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• Wo can tell me the difference and relation between ffmpeg 、libav and avconv

  28 février 2012, par why

  when I run ffmpeg on ubuntu, it shows :

  ffmpeg 
  
  ffmpeg version v0.8, Copyright (c) 2000-2011 the Libav developers
  
    built on Feb 28 2012 13:27:36 with gcc 4.6.1
  
  This program is not developed anymore and is only provided for compatibility. Use avconv instead (see Changelog for the list of incompatible changes).
  
  Hyper fast Audio and Video encoder
  
  usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options] outfile}...
  
  
  
  Use -h to get full help or, even better, run 'man ffmpeg'

  I found avconv on http://libav.org, I am just perplexed by them

• avconv stops streaming after some time

  4 juin 2014, par Dhrumil Doshi

  I am using raspberry-pi board and a usb camera attached with it. i use avconv tool to capture live video from camera and streaming it on network using rtp protocol.

  My command on server(raspberry-pi board) is as below :

  avconv -f video4linux2 -s 160x120 -i /dev/video0 -vcodec mpeg2video -r 25 -pix_fmt yuv420p -me_method epzs -b 2600k -bt 256k -f rtp rtp ://192.168.1.141:8554

  streaming works successfully using this command. Here IP address 192.168.1.141 is the ip address of my client pc. i can play live streaming on client side using vlc successfully.

  But Issue is after some time encoding and streaming on server stop automatically. And command hangs there.

  Output on server is as below :

  $ avconv -f video4linux2 -s 160x120 -v debug -i /dev/video0 -vcodec mpeg2video -r 25 -pix_fmt yuv420p -me_method epzs -b 2600k -bt 256k -f rtp rtp://192.168.1.141:8554
  
  avconv version 0.8.10-6:0.8.10-1+rpi1, Copyright (c) 2000-2013 the Libav developers
  
    built on Mar 22 2014 02:13:15 with gcc 4.6.3
  
    configuration: --arch=arm --enable-pthreads --enable-runtime-cpudetect --extra-version='6:0.8.10-1+rpi1' --libdir=/usr/lib/arm-linux-gnueabihf --prefix=/usr --disable-yasm --enable-bzlib --enable-libdc1394 --enable-libdirac --enable-libfreetype --enable-frei0r --enable-gnutls --enable-libgsm --enable-libmp3lame --enable-librtmp --enable-libopencv --enable-libopenjpeg --enable-libpulse --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-vaapi --enable-vdpau --enable-libvorbis --enable-libvpx --enable-zlib --enable-gpl --enable-postproc --enable-swscale --enable-libcdio --enable-x11grab --enable-libx264 --enable-libxvid --shlibdir=/usr/lib/arm-linux-gnueabihf --enable-shared --disable-static
  
    libavutil    51. 22. 2 / 51. 22. 2
  
    libavcodec   53. 35. 0 / 53. 35. 0
  
    libavformat  53. 21. 1 / 53. 21. 1
  
    libavdevice  53.  2. 0 / 53.  2. 0
  
    libavfilter   2. 15. 0 /  2. 15. 0
  
    libswscale    2.  1. 0 /  2.  1. 0
  
    libpostproc  52.  0. 0 / 52.  0. 0
  
  [video4linux2 @ 0x54d7a0] [4]Capabilities: 84000001
  
  [video4linux2 @ 0x54d7a0] The V4L2 driver changed the pixel format from 0x32315559 to 0x56595559
  
      Last message repeated 1 times
  
  [video4linux2 @ 0x54d7a0] The V4L2 driver changed the pixel format from 0x50323234 to 0x56595559
  
  [video4linux2 @ 0x54d7a0] The V4L2 driver set input_id: 0, input: Camera 1
  
  [rawvideo @ 0x54f860] err{or,}_recognition separate: 1; 1
  
  [rawvideo @ 0x54f860] err{or,}_recognition combined: 1; 1
  
  [video4linux2 @ 0x54d7a0] All info found
  
  [video4linux2 @ 0x54d7a0] Estimating duration from bitrate, this may be inaccurate
  
  Input #0, video4linux2, from '/dev/video0':
  
    Duration: N/A, start: 21891.364784, bitrate: 9216 kb/s
  
      Stream #0.0, 1, 1/1000000: Video: rawvideo, yuyv422, 160x120, 1/30, 9216 kb/s, 30 tbr, 1000k tbn, 30 tbc
  
  [buffer @ 0x54f220] w:160 h:120 pixfmt:yuyv422
  
  [avsink @ 0x54d740] auto-inserting filter 'auto-inserted scaler 0' between the filter 'src' and the filter 'out'
  
  [scale @ 0x54f7e0] w:160 h:120 fmt:yuyv422 -> w:160 h:120 fmt:yuv420p flags:0x4
  
  [mpeg2video @ 0x54ea60] err{or,}_recognition separate: 1; 1
  
  [mpeg2video @ 0x54ea60] err{or,}_recognition combined: 1; 1
  
  [mpeg2video @ 0x54ea60] detected 1 logical cores
  
  [mpeg2video @ 0x54ea60] Unsupported bit depth: 0
  
  [rawvideo @ 0x54f860] err{or,}_recognition separate: 1; 1
  
  [rawvideo @ 0x54f860] err{or,}_recognition combined: 1; 1
  
  Output #0, rtp, to 'rtp://192.168.1.141:8554':
  
    Metadata:
  
      encoder         : Lavf53.21.1
  
      Stream #0.0, 0, 1/90000: Video: mpeg2video, yuv420p, 160x120, 1/25, q=2-31, 2600 kb/s, 90k tbn, 25 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (rawvideo -> mpeg2video)
  
  SDP:
  
  v=0
  
  o=- 0 0 IN IP4 127.0.0.1
  
  s=No Name
  
  c=IN IP4 192.168.1.141
  
  t=0 0
  
  a=tool:libavformat 53.21.1
  
  m=video 8554 RTP/AVP 32
  
  b=AS:2600
  
  
  
  Press ctrl-c to stop encoding
  
  *** drop!
  
      Last message repeated 1 times
  
  *** 1 dup!
  
  *** 16 dup! fps= 25 q=2.0 size=    1027kB time=5.24 bitrate=1605.2kbits/s dup=1 drop=2    
  
  *** drop!
  
      Last message repeated 11 times
  
  *** drop!49 fps= 26 q=2.0 size=    1059kB time=5.92 bitrate=1464.9kbits/s dup=17 drop=14    
  
      Last message repeated 2 times
  
  *** drop!76 fps= 25 q=2.0 size=    2022kB time=11.00 bitrate=1505.7kbits/s dup=17 drop=17    
  
  *** drop!48 fps= 25 q=2.0 size=    4086kB time=21.88 bitrate=1529.8kbits/s dup=17 drop=18    
  
  *** 1 dup!
  
  *** 1 dup!0 fps= 25 q=2.0 size=    4171kB time=22.36 bitrate=1528.2kbits/s dup=18 drop=19    
  
  *** 1 dup!1 fps= 25 q=2.0 size=    4859kB time=26.00 bitrate=1530.8kbits/s dup=19 drop=19    
  
  *** 1 dup!0 fps= 25 q=2.0 size=    5152kB time=27.56 bitrate=1531.5kbits/s dup=20 drop=19    
  
  *** 1 dup!3 fps= 25 q=2.0 size=    5250kB time=28.08 bitrate=1531.7kbits/s dup=21 drop=19    
  
  *** drop!64 fps= 25 q=2.0 size=    7215kB time=38.52 bitrate=1534.5kbits/s dup=22 drop=19    
  
  *** 1 dup!6 fps= 25 q=2.0 size=    7306kB time=39.00 bitrate=1534.6kbits/s dup=22 drop=20    
  
  *** drop!07 fps= 25 q=2.0 size=    8288kB time=44.24 bitrate=1534.7kbits/s dup=23 drop=20    
  
  *** 1 dup!0 fps= 25 q=2.0 size=   10054kB time=53.56 bitrate=1537.8kbits/s dup=23 drop=21    
  
  *** 1 dup!9 fps= 25 q=2.0 size=   10342kB time=55.12 bitrate=1537.1kbits/s dup=24 drop=21    
  
      Last message repeated 1 times
  
  *** drop!93 fps= 25 q=1.6 size=   10445kB time=55.68 bitrate=1536.7kbits/s dup=26 drop=21    
  
  *** 1 dup!
  
  *** 7036829 dup! 25 q=2.0 size=   10630kB time=56.68 bitrate=1536.4kbits/s dup=27 drop=22 

  Any ideas ?

  Thanks in advance.

• Encode x264 video with ffmpeg for Android with starting offset

  4 août 2013, par scubed

  I'm trying to convert a video to play on an Android device.
  The video is from a big movie. I am chopping it back into pieces
  to correspond with the actual segments of the movie using -ss and -t.

  The input is mp4 with H.264 and AAC.
  The output is mkv using H.264 and Vorbis.

  Specifically, the input is :

  Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 320x240, 2240 kb/s, 29.97 fps, 60 tbr, 90k tbn, 180k tbc
  
  Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, s16, 162 kb/s

  I'm using : ffmpeg version 1.0.7

  The command I'm trying is something like :

  ffmpeg -ss 00:03:52.000 -i in.mp4 -t 00:01:00.000 -c:v libx264 -preset medium -crf 20 -maxrate 400k -bufsize 1835k -c:a libvorbis -sn out.mkv

  However, while the resulting video works fine on my computer, when I click on
  my phone, it says : Can't play video
  and checking the Android log, it has :

  E/SoftAVC (24319): Decoder failed: -2
  
  E/OMXCodec(24319): [OMX.google.h264.decoder] ERROR(0x80001001, -1007)

  It is still able to make a thumbnail for the movie, but not play it.

  Interestingly, some simple variations of that command do work :
  Remove -ss to start at the beginning of the video
  Use -an to disable audio

  These variations still failed :
  Copying the original audio with -c:a copy, or other audio codecs like vorbis, mp3
  Using mp4 instead of mkv
  Using baseline H.264 profile, including restricting level to 1.2.

  Running through mkvmerge first not only fails, but makes Android not able to even make a thumbnail.

  I don't know if it is related, but another small thing I noticed is that for
  starting transcoding later in the movie, the audio starts out slightly out-of-sync.
  After several seconds, it gets back in sync. The audio is in sync in the original.

  Robert Rowntree :

  -vcodec libx264 -b:v 200k -bt 50k -threads 0 -b_strategy 1 -acodec copy -f mp4 -strict -2

  Interesting. Your command almost works. The video actually plays on Android. The one problem is that the audio is out-of-sync and stays out-of-sync throughout the whole clip. But, that's much closer than I've been. I'll search around there and see if I can find the right combination.

  I tried combinations of it. It appears that using both mp4 and copying the audio is what allows it to work. Using libvorbis or going to mkv breaks it again. But, I would like to transcode the audio, and I suspect to keep it in sync, I might have to transcode it anyways. Note that even with transcoding, when I play it back on the computer, I still don't have sync between audio and video.

  LordNeckbeard :
  Here is the complete log.

  ffmpeg version 1.0.7 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Jul 27 2013 13:01:19 with gcc 4.4.5 (Gentoo 4.4.5 p1.2, pie-0.4.5)
  
    configuration: --prefix=/usr --libdir=/usr/lib64 --shlibdir=/usr/lib64 --mandir=/usr/share/man --enable-shared --cc=x86_64-pc-linux-gnu-gcc --cxx=x86_64-pc-linux-gnu-g++ --ar=x86_64-pc-linux-gnu-ar --optflags='-mtune=athlon64 -O2 -pipe -fomit-frame-pointer -fstack-protector' --extra-cflags='-mtune=athlon64 -O2 -pipe -fomit-frame-pointer -fstack-protector' --extra-cxxflags='-mtune=athlon64 -O2 -pipe -fomit-frame-pointer -fstack-protector' --disable-static --enable-gpl --enable-version3 --enable-postproc --enable-avfilter --enable-avresample --disable-stripping --disable-debug --disable-doc --disable-vaapi --disable-runtime-cpudetect --enable-libmp3lame --enable-libvo-aacenc --enable-libtheora --enable-libx264 --enable-libxvid --enable-libcaca --enable-openal --disable-indev=v4l2 --disable-indev=oss --disable-indev=jack --enable-x11grab --disable-outdev=oss --enable-libfreetype --enable-pthreads --enable-libspeex --enable-libvorbis --disable-altivec --disable-avx --disable-vis --disable-neon --cpu=athlon64 -  libavutil      51. 73.101 / 51. 73.101
  
    libavcodec     54. 59.100 / 54. 59.100
  
    libavformat    54. 29.104 / 54. 29.104
  
    libavdevice    54.  2.101 / 54.  2.101
  
    libavfilter     3. 17.100 /  3. 17.100
  
    libswscale      2.  1.101 /  2.  1.101
  
    libswresample   0. 15.100 /  0. 15.100
  
    libpostproc    52.  0.100 / 52.  0.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'in.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: mp42isomavc1
  
      creation_time   : 2013-07-13 02:23:51
  
      encoder         : HandBrake 0.9.6 2012022800
  
    Duration: 03:14:01.41, start: 0.000000, bitrate: 2408 kb/s
  
      Chapter #0.0: start -0.133467, end 648.697411
  
      Metadata:
  
        title           : Chapter  1
  
      Chapter #0.1: start 648.697411, end 1297.345411
  
      Metadata:
  
        title           : Chapter  2
  
      Chapter #0.2: start 1297.345411, end 1729.777411
  
      Metadata:
  
        title           : Chapter  3
  
      Chapter #0.3: start 1729.777411, end 2378.425411
  
      Metadata:
  
        title           : Chapter  4
  
      Chapter #0.4: start 2378.425411, end 3027.073411
  
      Metadata:
  
        title           : Chapter  5
  
      Chapter #0.5: start 3027.073411, end 3675.721411
  
      Metadata:
  
        title           : Chapter  6
  
      Chapter #0.6: start 3675.721411, end 4108.153411
  
      Metadata:
  
        title           : Chapter  7
  
      Chapter #0.7: start 4108.153411, end 4756.801411
  
      Metadata:
  
        title           : Chapter  8
  
      Chapter #0.8: start 4756.801411, end 5405.449411
  
      Metadata:
  
        title           : Chapter  9
  
      Chapter #0.9: start 5405.449411, end 6054.097411
  
      Metadata:
  
        title           : Chapter 10
  
      Chapter #0.10: start 6054.097411, end 6702.745411
  
      Metadata:
  
        title           : Chapter 11
  
      Chapter #0.11: start 6702.745411, end 7135.177411
  
      Metadata:
  
        title           : Chapter 12
  
      Chapter #0.12: start 7135.177411, end 7783.825411
  
      Metadata:
  
        title           : Chapter 13
  
      Chapter #0.13: start 7783.825411, end 8432.473411
  
      Metadata:
  
        title           : Chapter 14
  
      Chapter #0.14: start 8432.473411, end 9081.121411
  
      Metadata:
  
        title           : Chapter 15
  
      Chapter #0.15: start 9081.121411, end 9513.553411
  
      Metadata:
  
        title           : Chapter 16
  
      Chapter #0.16: start 9513.553411, end 10162.201411
  
      Metadata:
  
        title           : Chapter 17
  
      Chapter #0.17: start 10162.201411, end 10810.849411
  
      Metadata:
  
        title           : Chapter 18
  
      Chapter #0.18: start 10810.849411, end 11459.497411
  
      Metadata:
  
        title           : Chapter 19
  
      Chapter #0.19: start 11459.497411, end 11641.412478
  
      Metadata:
  
        title           : Chapter 20
  
      Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 320x240, 2240 kb/s, 29.97 fps, 60 tbr, 90k tbn, 180k tbc
  
      Metadata:
  
        creation_time   : 2013-07-13 02:23:51
  
      Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, s16, 162 kb/s
  
      Metadata:
  
        creation_time   : 2013-07-13 02:23:51
  
      Stream #0:2(und): Subtitle: mov_text (text / 0x74786574)
  
      Metadata:
  
        creation_time   : 2013-07-13 02:23:51
  
  [libx264 @ 0x14ea220] using cpu capabilities: MMX2 SSE2Slow SlowCTZ
  
  [libx264 @ 0x14ea220] profile High, level 2.1
  
  [libx264 @ 0x14ea220] 264 - core 120 - H.264/MPEG-4 AVC codec - Copyleft 2003-2011 - 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=3 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=60 keyint_min=6 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=20.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 vbv_maxrate=400 vbv_bufsize=1835 crf_max=0.0 nal_hrd=none ip_ratio=1.40 aq=1:1.00
  
  Output #0, matroska, to 'out.mkv':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: mp42isomavc1
  
      encoder         : Lavf54.29.104
  
      Chapter #0.0: start 0.000000, end 60.000000
  
      Metadata:
  
        title           : Chapter  1
  
      Stream #0:0(und): Video: h264 (H264 / 0x34363248), yuv420p, 320x240, q=-1--1, 1k tbn, 60 tbc
  
      Metadata:
  
        creation_time   : 2013-07-13 02:23:51
  
      Stream #0:1(und): Audio: vorbis (oV[0][0] / 0x566F), 48000 Hz, stereo, flt
  
      Metadata:
  
        creation_time   : 2013-07-13 02:23:51
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 -> libx264)
  
    Stream #0:1 -> #0:1 (aac -> libvorbis)
  
  Press [q] to stop, [?] for help
  
  frame= 1799 fps= 92 q=-1.0 Lsize=    3738kB time=00:00:59.98 bitrate= 510.5kbits/s dup=0 drop=51    =51    
  
  video:3016kB audio:683kB subtitle:0 global headers:4kB muxing overhead 0.939943%
  
  [libx264 @ 0x14ea220] frame I:31    Avg QP:20.23  size: 14126
  
  [libx264 @ 0x14ea220] frame P:634   Avg QP:23.03  size:  3317
  
  [libx264 @ 0x14ea220] frame B:1134  Avg QP:27.71  size:   482
  
  [libx264 @ 0x14ea220] consecutive B-frames:  2.3% 12.8% 84.7%  0.2%
  
  [libx264 @ 0x14ea220] mb I  I16..4:  3.8% 63.8% 32.4%
  
  [libx264 @ 0x14ea220] mb P  I16..4:  0.1%  0.3%  0.1%  P16..4: 47.4% 30.2% 19.5%  0.0%  0.0%    skip: 2.4%
  
  [libx264 @ 0x14ea220] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8: 35.2%  3.0%  0.6%  direct: 8.8%  skip:52.3%  L0:28.7% L1:63.9% BI: 7.4%
  
  [libx264 @ 0x14ea220] 8x8 transform intra:64.0% inter:59.5%
  
  [libx264 @ 0x14ea220] coded y,uvDC,uvAC intra: 94.2% 99.5% 95.5% inter: 23.3% 55.5% 14.0%
  
  [libx264 @ 0x14ea220] i16 v,h,dc,p: 75% 10%  5% 10%
  
  [libx264 @ 0x14ea220] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 19% 16% 12%  8%  7%  8%  8% 11% 11%
  
  [libx264 @ 0x14ea220] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 17% 20%  7%  8%  9%  9% 10% 10% 11%
  
  [libx264 @ 0x14ea220] i8c dc,h,v,p: 38% 31% 14% 17%
  
  [libx264 @ 0x14ea220] Weighted P-Frames: Y:7.3% UV:4.4%
  
  [libx264 @ 0x14ea220] ref P L0: 48.8% 14.2% 29.1%  7.5%  0.4%
  
  [libx264 @ 0x14ea220] ref B L0: 65.4% 30.8%  3.7%
  
  [libx264 @ 0x14ea220] ref B L1: 89.0% 11.0%
  
  [libx264 @ 0x14ea220] kb/s:411.70