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  • Crossdevice encoding static file to stream in browser using FFMPEG (segmented h264 ?)

    20 mars 2014, par Vprnl

    I'm building a mediacenter application in NodeJS which is going pretty ok.
    (you can check it out on Github : https://github.com/jansmolders86/mediacenterjs )

    I'm using FFMPEG to transcode local (static) movies to a stream which I then send to the browser.

    At first I used h264 with Flash which worked in browsers, but I really need it to work on Android an iOS (so no Flash) and preferably working on a Raspberry Pi.

    But getting it to play on all devices is driving me absolutely insane !

    I have all these bits of the puzzle I've gathered from countless hours reading articles, tutorials and stack overflow posts, which led me to the conclusion that I need to produce the following :

    • Use video codec H264 to transcode to MP4
    • Move the moovatom '-movflags' to make a MP4 streamable
    • Segment the stream so Apple can play the stream as well.

    But getting nowhere with this. Every time I produce a series of FFMPEG settings that either don't work, or work on some devices rather than all.

    Some of my failed attempt where :

    My flash attempt -> Main problem (not running in IOS) :

        '-y','-ss 0','-b 800k','-vcodec libx264','-acodec mp3'\ 
    
    '-ab 128','-ar 44100','-bufsize 62000', '-maxrate 620k'\
    
    metaDuration,tDuration,'-f flv

    my HLS attempt -> Main problem (not running in browser) :

            '-r 15','-b:v 128k','-c:v libx264','-x264opts level=41'\
    
        '-threads 4','-s 640x480','-map 0:v','-map 0:a:0','-c:a mp3'\
    
        '-b:a 160000','-ac 2','-f hls','-hls_time 10','-hls_list_size 6'\
    
        '-hls_wrap 18','-start_number 1'

    My MP4 attempt -> Main problem (duration is shortened and the later part of the video is speeding by)

           '-y','-ss 0','-b 800k','-vcodec libx264','-acodec mp3'\
    
       '-ab 128','-ar 44100','-bufsize 62000', '-maxrate 620k'\
    
       metaDuration,tDuration,'-f mp4','-movflags','frag_keyframe+empty_moov'

    Second MP4 attempt : -> Main problem (duration is shortened and the later part of the video is speeding by)

        '-y','-vcodec libx264','-pix_fmt yuv420p','-b 1200k','-flags +loop+mv4'\
    
    '-cmp 256','-partitions +parti4x4+parti8x8+partp4x4+partp8x8+partb8x8'\
    
    '-me_method hex','-subq 7','-trellis 1','-refs 5','-bf 3','-coder 1'\
    
    '-me_range 16','-g 150','-keyint_min 25','-sc_threshold 40'\
    
    '-i_qfactor 0.71','-acodec mp3','-qmin 10','-qdiff 4','-qmax 51'\
    
    '-ab 128k','-ar 44100','-threads 2','-f mp4','-movflags','frag_keyframe+empty_moov'])

    Here is an example of the FFMPEG log running with these settings :

            file conversion error ffmpeg version N-52458-gaa96439 Copyright (c) 2000-2013 the FFmpeg developers
    
          built on Apr 24 2013 22:19:32 with gcc 4.8.0 (GCC)
    
          configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --e
    
        nable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable
    
        -libgsm --enable-libilbc --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --ena
    
        ble-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwola
    
        me --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enabl
    
        e-libxvid --enable-zlib
    
          libavutil      52. 27.101 / 52. 27.101
    
          libavcodec     55.  6.100 / 55.  6.100
    
          libavformat    55.  3.100 / 55.  3.100
    
          libavdevice    55.  0.100 / 55.  0.100
    
          libavfilter     3. 60.101 /  3. 60.101
    
          libswscale      2.  2.100 /  2.  2.100
    
          libswresample   0. 17.102 /  0. 17.102
    
          libpostproc    52.  3.100 / 52.  3.100
    
        [avi @ 02427900] non-interleaved AVI
    
        Guessed Channel Layout for  Input Stream #0.1 : mono
    
        Input #0, avi, from 'C:/temp/the avengers.avi':
    
          Duration: 00:00:34.00, start: 0.000000, bitrate: 1433 kb/s
    
            Stream #0:0: Video: cinepak (cvid / 0x64697663), rgb24, 320x240, 15 tbr, 15 tbn, 15 tbc
    
            Stream #0:1: Audio: pcm_u8 ([1][0][0][0] / 0x0001), 22050 Hz, mono, u8, 176 kb/s
    
        Please use -b:a or -b:v, -b is ambiguous
    
        [libx264 @ 02527c60] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
    
        [libx264 @ 02527c60] profile High, level 2.0
    
        [libx264 @ 02527c60] 264 - core 130 r2274 c832fe9 - H.264/MPEG-4 AVC codec - Copyleft 2003-2013 - http://www.videolan.org/x26
    
        4.html - options: cabac=1 ref=5 deblock=1:0:0 analyse=0x3:0x133 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=2 lookahead_threads=1 sliced_th
    
        reads=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 we
    
        ightb=1 open_gop=0 weightp=2 keyint=150 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=abr mbtree=1 bitrate=120
    
        0 ratetol=1.0 qcomp=0.60 qpmin=10 qpmax=51 qpstep=4 ip_ratio=1.41 aq=1:1.00
    
        Output #0, mp4, to 'pipe:1':
    
          Metadata:
    
            encoder         : Lavf55.3.100
    
            Stream #0:0: Video: h264 ([33][0][0][0] / 0x0021), yuv420p, 320x240, q=10-51, 1200 kb/s, 15360 tbn, 15 tbc
    
            Stream #0:1: Audio: mp3 (i[0][0][0] / 0x0069), 44100 Hz, mono, s16p, 128 kb/s
    
        Stream mapping:
    
          Stream #0:0 -> #0:0 (cinepak -> libx264)
    
          Stream #0:1 -> #0:1 (pcm_u8 -> libmp3lame)
    
        Press [q] to stop, [?] for help
    
        frame=  106 fps=0.0 q=10.0 size=       1kB time=00:00:06.94 bitrate=   1.4kbits/s
    
        frame=  150 fps=149 q=14.0 size=       1kB time=00:00:09.87 bitrate=   1.0kbits/s
    
        frame=  191 fps=126 q=16.0 size=       1kB time=00:00:12.61 bitrate=   0.8kbits/s
    
        frame=  244 fps=121 q=16.0 size=    2262kB time=00:00:16.14 bitrate=1147.6kbits/s
    
        frame=  303 fps=120 q=14.0 size=    2262kB time=00:00:20.08 bitrate= 922.2kbits/s
    
        frame=  354 fps=117 q=15.0 size=    3035kB time=00:00:23.48 bitrate=1058.6kbits/s
    
        frame=  402 fps=113 q=15.0 size=    3035kB time=00:00:26.67 bitrate= 932.1kbits/s
    
        frame=  459 fps=113 q=16.0 size=    4041kB time=00:00:30.43 bitrate=1087.7kbits/s
    
        frame=  510 fps=103 q=2686559.0 Lsize=    5755kB time=00:00:33.93 bitrate=1389.3kbits/s
    

    
        video:5211kB audio:531kB subtitle:0 global headers:0kB muxing overhead 0.235111%
    
        [libx264 @ 02527c60] frame I:6     Avg QP:10.55  size: 25921
    
        [libx264 @ 02527c60] frame P:245   Avg QP:12.15  size: 14543
    
        [libx264 @ 02527c60] frame B:259   Avg QP:15.55  size:  6242
    
        [libx264 @ 02527c60] consecutive B-frames:  6.1% 73.7% 14.7%  5.5%
    
        [libx264 @ 02527c60] mb I  I16..4: 19.9%  6.2% 73.9%
    
        [libx264 @ 02527c60] mb P  I16..4:  6.0%  0.2% 12.0%  P16..4: 35.4%  9.6% 16.3%  7.0%  5.6%    skip: 7.8%
    
        [libx264 @ 02527c60] mb B  I16..4:  0.7%  0.0%  4.3%  B16..8: 27.6% 17.2% 17.0%  direct:17.3%  skip:15.9%  L0:39.4% L1:43.2%
    
        BI:17.4%
    
        [libx264 @ 02527c60] final ratefactor: 11.41
    
        [libx264 @ 02527c60] 8x8 transform intra:1.6% inter:4.0%
    
        [libx264 @ 02527c60] coded y,uvDC,uvAC intra: 93.0% 97.0% 94.9% inter: 58.4% 58.7% 50.6%
    
        [libx264 @ 02527c60] i16 v,h,dc,p: 15% 26% 54%  5%
    
        [libx264 @ 02527c60] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 16% 17% 39%  4%  4%  3%  1%  6%  9%
    
        [libx264 @ 02527c60] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 28% 34% 21%  4%  2%  2%  2%  2%  5%
    
        [libx264 @ 02527c60] i8c dc,h,v,p: 51% 24% 19%  6%
    
        [libx264 @ 02527c60] Weighted P-Frames: Y:4.1% UV:1.2%
    
        [libx264 @ 02527c60] ref P L0: 68.2%  9.8% 11.0%  5.6%  4.6%  0.8%  0.0%
    
        [libx264 @ 02527c60] ref B L0: 87.7%  8.0%  3.9%  0.4%
    
        [libx264 @ 02527c60] ref B L1: 97.8%  2.2%
    
        [libx264 @ 02527c60] kb/s:1255.36

    Lastly this is my node code fireing up FFMPEG. (I use the module Fluent-ffmpeg : https://github.com/schaermu/node-fluent-ffmpeg )

        var proc = new ffmpeg({ source: movie, nolog: true, timeout:15000})                         
    
        .addOptions(['-r 15','-b:v 128k','-c:v libx264','-x264opts level=41','-threads 4','-s 640x480','-map 0:v','-map 0:a:0','-c:a mp3','-b:a 160000','-ac 2','-f hls','-hls_time 10','-hls_list_size 6','-hls_wrap 18','-start_number 1 stream.m3u8'])
    
        .writeToStream(res, function(retcode, error){
    
            if (!error){
    
                console.log('file has been converted succesfully',retcode .green);
    
            }else{
    
                console.log('file conversion error',error .red);
    
            }
    
        });

    So to conclude this very long and code heavy question :

    I hope this does not come off as a lazy request, but could someone show/explain to me which FFMPEG settings could/should work on all platforms (modern browsers, Android and iOS) producing a stream of a static file which I can send to a HTML5 player.

    [EDIT] what I need if a generic option isn't available

    And if this is not possible as some posts might suggest, I would love to see a set of FFMPEG settings that get's the job done properly as far as mp4 streaming is concerned. (e.g encoding a streamable mp4).

    The streaming mp4 needs the following

    • A shifted moovAtom
    • It needs to be h264

    Thanks very much for your help !

  • During transcoding, does output quality of a video improve when i give output bitrate more than input video's bitrate ?

    19 septembre 2013, par Jobin Jose

    I use ffmpeg for converting videos.
    As i understand, the bitrate of a video stream is the number of bits which constitute the video over 1 second of time.
    What happens when i specify the output video bitrate to be more than the input video's bitrate ?
    For example :
    If bitrate of "Input.mp4" is 2000KBps and i want to convert it to "Output.mp4" with output bitrate set to 3000KBps.
    How will the converter create the extra 1000 bits(3000-2000) for every second of video ?

  • How to tell if ffmpeg errored ?

    12 septembre 2011, par Eric

    The Situation :
    I'm using ffmpeg (via php) to convert video files. I configured my convert script to return the output (as the $error array) from the exec() command. My assumption was that if no error occurred, $error would be an empty array.

    The Problem :
    The problem is that, the script returns output even if there was no error in conversion. (I can tell that there was no error because a playable video file is output.)

    The Question :
    How does ffmpeg format its errors/output ? I want to be able to parse this and determine if an error occurred and what error it was.

    Thanks !

    Code :
    *An example of a non-error output :

    FFmpeg version git-N-29201-g37c0a44, Copyright (c) 2000-2011 the FFmpeg developers|  built on Sep  9 2011 23:29:21 with gcc 4.1.2 20080704 (Red Hat 4.1.2-50)|  configuration: --prefix=/usr/local/hgffmpeg --enable-shared --enable-nonfree --enable-avfilter --enable-filter=movie --enable-gpl --enable-pthreads --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libfaac --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libxvid --extra-cflags=-I/usr/local/hgffmpeg/include/ --extra-ldflags=-L/usr/local/hgffmpeg/lib --enable-decoder=ac3 --enable-decoder=asv1 --enable-decoder=asv2 --enable-decoder=flac --enable-decoder=wmv1 --enable-decoder=wmv2 --enable-decoder=wmv3 --enable-decoder=mpeg1video --enable-decoder=mpeg2video --enable-decoder=flv --enable-decoder=fraps --enable-decoder=h263 --enable-decoder=h264 --enable-decoder=libgsm --enable-decoder=mjpeg --enable-decoder=mpeg4 --enable-decoder=mpeg4aac --enable-decoder=mpegvideo --enable-decoder=mpeg4aac --enable-decoder=msmpeg4v1 --enable-decoder=msmpeg4v2 --enable-decoder=msmpeg4v3 --enable-decoder=pcm_alaw --enable-decoder=pcm_mulaw --enable-encoder=ac3 --enable-encoder=asv1 --enable-encoder=asv2 --enable-encoder=flac --enable-encoder=h263 --enable-encoder=flashsv --enable-encoder=flv --enable-encoder=libgsm --enable-encoder=mjpeg --enable-encoder=msmpeg4v3 --enable-encoder=pcm_alaw --enable-encoder=pcm_mulaw --enable-encoder=mpeg1video --enable-encoder=mpeg2video --enable-encoder=mpeg4 --enable-encoder=msmpeg4v1 --enable-encoder=msmpeg4v2 --enable-encoder=rv10 --enable-encoder=rv20 --enable-encoder=vorbis --enable-encoder=wmav1 --enable-encoder=wmav2 --enable-encoder=wmv1 --enable-encoder=wmv2 --disable-demuxer=v4l --disable-demuxer=v4l2 --enable-version3|  libavutil    50. 40. 1 / 50. 40. 1|  libavcodec   52.120. 0 / 52.120. 0|  libavformat  52.108. 0 / 52.108. 0|  libavdevice  52.  4. 0 / 52.  4. 0|  libavfilter   1. 79. 1 /  1. 79. 1|  libswscale    0. 13. 0 /  0. 13. 0|[mpeg1video @ 0x1f6d030] skipped MB in I frame at 5 0|[mpeg1video @ 0x1f6d030] Warning MVs not available|[mpeg1video @ 0x1f6d030] concealing 260 DC, 260 AC, 260 MV errors|[mpegvideo @ 0x1f6a660] Estimating duration from bitrate, this may be inaccurate|Input #0, mpegvideo, from '../uploads/test_vid/unencodedVideo.mpg':|  Duration: 00:00:00.01, bitrate: 104860 kb/s|    Stream #0.0: Video: mpeg1video, yuv420p, 320x200 [PAR 1:1 DAR 8:5], 104857 kb/s, 23.98 fps, 23.98 tbr, 1200k tbn, 23.98 tbc|WARNING: The bitrate parameter is set too low. It takes bits/s as argument, not kbits/s|File '../uploads/test_vid/video.flv' already exists. Overwrite ? [y/N] Not overwriting - exiting

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