Recherche avancée

Sur d’autres sites (10090)

• Unable to encode single frame h264 (.mp4) video with FFmpeg. No video stream present

  5 mai 2015, par Maxito

  I have achieved this with ffmpeg command line tool using the command. The folder had only one image.

  ffmpeg -r 24 -i image%03d.bmp -c:v libx264 -pix_fmt yuv420p
  oneframex.mp4

  I would like to do the same with C++. If I encode a video of three or more frames, video encodes correctly, but the result of encoding a one or two frames video never has a video stream, as reported by ffprobe and some media players.

  Comparing with ffprobe, my video (the one with three or more frames) and the one generated by the command tool show almost the same information. Only bitrate and encoder version are different.

  I have tried adding force_key_frames to 1, tried with many encoding options and have be unsuccessful.

  The application output gives me this information :

  [libx264 @ 20d1b840] using cpu capabilities : MMX2 SSE2Fast SSSE3
  SSE4.2 AVX

  [libx264 @ 20d1b840] profile High, level 4.0

  [libx264 @ 20d1b840] 264 - core 142 r2431 ac76440 - H.264/MPEG-4 AVC
  codec - Copyleft 2003-2014 - http://www.videolan.org/x264.html -
  options : cabac=0 ref=1 deblock=1:0:0 analyse=0x3:0x113 me=dia subme=8
  psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=0 trellis=0
  8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2
  threads=1 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1
  interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0
  keyint=1 keyint_min=1 scenecut=0 intra_refresh=0 rc=crf mbtree=0
  crf=10.0 qcomp=0.60 qpmin=0 qpmax=25 qpstep=4 ip_ratio=1.40 aq=1:1.00

  These are my main parameters :

  pCodecCtx->codec_id = AV_CODEC_ID_H264;
  
  pCodecCtx->pix_fmt= AV_PIX_FMT_YUV420P; 
  
  pCodecCtx->gop_size = 1;
  
  pCodecCtx->bit_rate = 400000;
  
  pCodecCtx->me_range = 16;
  
  pCodecCtx->max_qdiff = 4;
  
  pCodecCtx->qcompress = 0.6;
  
  pCodecCtx->qmin = 0;
  
  pCodecCtx->qmax = 25;
  
  pCodecCtx->time_base.den = 24;
  
  pCodecCtx->time_base.num = 1;
  
  
  
  AVDictionary *param = 0;
  
              av_dict_set(&param, "preset", "slow", 0);
  
              av_dict_set(&param, "profile", "high", 0);
  
              av_dict_set(&param, "crf", "10", 0); //this gave me quality
  
              av_dict_set(&param, "force_key_frames", "1", 0);

  In my encoding I just added

  ppicture->pts = pCodecCtx->frame_number

  to avoid non-strictly-monotonic PTS message. And tried the methods from this question in case it had something to do.

  I’m sure I must be missing some important parameter to be able to create such a small video. I will take any suggestion.

• Unable to encode single frame h264 (.mp4) video with FFmpeg. No video stream present

  1er avril 2021, par Maxito

  I have achieved this with ffmpeg command line tool using the command. The folder had only one image.

  



  


  ffmpeg -r 24 -i image%03d.bmp -c:v libx264 -pix_fmt yuv420p
 oneframex.mp4

  


  



  I would like to do the same with C++. If I encode a video of three or more frames, video encodes correctly, but the result of encoding a one or two frames video never has a video stream, as reported by ffprobe and some media players.

  



  Comparing with ffprobe, my video (the one with three or more frames) and the one generated by the command tool show almost the same information. Only bitrate and encoder version are different.

  



  I have tried adding force_key_frames to 1, tried with many encoding options and have be unsuccessful.

  



  The application output gives me this information :

  



  


  [libx264 @ 20d1b840] using cpu capabilities : MMX2 SSE2Fast SSSE3
 SSE4.2 AVX

  
 


  [libx264 @ 20d1b840] profile High, level 4.0

  
 


  [libx264 @ 20d1b840] 264 - core 142 r2431 ac76440 - H.264/MPEG-4 AVC
 codec - Copyleft 2003-2014 - http://www.videolan.org/x264.html -
 options : cabac=0 ref=1 deblock=1:0:0 analyse=0x3:0x113 me=dia subme=8
 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=0 trellis=0
 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2
 threads=1 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1
 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0
 keyint=1 keyint_min=1 scenecut=0 intra_refresh=0 rc=crf mbtree=0
 crf=10.0 qcomp=0.60 qpmin=0 qpmax=25 qpstep=4 ip_ratio=1.40 aq=1:1.00

  


  



  These are my main parameters :

  



  pCodecCtx->codec_id = AV_CODEC_ID_H264;
pCodecCtx->pix_fmt= AV_PIX_FMT_YUV420P; 
pCodecCtx->gop_size = 1;
pCodecCtx->bit_rate = 400000;
pCodecCtx->me_range = 16;
pCodecCtx->max_qdiff = 4;
pCodecCtx->qcompress = 0.6;
pCodecCtx->qmin = 0;
pCodecCtx->qmax = 25;
pCodecCtx->time_base.den = 24;
pCodecCtx->time_base.num = 1;

AVDictionary *param = 0;
            av_dict_set(&param, "preset", "slow", 0);
            av_dict_set(&param, "profile", "high", 0);
            av_dict_set(&param, "crf", "10", 0); //this gave me quality
            av_dict_set(&param, "force_key_frames", "1", 0);


  



  In my encoding I just added

  



  ppicture->pts = pCodecCtx->frame_number


  



  to avoid non-strictly-monotonic PTS message. And tried the methods from this question in case it had something to do.

  



  I’m sure I must be missing some important parameter to be able to create such a small video. I will take any suggestion.

  


• Why VLC not display RTP stream

  5 janvier 2018, par Alexandr Lukovnikov

  I am new in RTP. I whant to start RTSP server on embeded device. Now I can whatching video file, that stored in flash memory. But when I start translate video, that encoded whith x264, VLC not display anything.
  Just buffering, nothing else

  core debug: `rtsp://172.16.50.194:1935/live1.sdp' successfully opened
  
  core debug: Buffering 0%
  
  packetizer_h264 debug: found NAL_SPS (sps_id=0)
  
  core debug: Stream buffering done (11 ms in 133 ms)
  
  core debug: Decoder wait done in 0 ms
  
  packetizer_h264 debug: found NAL_PPS (pps_id=0 sps_id=0)
  
  core error: ES_OUT_SET_(GROUP_)PCR is called too late (pts_delay increased to 30 ms)
  
  core error: ES_OUT_RESET_PCR called
  
  core debug: Buffering 0%
  
  core debug: Buffering 0%
  
  core debug: Buffering 0%
  
  core debug: Stream buffering done (111 ms in 706 ms)
  
  core debug: Decoder wait done in 0 ms
  
  core error: ES_OUT_SET_(GROUP_)PCR is called too late (pts_delay increased to 594 ms)
  
  core error: ES_OUT_RESET_PCR called
  
  core debug: Buffering 0%
  
  ...
  
  core debug: Buffering 0%
  
  live555 warning: no data received in 10s, eof ?
  
  core debug: EOF reached

  That is Wireshark dump

  SPS slice

  1111 0100 = Profile_idc: Unknown (244)
  
  0... .... = Constraint_set0_flag: 0
  
  .0.. .... = Constraint_set1_flag: 0
  
  ..0. .... = Constraint_set2_flag: 0
  
  ...0 .... = Constraint_set3_flag: 0
  
  .... 0... = Constraint_set4_flag: 0
  
  .... .0.. = Constraint_set5_flag: 0
  
  .... ..00 = Reserved_zero_2bits: 0
  
  0000 1101 = Level_id: 13 [Level 1.3 768 kb/s]
  
  1... .... = seq_parameter_set_id: 0
  
  .001 00.. = log2_max_frame_num_minus4: 3
  
  .... ..01  1... .... = pic_order_cnt_type: 2
  
  .001 01.. = num_ref_frames: 4
  
  .... ..1. = gaps_in_frame_num_value_allowed_flag: 1
  
  .... ...0  10.. .... = pic_width_in_mbs_minus1: 1
  
  ..00 0001  0100 0... = pic_height_in_map_units_minus1: 39
  
  .... .0.. = frame_mbs_only_flag: 0
  
  .... ..0. = mb_adaptive_frame_field_flag: 0
  
  .... ...1 = direct_8x8_inference_flag: 1
  
  1... .... = frame_cropping_flag: 1
  
  .1.. .... = frame_crop_left_offset: 0
  
  ..1. .... = frame_crop_left_offset: 0
  
  ...1 .... = frame_crop_top_offset: 0
  
  .... 1... = frame_crop_bottom_offset: 0
  
  .... .0.. = vui_parameters_present_flag: 0
  
  .... ..1. = rbsp_stop_bit: 1
  
  .... ...0 = rbsp_trailing_bits: 0

  PPS slice

   1... .... = pic_parameter_set_id: 0
  
      .1.. .... = seq_parameter_set_id: 0
  
      ..0. .... = entropy_coding_mode_flag: 0
  
      ...0 .... = pic_order_present_flag: 0
  
      .... 1... = num_slice_groups_minus1: 0
  
      .... .1.. = num_ref_idx_l0_active_minus1: 0
  
      .... ..1. = num_ref_idx_l1_active_minus1: 0
  
      .... ...0 = weighted_pred_flag: 0
  
      00.. .... = weighted_bipred_idc: 0
  
      ..00 0010  110. .... = pic_init_qp_minus26(se(v)): 11
  
      ...1 .... = pic_init_qs_minus26: 0
  
      .... 1... = chroma_qp_index_offset: 0
  
      .... .1.. = deblocking_filter_control_present_flag: 1
  
      .... ..0. = constrained_intra_pred_flag: 0
  
      .... ...0 = redundant_pic_cnt_present_flag: 0
  
      1... .... = rbsp_stop_bit: 1
  
      .000 0000 = rbsp_trailing_bits: 0

  And SEI

  x264 - core 152 r2851 ba24899 - 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=10 lookahead_threads=1 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

  What could be my mistake ?