa0] frame I:2     Avg QP:15.83  size: 78710
    
[libx264 @ 0x75fc583aa0] frame P:185   Avg QP:21.02  size:  7259
    
[libx264 @ 0x75fc583aa0] frame B:113   Avg QP:26.59  size:  2298
    
[libx264 @ 0x75fc583aa0] consecutive B-frames: 46.3% 10.0%  1.0% 42.7%
    
[libx264 @ 0x75fc583aa0] mb I  I16..4: 22.1% 32.5% 45.4%
    
[libx264 @ 0x75fc583aa0] mb P  I16..4:  0.8%  1.4%  0.2%  P16..4: 25.2%  6.3%  3.1%  0.0%  0.0%    skip:63.0%
    
[libx264 @ 0x75fc583aa0] mb B  I16..4:  0.1%  0.2%  0.0%  B16..8: 37.3%  1.6%  0.2%  direct: 0.4%  skip:60.2%  L0:47.3% L1:49.6% BI: 3.0%
    
[libx264 @ 0x75fc583aa0] 8x8 transform intra:50.5% inter:58.1%
    
[libx264 @ 0x75fc583aa0] coded y,uvDC,uvAC intra: 49.4% 65.2% 22.9% inter: 7.7% 10.0% 0.5%
    
[libx264 @ 0x75fc583aa0] i16 v,h,dc,p: 29% 32% 11% 28%
    
[libx264 @ 0x75fc583aa0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 26% 21% 23%  4%  5%  6%  5%  5%  5%
    
[libx264 @ 0x75fc583aa0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 23% 15% 11%  8%  8%  9%  7% 12%  7%
    
[libx264 @ 0x75fc583aa0] i8c dc,h,v,p: 51% 20% 21%  8%
    
[libx264 @ 0x75fc583aa0] Weighted P-Frames: Y:0.0% UV:0.0%
    
[libx264 @ 0x75fc583aa0] ref P L0: 79.7% 11.4%  7.7%  1.2%
    
[libx264 @ 0x75fc583aa0] ref B L0: 96.8%  2.9%  0.4%
    
[libx264 @ 0x75fc583aa0] ref B L1: 97.7%  2.3%
    
[libx264 @ 0x75fc583aa0] kb/s:1173.39

  • Moov atom in android MeidaRecorder recorded data

    11 mars 2013, par mmmaaak

    I have a problem :

    I record data from camera using MediaRecorder in my Android app. I save it in socket, not in file. This data's length may be different. At the other side of socket connection, I save it in file. Connection may be interrupted at any unexpected moment. So after android socket disconnection I try to decode received data using ffmpeg. But as I understood, it cant find moov atom in this file. I've read some info about moov, so I think that MediaRecorder puts moov atom in the end of file. But if recording was interrupted, writing moov atom was skipped.

    I also have read that for data with unknown length (progressive loading, streaming) it is possible to write moov atom at the begining of the file.

    How to write my own moov data into the stream ? May I use MediaRecorder for this ? Or it is neccessary to do it manualy ? How to generate valid moov data ? If anybody has already solved this problem, please give me advice..

  • ffmpeg - Extract Video filesize from virtual data

    18 décembre 2015, par Youssef El Gharbaoui

    I am trying to calculate a video filesize from its data using FFMPEG.

    Assuming that I have the following data in my disposal :

    • vcodec => mp4a.40.2
    • acodec => avc1.64001F
    • format_note => hd720
    • height => 720
    • width => 1280
    • ext => mp4
    • duration => 56 (seconds)

    Questions :

    1. Is there any mathematical formula that can extract the video
      filesize using the data above
    2. Is it possible to simulate and extract the filesize of a
      non-existing file using the data above
    3. If FFMPEG cannot accomplish what Im asking, what do you suggest ?

    Please let me know if you need any additional information.

    Thanks for your help.

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