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• How to encode H.264 video using FFmpeg C API and then open the output with a media player ?

  4 avril 2016, par GummiB

  I’m trying to encode a H.264 video with the FFMPEG C API.
  I have successfully compiled and executed the decoding/encoding example provided by FFMPEG.

  The problem I’m facing is that the .mpg file (encoded with AV_CODEC_ID_MPEG1VIDEO) the example creates works. Windows creates a thumbnail and everything. On the other hand the .h264 (encoded with AV_CODEC_ID_H264) file does not. When I try to play the file in VLC the play/pause button just flickers, no thumbnail in windows, no nothing.

  During encoding libx264 reports the following :

  [libx264 @ 004b81a0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
  
  [libx264 @ 004b81a0] profile High, level 1.3
  
  [libx264 @ 004b81a0] frame I:3     Avg QP:26.79  size:  2116
  
  [libx264 @ 004b81a0] frame P:12    Avg QP:26.60  size:   789
  
  [libx264 @ 004b81a0] frame B:10    Avg QP:31.39  size:   499
  
  [libx264 @ 004b81a0] consecutive B-frames: 20.0% 80.0%
  
  [libx264 @ 004b81a0] mb I  I16..4: 78.3% 11.6% 10.1%
  
  [libx264 @ 004b81a0] mb P  I16..4: 77.4%  0.6%  0.1%  P16..4: 20.3%  0.7%  0.9%  0.0%  0.0%    skip: 0.0%
  
  [libx264 @ 004b81a0] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  9.4%  0.2%  0.0%  direct:11.0%  skip:79.4%  L0:25.4% L1:35.4% BI:39.2%
  
  [libx264 @ 004b81a0] final ratefactor: 17.03
  
  [libx264 @ 004b81a0] 8x8 transform intra:3.4% inter:31.3%
  
  [libx264 @ 004b81a0] direct mvs  spatial:0.0% temporal:100.0%
  
  [libx264 @ 004b81a0] coded y,uvDC,uvAC intra: 4.4% 35.8% 1.6% inter: 1.3% 34.5% 9.5%
  
  [libx264 @ 004b81a0] i16 v,h,dc,p:  0%  0%  0% 100%
  
  [libx264 @ 004b81a0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu:  7% 20% 17% 49%  0%  0%  0%  1%  6%
  
  [libx264 @ 004b81a0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 14%  7% 18% 45%  2%  7%  2%  3%  2%
  
  [libx264 @ 004b81a0] i8c dc,h,v,p:  2%  6%  4% 88%
  
  [libx264 @ 004b81a0] Weighted P-Frames: Y:0.0% UV:0.0%
  
  [libx264 @ 004b81a0] ref P L0: 95.6%  1.6%  2.2%  0.5%  0.2%
  
  [libx264 @ 004b81a0] ref B L0: 67.5% 28.5%  3.2%  0.8%
  
  [libx264 @ 004b81a0] kb/s:166.45

  "ffprobe.exe test.h264 -show_streams" returns

  [STREAM]
  
  index=0
  
  codec_name=h264
  
  codec_long_name=H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10
  
  profile=High
  
  codec_type=video
  
  codec_time_base=1/50
  
  codec_tag_string=[0][0][0][0]
  
  codec_tag=0x0000
  
  width=352
  
  height=288
  
  has_b_frames=1
  
  sample_aspect_ratio=0:1
  
  display_aspect_ratio=0:1
  
  pix_fmt=yuv420p
  
  level=13
  
  timecode=N/A
  
  id=N/A
  
  r_frame_rate=50/2
  
  avg_frame_rate=25/1
  
  time_base=1/1200000
  
  start_pts=N/A
  
  start_time=N/A
  
  duration_ts=N/A
  
  duration=N/A
  
  bit_rate=N/A
  
  nb_frames=N/A
  
  nb_read_frames=N/A
  
  nb_read_packets=N/A
  
  DISPOSITION:default=0
  
  DISPOSITION:dub=0
  
  DISPOSITION:original=0
  
  DISPOSITION:comment=0
  
  DISPOSITION:lyrics=0
  
  DISPOSITION:karaoke=0
  
  DISPOSITION:forced=0
  
  DISPOSITION:hearing_impaired=0
  
  DISPOSITION:visual_impaired=0
  
  DISPOSITION:clean_effects=0
  
  DISPOSITION:attached_pic=0
  
  [/STREAM]

  There you can see :

  start_time=N/A
  
  duration_ts=N/A
  
  duration=N/A

  I have tried countless changes to the AVCodecContext and multitude of parameters options to av_opt_set function. Still no luck getting a working H.264 video. I have even tried different builds of FFmpeg. No luck.

  I’m using the "FFmpeg git-0fb64da 32-bit Dev" build from Zeranoe and MinGw 4.7.2

• Merge commit ’c39059bea3adebcd888571d1181db215eee54495’

  21 juillet 2014, par Michael Niedermayer

  Merge commit ’c39059bea3adebcd888571d1181db215eee54495’
  * commit ’c39059bea3adebcd888571d1181db215eee54495’ :
  
    h264 : Fix direct temporal mvs for bottom-field-first poc order
  Conflicts :
  
  	libavcodec/h264_direct.c
  See : ebd1c505d22ad96e044880755ed9f4cf7cab4f78
  
  Merged-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavcodec/h264_direct.c

• ffmpeg slideshow on raspberry pi raspbian

  29 novembre 2017, par mysterious_guy

  i’m trying to make slideshow video from few (in this case 3) .jpgs. To do this i’m using

      ffmpeg -r 1/5 -i bat%03d.jpg -c:v libx264 -r 30 -pix_fmt yuv420p proba12.mp4

  and actually it works on windows (it plays every image for 5seconds) but on raspbian it doesnt work neither on omxplayer nor hello_video.bin (in h264).

  Here is what console shows :

  pi@raspberrypi:~/Downloads $ ffmpeg -r 1/5 -i bat%03d.jpg -c:v libx264 -r 30 -pix_fmt yuv420p proba12.mp4
  
  ffmpeg version N-89047-g54f8ac199f Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 6.3.0 (Raspbian 6.3.0-18+rpi1) 20170516
  
    configuration: --arch=armel --target-os=linux --enable-gpl --enable-libx264 --enable-nonfree
  
    libavutil      56.  0.100 / 56.  0.100
  
    libavcodec     58.  3.101 / 58.  3.101
  
    libavformat    58.  2.100 / 58.  2.100
  
    libavdevice    58.  0.100 / 58.  0.100
  
    libavfilter     7.  0.101 /  7.  0.101
  
    libswscale      5.  0.101 /  5.  0.101
  
    libswresample   3.  0.101 /  3.  0.101
  
    libpostproc    55.  0.100 / 55.  0.100
  
  Input #0, image2, from 'bat%03d.jpg':
  
    Duration: 00:00:00.12, start: 0.000000, bitrate: N/A
  
  Stream #0:0: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 1920x1080             
  
  [SAR 1:1 DAR 16:9], 25 fps, 25 tbr, 25 tbn, 25 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (mjpeg (native) -> h264 (libx264))
  
    Press [q] to stop, [?] for help
  
  [swscaler @ 0x31ac620] deprecated pixel format used, make sure you did set range correctly
  
  [libx264 @ 0x30fef00] using SAR=1/1
  
  [libx264 @ 0x30fef00] using cpu capabilities: ARMv6 NEON
  
  [libx264 @ 0x30fef00] profile High, level 4.0
  
  [libx264 @ 0x30fef00] 264 - core 152 r2851 ba24899 - H.264/MPEG-4 AVC codec     - Copyleft 2003-2017 - http://www.videolan.org/x264.html - options: cabac=1 r               ef=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 fa               st_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
  
  Output #0, mp4, to 'proba12.mp4':
  
    Metadata:
  
  encoder         : Lavf58.2.100
  
  Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], q=-1--1, 30 fps, 15360 tbn, 30 tbc
  
  Metadata:
  
    encoder         : Lavc58.3.101 libx264
  
  Side data:
  
    cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
  
  frame=  449 fps=8.0 q=-1.0 Lsize=    1341kB time=00:00:14.86 bitrate= 738.9kbits/s dup=446 drop=0 speed=0.265x
  
  video:1335kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.457740%
  
  [libx264 @ 0x30fef00] frame I:3     Avg QP:15.58  size:442255
  
  [libx264 @ 0x30fef00] frame P:113   Avg QP:18.36  size:   130
  
  [libx264 @ 0x30fef00] frame B:333   Avg QP:27.00  size:    74
  
  [libx264 @ 0x30fef00] consecutive B-frames:  1.1%  0.0%  0.0% 98.9%
  
  [libx264 @ 0x30fef00] mb I  I16..4:  2.0% 94.5%  3.5%
  
  [libx264 @ 0x30fef00] mb P  I16..4:  0.0%  0.0%  0.0%  P16..4:  0.4%  0.0%  0.0%  0.0%  0.0%    skip:99.6%
  
  [libx264 @ 0x30fef00] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  0.1%  0.0%  0.0%  direct: 0.0%  skip:99.9%  L0:19.2% L1:80.8% BI: 0.0%
  
  [libx264 @ 0x30fef00] 8x8 transform intra:94.5% inter:61.3%
  
  [libx264 @ 0x30fef00] coded y,uvDC,uvAC intra: 85.4% 31.7% 25.4% inter: 0.0% 0.1% 0.0%
  
  [libx264 @ 0x30fef00] i16 v,h,dc,p: 43% 20%  9% 29%
  
  [libx264 @ 0x30fef00] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 18% 11% 33%  5%  7%  6%  8%  5%  8%
  
  [libx264 @ 0x30fef00] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 21% 14% 15%  7% 11%  8%  9%  9%  6%
  
  [libx264 @ 0x30fef00] i8c dc,h,v,p: 82%  8%  7%  3%
  
  [libx264 @ 0x30fef00] Weighted P-Frames: Y:0.0% UV:0.0%
  
  [libx264 @ 0x30fef00] ref P L0: 99.5%  0.0%  0.4%  0.1%
  
  [libx264 @ 0x30fef00] ref B L0: 71.2% 28.6%  0.3%
  
  [libx264 @ 0x30fef00] ref B L1: 99.1%  0.9%
  
  [libx264 @ 0x30fef00] kb/s:730.29

  what is also strange if im trying to concatenate those files using text file and i set duration to 5 for every single file it makes different display time... in this example first one displays for 15 seconds, second one for 5seconds and the last one for 10seconds... of course this way of merging images doesnt work under raspbian either

  i’m using raspberry pi 3b with latest raspbian noobs on board

  can you guys please direct me on a solution ? im ran out of ideas... cheers