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Autres articles (22)

  • Supporting all media types

    13 avril 2011, par

    Unlike most software and media-sharing platforms, MediaSPIP aims to manage as many different media types as possible. The following are just a few examples from an ever-expanding list of supported formats : images : png, gif, jpg, bmp and more audio : MP3, Ogg, Wav and more video : AVI, MP4, OGV, mpg, mov, wmv and more text, code and other data : OpenOffice, Microsoft Office (Word, PowerPoint, Excel), web (html, CSS), LaTeX, Google Earth and (...)

  • Les formats acceptés

    28 janvier 2010, par

    Les commandes suivantes permettent d’avoir des informations sur les formats et codecs gérés par l’installation local de ffmpeg :
    ffmpeg -codecs ffmpeg -formats
    Les format videos acceptés en entrée
    Cette liste est non exhaustive, elle met en exergue les principaux formats utilisés : h264 : H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 m4v : raw MPEG-4 video format flv : Flash Video (FLV) / Sorenson Spark / Sorenson H.263 Theora wmv :
    Les formats vidéos de sortie possibles
    Dans un premier temps on (...)

  • Les vidéos

    21 avril 2011, par

    Comme les documents de type "audio", Mediaspip affiche dans la mesure du possible les vidéos grâce à la balise html5 .
    Un des inconvénients de cette balise est qu’elle n’est pas reconnue correctement par certains navigateurs (Internet Explorer pour ne pas le nommer) et que chaque navigateur ne gère en natif que certains formats de vidéos.
    Son avantage principal quant à lui est de bénéficier de la prise en charge native de vidéos dans les navigateur et donc de se passer de l’utilisation de Flash et (...)

Sur d’autres sites (3141)

  • 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 ?

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