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  • ffmpeg command for faster encoding at a decent bitrate with smaller file size

    14 septembre 2016, par Blair Holmes

    I’m currently using an implementation of ffmpeg on my android app. I’m allowing users to take short videos within my app and then when they upload them to the server, I’m crunching them down with ffmpeg to decrease file size so they’re not passing huge amounts of data over the wire.

    the problem is, it’s taking forever to encode the videos on the android device. These videos usually aren’t longer than 45 seconds and can take 20 minutes to encode. I’ve done some playing around with different switches / parameters on the ffmpeg command line and I now have it at a more comfortable time, but the file sizes are significantly bigger. I’m just not sure what codec I should use (fastest encoding but with decent quality output), how ffmpeg handles changing size (aspect ratio) in terms of speed of encoding etc.

    Here are the two commands I’ve been using. This first one outputs the file size / quality that I want, but it just takes way too long to encode, not to mention it makes my device get really hot while it’s encoding for so long :

    ffmpeg -i input.mp4 -b:v 1024k -c:a copy -vf scale=960:540 output.mp4

    I’ve tweaked the bitrate some on that as well as changed the scale to a smaller size, but I don’t want to have to make the videos really small (in terms of scale) to accomplish a faster encoding. this second command goes a lot faster but makes the file size significantly bigger :

    ffmpeg -i input.mp4 -vcodec libx264 -preset fast -c:a copy -s 960x540 output.mp4

    I’d like to find a happy medium (smaller file size but faster encoding) keeping the video scale size close to the original. ffmpeg just has so many different parameters / switches that it’s difficult to wrap my head around what I should be doing.

    EDIT : adding ffmpeg output.

    ffmpeg -i input.mp4 -vcodec libx264 -crf 30 -preset veryfast -c:a copy -s 960x540 output.mp4

        09-13 11:06:28.330 10881-10881/someapp D/home: ffmpeg version n3.0.1 Copyright (c) 2000-2016 the FFmpeg developers
    
09-13 11:06:28.330 10881-10881/someapp D/home:   built with gcc 4.8 (GCC)
    
09-13 11:06:28.331 10881-10881/someapp D/home:   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=
    
09-13 11:06:28.331 10881-10881/someapp D/home:   libavutil      55. 17.103 / 55. 17.103
    
09-13 11:06:28.331 10881-10881/someapp D/home:   libavcodec     57. 24.102 / 57. 24.102
    
09-13 11:06:28.331 10881-10881/someapp D/home:   libavformat    57. 25.100 / 57. 25.100
    
09-13 11:06:28.331 10881-10881/someapp D/home:   libavdevice    57.  0.101 / 57.  0.101
    
09-13 11:06:28.331 10881-10881/someapp D/home:   libavfilter     6. 31.100 /  6. 31.100
    
09-13 11:06:28.331 10881-10881/someapp D/home:   libswscale      4.  0.100 /  4.  0.100
    
09-13 11:06:28.331 10881-10881/someapp D/home:   libswresample   2.  0.101 /  2.  0.101
    
09-13 11:06:28.331 10881-10881/someapp D/home:   libpostproc    54.  0.100 / 54.  0.100
    
09-13 11:06:28.430 10881-10881/someapp D/home: Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/storage/emulated/0/ExpeditionSpot/Videos/20160913110411.mp4':
    
09-13 11:06:28.430 10881-10881/someapp D/home:   Metadata:
    
09-13 11:06:28.430 10881-10881/someapp D/home:     major_brand     : mp42
    
09-13 11:06:28.430 10881-10881/someapp D/home:     minor_version   : 0
    
09-13 11:06:28.430 10881-10881/someapp D/home:     compatible_brands: isommp42
    
09-13 11:06:28.430 10881-10881/someapp D/home:     creation_time   : 2016-09-13 17:04:33
    
09-13 11:06:28.430 10881-10881/someapp D/home:     com.android.version: 6.0.1
    
09-13 11:06:28.430 10881-10881/someapp D/home:   Duration: 00:00:19.41, start: 0.000000, bitrate: 20222 kb/s
    
09-13 11:06:28.430 10881-10881/someapp D/home:     Stream #0:0(eng): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p, 1920x1080, 19963 kb/s, SAR 1:1 DAR 16:9, 30.03 fps, 30 tbr, 90k tbn, 180k tbc (default)
    
09-13 11:06:28.430 10881-10881/someapp D/home:     Metadata:
    
09-13 11:06:28.430 10881-10881/someapp D/home:       creation_time   : 2016-09-13 17:04:33
    
09-13 11:06:28.430 10881-10881/someapp D/home:       handler_name    : VideoHandle
    
09-13 11:06:28.431 10881-10881/someapp D/home:     Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 96 kb/s (default)
    
09-13 11:06:28.431 10881-10881/someapp D/home:     Metadata:
    
09-13 11:06:28.431 10881-10881/someapp D/home:       creation_time   : 2016-09-13 17:04:33
    
09-13 11:06:28.431 10881-10881/someapp D/home:       handler_name    : SoundHandle
    
09-13 11:06:28.448 10881-10881/someapp D/home: [libx264 @ 0xf71c4400] using SAR=1/1
    
09-13 11:06:28.448 10881-10881/someapp D/home: [libx264 @ 0xf71c4400] using cpu capabilities: none!
    
09-13 11:06:28.516 10881-10881/someapp D/home: [libx264 @ 0xf71c4400] profile High, level 3.1
    
09-13 11:06:28.516 10881-10881/someapp D/home: [libx264 @ 0xf71c4400] 264 - core 148 - H.264/MPEG-4 AVC codec - Copyleft 2003-2015 - http://www.videolan.org/x264.html - options: cabac=1 ref=1 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=2 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=12 lookahead_threads=4 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=10 rc=crf mbtree=1 crf=27.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
    
09-13 11:06:28.532 10881-10881/someapp D/home: Output #0, mp4, to '/storage/emulated/0/ExpeditionSpot/.tmp/small-20160913110411.mp4':
    
09-13 11:06:28.532 10881-10881/someapp D/home:   Metadata:
    
09-13 11:06:28.532 10881-10881/someapp D/home:     major_brand     : mp42
    
09-13 11:06:28.533 10881-10881/someapp D/home:     minor_version   : 0
    
09-13 11:06:28.533 10881-10881/someapp D/home:     compatible_brands: isommp42
    
09-13 11:06:28.533 10881-10881/someapp D/home:     com.android.version: 6.0.1
    
09-13 11:06:28.533 10881-10881/someapp D/home:     encoder         : Lavf57.25.100
    
09-13 11:06:28.533 10881-10881/someapp D/home:     Stream #0:0(eng): Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 960x540 [SAR 1:1 DAR 16:9], q=-1--1, 30 fps, 15360 tbn, 30 tbc (default)
    
09-13 11:06:28.533 10881-10881/someapp D/home:     Metadata:
    
09-13 11:06:28.533 10881-10881/someapp D/home:       creation_time   : 2016-09-13 17:04:33
    
09-13 11:06:28.533 10881-10881/someapp D/home:       handler_name    : VideoHandle
    
09-13 11:06:28.533 10881-10881/someapp D/home:       encoder         : Lavc57.24.102 libx264
    
09-13 11:06:28.533 10881-10881/someapp D/home:     Side data:
    
09-13 11:06:28.533 10881-10881/someapp D/home:       unknown side data type 10 (24 bytes)
    
09-13 11:06:28.533 10881-10881/someapp D/home:     Stream #0:1(eng): Audio: aac (LC) ([64][0][0][0] / 0x0040), 48000 Hz, stereo, 96 kb/s (default)
    
09-13 11:06:28.533 10881-10881/someapp D/home:     Metadata:
    
09-13 11:06:28.533 10881-10881/someapp D/home:       creation_time   : 2016-09-13 17:04:33
    
09-13 11:06:28.533 10881-10881/someapp D/home:       handler_name    : SoundHandle
    
09-13 11:06:28.533 10881-10881/someapp D/home: Stream mapping:
    
09-13 11:06:28.533 10881-10881/someapp D/home:   Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
    
09-13 11:06:28.533 10881-10881/someapp D/home:   Stream #0:1 -> #0:1 (copy)
    
09-13 11:06:28.533 10881-10881/someapp D/home: Press [q] to stop, [?] for help
    
09-13 11:06:29.102 10881-10881/someapp D/home: frame=    7 fps=0.0 q=0.0 size=       0kB time=00:00:01.04 bitrate=   0.4kbits/s speed=2.08x    
    
09-13 11:06:29.699 10881-10881/someapp D/home: frame=   16 fps= 15 q=0.0 size=       0kB time=00:00:01.04 bitrate=   0.4kbits/s speed=0.998x    
    
....
    
09-13 11:07:12.674 10881-10881/someapp D/home: [libx264 @ 0xf71c4400] frame I:3     Avg QP:26.83  size: 21896
    
09-13 11:07:12.674 10881-10881/someapp D/home: [libx264 @ 0xf71c4400] frame P:279   Avg QP:28.76  size:  5859
    
09-13 11:07:12.674 10881-10881/someapp D/home: [libx264 @ 0xf71c4400] frame B:296   Avg QP:29.93  size:   863
    
09-13 11:07:12.674 10881-10881/someapp D/home: [libx264 @ 0xf71c4400] consecutive B-frames: 18.3% 32.2% 23.9% 25.6%
    
09-13 11:07:12.674 10881-10881/someapp D/home: [libx264 @ 0xf71c4400] mb I  I16..4: 16.9% 54.2% 28.9%
    
09-13 11:07:12.674 10881-10881/someapp D/home: [libx264 @ 0xf71c4400] mb P  I16..4:  7.7%  9.1%  0.4%  P16..4: 27.5% 11.1%  4.0%  0.0%  0.0%    skip:40.1%
    
09-13 11:07:12.674 10881-10881/someapp D/home: [libx264 @ 0xf71c4400] mb B  I16..4:  0.8%  0.6%  0.0%  B16..8: 10.9%  2.4%  0.1%  direct: 1.8%  skip:83.5%  L0:35.8% L1:54.2% BI:10.0%
    
09-13 11:07:12.675 10881-10881/someapp D/home: [libx264 @ 0xf71c4400] 8x8 transform intra:52.0% inter:41.3%
    
09-13 11:07:12.675 10881-10881/someapp D/home: [libx264 @ 0xf71c4400] coded y,uvDC,uvAC intra: 28.9% 26.0% 2.1% inter: 6.4% 5.0% 0.0%
    
09-13 11:07:12.675 10881-10881/someapp D/home: [libx264 @ 0xf71c4400] i16 v,h,dc,p: 57% 20% 17%  6%
    
09-13 11:07:12.675 10881-10881/someapp D/home: [libx264 @ 0xf71c4400] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 33% 23% 34%  1%  2%  1%  3%  2%  2%
    
09-13 11:07:12.675 10881-10881/someapp D/home: [libx264 @ 0xf71c4400] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 36% 21% 17%  2%  7%  4%  6%  4%  4%
    
09-13 11:07:12.675 10881-10881/someapp D/home: [libx264 @ 0xf71c4400] i8c dc,h,v,p: 59% 16% 23%  2%
    
09-13 11:07:12.675 10881-10881/someapp D/home: [libx264 @ 0xf71c4400] Weighted P-Frames: Y:16.8% UV:4.7%
    
09-13 11:07:12.675 10881-10881/someapp D/home: [libx264 @ 0xf71c4400] kb/s:812.09

  • Mixing two audio inputs together as fast as possible ffmpeg

    23 septembre 2016, par Jeremy

    Currently trying to mix two audio streams together to perform an overlay. (Vocals over Instruments). I have two M4A files and I want to combine them together. If the vocal track is 30 seconds, it takes roughly 32 seconds to mix them together, but was hoping for significantly faster processing.

    Here is the code I’m using

    -ss 0.300 -i /data/user/0/me.rapchat.rapchat/cache/recording.m4a -i /data/user/0/me.rapchat.rapchat/cache/beats/cc3613da-849b-47a5-97b1-b9bf3f1136db.m4a -filter_complex [0:a][1:a]amerge=inputs=2,pan=stereo|c0data/user/0/me.rapchat.rapchat/cache/rap.m4a

    I’ve read about using the preset Ultrafast but not sure how it would fit in as I’ve tried adding it and gotten errors about it’s placement in the command. I’ve also read about copying the stream "as is" and not worrying about encoding/decoding which I was curious if that would speed up the whole process.

    And here are my logs for a succesful mix

        09-23 15:08:08.412 13909-13909/me.rapchat.rapchat E/Studio Process: ffmpeg version n3.0.1 Copyright (c) 2000-2016 the FFmpeg developers
    
    09-23 15:08:08.412 13909-13909/me.rapchat.rapchat E/Studio Process:   built with gcc 4.8 (GCC)
    
    09-23 15:08:08.412 13909-13909/me.rapchat.rapchat E/Studio Process:   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=
    
    09-23 15:08:08.412 13909-13909/me.rapchat.rapchat E/Studio Process:   libavutil      55. 17.103 / 55. 17.103
    
    09-23 15:08:08.412 13909-13909/me.rapchat.rapchat E/Studio Process:   libavcodec     57. 24.102 / 57. 24.102
    
    09-23 15:08:08.412 13909-13909/me.rapchat.rapchat E/Studio Process:   libavformat    57. 25.100 / 57. 25.100
    
    09-23 15:08:08.412 13909-13909/me.rapchat.rapchat E/Studio Process:   libavdevice    57.  0.101 / 57.  0.101
    
    09-23 15:08:08.412 13909-13909/me.rapchat.rapchat E/Studio Process:   libavfilter     6. 31.100 /  6. 31.100
    
    09-23 15:08:08.412 13909-13909/me.rapchat.rapchat E/Studio Process:   libswscale      4.  0.100 /  4.  0.100
    
    09-23 15:08:08.412 13909-13909/me.rapchat.rapchat E/Studio Process:   libswresample   2.  0.101 /  2.  0.101
    
    09-23 15:08:08.412 13909-13909/me.rapchat.rapchat E/Studio Process:   libpostproc    54.  0.100 / 54.  0.100
    
    09-23 15:08:08.442 13909-13909/me.rapchat.rapchat E/Studio Process: Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/data/user/0/me.rapchat.rapchat/cache/recording.m4a':
    
    09-23 15:08:08.442 13909-13909/me.rapchat.rapchat E/Studio Process:   Metadata:
    
    09-23 15:08:08.442 13909-13909/me.rapchat.rapchat E/Studio Process:     major_brand     : mp42
    
    09-23 15:08:08.452 13909-13909/me.rapchat.rapchat E/Studio Process:     minor_version   : 0
    
    09-23 15:08:08.452 13909-13909/me.rapchat.rapchat E/Studio Process:     compatible_brands: isommp42
    
    09-23 15:08:08.452 13909-13909/me.rapchat.rapchat E/Studio Process:     creation_time   : 2016-09-23 20:08:08
    
    09-23 15:08:08.452 13909-13909/me.rapchat.rapchat E/Studio Process:     com.android.version: 6.0.1
    
    09-23 15:08:08.452 13909-13909/me.rapchat.rapchat E/Studio Process:   Duration: 00:00:34.74, start: 0.000000, bitrate: 64 kb/s
    
    09-23 15:08:08.452 13909-13909/me.rapchat.rapchat E/Studio Process:     Stream #0:0(eng): Audio: aac (HE-AAC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 64 kb/s (default)
    
    09-23 15:08:08.452 13909-13909/me.rapchat.rapchat E/Studio Process:     Metadata:
    
    09-23 15:08:08.452 13909-13909/me.rapchat.rapchat E/Studio Process:       creation_time   : 2016-09-23 20:08:08
    
    09-23 15:08:08.452 13909-13909/me.rapchat.rapchat E/Studio Process:       handler_name    : SoundHandle
    
    09-23 15:08:08.452 13909-13909/me.rapchat.rapchat E/Studio Process: Input #1, mov,mp4,m4a,3gp,3g2,mj2, from '/data/user/0/me.rapchat.rapchat/cache/beats/cc3613da-849b-47a5-97b1-b9bf3f1136db.m4a':
    
    09-23 15:08:08.452 13909-13909/me.rapchat.rapchat E/Studio Process:   Metadata:
    
    09-23 15:08:08.452 13909-13909/me.rapchat.rapchat E/Studio Process:     major_brand     : M4A 
    
    09-23 15:08:08.452 13909-13909/me.rapchat.rapchat E/Studio Process:     minor_version   : 0
    
    09-23 15:08:08.452 13909-13909/me.rapchat.rapchat E/Studio Process:     compatible_brands: M4A mp42isom
    
    09-23 15:08:08.452 13909-13909/me.rapchat.rapchat E/Studio Process:     creation_time   : 2016-06-21 20:00:19
    
    09-23 15:08:08.452 13909-13909/me.rapchat.rapchat E/Studio Process:     artist          : 
    
    09-23 15:08:08.452 13909-13909/me.rapchat.rapchat E/Studio Process:     album           : Rapchat
    
    09-23 15:08:08.452 13909-13909/me.rapchat.rapchat E/Studio Process:     date            : 2016
    
    09-23 15:08:08.452 13909-13909/me.rapchat.rapchat E/Studio Process:     composer        : 
    
    09-23 15:08:08.452 13909-13909/me.rapchat.rapchat E/Studio Process:     title           : wrist - beat
    
    09-23 15:08:08.452 13909-13909/me.rapchat.rapchat E/Studio Process:     encoder         : 10.2.0
    
    09-23 15:08:08.452 13909-13909/me.rapchat.rapchat E/Studio Process:     iTunSMPB        :  00000000 00000840 000003BF 00000000004A0001 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
    
    09-23 15:08:08.452 13909-13909/me.rapchat.rapchat E/Studio Process:   Duration: 00:01:50.04, start: 0.000000, bitrate: 110 kb/s
    
    09-23 15:08:08.452 13909-13909/me.rapchat.rapchat E/Studio Process:     Stream #1:0(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 259 kb/s (default)
    
    09-23 15:08:08.452 13909-13909/me.rapchat.rapchat E/Studio Process:     Metadata:
    
    09-23 15:08:08.452 13909-13909/me.rapchat.rapchat E/Studio Process:       creation_time   : 2016-06-21 20:00:19
    
    09-23 15:08:08.452 13909-13909/me.rapchat.rapchat E/Studio Process: [Parsed_amerge_0 @ 0xf6f57140] No channel layout for input 1
    
    09-23 15:08:08.452 13909-13909/me.rapchat.rapchat E/Studio Process: [Parsed_amerge_0 @ 0xf6f57140] Input channel layouts overlap: output layout will be determined by the number of distinct input channels
    
    09-23 15:08:08.472 13909-13909/me.rapchat.rapchat E/Studio Process: Output #0, ipod, to '/data/user/0/me.rapchat.rapchat/cache/rap.m4a':
    
    09-23 15:08:08.472 13909-13909/me.rapchat.rapchat E/Studio Process:   Metadata:
    
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    09-23 15:08:08.482 13909-13909/me.rapchat.rapchat E/Studio Process:     minor_version   : 0
    
    09-23 15:08:08.482 13909-13909/me.rapchat.rapchat E/Studio Process:     compatible_brands: isommp42
    
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    09-23 15:08:08.482 13909-13909/me.rapchat.rapchat E/Studio Process:     encoder         : Lavf57.25.100
    
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    09-23 15:08:08.482 13909-13909/me.rapchat.rapchat E/Studio Process:     Metadata:
    
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    09-23 15:08:47.722 13909-13909/me.rapchat.rapchat E/Studio Process: video:0kB audio:541kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.207577%
    
    09-23 15:08:47.722 13909-13909/me.rapchat.rapchat E/Studio Process: [aac @ 0xf6f43400] Qavg: 12320.994

    The problem is that there is some time delay on this and i’m not sure how to go about optimizing this. I’m pretty new to FFMPEG and the syntax has quite the learning curve when throwing in presets, and codecs. Will the preset ultrafast be what i’m looking for, and how do I add it to this ?

    Thank you in advance !

  • How do I compile a 64-bit version of ffmpeg on Windows ?

    30 septembre 2016, par lyxera

    i need to compile ffmpeg (64 bit shared dll) for windows.
    however I configure in mingw, it always produces 32 bit binary for me.

    tried this already

    ./configure --enable-shared --disable-static --enable-memalign-hack --arch=amd64
    
./configure --enable-shared --disable-static --enable-memalign-hack --arch=x86_64

    my guess is that a x86 to x86_64 cross compiler is missing.

    but just can find a way to make those 64bit dlls.

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