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• Can't get the right formula to set frame pts for a stream using libav

  4 avril 2022, par user1365836

  I'm trying to save a stream of frames as mp4.
Source framerate is not fixed and it stay in the range [15,30]

  


  Encoder params :

  


  ...
eCodec.time_base = AVRational(1,3000);
eCodec.framerate = AVRational(30, 1);
...


  


  Stream params :

  


  eStream = avformat_new_stream(eFormat, null);                
eStream.codecpar = codecParams;
eStream.time_base = eCodec.time_base;


  


  Decoder time_base is 0/1 and it marks each frame with a pts like :

  


  480000
528000
576000
...


  


  PTS(f) is always == PTS(f-1)+48000

  


  Encoding (dFrame is the received frame, micro the elapsed time in microseconds) :

  


  av_frame_copy(eFrame, dFrame);
eFrame.pts = micro*3/1000;


  


  This make the video playing too fast.
I can't understand why, but changing micro*3/1000 to micro*3*4/1000 make the video play at the correct speed (checked against a clock after many minutes of varying fps)

  


  What am I missing ?

  


• issue streaming to instagram with FFmpeg

  24 septembre 2021, par 1 K1

  Trying to stream from OBS using nginx server to Instagram using ffmpeg. There are no problem If I stream with a same settings to facebook. There is only a problem while streaming to Instagram. Also, if I do stream a video file instead of camera from OBS, there are no problem. So there is a problem While streaming from OBS through nginx server with ffmpeg.

  


  command is : ffmpeg -i rtmp://192.168.12.190:1935/live -filter_complex " [0] transpose=dir=1 [rotated] ; [rotated] scale=480:-2 " -max_muxing_queue_size 9999 -preset superfast -b:v 2000k -minrate 1500k -maxrate 3000k -bufsize 3200k -vcodec libx264 -r 30 -f flv rtmps://live-upload.instagram.com:443/rtmp/!streamKey!

  


  Getting following log from mmpeg :

  


  ffmpeg version N-90636-gc837918f50 Copyright (c) 2000-2018 the FFmpeg developers
 built with gcc 7.3.0 (GCC)
 configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth
 libavutil      56. 13.100 / 56. 13.100
 libavcodec     58. 17.100 / 58. 17.100
 libavformat    58. 11.101 / 58. 11.101
 libavdevice    58.  2.100 / 58.  2.100
 libavfilter     7. 14.100 /  7. 14.100
 libswscale      5.  0.102 /  5.  0.102
 libswresample   3.  0.101 /  3.  0.101
 libpostproc    55.  0.100 / 55.  0.100
Input #0, flv, from 'rtmp://192.168.12.190:1935/live':
 Metadata:
   Server          : NGINX RTMP (github.com/arut/nginx-rtmp-module)
   displayWidth    : 1280
   displayHeight   : 720
   fps             : 30
   profile         :
   level           :
 Duration: 00:00:00.00, start: 836.994000, bitrate: N/A
   Stream #0:0: Audio: aac (LC), 48000 Hz, stereo, fltp, 163 kb/s
   Stream #0:1: Video: h264 (High), yuv420p(tv, bt709, progressive), 1280x720 [SAR 1:1 DAR 16:9], 5120 kb/s, 30 fps, 30 tbr, 1k tbn, 60 tbc
Stream mapping:
 Stream #0:1 (h264) -> transpose (graph 0)
 scale (graph 0) -> Stream #0:0 (libx264)
 Stream #0:0 -> #0:1 (aac (native) -> mp3 (libmp3lame))
Press [q] to stop, [?] for help
[libx264 @ 000001a25ad8e6c0] using SAR=1281/1280
[libx264 @ 000001a25ad8e6c0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 000001a25ad8e6c0] profile High, level 3.1
[libx264 @ 000001a25ad8e6c0] 264 - core 155 r2901 7d0ff22 - H.264/MPEG-4 AVC codec - Copyleft 2003-2018 - http://www.videolan.org/x264.html - options: cabac=1 ref=1 deblock=1:0:0 analyse=0x3:0x3 me=dia subme=1 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=18 lookahead_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=1 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=0 rc=abr mbtree=0 bitrate=2000 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 vbv_maxrate=3000 vbv_bufsize=3200 nal_hrd=none filler=0 ip_ratio=1.40 pb_ratio=1.30 aq=1:1.00
Output #0, flv, to 'rtmps://live-upload.instagram.com:443/rtmp/___my_key_here':
 Metadata:
   Server          : NGINX RTMP (github.com/arut/nginx-rtmp-module)
   displayWidth    : 1280
   displayHeight   : 720
   fps             : 30
   profile         :
   level           :
   encoder         : Lavf58.11.101
   Stream #0:0: Video: h264 (libx264) ([7][0][0][0] / 0x0007), yuv420p, 480x854 [SAR 1281:1280 DAR 9:16], q=-1--1, 2000 kb/s, 30 fps, 1k tbn, 30 tbc
   Metadata:
     encoder         : Lavc58.17.100 libx264
   Side data:
     cpb: bitrate max/min/avg: 3000000/0/2000000 buffer size: 3200000 vbv_delay: -1
   Stream #0:1: Audio: mp3 (libmp3lame) ([2][0][0][0] / 0x0002), 48000 Hz, stereo, fltp
   Metadata:
     encoder         : Lavc58.17.100 libmp3lame
[tls @ 000001a25b642e40] Error in the push function.
av_interleaved_write_frame(): I/O error
   Last message repeated 1 times
[flv @ 000001a25bc4db80] Failed to update header with correct duration.
[flv @ 000001a25bc4db80] Failed to update header with correct filesize.
Error writing trailer of rtmps://live-upload.instagram.com:443/rtmp/___my_key_here__: I/O error
frame=   62 fps=0.0 q=11.0 Lsize=     265kB time=00:00:07.05 bitrate= 307.2kbits/s speed=17.1x
video:175kB audio:111kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
[tls @ 000001a25b642e40] The specified session has been invalidated for some reason.
   Last message repeated 1 times
[libx264 @ 000001a25ad8e6c0] frame I:1     Avg QP:14.37  size: 12215
[libx264 @ 000001a25ad8e6c0] frame P:16    Avg QP:14.39  size: 13130
[libx264 @ 000001a25ad8e6c0] frame B:45    Avg QP:15.80  size:  4828
[libx264 @ 000001a25ad8e6c0] consecutive B-frames:  3.2%  0.0%  0.0% 96.8%
[libx264 @ 000001a25ad8e6c0] mb I  I16..4: 52.2% 22.7% 25.1%
[libx264 @ 000001a25ad8e6c0] mb P  I16..4:  0.2%  0.6%  0.7%  P16..4: 48.7%  0.0%  0.0%  0.0%  0.0%    skip:49.8%
[libx264 @ 000001a25ad8e6c0] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8: 16.1%  0.0%  0.0%  direct:21.1%  skip:62.7%  L0:38.2% L1:50.0% BI:11.8%
[libx264 @ 000001a25ad8e6c0] final ratefactor: 16.75
[libx264 @ 000001a25ad8e6c0] 8x8 transform intra:26.5% inter:48.4%
[libx264 @ 000001a25ad8e6c0] coded y,uvDC,uvAC intra: 58.0% 51.2% 38.8% inter: 22.3% 27.8% 13.6%
[libx264 @ 000001a25ad8e6c0] i16 v,h,dc,p: 95%  2%  2%  1%
[libx264 @ 000001a25ad8e6c0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 60%  4%  9%  2%  4%  9%  2%  6%  4%
[libx264 @ 000001a25ad8e6c0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 51%  8% 11%  5%  4%  9%  2%  7%  3%
[libx264 @ 000001a25ad8e6c0] i8c dc,h,v,p: 65%  8% 21%  6%
[libx264 @ 000001a25ad8e6c0] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 000001a25ad8e6c0] kb/s:1701.52
Conversion failed!


  


• How to save a vvideo from a RTSP server using Ffmpeg in C++ ?

  20 septembre 2021, par Tolga

  I am using Ffmpeg remuxing example code to save a mp4 file into another file. However my actual goal is saving the video from a RTSP server. The example works fine with the normal .mp4 files but when I try to save the video from RTSP Server I get following error on command prompt.

  


  [mp4 @ 02F9A8C0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 18000 >= 3000


  


  The RTSP server is created on my computer for testing using python gstream. I used the script here.

  


  Ffmpeg code in C++ is below where error occurs.

  


          iCamera->stream = iCamera->fmt->streams[iCamera->pkt->stream_index];
        iCamera->pkt->stream_index = map->stream_map[iCamera->pkt->stream_index];
        oCamera->stream = oCamera->fmt->streams[iCamera->pkt->stream_index];

        iCamera->pkt->pts = av_rescale_q_rnd(iCamera->pkt->pts, iCamera->stream->time_base, oCamera->stream->time_base, AVRounding(AV_ROUND_NEAR_INF | AV_ROUND_PASS_MINMAX));
        iCamera->pkt->dts = av_rescale_q_rnd(iCamera->pkt->dts, iCamera->stream->time_base, oCamera->stream->time_base, AVRounding(AV_ROUND_NEAR_INF | AV_ROUND_PASS_MINMAX));
        iCamera->pkt->duration = av_rescale_q(iCamera->pkt->duration, iCamera->stream->time_base, oCamera->stream->time_base);
        iCamera->pkt->pos = -1;
        
        if (av_interleaved_write_frame(oCamera->fmt, iCamera->pkt)) {
            printf("Error occured while muxing packet.\n"); exit(1);
        }