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• How can i mux H264 stream into MP4 file via libavformat

  10 mars 2024, par Brian

  I want to realize an application that firstly decode a multi-media file(such as test.mp4 file, video codec id is H264), get a video stream and an audio stream, then make some different in the audio stream, at last encode the video stream(use libx264) and audio stream into a result file(result.mp4). To promote the efficiency, i omitted the decode and encode of video stream, i get the video packet via function "av_read_frame", then output it directly into the result file via function "av_write_frame". But there is no picture in the output file, and the size of output file is fairly small.

  



  I tracked the ffmpeg code and found that in the function "av_write_frame->mov_write_packet->ff_mov_write_packet", it will call function "ff_avc_parse_nal_units" to obtain the size of nal unit, but the return value is very small(such as 208 bytes).

  



  I find that the H264 stream in the MP4 file is not stored in Annex-B format, so it can't find start code(0x000001）， now my problem is how can I change the H264 stream to Annex-B format, and make it work ?
I added start code at the beginning of every frame manually, but it still not work.

  



  Anyone can give me any hint ?Thanks very much.
Following is the codes similar with my :

  



      // write the stream header, if any
    av_write_header(pFormatCtxEnc);

    .........
    /**
    * Init of Encoder and Decoder
    */

    bool KeyFlag = false;
    bool KeyFlagEx = false;
    // Read frames and save frames to disk
    int iPts = 1;
    av_init_packet(&packet);
    while(av_read_frame(pFormatCtxDec, &packet)>=0)
    {
            if (packet.flags == 1)
                    KeyFlag = true;

            if (!KeyFlag)
                    continue;

            if (m_bStop)
            {
                    break;
            }

            // Is this a packet from the video stream?
            if(packet.stream_index == videoStream)
            {
                    currentframeNum ++;
                    if (progressCB != NULL && currentframeNum%20 == 0)
                    {
                            float fpercent = (float)currentframeNum/frameNum;
                            progressCB(fpercent,m_pUser);
                    }

                    if (currentframeNum >= beginFrame && currentframeNum <= endFrane)
                    {
                            if (packet.flags == 1)
                                    KeyFlagEx = true;

                            if (!KeyFlagEx)
                                    continue;
                            packet.dts = iPts ++;
                            av_write_frame(pFormatCtxEnc, &packet);

                    }
            }
            // Free the packet that was allocated by av_read_frame
    }

    // write the trailer, if any
    av_write_trailer(pFormatCtxEnc);

    /**
    * Release of encoder and decoder
    */

    return true;


  


• ffmpeg error SSL routines:ssl3_write_pending:bad write retry

  6 mai 2019, par boygiandi

  Recently, I see this error very often. Does anyone know what the error is and how to fix ? Please check full ffmpeg output here ( I already update openssl latest version from yum )

  ffmpeg version N-93715-gd0e4d04 Copyright (c) 2000-2019 the FFmpeg developers
  
    built with gcc 4.8.5 (GCC) 20150623 (Red Hat 4.8.5-36)
  
    configuration: --prefix= ....
  
  Input #0, mpegts, from '/tmp/4028813_video_0.ts':
  
    Duration: 00:04:08.19, start: 1.410111, bitrate: 1504 kb/s
  
    Program 1
  
      Metadata:
  
        service_name    : Service01
  
        service_provider: FFmpeg
  
      Stream #0:0[0x100]: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p(tv, bt709, progressive), 608x1080 [SAR 1:1 DAR 76:135], 30 fps, 30 tbr, 90k tbn, 60 tbc
  
      Stream #0:1[0x101](eng): Audio: aac (LC) ([15][0][0][0] / 0x000F), 44100 Hz, stereo, fltp, 121 kb/s
  
  [ sh: 2019-05-06  9:39:46 ]
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:1 -> #0:1 (aac (native) -> aac (native))
  
  Press [q] to stop, [?] for help
  
  Output #0, flv, to 'rtmps://live-api-s.facebook.com:443/rtmp/289693778580218?s_bl=1&s_sw=0&s_vt=api-s&a=Abxj1aU9OTqh0RtS':
  
    Metadata:
  
      comment         : gs4028813
  
      encoder         : Lavf58.27.103
  
      Stream #0:0: Video: h264 (High) ([7][0][0][0] / 0x0007), yuv420p(tv, bt709, progressive), 608x1080 [SAR 1:1 DAR 76:135], q=2-31, 3000 kb/s, 30 fps, 30 tbr, 1k tbn, 30 tbc
  
      Stream #0:1(eng): Audio: aac (LC) ([10][0][0][0] / 0x000A), 44100 Hz, stereo, fltp, 128 kb/s
  
      Metadata:
  
        encoder         : Lavc58.52.100 aac
  
  [ sh: 2019-05-06  9:39:47 ]size=     169kB time=00:00:00.52 bitrate=2643.9kbits/s speed=1.03x
  
  ......
  
  [ sh: 2019-05-06  9:40:10 ]size=    3386kB time=00:00:22.72 bitrate=1220.7kbits/s speed=0.999x
  
  [ sh: 2019-05-06  9:40:11 ]size=    3842kB time=00:00:25.32 bitrate=1242.9kbits/s speed=   1x
  
  [tls @ 0x30ab3c0] error:00000000:lib(0):func(0):reason(0)82 bitrate=1247.3kbits/s speed=   1x
  
  av_interleaved_write_frame(): Input/output error
  
  [flv @ 0x3030f80] Failed to update header with correct duration.
  
  [flv @ 0x3030f80] Failed to update header with correct filesize.
  
  Error writing trailer of rtmps://live-api-s.facebook.com:443/rtmp/289693778580218?s_bl=1&s_sw=0&s_vt=api-s&a=Abxj1aU9OTqh0RtS: Input/output error
  
  frame=  776 fps= 30 q=-1.0 Lsize=    3932kB time=00:00:25.82 bitrate=1247.3kbits/s speed=   1x
  
  video:3530kB audio:406kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
  
  [tls @ 0x30ab3c0] error:1409F07F:SSL routines:ssl3_write_pending:bad write retry

• Broadcast webcamer over ffserver and ffmpeg

  8 février 2019, par AkBako

  I setup the ffserver on Ubuntu 16.04 UPU. I did some streami from a .webm video fileы to the site. Now I can’t start streaming from the webcam of my laptop and show it on the website. Please need help.

  Technical info :

  Client-site:Windows 10

  WebCamera : YUV 4:2:2 640x480 fps 30.0

  Server-site : VPS Server Ubuntu 16.04

  ffserver.conf

  HTTPPort 8090
  
  HTTPBindAddress 0.0.0.0
  
  MaxHTTPConnections 2000
  
  MaxClients 1000
  
  MaxBandwidth 500000
  
  CustomLog -
  
  NoDaemon
  
  RTSPPort 7654
  
  RTSPBindAddress 0.0.0.0
  
  <feed>               # This is the input feed where FFmpeg will send
  
     File ./feed1.ffm            # video stream.
  
     FileMaxSize 1G              # Maximum file size for buffering video
  
  </feed>
  
  
  
  <stream>
  
      Feed feed1.ffm
  
      Format webm
  
      # Audio settings
  
      AudioCodec vorbis
  
      AudioBitRate 64             # Audio bitrate
  
  
  
      # Video settings
  
      VideoCodec libvpx
  
      VideoSize 640x480          # Video resolution
  
      VideoFrameRate 30           # Video FPS
  
      AVOptionVideo flags +global_header  # Parameters passed to encoder
  
                                         # (same as ffmpeg command-line parameters)
  
      AVOptionVideo cpu-used 0
  
      AVOptionVideo qmin 10
  
      AVOptionVideo qmax 42
  
      AVOptionVideo quality good
  
      AVOptionAudio flags +global_header
  
      PreRoll 15
  
      StartSendOnKey
  
      VideoBitRate 400 
  
  </stream>
  
  
  
  <stream>
  
    Format status
  
    # Only allow local people to get the status
  
    ACL allow localhost
  
    ACL allow 192.168.0.0 192.168.255.255
  
  </stream>
  
  
  
  <redirect>    # Just an URL redirect for index
  
     # Redirect index.html to the appropriate site
  
     URL http://XX.XXX.XXX.XXX
  
  </redirect>

  Run code on Windows :

  ffmpeg -f dshow -i video="USB2.0 HD UVC WebCam" -video_size 640x480 -rtbufsize 702000k -framerate 30 -pixel_format yuyv422 -f mpegts http://XXX.XXX.XX.XX:8090/feed1.ffm

  Error message on Windows :

  Input #0, dshow, from 'video=USB2.0 HD UVC WebCam':
  
    Duration: N/A, start: 5326.566000, bitrate: N/A
  
      Stream #0:0: Video: mjpeg (Baseline) (MJPG / 0x47504A4D), yuvj422p(pc, bt470bg/unknown/unknown), 1280x720, 30 fps, 30 tbr, 10000k tbn, 10000k tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (mjpeg (native) -> mpeg2video (native))
  
  Press [q] to stop, [?] for help
  
  [swscaler @ 06e5a000] deprecated pixel format used, make sure you did set range correctly
  
  Output #0, mpegts, to 'http://95.183.11.180:8090/feed1.ffm':
  
    Metadata:
  
      encoder         : Lavf58.24.101
  
      Stream #0:0: Video: mpeg2video (4:2:2), yuv422p, 1280x720, q=2-31, 200 kb/s, 30 fps, 90k tbn, 30 tbc
  
      Metadata:
  
        encoder         : Lavc58.42.103 mpeg2video
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1
  
  av_interleaved_write_frame(): Unknown error
  
  Error writing trailer of http://95.183.11.180:8090/feed1.ffm: Error number -10054 occurred
  
  frame=    3 fps=0.0 q=1.6 Lsize=      46kB time=00:00:00.00 bitrate=34318545.5kbits/s speed=9.07e-05x
  
  video:84kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
  
  [http @ 06dd5c00] URL read error:  -10054
  
  Conversion failed!

  FFserver log :

  Fri Feb  8 03:14:58 2019 178.88.140.182 - - [POST] "/feed1.ffm HTTP/1.1" 200 4096