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• how to change the resolution FFMPEG live streaming to youtube

  15 juillet 2021, par StudyFromHome

  i use this code to live stream using my VPS in ffmpeg

  


  
#! /bin/bash
#


VBR="2500k"                                   
FPS="60"                                       
QUAL="ultrafast"                                  
YOUTUBE_URL="rtmp://a.rtmp.youtube.com/live2"  

SOURCE="/home/rsa-key/2222.mp4"             
KEY="ddf-khyf-dres-ek42-8sss"                                     

ffmpeg \
    -stream_loop -1 -i "$SOURCE" -deinterlace \
    -vcodec libx264 -pix_fmt yuv420p -preset $QUAL -r $FPS -g $(($FPS * 2)) -b:v $VBR \
    -acodec libmp3lame -ar 44100 -threads 6 -qscale 3 -b:a 712000 -bufsize 512k \
    -f flv "$YOUTUBE_URL/$KEY"  



  


  how i change the resolution limit like 480p

  


• How to mux live h264 stream in AnnexB nal unit format to flv container

  19 mai 2016, par Zhou Yufeng

  I have an Android device, which will send raw live H264 AnnexB NAL unit stream like [0,0,0,1,103,...][0,0,0,104,...][0,0,0,101,...][0,0,0,1,65,...][0,0,0,1,65,...] and try to mux them into flv container and send it to nginx-with rtmp module use libavformat of ffmpeg.

  If I save the received live stream to a local file, say test.h264. I can mux it to server OK using ffmpeg command "ffmpeg -i test.h264 -f flv rtmp ://my/server/url". But I don’t known how to handle live stream.

  I noticed ffmpeg/libavformat/avc.c have 2 functions that seem achieve my goal.
  But I’m not sure.

  Here is the code of ffmpeg

  int ff_avc_parse_nal_units(AVIOContext *pb, const uint8_t *buf_in, int size)
  
  {
  
      const uint8_t *p = buf_in;
  
      const uint8_t *end = p + size;
  
      const uint8_t *nal_start, *nal_end;
  
  
  
      size = 0;
  
      nal_start = ff_avc_find_startcode(p, end);
  
      for (;;) {
  
          while (nal_start < end && !*(nal_start++));
  
          if (nal_start == end)
  
              break;
  
  
  
          nal_end = ff_avc_find_startcode(nal_start, end);
  
          avio_wb32(pb, nal_end - nal_start);
  
          avio_write(pb, nal_start, nal_end - nal_start);
  
          size += 4 + nal_end - nal_start;
  
          nal_start = nal_end;
  
      }
  
      return size;
  
  }
  
  
  
  int ff_avc_parse_nal_units_buf(const uint8_t *buf_in, uint8_t **buf, int *size)
  
  {
  
      AVIOContext *pb;
  
      int ret = avio_open_dyn_buf(&pb);
  
      if(ret < 0)
  
          return ret;
  
  
  
      ff_avc_parse_nal_units(pb, buf_in, *size);
  
  
  
      av_freep(buf);
  
      *size = avio_close_dyn_buf(pb, buf);
  
      return 0;
  
  }

  Any useful reply are appreciated.

  Thank you !

• FFmpeg - Concat videos with different time base

  21 janvier 2017, par Xys

  I’m trying to concat videos with the concat demuxer, but it does not work when using one video ("video2.mp4" below). By does not work, I mean playing the concatenated video on a player will work until the second video part starts (it just cannot read the video anymore). It works with the concat filter though. They are both mp4 videos, so I think it’s because of the time base ? I can concat other videos with the concat demuxer and it works fine (even with different resolutions/bitrate). It only happens when trying to concat "video2.mp4".

  Also, I have a lot of warning/errors like this, probably when ffmpeg starts concatenating the 2nd video :

  [mp4 @ 0x7f847a814800] Non-monotonous DTS in output stream 0:0; previous: 906906, current: 302359; changing to 906907. This may result in incorrect timestamps in the output file.

  What would be the best way to have a minimum concat time ? Do I really need to use the concat filter or can I change the time base of "video1.mp4" if it’s really the problem ?

  Any help would be appreciated, thanks !

  Video 1 :

  ffprobe version 3.2.2 Copyright (c) 2007-2016 the FFmpeg developers
  
    built with Apple LLVM version 8.0.0 (clang-800.0.42.1)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/3.2.2 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-libmp3lame --enable-libx264 --enable-libxvid --enable-opencl --disable-lzma --enable-vda
  
    libavutil      55. 34.100 / 55. 34.100
  
    libavcodec     57. 64.101 / 57. 64.101
  
    libavformat    57. 56.100 / 57. 56.100
  
    libavdevice    57.  1.100 / 57.  1.100
  
    libavfilter     6. 65.100 /  6. 65.100
  
    libavresample   3.  1.  0 /  3.  1.  0
  
    libswscale      4.  2.100 /  4.  2.100
  
    libswresample   2.  3.100 /  2.  3.100
  
    libpostproc    54.  1.100 / 54.  1.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video1.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: isommp42
  
      creation_time   : 2016-08-17T22:50:35.000000Z
  
    Duration: 00:00:10.11, start: 0.000000, bitrate: 38018 kb/s
  
      Stream #0:0(eng): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p, 1696x848, 37832 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 180k tbc (default)
  
      Metadata:
  
        creation_time   : 2016-08-18T00:02:24.000000Z
  
        handler_name    : VideoHandle
  
      Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 189 kb/s (default)
  
      Metadata:
  
        creation_time   : 2016-08-18T00:02:24.000000Z
  
        handler_name    : SoundHandle 

  Video 2 :

  ffprobe version 3.2.2 Copyright (c) 2007-2016 the FFmpeg developers
  
    built with Apple LLVM version 8.0.0 (clang-800.0.42.1)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/3.2.2 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-libmp3lame --enable-libx264 --enable-libxvid --enable-opencl --disable-lzma --enable-vda
  
    libavutil      55. 34.100 / 55. 34.100
  
    libavcodec     57. 64.101 / 57. 64.101
  
    libavformat    57. 56.100 / 57. 56.100
  
    libavdevice    57.  1.100 / 57.  1.100
  
    libavfilter     6. 65.100 /  6. 65.100
  
    libavresample   3.  1.  0 /  3.  1.  0
  
    libswscale      4.  2.100 /  4.  2.100
  
    libswresample   2.  3.100 /  2.  3.100
  
    libpostproc    54.  1.100 / 54.  1.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video2.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: mp42mp41
  
      creation_time   : 2017-01-06T22:30:23.000000Z
  
    Duration: 00:00:08.19, start: 0.000000, bitrate: 101474 kb/s
  
      Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 4096x2048 [SAR 1:1 DAR 2:1], 101549 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
  
      Metadata:
  
        creation_time   : 2017-01-06T22:30:23.000000Z
  
        handler_name    : ?Mainconcept Video Media Handler
  
        encoder         : AVC Coding
  
      Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 125 kb/s (default)
  
      Metadata:
  
        creation_time   : 2017-01-06T22:30:23.000000Z
  
        handler_name    : #Mainconcept MP4 Sound Media Handler 

  FFMpeg Command :

  ffmpeg -f concat -safe 0 -i concat.txt -c copy result.mp4

  concat.txt :

  file '/path/to/video1.mp4'
  
  file '/path/to/video2.mp4' 

  Command result :

  ffmpeg version 3.2.2 Copyright (c) 2000-2016 the FFmpeg developers
  
    built with Apple LLVM version 8.0.0 (clang-800.0.42.1)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/3.2.2 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-libmp3lame --enable-libx264 --enable-libxvid --enable-opencl --disable-lzma --enable-vda
  
    libavutil      55. 34.100 / 55. 34.100
  
    libavcodec     57. 64.101 / 57. 64.101
  
    libavformat    57. 56.100 / 57. 56.100
  
    libavdevice    57.  1.100 / 57.  1.100
  
    libavfilter     6. 65.100 /  6. 65.100
  
    libavresample   3.  1.  0 /  3.  1.  0
  
    libswscale      4.  2.100 /  4.  2.100
  
    libswresample   2.  3.100 /  2.  3.100
  
    libpostproc    54.  1.100 / 54.  1.100
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fbd8b808c00] Auto-inserting h264_mp4toannexb bitstream filter
  
  Input #0, concat, from 'concat.txt':
  
    Duration: N/A, start: 0.000000, bitrate: 38021 kb/s
  
      Stream #0:0(eng): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p, 1696x848, 37832 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 180k tbc
  
      Metadata:
  
        creation_time   : 2016-08-18T00:02:24.000000Z
  
        handler_name    : VideoHandle
  
      Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 189 kb/s
  
      Metadata:
  
        creation_time   : 2016-08-18T00:02:24.000000Z
  
        handler_name    : SoundHandle
  
  Output #0, mp4, to 'result.mp4':
  
    Metadata:
  
      encoder         : Lavf57.56.100
  
      Stream #0:0(eng): Video: h264 (Baseline) ([33][0][0][0] / 0x0021), yuv420p, 1696x848, q=2-31, 37832 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 90k tbc
  
      Metadata:
  
        creation_time   : 2016-08-18T00:02:24.000000Z
  
        handler_name    : VideoHandle
  
      Stream #0:1(eng): Audio: aac (LC) ([64][0][0][0] / 0x0040), 48000 Hz, stereo, 189 kb/s
  
      Metadata:
  
        creation_time   : 2016-08-18T00:02:24.000000Z
  
        handler_name    : SoundHandle
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:1 -> #0:1 (copy) 
  
  Press [q] to stop, [?] for help
  
  frame=  112 fps=0.0 q=-1.0 size=   12701kB time=00:00:03.70 bitrate=28092.2kbits/s speed= 7.4x
  
  frame=  151 fps=151 q=-1.0 size=   18853kB time=00:00:05.00 bitrate=30857.5kbits/s speed=   5x
  
  frame=  224 fps=149 q=-1.0 size=   30042kB time=00:00:07.44 bitrate=33074.8kbits/s speed=4.95x
  
  frame=  268 fps=134 q=-1.0 size=   36596kB time=00:00:08.90 bitrate=33650.8kbits/s speed=4.44x
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fbd8a808000] Auto-inserting h264_mp4toannexb bitstream filter.9x 
  
  [mp4 @ 0xb545d000] Non-monotonous DTS in output stream 0:1; previous: 484352, current: 445939; changing to 484353. This may result in incorrect timestamps in the output file.
  
  [concat @ 0xb545c400] DTS 304057 < 906906 out of order
  
  [mp4 @ 0xb545d000] Non-monotonous DTS in output stream 0:0; previous: 906906, current: 304057; changing to 906907. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0xb545d000] Non-monotonous DTS in output stream 0:1; previous: 484353, current: 446963; changing to 484354. This may result in incorrect timestamps in the output file.
  
  ...
  
  ... like 100 DTS errors ...
  
  ...
  
  [mp4 @ 0xb545d000] Non-monotonous DTS in output stream 0:0; previous: 907150, current: 548301; changing to 907151. This may result in incorrect timestamps in the output file.
  
  frame=  548 fps=169 q=-1.0 Lsize=  148399kB time=00:00:18.28 bitrate=66493.7kbits/s speed=5.64x
  
  video:148027kB audio:359kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.008622%

  Thank you in advance !