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• ffmpeg image concat file with different file extensions

  4 juillet 2018, par Rich

  I’ve been working with ffmpeg and I have got it to work perfectly quite a few times, but as of recent I am running into an issue where all the images from my text file arent used.

  My text file looks like -

  ffconcat version 1.0
  
  file 'gallery-house-77-west-55th-street-01.jpg'
  
  duration 4.44
  
  file 'img03.jpg'
  
  duration 4.44
  
  file 'inside.png'
  
  duration 4.44
  
  file 'placeholder.png'

  (amount of files, file names and extensions will always vary)

  And I’ve tried several combinations but as of now my ffmpeg function looks like —

  ffmpeg -i audio.mp3 -safe 0 -f concat -i paths.txt -c:a copy -c:v libx264 \
  
  -vf "scale=1280:720:force_original_aspect_ratio=decrease,pad=1280:720:(ow-iw)/2:(oh-ih)/2,fps=25,format=yuv420p" -vsync vfr -movflags +faststart -y output.mp4 2>&1');

  When trying to run it, the video seems to convert but has various weird behaviors - sometimes only the middle file(image) in the list is shown or the first 2 only are shown/rendered.

  The audio is playing correctly though.

  I’ve tried setting the framerate for the input and I also tried setting it for the output but it leads to more strange behavior.

  This is what is echoed when running my above ffmpeg command -

   libavutil      56. 15.100 / 56. 15.100
  
    libavcodec     58. 19.100 / 58. 19.100
  
    libavformat    58. 13.100 / 58. 13.100
  
    libavdevice    58.  4.100 / 58.  4.100
  
    libavfilter     7. 18.100 /  7. 18.100
  
    libswscale      5.  2.100 /  5.  2.100
  
    libswresample   3.  2.100 /  3.  2.100
  
    libpostproc    55.  2.100 / 55.  2.100
  
  [mp3 @ 0xb46780] Estimating duration from bitrate, this may be inaccurate
  
  Input #0, mp3, from 'audio.mp3':
  
    Metadata:
  
      encoder         : Lavf57.71.100
  
    Duration: 00:00:19.98, start: 0.000000, bitrate: 48 kb/s
  
      Stream #0:0: Audio: mp3, 22050 Hz, mono, fltp, 48 kb/s
  
  Input #1, concat, from 'paths.txt':
  
    Duration: N/A, start: 0.000000, bitrate: N/A
  
      Stream #1:0: Video: mjpeg, yuvj444p(pc, bt470bg/unknown/unknown), 754x424 [SAR 72:72 DAR 377:212], 25 tbr, 25 tbn, 25 tbc
  
  Stream mapping:
  
    Stream #1:0 -> #0:0 (mjpeg (native) -> h264 (libx264))
  
    Stream #0:0 -> #0:1 (copy)
  
  Press [q] to stop, [?] for help
  
  [swscaler @ 0xba25c0] deprecated pixel format used, make sure you did set range correctly
  
  [libx264 @ 0xb710c0] using SAR=3393/3392
  
  [libx264 @ 0xb710c0] using cpu capabilities: none!
  
  [libx264 @ 0xb710c0] profile High, level 3.1
  
  [libx264 @ 0xb710c0] 264 - core 155 r2901 7d0ff22 - H.264/MPEG-4 AVC codec - Copyleft 2003-2018 - 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=22 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=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 'output.mp4':
  
    Metadata:
  
      encoder         : Lavf58.13.100
  
      Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 3393:3392 DAR 377:212], q=-1--1, 25 fps, 12800 tbn, 25 tbc
  
      Metadata:
  
        encoder         : Lavc58.19.100 libx264
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
  
      Stream #0:1: Audio: mp3 (mp4a / 0x6134706D), 22050 Hz, mono, fltp, 48 kb/s
  
  [swscaler @ 0xb93140] deprecated pixel format used, make sure you did set range correctly
  
  [swscaler @ 0xb93140] Warning: data is not aligned! This can lead to a speed loss
  
  [mjpeg @ 0xb6e200] mjpeg: unsupported coding type (cd)
  
  [mjpeg @ 0xb6e200] mjpeg: unsupported coding type (c8)
  
  [mjpeg @ 0xb6e200] Found EOI before any SOF, ignoring
  
  [mjpeg @ 0xb6e200] mjpeg: unsupported coding type (c7)
  
  Error while decoding stream #1:0: Invalid data found when processing input
  
  [mjpeg @ 0xb6e200] invalid id 94
  
  Error while decoding stream #1:0: Invalid data found when processing input
  
  [mp4 @ 0xb6f8c0] Starting second pass: moving the moov atom to the beginning of the file
  
  frame=    1 fps=0.0 q=28.0 Lsize=     179kB time=00:00:19.95 bitrate=  73.6kbits/s speed=44.1x    
  
  video:58kB audio:117kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 2.446521%
  
  [libx264 @ 0xb710c0] frame I:1     Avg QP:28.86  size: 58683
  
  [libx264 @ 0xb710c0] mb I  I16..4: 21.2% 59.8% 19.0%
  
  [libx264 @ 0xb710c0] 8x8 transform intra:59.8%
  
  [libx264 @ 0xb710c0] coded y,uvDC,uvAC intra: 50.5% 65.2% 31.6%
  
  [libx264 @ 0xb710c0] i16 v,h,dc,p: 10% 60%  3% 28%
  
  [libx264 @ 0xb710c0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 20% 27% 26%  4%  4%  4%  6%  4%  7%
  
  [libx264 @ 0xb710c0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 20% 33% 10%  5%  6%  5%  8%  5%  7%
  
  [libx264 @ 0xb710c0] i8c dc,h,v,p: 47% 34% 11%  8%
  
  [libx264 @ 0xb710c0] kb/s:11736.60

  Any ideas whats causing the image sequence to fail ?

  EDIT

  After some more debugging I think it may be related to the fact that all the files dont have the same extension. How can I make it so that it doesn’t have to be that way or is that already a default setting and the issue is else where ?

  EDIT 2

  I can get it to work when all the image extensions are the same but when it gets to png or any other image extension it renders the movie but the movie stops (incomplete) when it gets to that frame. This happens when I -
  1. place all the jpgs before the png
  2. run the following command ----

  ffmpeg -safe 0 -f concat -i paths.txt -c:v libx264 \
  
  -vf "scale=1280:720:force_original_aspect_ratio=decrease,pad=1280:720:(ow-iw)/2:(oh-ih)/2" -pix_fmt yuv420p -movflags +faststart -y output.mp4 2>&1

  So my last guess may be correct and it’s because I am mixing multiple image extensions in my ffmpeg command.

  How can I correct it so that it allows a mix of any image files ?

• Using ffmpeg to generate multiple resolutions with the exact same keyframe positions

  2 novembre 2014, par bacon overlord

  There are a bunch of resources on how to use ffmpeg to convert X to Y and so forth but I can’t seem to be able to generate different resolutions of the same file with the same keyframe and frame positions.

  The keyframe positions are important because they allow the player to jump from one bitrate to another.

  These videos are intended for Flash.

  I keep on getting results like this from the validation tool.

  failed on frame 1670
  
  [FrameInfo 1670, type 9, timecode 23565, seekable 1670]
  
  [FrameInfo 1670, type 9, timecode 23565, seekable 1525]

  Even worse, sometimes it takes to re-ordering the frames

  failed on frame 1
  
  [FrameInfo 1, type 9, timecode 0, seekable 1]
  
  [FrameInfo 1, type 8, timecode 0, seekable -1]

  When trying to validate the sample videos that are installed with Adobe Flash Media Server they are ok

  Comparing files
  
  0: G:\VOD\sample1_150kbps.flv
  
  1: G:\VOD\sample1_500kbps.flv
  
  2: G:\VOD\sample1_700kbps.flv
  
  3: G:\VOD\sample1_1500kbps.flv
  
  Index, Keyframes, and Timecodes are Validated across all files

  Sample ffmpeg command I run at different resolutions. Adobe Media Encoder is also producing video with different keyframe positions so I don’t know whats going on here.

  ffmpeg -i source.mp4 -vf scale=1270:720 -c:a copy output.flv

  ffmpeg 720p

  ffmpeg -i .\big_buck_bunny_1080p_surround.avi -vf scale=1280:720 -vcodec libx264 -profile:v main -acodec libvo_aacenc -b:a 128k -ac 2  big_buck_bunny_720.flv

  ffmpeg 480p

  ffmpeg -i .\big_buck_bunny_1080p_surround.avi -vf scale=854:480 -vcodec libx264 -profile:v main -acodec libvo_aacenc -b:a 128k -ac 2  big_buck_bunny_480.flv

  ffmpeg console output

  ffmpeg version N-59433-g4aa9c91 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Dec 29 2013 22:01:53 with gcc 4.8.2 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfi
  
  g --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetyp
  
  e --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopenco
  
  re-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libsp
  
  eex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-li
  
  bvorbis --enable-libvpx --enable-libwavpack --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
  
    libavutil      52. 59.100 / 52. 59.100
  
    libavcodec     55. 47.100 / 55. 47.100
  
    libavformat    55. 22.100 / 55. 22.100
  
    libavdevice    55.  5.102 / 55.  5.102
  
    libavfilter     4.  0.103 /  4.  0.103
  
    libswscale      2.  5.101 /  2.  5.101
  
    libswresample   0. 17.104 /  0. 17.104
  
    libpostproc    52.  3.100 / 52.  3.100
  
  Input #0, avi, from '.\big_buck_bunny_1080p_surround.avi':
  
    Metadata:
  
      encoder         : AVI-Mux GUI 1.17.7, Aug  8 2006  20:59:17
  
      JUNK            :
  
    Duration: 00:09:56.46, start: 0.000000, bitrate: 12455 kb/s
  
      Stream #0:0: Video: mpeg4 (Simple Profile) (FMP4 / 0x34504D46), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 24 tbr, 24 tb
  
  n, 24 tbc
  
      Stream #0:1: Audio: ac3 ([0] [0][0] / 0x2000), 48000 Hz, 5.1(side), fltp, 448 kb/s
  
  File 'big_buck_bunny_720.flv' already exists. Overwrite ? [y/N] Y
  
  [libx264 @ 029deec0] using SAR=1/1
  
  [libx264 @ 029deec0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
  
  [libx264 @ 029deec0] profile Main, level 3.1
  
  [libx264 @ 029deec0] 264 - core 140 r2377 1ca7bb9 - H.264/MPEG-4 AVC codec - Copyleft 2003-2013 - http://www.videolan.or
  
  g/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x1:0x111 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 m
  
  e_range=16 chroma_me=1 trellis=1 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=12 lookahead_thr
  
  eads=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=24 scenecut=40 intra_refresh=0 rc_lookahead=40 r
  
  c=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, flv, to 'big_buck_bunny_720.flv':
  
    Metadata:
  
      JUNK            :
  
      encoder         : Lavf55.22.100
  
      Stream #0:0: Video: h264 (libx264) ([7][0][0][0] / 0x0007), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], q=-1--1, 1k tbn, 2
  
  4 tbc
  
      Stream #0:1: Audio: aac (libvo_aacenc) ([10][0][0][0] / 0x000A), 48000 Hz, stereo, s16, 128 kb/s
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (mpeg4 -> libx264)
  
    Stream #0:1 -> #0:1 (ac3 -> libvo_aacenc)
  
  Press [q] to stop, [?] for help
  
  frame=14315 fps= 73 q=-1.0 Lsize=  120952kB time=00:09:56.49 bitrate=1661.1kbits/s
  
  video:110887kB audio:9321kB subtitle:0 global headers:0kB muxing overhead 0.619082%
  
  [libx264 @ 029deec0] frame I:151   Avg QP:17.09  size:115286
  
  [libx264 @ 029deec0] frame P:5374  Avg QP:21.41  size: 14154
  
  [libx264 @ 029deec0] frame B:8790  Avg QP:25.91  size:  2284
  
  [libx264 @ 029deec0] consecutive B-frames: 11.5% 15.5% 13.3% 59.7%
  
  [libx264 @ 029deec0] mb I  I16..4: 24.0%  0.0% 76.0%
  
  [libx264 @ 029deec0] mb P  I16..4:  4.0%  0.0%  3.5%  P16..4: 29.3% 11.1%  7.1%  0.0%  0.0%    skip:45.1%
  
  [libx264 @ 029deec0] mb B  I16..4:  0.2%  0.0%  0.4%  B16..8: 22.4%  1.7%  0.4%  direct: 0.8%  skip:74.1%  L0:37.5% L1:5
  
  8.0% BI: 4.5%
  
  [libx264 @ 029deec0] coded y,uvDC,uvAC intra: 51.5% 64.4% 37.6% inter: 7.3% 10.1% 1.3%
  
  [libx264 @ 029deec0] i16 v,h,dc,p: 40% 23%  9% 28%
  
  [libx264 @ 029deec0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 23% 18% 15%  7%  8% 10%  7%  7%  6%
  
  [libx264 @ 029deec0] i8c dc,h,v,p: 51% 21% 17% 10%
  
  [libx264 @ 029deec0] Weighted P-Frames: Y:5.9% UV:3.6%
  
  [libx264 @ 029deec0] ref P L0: 62.4% 16.9% 15.2%  5.3%  0.1%
  
  [libx264 @ 029deec0] ref B L0: 89.3%  9.1%  1.7%
  
  [libx264 @ 029deec0] ref B L1: 94.3%  5.7%
  
  [libx264 @ 029deec0] kb/s:1522.96

  Validation Results

  Comparing files
  
  0: G:\VOD\big_buck_bunny_480.flv
  
  1: G:\VOD\big_buck_bunny_720.flv
  
  >> Comparison failed on frame 13181
  
  0: [FrameInfo 13181, type 9, timecode 185958, seekable 12794]
  
  1: [FrameInfo 13181, type 9, timecode 185958, seekable 13181]

• What to do when last_pts > current_pts using ffmpeg libs (C++)

  11 mars 2015, par Rafael Lucio

  Im having some hard time figuring out where to find about this..

  Im building a simple recorder to learn about this video compression universe and Im facing some weird behaviors..

  Before all I need to explain the scenario...

  Its very simple... everytime I call av_read_frame( input_context, input_packet ) I save the pts into the last_pts variable...

  So...

  Whats bothering me is the fact that about 10% of my calls to av_read_frame I get
  input_packet.pts > last_pts

  Resulting in a error message from the encoder when I try to do it...
  Having it in mind I decided to just drop those frames when it happens....

  I think it is not a good idea to just drop frames because if I get them, its needed somehow...

  So... what to do when last_pts > current_pts ?

  I will paste my test code that Im using capturing the video from webcam and saving to mp4 file with libx264 encoder

  #include <qcoreapplication>
  
  
  
  extern "C" {
  
  #include <libavcodec></libavcodec>avcodec.h>
  
  #include <libavformat></libavformat>avformat.h>
  
  #include <libswscale></libswscale>swscale.h>
  
  #include <libavutil></libavutil>avutil.h>
  
  #include <libavdevice></libavdevice>avdevice.h>
  
  }
  
  
  
  #include <qtime>
  
  #include <qthread>
  
  #include <qdebug>
  
  
  
  #define SM_DEBUG
  
  
  
  static const double max_fps = 30;
  
  static const double min_loop_duration = 1000 / max_fps;
  
  static const double max_duration = 5; // in seconds
  
  
  
  static void sleep_if_needed(const int &amp;elapsed) {
  
      int sleep_duration = min_loop_duration - elapsed;
  
  
  
      if (sleep_duration > 0)  {
  
          QThread::msleep(sleep_duration);
  
      }
  
  }
  
  
  
  #ifdef SM_DEBUG
  
  static void log_packet(const AVPacket *pkt,
  
                         const AVRational &amp;time_base,
  
                         int is_input=0)
  
  {
  
  
  
      qDebug() &lt;&lt; ((is_input) ? QString(">>") : QString("&lt;&lt;"))  &lt;&lt; "Size:" &lt;&lt; QString::number(pkt->size) &lt;&lt;
  
          "pts:" &lt;&lt; QString::number(pkt->pts) &lt;&lt;
  
          "pts_time:" &lt;&lt; QString::number(av_q2d(time_base) * pkt->pts) &lt;&lt;
  
          "dts:" &lt;&lt; QString::number(pkt->dts) &lt;&lt;
  
          "dts_time:" &lt;&lt; QString::number(av_q2d(time_base) * pkt->dts);
  
  }
  
  #endif
  
  
  
  int main()
  
  {
  
      int input_w, input_h, output_w = 640, output_h = 480;
  
  
  
      av_register_all();
  
      avdevice_register_all();
  
      avcodec_register_all();
  
  #ifdef SM_DEBUG
  
      av_log_set_level(AV_LOG_DEBUG);
  
  #else
  
      av_log_set_level(AV_LOG_ERROR);
  
  #endif
  
  
  
      AVFormatContext *ic;
  
      AVFormatContext *oc;
  
  
  
      AVInputFormat *ifmt;
  
  
  
      AVDictionary *opts = 0;
  
  
  
      AVCodecContext* dec_ctx;
  
      AVCodecContext* enc_ctx;
  
      AVCodec *dec;
  
      AVCodec *enc;
  
  
  
      AVStream* ist;
  
      AVStream* ost;
  
  
  
      ifmt = av_find_input_format("v4l2");
  
  
  
      av_dict_set(&amp;opts, "tune", "zerolatency", AV_DICT_APPEND);
  
      ic = avformat_alloc_context();
  
  
  
      ic->flags |= AVFMT_FLAG_NONBLOCK;
  
  
  
      avformat_open_input(&amp;ic, "/dev/video0", ifmt, &amp;opts);
  
  
  
      avformat_find_stream_info(ic, NULL);
  
  
  
      av_dump_format(ic, 0, ic->filename, 0);
  
  
  
      AVFrame *frame;
  
      AVFrame *tmp_frame;
  
  
  
      ist = ic->streams[0];
  
  
  
      dec_ctx =  ist->codec;
  
  
  
      input_w = dec_ctx->width;
  
      input_h = dec_ctx->height;
  
  
  
      dec_ctx->flags |= CODEC_FLAG_LOW_DELAY;
  
      dec = avcodec_find_decoder(dec_ctx->codec_id);
  
  
  
      av_format_set_video_codec(ic, dec);
  
      avcodec_open2(dec_ctx, dec, NULL);
  
  
  
      // output
  
  
  
      avformat_alloc_output_context2(&amp;oc, NULL, "MP4", "/home/poste9/grava.mp4");
  
  
  
      enc = avcodec_find_encoder(AV_CODEC_ID_H264);
  
      ost = avformat_new_stream(oc, enc);
  
      enc_ctx = ost->codec;
  
  
  
      enc_ctx->codec_id = AV_CODEC_ID_H264;
  
      enc_ctx->width = output_w;
  
      enc_ctx->height = output_h;
  
  
  
      ost->time_base.num = ist->time_base.num;
  
      ost->time_base.den = ist->time_base.den;
  
  
  
      enc_ctx->time_base = ost->time_base;
  
  
  
      enc_ctx->gop_size = 250;
  
      enc_ctx->keyint_min = 25;
  
      enc_ctx->qmax = 51;
  
      enc_ctx->qmin = 30;
  
      enc_ctx->pix_fmt = AV_PIX_FMT_YUV422P;
  
      enc_ctx->max_b_frames = 6;
  
      enc_ctx->flags |= CODEC_FLAG_GLOBAL_HEADER;
  
      enc_ctx->flags |= CODEC_FLAG_LOW_DELAY;
  
  
  
      avcodec_open2(enc_ctx, enc, NULL);
  
  
  
      avio_open2(&amp;oc->pb, oc->filename, AVIO_FLAG_WRITE,
  
                 &amp;oc->interrupt_callback, NULL);
  
  
  
      av_dump_format(oc, 0, oc->filename, 1);
  
  
  
      avformat_write_header(oc, NULL);
  
  
  
      struct SwsContext *sws_ctx;
  
  
  
      sws_ctx = sws_getContext(input_w, input_h,
  
                               dec_ctx->pix_fmt,
  
                               output_w, output_h, enc_ctx->pix_fmt,
  
                               SWS_BICUBIC, NULL, NULL, NULL);
  
  
  
      frame = av_frame_alloc();
  
      tmp_frame = av_frame_alloc();
  
  
  
      frame->format = enc_ctx->pix_fmt;
  
      frame->width = output_w;
  
      frame->height = output_h;
  
      frame->pts = AV_NOPTS_VALUE;
  
  
  
      av_frame_get_buffer(frame, 32);
  
      av_frame_make_writable(frame);
  
  
  
      int got_picture=0;
  
      int got_packet=0;
  
  
  
      double recording_duration = 0;
  
  
  
      QTime timer;
  
  
  
      AVPacket pkt_out;
  
  
  
      av_init_packet(&amp;pkt_out);
  
  
  
      timer.start();
  
  
  
      bool started_recording = false;
  
  
  
      int64_t start_time = 0;
  
  
  
      int64_t last_pts = INT64_MIN;
  
  
  
      while(1) {
  
          timer.restart();
  
          AVPacket pkt_in;
  
  
  
          av_read_frame(ic, &amp;pkt_in);
  
  
  
          if (pkt_in.size == 0) {
  
              sleep_if_needed(timer.elapsed());
  
              continue;
  
          }
  
  
  
          avcodec_decode_video2(dec_ctx, tmp_frame, &amp;got_picture, &amp;pkt_in);
  
  
  
  #ifdef SM_DEBUG
  
          log_packet(&amp;pkt_in, ist->time_base, 1);
  
  #endif
  
  
  
          if (!started_recording) {
  
  
  
              start_time = pkt_in.dts;
  
              started_recording = true;
  
          }
  
  
  
          if (pkt_in.pts &lt; last_pts) {
  
  
  
              sleep_if_needed(timer.elapsed());
  
  
  
              continue;
  
          }
  
  
  
          last_pts = pkt_in.pts;
  
  
  
          frame->pts = (pkt_in.dts - start_time);
  
  
  
          if (!got_picture) {
  
  
  
              av_free_packet(&amp;pkt_in);
  
  
  
              sleep_if_needed(timer.elapsed());
  
  
  
              continue;
  
          } else {
  
              sws_scale(sws_ctx, tmp_frame->data, tmp_frame->linesize,
  
                0, input_h, frame->data, frame->linesize);
  
  
  
              av_free_packet(&amp;pkt_in);
  
          }
  
  
  
          av_init_packet(&amp;pkt_out);
  
  
  
          avcodec_encode_video2(enc_ctx, &amp;pkt_out, frame, &amp;got_packet);
  
  
  
          if (got_packet) {
  
  
  
              if (pkt_out.pts &lt; pkt_out.dts) {
  
                  pkt_out.dts = pkt_out.pts;
  
              }
  
  
  
              pkt_out.stream_index = 0;
  
  
  
              recording_duration = pkt_out.pts * av_q2d(ost->time_base);
  
  #ifdef SM_DEBUG
  
              log_packet(&amp;pkt_out, ost->time_base, 0);
  
  #endif
  
  
  
              av_interleaved_write_frame(oc, &amp;pkt_out);
  
  
  
              av_free_packet(&amp;pkt_out);
  
          }
  
  
  
          if (recording_duration >= max_duration) {
  
  
  
              break;
  
  
  
          } else {
  
  
  
              sleep_if_needed(timer.elapsed());
  
          }
  
      }
  
  
  
      av_write_trailer(oc);
  
  
  
      av_dict_free(&amp;opts);
  
  
  
      av_frame_free(&amp;frame);
  
      av_frame_free(&amp;tmp_frame);
  
  
  
      sws_freeContext(sws_ctx);
  
  
  
      avcodec_close(dec_ctx);
  
      avcodec_close(enc_ctx);
  
  
  
      avio_close(oc->pb);
  
      avformat_free_context(oc);
  
  
  
      avformat_close_input(&amp;ic);
  
  
  
      return 0;
  
  }
  
  </qdebug></qthread></qtime></qcoreapplication>