[FFmpeg-user] High memory usage when merging videos

Jonathan Girven jonathan.girven at trickbook.com
Tue Dec 6 13:24:23 EET 2016

I use FFmpeg in my Android app to merge videos together. I have
compiled an executable file that is run using ProcessBuilder. I am
finding that with my recent FFmpeg build (updated FFmpeg and libraries
to git master from a 2015 build[1]) the FFmpeg process is now being
killed by Android for high memory usage. Is there some way I can log
where the memory is being used by FFmpeg? E.g. the frames are being
loaded into memory much faster than X complex filter can process them?

ffmpeg -y -i new_504c08fa-6c0c-40e3-a59c-93a37d73d364.mp4 -i
new_921ff756-bfd9-4ac0-b2fc-15c4d6a46c3d.mp4 -i video_stamp_720.png -f
lavfi -i color=black:s=1280x720 -filter_complex
-vcodec libx264 -preset faster -map [over3] -map [audio_vol] -c:a
libfdk_aac -ac 2 -b:a 128k -strict -2
ffmpeg version N-82612-g81147b5 Copyright (c) 2000-2016 the FFmpeg developers
  built with gcc 4.9 (GCC) 20140827 (prerelease)
  configuration: --target-os=linux
--enable-cross-compile --arch=arm
--disable-shared --enable-static
-O3 -fPIE -pie -mfloat-abi=softfp -mfpu=vfpv3-d16 -marm -march=armv7-a
' --extra-ldflags='-L/home/jon/workspace/writing-minds-ffmpeg-android/ffmpeg-build/armeabi-v7a/lib
-fPIE -pie' --enable-gpl --enable-libfdk-aac --enable-libx264
--enable-jni --enable-mediacodec --enable-nonfree --enable-pic
--enable-version3 --enable-zlib --disable-debug --disable-doc
--disable-ffplay --disable-ffprobe --disable-ffserver
--disable-outdevs --disable-decoders
  libavutil      55. 41.101 / 55. 41.101
  libavcodec     57. 66.107 / 57. 66.107
  libavformat    57. 58.100 / 57. 58.100
  libavdevice    57.  2.100 / 57.  2.100
  libavfilter     6. 67.100 /  6. 67.100
  libswscale      4.  3.101 /  4.  3.101
  libswresample   2.  4.100 /  2.  4.100
  libpostproc    54.  2.100 / 54.  2.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf57.58.100
  Duration: 00:00:14.62, start: 0.000000, bitrate: 1040 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p,
1280x720 [SAR 1:1 DAR 16:9], 891 kb/s, 29.97 fps, 29.97 tbr, 30k tbn,
59.94 tbc (default)
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz,
stereo, fltp, 139 kb/s (default)
      handler_name    : SoundHandler
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf57.58.100
  Duration: 00:00:04.64, start: 0.000000, bitrate: 932 kb/s
    Stream #1:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p,
1280x720 [SAR 1:1 DAR 16:9], 778 kb/s, 59.94 fps, 59.94 tbr, 60k tbn,
119.88 tbc (default)
      handler_name    : VideoHandler
    Stream #1:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz,
stereo, fltp, 140 kb/s (default)
      handler_name    : SoundHandler
Input #2, image2, from 'video_stamp_720.png':
  Duration: 00:00:00.04, start: 0.000000, bitrate: 478 kb/s
    Stream #2:0: Video: png, pal8(pc), 1280x720, 25 tbr, 25 tbn, 25 tbc
Input #3, lavfi, from 'color=black:s=1280x720':
  Duration: N/A, start: 0.000000, bitrate: N/A
    Stream #3:0: Video: rawvideo (I420 / 0x30323449), yuv420p,
1280x720 [SAR 1:1 DAR 16:9], 25 tbr, 25 tbn, 25 tbc
[libx264 @ 0xb8b01f10] using SAR=1/1
[libx264 @ 0xb8b01f10] using cpu capabilities: ARMv6 NEON
[libx264 @ 0xb8b01f10] profile High, level 3.1
[libx264 @ 0xb8b01f10] 264 - core 148 - H.264/MPEG-4 AVC codec -
Copyleft 2003-2016 - http://www.videolan.org/x264.html - options:
cabac=1 ref=2 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=4 psy=1
psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=1
8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 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=3 b_pyramid=2
b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=1 keyint=250
keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=20 rc=crf
mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40
Output #0, mp4, to 'new_50a51bd8-9a96-4c6c-afb2-95a2e130de89.mp4':
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf57.58.100
    Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021),
yuv420p, 1280x720 [SAR 1:1 DAR 16:9], q=-1--1, 25 fps, 12800 tbn, 25
tbc (default)
      encoder         : Lavc57.66.107 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
    Stream #0:1: Audio: aac (libfdk_aac) ([64][0][0][0] / 0x0040),
44100 Hz, stereo, s16, 128 kb/s (default)
      encoder         : Lavc57.66.107 libfdk_aac
Stream mapping:
  Stream #0:0 (h264) -> trim
  Stream #0:1 (aac) -> atrim
  Stream #1:0 (h264) -> trim
  Stream #1:1 (aac) -> atrim
  Stream #2:0 (png) -> overlay:overlay
  Stream #3:0 (rawvideo) -> trim
  format -> Stream #0:0 (libx264)
  volume -> Stream #0:1 (libfdk_aac)
Press [q] to stop, [?] for help
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bitrate=1393.1kbits/s speed=0.183x
frame=  324 fps=4.6 q=28.0 size=    2195kB time=00:00:12.88
bitrate=1395.0kbits/s speed=0.183x
frame=  328 fps=4.6 q=28.0 size=    2215kB time=00:00:13.04
bitrate=1390.3kbits/s speed=0.184x
frame=  330 fps=4.6 q=28.0 size=    2232kB time=00:00:13.14
bitrate=1391.0kbits/s speed=0.184x
frame=  334 fps=4.6 q=28.0 size=    2257kB time=00:00:13.28
bitrate=1392.1kbits/s speed=0.183x
frame=  336 fps=4.6 q=28.0 size=    2267kB time=00:00:13.39
bitrate=1386.2kbits/s speed=0.184x
frame=  339 fps=4.6 q=28.0 size=    2290kB time=00:00:13.49
bitrate=1390.5kbits/s speed=0.184x
frame=  341 fps=4.6 q=28.0 size=    2304kB time=00:00:13.60
bitrate=1386.9kbits/s speed=0.184x
frame=  343 fps=4.6 q=28.0 size=    2314kB time=00:00:13.69
bitrate=1383.6kbits/s speed=0.184x
frame=  345 fps=4.6 q=28.0 size=    2328kB time=00:00:13.79
bitrate=1382.6kbits/s speed=0.184x
frame=  347 fps=4.6 q=28.0 size=    2335kB time=00:00:13.86
bitrate=1380.0kbits/s speed=0.183x
frame=  349 fps=4.6 q=28.0 size=    2349kB time=00:00:13.93
bitrate=1381.2kbits/s speed=0.183x
frame=  351 fps=4.6 q=28.0 size=    2357kB time=00:00:14.02
bitrate=1376.6kbits/s speed=0.183x
frame=  353 fps=4.6 q=28.0 size=    2366kB time=00:00:14.11
bitrate=1373.1kbits/s speed=0.183x
frame=  355 fps=4.6 q=28.0 size=    2379kB time=00:00:14.16
bitrate=1376.0kbits/s speed=0.182x
frame=  357 fps=4.6 q=28.0 size=    2395kB time=00:00:14.23
bitrate=1378.2kbits/s speed=0.182x
frame=  359 fps=4.6 q=28.0 size=    2414kB time=00:00:14.32
bitrate=1380.1kbits/s speed=0.182x
frame=  361 fps=4.6 q=28.0 size=    2424kB time=00:00:14.39
bitrate=1379.1kbits/s speed=0.182x
frame=  363 fps=4.5 q=28.0 size=    2443kB time=00:00:14.48
bitrate=1381.1kbits/s speed=0.182x
frame=  365 fps=4.5 q=28.0 size=    2455kB time=00:00:14.60
bitrate=1377.2kbits/s speed=0.182x
frame=  365 fps=4.5 q=28.0 size=    2455kB time=00:00:14.86
bitrate=1353.5kbits/s speed=0.184x
frame=  365 fps=4.5 q=28.0 size=    2455kB time=00:00:15.11
bitrate=1330.7kbits/s speed=0.186x
frame=  365 fps=4.5 q=28.0 size=    2455kB time=00:00:15.34
bitrate=1310.5kbits/s speed=0.187x
frame=  365 fps=4.4 q=28.0 size=    2455kB time=00:00:15.51
bitrate=1296.8kbits/s speed=0.188x
frame=  365 fps=4.4 q=28.0 size=    2455kB time=00:00:15.69
bitrate=1281.4kbits/s speed=0.189x
frame=  365 fps=4.4 q=28.0 size=    2455kB time=00:00:15.97
bitrate=1259.1kbits/s speed=0.192x
frame=  365 fps=4.3 q=28.0 size=    2455kB time=00:00:16.16
bitrate=1244.6kbits/s speed=0.193x
frame=  365 fps=4.3 q=28.0 size=    2455kB time=00:00:16.39
bitrate=1227.0kbits/s speed=0.194x
frame=  365 fps=4.3 q=28.0 size=    2455kB time=00:00:16.62
bitrate=1209.9kbits/s speed=0.196x
frame=  365 fps=4.3 q=28.0 size=    2455kB time=00:00:16.76
bitrate=1199.8kbits/s speed=0.196x
processComplete: 9

I understand that my FFmpeg command does some unnecessary filtering,
e.g. scale a 720p video to be 720p, but I didn't think this would be
the main cause (maybe I am wrong?). It is in there because the command
is automatically generated and is supposed to work with many input

Performing the same command as above (2 clips), except without fifo,
completed without an error on my test device (Albeit the second clip
freezes on an early frame). Doubling everything up to 4 clips, FFmpeg
is again killed due to high memory usage. So, some improvement.

I can see in dmesg, when the process is killed:

<4>[ 9706.743390,3] send sigkill to 26935 (ffmpeg), adj 0, size 114805

Apologies if you have already seen this on SuperUser and were unable
to help then.

[1]: http://superuser.com/questions/1148520/ffmpeg-crf-compression-slower-on-master-than-old-version

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