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• You can generate a video with audio and videos clip with ffmpeg

  8 mai 2018, par Jhonny Luis

  I am making an application in which I have to generate a single video clip of x duration, I was recommended to use the ffmpeg but I do not know if it could be created and if possible how the structure would be, since I understand that you need a file with a structure in which the path is established in this case videos and audio, I am working on codeigniter with php 7, I have already executed the ffmpeg to change the format of a video.

  The question is the following, from a database I bring the list of the route of the videos its duration and weight, equal with the audios, the thing is how I can do to create the video with ffmpeg from this.

• FFMPEG frames lost

  4 juin 2018, par ST94

  I use ffmpeg to stream video from the source to destination. The workflow is as follows,
  At the source using ffmpeg, I stream live feed from a webcam using tcp and also save a copy of the live video as mp4 file locally and the command I use is

  $ ffmpeg -hide_banner -f v4l2 -i /dev/video0 -filter:v "fps=30" -c:v libx264 -f mpegts tcp://hostname:port -c:v libx264 /path/to/.mp4file
  
  
  
  `Input #0, video4linux2,v4l2, from '/dev/video0':
  
    Duration: N/A, start: 272402.639303, bitrate: 147456 kb/s
  
      Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 640x480, 147456 kb/s, 30 fps, 30 tbr, 1000k tbn, 1000k tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
  
    Stream #0:0 -> #1:0 (rawvideo (native) -> h264 (libx264))
  
  Press [q] to stop, [?] for help
  
  No pixel format specified, yuv422p for H.264 encoding chosen.
  
  Use -pix_fmt yuv420p for compatibility with outdated media players.
  
  [libx264 @ 0x55e421ec9560] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 AVX2 LZCNT BMI2
  
  [libx264 @ 0x55e421ec9560] profile High 4:2:2, level 3.0, 4:2:2 8-bit
  
  Output #0, mpegts, to 'tcp://172.16.0.169:50000':
  
    Metadata:
  
      encoder         : Lavf57.71.100
  
      Stream #0:0: Video: h264 (libx264), yuv422p, 640x480, q=-1--1, 30 fps, 90k tbn, 30 tbc
  
      Metadata:
  
        encoder         : Lavc57.89.100 libx264
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
  
  No pixel format specified, yuv422p for H.264 encoding chosen.
  
  Use -pix_fmt yuv420p for compatibility with outdated media players.
  
  [libx264 @ 0x55e421ed5ea0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 AVX2 LZCNT BMI2
  
  [libx264 @ 0x55e421ed5ea0] profile High 4:2:2, level 3.0, 4:2:2 8-bit
  
  [libx264 @ 0x55e421ed5ea0] 264 - core 148 r2795 aaa9aa8 - H.264/MPEG-4 AVC codec - Copyleft 2003-2017 - 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=12 lookahead_threads=2 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 #1, mp4, to '/path/to/tcp.mp4':
  
    Metadata:
  
      encoder         : Lavf57.71.100
  
      Stream #1:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv422p, 640x480, q=-1--1, 30 fps, 15360 tbn, 30 tbc
  
      Metadata:
  
        encoder         : Lavc57.89.100 libx264
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
  
  [sana@localhost ~]$ frame=  978 fps= 30 q=-1.0 Lq=-1.0 size=    5062kB time=00:00:32.53 bitrate=1274.6kbits/s dup=514 drop=0 speed=0.991x    
  
  video:9174kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
  
  [libx264 @ 0x55e421ec9560] frame I:463   Avg QP:19.03  size:  9994
  
  [libx264 @ 0x55e421ec9560] frame P:476   Avg QP:22.85  size:   137
  
  [libx264 @ 0x55e421ec9560] frame B:39    Avg QP:23.33  size:    19
  
  [libx264 @ 0x55e421ec9560] consecutive B-frames: 94.7%  0.0%  0.0%  5.3%
  
  [libx264 @ 0x55e421ec9560] mb I  I16..4: 60.4% 39.0%  0.5%
  
  [libx264 @ 0x55e421ec9560] mb P  I16..4:  0.2%  0.0%  0.0%  P16..4:  4.2%  0.3%  0.5%  0.0%  0.0%    skip:94.8%
  
  [libx264 @ 0x55e421ec9560] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  0.0%  0.0%  0.0%  direct: 0.0%  skip:100.0%  L0:15.4% L1:84.6% BI: 0.0%
  
  [libx264 @ 0x55e421ec9560] 8x8 transform intra:38.9% inter:100.0%
  
  [libx264 @ 0x55e421ec9560] coded y,uvDC,uvAC intra: 34.9% 97.2% 83.8% inter: 0.0% 1.5% 0.0%
  
  [libx264 @ 0x55e421ec9560] i16 v,h,dc,p:  0% 31%  0% 69%
  
  [libx264 @ 0x55e421ec9560] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu:  3% 50% 16%  4%  2%  1%  6%  1% 17%
  
  [libx264 @ 0x55e421ec9560] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 10% 52% 14%  4%  7%  3%  5%  1%  3%
  
  [libx264 @ 0x55e421ec9560] i8c dc,h,v,p: 55% 12% 25%  8%
  
  [libx264 @ 0x55e421ec9560] Weighted P-Frames: Y:0.2% UV:0.0%
  
  [libx264 @ 0x55e421ec9560] ref P L0: 96.7%  0.5%  2.7%  0.1%
  
  [libx264 @ 0x55e421ec9560] kb/s:1151.61
  
  [libx264 @ 0x55e421ed5ea0] frame I:463   Avg QP:19.02  size: 10007
  
  [libx264 @ 0x55e421ed5ea0] frame P:477   Avg QP:22.84  size:   140
  
  [libx264 @ 0x55e421ed5ea0] frame B:39    Avg QP:23.33  size:    19
  
  [libx264 @ 0x55e421ed5ea0] consecutive B-frames: 94.7%  0.0%  0.0%  5.3%
  
  [libx264 @ 0x55e421ed5ea0] mb I  I16..4: 60.4% 39.0%  0.5%
  
  [libx264 @ 0x55e421ed5ea0] mb P  I16..4:  0.3%  0.0%  0.0%  P16..4:  4.2%  0.3%  0.5%  0.0%  0.0%    skip:94.8%
  
  [libx264 @ 0x55e421ed5ea0] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  0.0%  0.0%  0.0%  direct: 0.0%  skip:100.0%  L0:15.4% L1:84.6% BI: 0.0%
  
  [libx264 @ 0x55e421ed5ea0] 8x8 transform intra:38.9% inter:100.0%
  
  [libx264 @ 0x55e421ed5ea0] coded y,uvDC,uvAC intra: 35.0% 97.2% 84.0% inter: 0.0% 1.6% 0.0%
  
  [libx264 @ 0x55e421ed5ea0] i16 v,h,dc,p:  0% 31%  0% 69%
  
  [libx264 @ 0x55e421ed5ea0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu:  3% 50% 16%  4%  2%  1%  6%  1% 17%
  
  [libx264 @ 0x55e421ed5ea0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 10% 52% 14%  4%  7%  3%  5%  1%  3%
  
  [libx264 @ 0x55e421ed5ea0] i8c dc,h,v,p: 55% 12% 25%  8%
  
  [libx264 @ 0x55e421ed5ea0] Weighted P-Frames: Y:0.2% UV:0.0%
  
  [libx264 @ 0x55e421ed5ea0] ref P L0: 96.8%  0.5%  2.7%  0.1%
  
  [libx264 @ 0x55e421ed5ea0] kb/s:1152.39`

  At the receiver, I take the tcp url as the input and output it to an mp4 file.

  $ffmpeg -hide_banner -i tcp://hostname:port?listen out.mp4 /path/to/.mp4

  The output is

  `Input #0, mpegts, from 'tcp://172.16.0.169:50000?listen':
  
    Duration: N/A, start: 1.466667, bitrate: N/A
  
    Program 1 
  
      Metadata:
  
        service_name    : Service01
  
        service_provider: FFmpeg
  
      Stream #0:0[0x100]: Video: h264 (High 4:2:2) ([27][0][0][0] / 0x001B), yuv422p(progressive), 640x480, 30 fps, 30 tbr, 90k tbn, 60 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
  
  Press [q] to stop, [?] for help
  
  No pixel format specified, yuv422p for H.264 encoding chosen.
  
  Use -pix_fmt yuv420p for compatibility with outdated media players.
  
  [libx264 @ 0x55c1d6bff0a0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 AVX2 LZCNT BMI2
  
  [libx264 @ 0x55c1d6bff0a0] profile High 4:2:2, level 3.0, 4:2:2 8-bit
  
  [libx264 @ 0x55c1d6bff0a0] 264 - core 148 r2795 aaa9aa8 - H.264/MPEG-4 AVC codec - Copyleft 2003-2017 - 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=12 lookahead_threads=2 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 '/home/sana/Desktop/receiver_new_mp4/tcp2.mp4':
  
    Metadata:
  
      encoder         : Lavf57.71.100
  
      Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv422p, 640x480, q=-1--1, 30 fps, 15360 tbn, 30 tbc
  
      Metadata:
  
        encoder         : Lavc57.89.100 libx264
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
  
  frame=  160 fps=0.0 q=26.0 size=     158kB time=00:00:03.36 bitrate= 384.5kbits/frame=  175 fps=168 q=26.0 size=     200kB time=00:00:03.86 bitrate= 424.8kbits/frame=  190 fps=119 q=26.0 size=     242kB time=00:00:04.36 bitrate= 453.3kbits/frame=  206 fps= 97 q=29.0 size=     292kB time=00:00:04.90 bitrate= 487.8kbits/frame=  222 fps= 84 q=29.0 size=     336kB time=00:00:05.43 bitrate= 506.5kbits/frame=  238 fps= 75 q=29.0 size=     378kB time=00:00:05.96 bitrate= 519.2kbits/frame=  254 fps= 68 q=29.0 size=     422kB time=00:00:06.50 bitrate= 531.6kbits/frame=  270 fps= 64 q=26.0 size=     457kB time=00:00:07.03 bitrate= 532.0kbits/frame=  286 fps= 60 q=29.0 size=     511kB time=00:00:07.56 bitrate= 552.8kbits/frame=  302 fps= 57 q=26.0 size=     562kB time=00:00:08.10 bitrate= 568.3kbits/frame=  318 fps= 54 q=26.0 size=     609kB time=00:00:08.63 bitrate= 577.9kbits/frame=  334 fps= 52 q=26.0 size=     674kB time=00:00:09.16 bitrate= 602.7kbits/frame=  350 fps= 51 q=29.0 size=     719kB time=00:00:09.70 bitrate= 606.8kbits/frame=  366 fps= 49 q=26.0 size=     770kB time=00:00:10.23 bitrate= 616.1kbits/frame=  382 fps= 48 q=29.0 size=     828kB time=00:00:10.76 bitrate= 630.3kbits/frame=  398 fps= 47 q=26.0 size=     872kB time=00:00:11.30 bitrate= 632.0kbits/frame=  414 fps= 46 q=26.0 size=     933kB time=00:00:11.83 bitrate= 645.9kbits/frame=  430 fps= 45 q=29.0 size=     987kB time=00:00:12.36 bitrate= 653.9kbits/frame=  446 fps= 44 q=26.0 size=    1033kB time=00:00:12.90 bitrate= 656.2kbits/frame=  462 fps= 43 q=29.0 size=    1098kB time=00:00:13.43 bitrate= 669.7kbits/frame=  478 fps= 43 q=29.0 size=    1132kB time=00:00:13.96 bitrate= 664.2kbits/frame=  548 fps= 47 q=-1.0 Lsize=    1536kB time=00:00:18.16 bitrate= 692.8kbits/s speed=1.56x    
  
  video:1531kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.377405%
  
  [libx264 @ 0x55c1d6bff0a0] frame I:115   Avg QP:18.12  size:  8204
  
  [libx264 @ 0x55c1d6bff0a0] frame P:203   Avg QP:21.62  size:  1893
  
  [libx264 @ 0x55c1d6bff0a0] frame B:230   Avg QP:21.99  size:  1039
  
  [libx264 @ 0x55c1d6bff0a0] consecutive B-frames: 41.1%  6.6%  7.1% 45.3%
  
  [libx264 @ 0x55c1d6bff0a0] mb I  I16..4: 67.6% 32.3%  0.1%
  
  [libx264 @ 0x55c1d6bff0a0] mb P  I16..4: 15.3%  3.1%  0.0%  P16..4: 28.6%  2.8%  2.0%  0.0%  0.0%    skip:48.3%
  
  [libx264 @ 0x55c1d6bff0a0] mb B  I16..4:  0.8%  0.3%  0.0%  B16..8: 26.2%  0.4%  0.0%  direct:13.5%  skip:58.7%  L0:65.0% L1:34.5% BI: 0.5%
  
  [libx264 @ 0x55c1d6bff0a0] 8x8 transform intra:28.4% inter:100.0%
  
  [libx264 @ 0x55c1d6bff0a0] coded y,uvDC,uvAC intra: 15.0% 89.4% 53.1% inter: 2.6% 28.7% 0.2%
  
  [libx264 @ 0x55c1d6bff0a0] i16 v,h,dc,p:  2% 49%  1% 47%
  
  [libx264 @ 0x55c1d6bff0a0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu:  6% 57% 19%  2%  1%  1%  4%  1%  9%
  
  [libx264 @ 0x55c1d6bff0a0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 16% 59% 18%  1%  2%  1%  2%  0%  1%
  
  [libx264 @ 0x55c1d6bff0a0] i8c dc,h,v,p: 52% 17% 27%  4%
  
  [libx264 @ 0x55c1d6bff0a0] Weighted P-Frames: Y:17.7% UV:6.9%
  
  [libx264 @ 0x55c1d6bff0a0] ref P L0: 68.7%  0.7% 18.3% 10.6%  1.7%
  
  [libx264 @ 0x55c1d6bff0a0] ref B L0: 86.1% 10.6%  3.3%
  
  [libx264 @ 0x55c1d6bff0a0] ref B L1: 96.6%  3.4%
  
  [libx264 @ 0x55c1d6bff0a0] kb/s:686.10`

  From the ffmpeg processes running on both ends, if you notice the number of B frames at the receiver is more than the B frames at the sender. In other cases that I tried, the number of I as well as P frames are higher at the receiver than that at the sender.
  Can anyone please tell me why is it so ? I am not able to figure out why.

• FFmpeg encoding produces slightly incompatible MKV/MP4 container

  11 juin 2018, par james2048

  I’ve been using the FFmpeg libraries to read and write media files using the C API.

  So far, reading seems to be pretty straightforward. I am able to read frames which I can then process, convert to RGB, process, and then convert back to YUV420 to be encoded.

  The encoded files play back with VLC media player fine, and Windows Media Player if I have a codec pack installed. However, they do behave strangely : the stock Windows 10 player won’t play them, same for Adobe Premiere. Also thumbnailers don’t work on it.
  Basically it seems like nothing other than VLC or FFmpeg itself can play/process the file. I have seen this with both MP4 and MKV, so it is not a format-specific issue.

  The problems go away once you remux the file with FFmpeg, for example "ffmpeg -i input.mkv -c copy output.mkv". Everything can play the file correctly.
  Also, the "remuxing.c" sample from the official samples works as well, with the same library version and compilers that I’m using (Visual Studio 2017, FFmpeg compiled with MinGW). It will fix the file and make it playable in all software.

  I’m not sure what could be causing this. I also don’t understand what the remuxing "fixed". It must be a container issue as the frames aren’t touched by remuxing.
  I have analysed the output MKVs with FFprobe -show_packets. It seems to have budged the packet timestamps a little constant factor, and the output stream now has
  is_avc=true and nal_length_size=4 instead of is_avc=false and nal_length_size=0, but apart from that the files are identical.

  Now here’s the output of FFprobe with the 3 last test packets, stream info and format info for both streams. As you can see, they are identical except for a couple of field. But something in here must have been "fixed" during remuxing to make it work.

  [PACKET]
  
  codec_type=video
  
  stream_index=0
  
  pts=59050
  
  pts_time=59.050000
  
  dts=58890
  
  dts_time=58.890000
  
  duration=1
  
  duration_time=0.001000
  
  convergence_duration=N/A
  
  convergence_duration_time=N/A
  
  size=427
  
  pos=277358
  
  flags=__
  
  [/PACKET]
  
  [PACKET]
  
  codec_type=video
  
  stream_index=0
  
  pts=58970
  
  pts_time=58.970000
  
  dts=58970
  
  dts_time=58.970000
  
  duration=1
  
  duration_time=0.001000
  
  convergence_duration=N/A
  
  convergence_duration_time=N/A
  
  size=205
  
  pos=277792
  
  flags=__
  
  [/PACKET]
  
  [PACKET]
  
  codec_type=video
  
  stream_index=0
  
  pts=59130
  
  pts_time=59.130000
  
  dts=59050
  
  dts_time=59.050000
  
  duration=1
  
  duration_time=0.001000
  
  convergence_duration=N/A
  
  convergence_duration_time=N/A
  
  size=268
  
  pos=278004
  
  flags=__
  
  [/PACKET]
  
  [STREAM]
  
  index=0
  
  codec_name=h264
  
  codec_long_name=H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10
  
  profile=Main
  
  codec_type=video
  
  codec_time_base=1/2000
  
  codec_tag_string=[0][0][0][0]
  
  codec_tag=0x0000
  
  width=720
  
  height=576
  
  coded_width=720
  
  coded_height=576
  
  has_b_frames=2
  
  sample_aspect_ratio=N/A
  
  display_aspect_ratio=N/A
  
  pix_fmt=yuv420p
  
  level=50
  
  color_range=unknown
  
  color_space=unknown
  
  color_transfer=unknown
  
  color_primaries=unknown
  
  chroma_location=left
  
  field_order=progressive
  
  timecode=N/A
  
  refs=1
  
  is_avc=false
  
  nal_length_size=0
  
  id=N/A
  
  r_frame_rate=299/12
  
  avg_frame_rate=1000/1
  
  time_base=1/1000
  
  start_pts=0
  
  start_time=0.000000
  
  duration_ts=N/A
  
  duration=N/A
  
  bit_rate=N/A
  
  max_bit_rate=N/A
  
  bits_per_raw_sample=8
  
  nb_frames=N/A
  
  nb_read_frames=N/A
  
  nb_read_packets=737
  
  DISPOSITION:default=1
  
  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
  
  DISPOSITION:timed_thumbnails=0
  
  TAG:DURATION=00:00:59.211000000
  
  [/STREAM]
  
  [FORMAT]
  
  filename=testEncLeft.mkv
  
  nb_streams=1
  
  nb_programs=0
  
  format_name=matroska,webm
  
  format_long_name=Matroska / WebM
  
  start_time=0.000000
  
  duration=59.211000
  
  size=278349
  
  bit_rate=37607
  
  probe_score=100
  
  TAG:COMMENT=Slickline Player Export
  
  TAG:ENCODER=Lavf57.83.100
  
  [/FORMAT]

  And the info after remuxing, which works :

  [PACKET]
  
  codec_type=video
  
  stream_index=0
  
  pts=59050
  
  pts_time=59.050000
  
  dts=58890
  
  dts_time=58.890000
  
  duration=1
  
  duration_time=0.001000
  
  convergence_duration=N/A
  
  convergence_duration_time=N/A
  
  size=427
  
  pos=277418
  
  flags=__
  
  [/PACKET]
  
  [PACKET]
  
  codec_type=video
  
  stream_index=0
  
  pts=58970
  
  pts_time=58.970000
  
  dts=58970
  
  dts_time=58.970000
  
  duration=1
  
  duration_time=0.001000
  
  convergence_duration=N/A
  
  convergence_duration_time=N/A
  
  size=205
  
  pos=277852
  
  flags=__
  
  [/PACKET]
  
  [PACKET]
  
  codec_type=video
  
  stream_index=0
  
  pts=59130
  
  pts_time=59.130000
  
  dts=59050
  
  dts_time=59.050000
  
  duration=1
  
  duration_time=0.001000
  
  convergence_duration=N/A
  
  convergence_duration_time=N/A
  
  size=268
  
  pos=278064
  
  flags=__
  
  [/PACKET]
  
  [STREAM]
  
  index=0
  
  codec_name=h264
  
  codec_long_name=H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10
  
  profile=Main
  
  codec_type=video
  
  codec_time_base=1/2000
  
  codec_tag_string=[0][0][0][0]
  
  codec_tag=0x0000
  
  width=720
  
  height=576
  
  coded_width=720
  
  coded_height=576
  
  has_b_frames=2
  
  sample_aspect_ratio=N/A
  
  display_aspect_ratio=N/A
  
  pix_fmt=yuv420p
  
  level=50
  
  color_range=unknown
  
  color_space=unknown
  
  color_transfer=unknown
  
  color_primaries=unknown
  
  chroma_location=left
  
  field_order=progressive
  
  timecode=N/A
  
  refs=1
  
  is_avc=true
  
  nal_length_size=4
  
  id=N/A
  
  r_frame_rate=299/12
  
  avg_frame_rate=1000/1
  
  time_base=1/1000
  
  start_pts=0
  
  start_time=0.000000
  
  duration_ts=N/A
  
  duration=N/A
  
  bit_rate=N/A
  
  max_bit_rate=N/A
  
  bits_per_raw_sample=8
  
  nb_frames=N/A
  
  nb_read_frames=N/A
  
  nb_read_packets=737
  
  DISPOSITION:default=1
  
  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
  
  DISPOSITION:timed_thumbnails=0
  
  TAG:DURATION=00:00:59.212000000
  
  [/STREAM]
  
  [FORMAT]
  
  filename=fixedLeft.mkv
  
  nb_streams=1
  
  nb_programs=0
  
  format_name=matroska,webm
  
  format_long_name=Matroska / WebM
  
  start_time=0.000000
  
  duration=59.212000
  
  size=278409
  
  bit_rate=37615
  
  probe_score=100
  
  TAG:COMMENT=Slickline Player Export
  
  TAG:ENCODER=Lavf58.12.100
  
  [/FORMAT]

  Here is how I’m setting up the output context, for reference : it’s pretty standard, following the sample code.

  int ret;
  
  
  
  avformat_alloc_output_context2(&outputFormatCtx, nullptr, nullptr, outFilePath.c_str());
  
  
  
  av_dict_set(&outputFormatCtx->metadata, "comment", "FFmpeg Export", 0);
  
  
  
  if (!outputFormatCtx)
  
  {
  
      LOG_AND_THROW("Could not allocate output context");
  
  }
  
  
  
  outputVideoStream = avformat_new_stream(outputFormatCtx, nullptr);
  
  outputVideoStream->time_base = AVRational{ 1, AV_TIME_BASE }; // Stream timebase will be used by codec
  
  
  
  if (!outputVideoStream)
  
  {
  
      LOG_AND_THROW("Failed allocating output stream");
  
  }
  
  
  
  // defaults to "libx264"
  
  AVCodec *outCodec = avcodec_find_encoder_by_name(selectedCodecName.c_str());
  
  
  
  if (!outCodec)
  
  {
  
      LOG_AND_THROW("Failed finding output codec");
  
  }
  
  
  
  AVDictionary *opts = nullptr;
  
  
  
  if (selectedCodecName == "libx264")
  
  {
  
      opts = getX264CodecOptions();
  
  }
  
  
  
  encoderCtx = avcodec_alloc_context3(outCodec);
  
  
  
  if (!encoderCtx)
  
  {
  
      LOG_AND_THROW("Failed to allocate the encoder context");
  
  }
  
  
  
  encoderCtx->width = width;
  
  encoderCtx->height = height;
  
  encoderCtx->pix_fmt = AV_PIX_FMT_YUV420P;
  
  // time base for the frames we will provide to the encoder
  
  encoderCtx->time_base = AVRational{ 1, AV_TIME_BASE };
  
  // convert framerate from double to rational
  
  encoderCtx->framerate = AVRational{ (int)(frameRate * AV_TIME_BASE), AV_TIME_BASE};
  
  
  
  // Match encoderCtx time base for the stream
  
  outputVideoStream->time_base = encoderCtx->time_base;
  
  
  
  ret = avcodec_open2(encoderCtx, outCodec, &opts);
  
  
  
  if (ret < 0)
  
  {
  
      LOG_AND_THROW_PARAM("Cannot open video encoder for stream: %d", ret);
  
  }
  
  
  
  // Fill in some params for MP4 stream, details about encoder
  
  ret = avcodec_parameters_from_context(outputVideoStream->codecpar, encoderCtx);
  
  
  
  if (ret < 0)
  
  {
  
      LOG_AND_THROW_PARAM("Failed to copy encoder parameters to output stream: %d", ret);
  
  }
  
  
  
  if (outputFormatCtx->oformat->flags & AVFMT_GLOBALHEADER)
  
  {
  
      encoderCtx->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
  
  }
  
  
  
  av_dump_format(outputFormatCtx, 0, filePath.c_str(), 1);
  
  
  
  // End of encoder settings, setting up MP4
  
  if (!(outputFormatCtx->oformat->flags & AVFMT_NOFILE))
  
  {
  
      ret = avio_open(&outputFormatCtx->pb, outFilePath.c_str(), AVIO_FLAG_WRITE);
  
  
  
      if (ret < 0)
  
      {
  
          LOG_AND_THROW_PARAMSTR("Could not open output file '%s'", outFilePath.c_str());
  
      }
  
  }
  
  
  
  ret = avformat_write_header(outputFormatCtx, nullptr);
  
  
  
  if (ret < 0)
  
  {
  
      LOG_AND_THROW_PARAM("Error occurred when opening output file for writing: %d", ret);
  
  }

  Can anyone help me figure out why the container is not playing properly ?

  Thanks in advance.

  -James