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• ffmpeg : problems playing video on android

  25 novembre 2020, par Jonathan García

  (Translated) Hello ! I have the following problem. I concatenate multiple ts files and convert to mp4 with ffmpeg. I do this operation multiple times in an automated way, so I don't always check the results, but whenever I do, on the computer, the result obtained is as expected. However, some videos, when played on an Android device, are seen incorrectly in any application : Chrome, Firefox, Vlc, etc. The version of ffmpeg I use is the latest. This is the command I use :

  


  ffmpeg.exe -hwaccel dxva2 -y -f concat -i list.txt -acodec copy -vcodec copy output.mp4 -preset normal

  


  Results :

  


  PC

  


  Android

  


  This is the output of ffmpeg :

  


  ffmpeg version n4.3.1-26-gca55240b8c Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 9.3-win32 (GCC) 20200320
  configuration: --prefix=/ffbuild/prefix --pkg-config-flags=--static --pkg-config=pkg-config --cross-prefix=x86_64-w64-mingw32- --arch=x86_64 --target-os=mingw32 --enable-gpl --enable-version3 --disable-debug --disable-w32threads --enable-pthreads --enable-iconv --enable-zlib --enable-libxml2 --enable-libfreetype --enable-libfribidi --enable-gmp --enable-lzma --enable-fontconfig --enable-opencl --enable-libvmaf --disable-vulkan --enable-libvorbis --enable-amf --enable-libaom --enable-avisynth --enable-libdav1d --enable-libdavs2 --enable-ffnvcodec --enable-cuda-llvm --disable-libglslang --enable-libass --enable-libbluray --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvpx --enable-libwebp --enable-libmfx --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librav1e --enable-librubberband --enable-schannel --enable-sdl2 --enable-libsoxr --enable-libsrt --enable-libtwolame --enable-libvidstab --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxvid --enable-libzimg --extra-cflags=-DLIBTWOLAME_STATIC --extra-cxxflags= --extra-ldflags=-pthread --extra-libs=-lgomp
  libavutil      56. 51.100 / 56. 51.100
  libavcodec     58. 91.100 / 58. 91.100
  libavformat    58. 45.100 / 58. 45.100
  libavdevice    58. 10.100 / 58. 10.100
  libavfilter     7. 85.100 /  7. 85.100
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100
Trailing option(s) found in the command: may be ignored.
Input #0, concat, from 'list.txt':
  Duration: N/A, start: 0.000000, bitrate: N/A
    Stream #0:0: Data: timed_id3 (ID3  / 0x20334449)
    Stream #0:1: Video: h264 (Main) ([27][0][0][0] / 0x001B), yuv420p(tv, unknown/bt470bg/unknown, progressive), 320x568, 29.50 fps, 29.50 tbr, 90k tbn, 180k tbc
    Stream #0:2: Audio: aac (LC) ([15][0][0][0] / 0x000F), 44100 Hz, mono, fltp, 64 kb/s
Output #0, mp4, to 'output.mp4':
  Metadata:
    encoder         : Lavf58.45.100
    Stream #0:0: Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, unknown/bt470bg/unknown, progressive), 320x568, q=2-31, 29.50 fps, 29.50 tbr, 90k tbn, 90k tbc
    Stream #0:1: Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 64 kb/s
Stream mapping:
  Stream #0:1 -> #0:0 (copy)
  Stream #0:2 -> #0:1 (copy)
Press [q] to stop, [?] for help
frame= 9504 fps=8330 q=-1.0 Lsize=   24561kB time=00:07:42.26 bitrate= 435.3kbits/s speed= 405x
video:21200kB audio:3100kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.073735%


  


  Not all videos are "yuv420p (tv, unknown / bt470bg / unknown, progressive)", but this should not be the problem, since other videos with this information are seen correctly on Android.

  


  To correct this type of video I do the following :

  


  ffmpeg -y -f concat -i list.txt -c:v libx264 -preset slow -crf 22 -pix_fmt yuv420p -c:a aac -b:a 128k output.mp4

  


  So I get the video to play correctly both on pc and Android. Unfortunately, automating the process by always using this last line occasionally causes problems (starting file 40MB, ending file> 1GB, more than 2 hours)

  


  I would like, if possible, help me identify which videos will be viewed incorrectly on Android. Thank you very much in advance. Finally, this is the answer that ffmpeg gives when executing the line with which I fix the file :

  


  ffmpeg version n4.3.1-26-gca55240b8c Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 9.3-win32 (GCC) 20200320
  configuration: --prefix=/ffbuild/prefix --pkg-config-flags=--static --pkg-config=pkg-config --cross-prefix=x86_64-w64-mingw32- --arch=x86_64 --target-os=mingw32 --enable-gpl --enable-version3 --disable-debug --disable-w32threads --enable-pthreads --enable-iconv --enable-zlib --enable-libxml2 --enable-libfreetype --enable-libfribidi --enable-gmp --enable-lzma --enable-fontconfig --enable-opencl --enable-libvmaf --disable-vulkan --enable-libvorbis --enable-amf --enable-libaom --enable-avisynth --enable-libdav1d --enable-libdavs2 --enable-ffnvcodec --enable-cuda-llvm --disable-libglslang --enable-libass --enable-libbluray --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvpx --enable-libwebp --enable-libmfx --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librav1e --enable-librubberband --enable-schannel --enable-sdl2 --enable-libsoxr --enable-libsrt --enable-libtwolame --enable-libvidstab --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxvid --enable-libzimg --extra-cflags=-DLIBTWOLAME_STATIC --extra-cxxflags= --extra-ldflags=-pthread --extra-libs=-lgomp
  libavutil      56. 51.100 / 56. 51.100
  libavcodec     58. 91.100 / 58. 91.100
  libavformat    58. 45.100 / 58. 45.100
  libavdevice    58. 10.100 / 58. 10.100
  libavfilter     7. 85.100 /  7. 85.100
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100
Input #0, concat, from 'list.txt':
  Duration: N/A, start: 0.000000, bitrate: N/A
    Stream #0:0: Data: timed_id3 (ID3  / 0x20334449)
    Stream #0:1: Video: h264 (Main) ([27][0][0][0] / 0x001B), yuv420p(tv, unknown/bt470bg/unknown, progressive), 320x568, 29.50 fps, 29.50 tbr, 90k tbn, 180k tbc
    Stream #0:2: Audio: aac (LC) ([15][0][0][0] / 0x000F), 44100 Hz, mono, fltp, 64 kb/s
Stream mapping:
  Stream #0:1 -> #0:0 (h264 (native) -> h264 (libx264))
  Stream #0:2 -> #0:1 (aac (native) -> aac (native))
Press [q] to stop, [?] for help
[libx264 @ 000001efdbaee540] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 000001efdbaee540] profile High, level 3.0, 4:2:0, 8-bit
[libx264 @ 000001efdbaee540] 264 - core 161 - H.264/MPEG-4 AVC codec - Copyleft 2003-2020 - http://www.videolan.org/x264.html - options: cabac=1 ref=5 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=8 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=2 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=12 lookahead_threads=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=3 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=50 rc=crf mbtree=1 crf=22.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'd.mp4':
  Metadata:
    encoder         : Lavf58.45.100
    Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 320x568, q=-1--1, 29.50 fps, 15104 tbn, 29.50 tbc
    Metadata:
      encoder         : Lavc58.91.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
    Stream #0:1: Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 128 kb/s
    Metadata:
      encoder         : Lavc58.91.100 aac
More than 1000 frames duplicated    8960kB time=00:02:06.74 bitrate= 579.1kbits/s dup=999 drop=0 speed=15.7x
frame=13638 fps=468 q=-1.0 Lsize=   32033kB time=00:07:42.20 bitrate= 567.8kbits/s dup=4134 drop=0 speed=15.9x
video:25547kB audio:5995kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.557852%
[libx264 @ 000001efdbaee540] frame I:87    Avg QP:19.17  size: 12750
[libx264 @ 000001efdbaee540] frame P:4630  Avg QP:21.89  size:  4286
[libx264 @ 000001efdbaee540] frame B:8921  Avg QP:23.89  size:   583
[libx264 @ 000001efdbaee540] consecutive B-frames:  8.9%  8.6%  9.1% 73.4%
[libx264 @ 000001efdbaee540] mb I  I16..4: 12.2% 76.2% 11.6%
[libx264 @ 000001efdbaee540] mb P  I16..4:  3.7% 11.0%  0.8%  P16..4: 37.1% 16.2%  5.7%  0.0%  0.0%    skip:25.4%
[libx264 @ 000001efdbaee540] mb B  I16..4:  0.3%  0.9%  0.1%  B16..8: 30.4%  3.1%  0.3%  direct: 0.8%  skip:64.2%  L0:51.4% L1:44.3% BI: 4.3%
[libx264 @ 000001efdbaee540] 8x8 transform intra:71.2% inter:66.8%
[libx264 @ 000001efdbaee540] direct mvs  spatial:99.9% temporal:0.1%
[libx264 @ 000001efdbaee540] coded y,uvDC,uvAC intra: 52.5% 42.1% 5.5% inter: 9.7% 9.0% 0.3%
[libx264 @ 000001efdbaee540] i16 v,h,dc,p: 19% 21%  9% 50%
[libx264 @ 000001efdbaee540] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 22% 11% 13%  6%  9% 11%  9% 11%  8%
[libx264 @ 000001efdbaee540] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 23%  9%  8%  6% 14% 14% 11%  9%  6%
[libx264 @ 000001efdbaee540] i8c dc,h,v,p: 46% 20% 23% 12%
[libx264 @ 000001efdbaee540] Weighted P-Frames: Y:2.9% UV:0.8%
[libx264 @ 000001efdbaee540] ref P L0: 72.3% 12.2% 11.3%  2.1%  1.9%  0.2%  0.0%
[libx264 @ 000001efdbaee540] ref B L0: 93.1%  5.5%  1.1%  0.3%
[libx264 @ 000001efdbaee540] ref B L1: 97.6%  2.4%
[libx264 @ 000001efdbaee540] kb/s:452.67
[aac @ 000001efdbaee9c0] Qavg: 10682.834


  


• Frame sliced into 2 under some degree. How fix it ?

  26 novembre 2020, par Алекс Аникей

  I trying use h264 codec in videochat application. And in some reason frame sliced into 2 triangle (picture below). I try send my desktop image to another person and get this image on another client.

  


  What settings i set wrong ?
My code :

  


  Init :

  


  VCSession *vc_new_x264(Logger *log, ToxAV *av, uint32_t friend_number, toxav_video_receive_frame_cb *cb, void *cb_data,
                       VCSession *vc)
{

    if (x264_param_default_preset(&param, "slow", "zerolatency") < 0) {
        // goto fail;
    }

    param.i_csp = X264_CSP_I420;
    param.i_width  = 1920;
    param.i_height = 1080;
    vc->h264_enc_width = param.i_width;
    vc->h264_enc_height = param.i_height;

    param.i_keyint_max = 30;

    param.b_vfr_input = 1; /* VFR input.  If 1, use timebase and timestamps for ratecontrol purposes.
                            * If 0, use fps only. */
    param.i_timebase_num = 1;       // 1 ms = timebase units = (1/1000)s
    param.i_timebase_den = 1000;   // 1 ms = timebase units = (1/1000)s
    param.b_repeat_headers = 1;
    param.b_annexb = 1;

    param.rc.f_rate_tolerance = VIDEO_F_RATE_TOLERANCE_H264;
    param.rc.i_vbv_buffer_size = 1500;
    param.rc.i_vbv_max_bitrate = VIDEO_BITRATE_INITIAL_VALUE_H264 * 1;

    vc->h264_enc_bitrate = VIDEO_BITRATE_INITIAL_VALUE_H264;

    param.rc.i_qp_min = 13;
    param.rc.i_qp_max = 35; // max quantizer for x264

    vc->h264_enc_bitrate = VIDEO_BITRATE_INITIAL_VALUE_H264;

    param.rc.b_stat_read = 0;
    param.rc.b_stat_write = 0;


    if (x264_param_apply_profile(&param,
                                 "high") < 0) { // "baseline", "main", "high", "high10", "high422", "high444"
        // goto fail;
    }


    if (x264_picture_alloc(&(vc->h264_in_pic), param.i_csp, param.i_width, param.i_height) < 0) {
        // goto fail;
    }

    vc->h264_encoder = x264_encoder_open(&param);

    AVCodec *codec = NULL;
    vc->h264_decoder = NULL;
    avcodec_register_all();
    codec = NULL;

    codec = avcodec_find_decoder(AV_CODEC_ID_H264);

    if (!codec) {
        LOGGER_WARNING(log, "codec not found H264 on decoder");
    }

    vc->h264_decoder = avcodec_alloc_context3(codec);

    if (codec->capabilities & AV_CODEC_CAP_TRUNCATED) {
        vc->h264_decoder->flags |= AV_CODEC_FLAG_TRUNCATED; /* we do not send complete frames */
    }


    vc->h264_decoder->delay = 5;

    if (avcodec_open2(vc->h264_decoder, codec, NULL) < 0) {
        LOGGER_WARNING(log, "could not open codec H264 on decoder");
    }


    return vc;
}


  


  Get frame and decoding him :

  


  void vc_iterate_x264(VCSession *vc)
{

    if (!vc) {
        return;
    }

    pthread_mutex_lock(vc->queue_mutex);

    struct RTPMessage *p;

    if (!rb_read(vc->vbuf_raw, (void **)&p)) {
        LOGGER_TRACE(vc->log, "no Video frame data available");
        pthread_mutex_unlock(vc->queue_mutex);
        return;
    }

    pthread_mutex_unlock(vc->queue_mutex);
    const struct RTPHeader *const header = &p->header;

    uint32_t full_data_len;

    if (header->flags & RTP_LARGE_FRAME) {
        full_data_len = header->data_length_full;
        LOGGER_WARNING(vc->log, "vc_iterate:001:full_data_len=%d", (int)full_data_len);
    } else {
        full_data_len = p->len;
        if (header->data_length_lower != full_data_len)
        {
            LOGGER_ERROR("Data header and packet don't equal: %d - header %d - packet", header->data_length_lower, full_data_len);
        }
        LOGGER_DEBUG(vc->log, "vc_iterate:002");
    }

    decode_frame_h264(vc, p, full_data_len);
}

void decode_frame_h264(VCSession *vc,
                       struct RTPMessage *p,
                       uint32_t full_data_len)
{

    AVPacket *compr_data;
    compr_data = av_packet_alloc();


    uint8_t *tmp_buf = calloc(1, full_data_len + FF_INPUT_BUFFER_PADDING_SIZE);
    memcpy(tmp_buf, p->data, full_data_len);

    compr_data->data = tmp_buf; // p->data;
    compr_data->size = (int)full_data_len; // hmm, "int" again

    avcodec_send_packet(vc->h264_decoder, compr_data);

    int ret_ = 0;
    while (ret_ >= 0) {
        AVFrame *frame = av_frame_alloc();
        ret_ = avcodec_receive_frame(vc->h264_decoder, frame);
        if (ret_ == AVERROR(EAGAIN) || ret_ == AVERROR_EOF) {
            // error
            break;
        } else if (ret_ < 0) {
            // Error during decoding
            break;
        } else if (ret_ == 0) {
            vc->vcb(vc->av, vc->friend_number, frame->width, frame->height,
                          (const uint8_t *)frame->data[0],
                          (const uint8_t *)frame->data[1],
                          (const uint8_t *)frame->data[2],
                          frame->linesize[0], frame->linesize[1],
                          frame->linesize[2], vc->vcb_user_data);
        } else {
            // some other error
        }
        av_frame_free(&frame);
    }
    av_packet_free(&compr_data);
    free(tmp_buf);
    free(p);
}


  


  Send frame and encoding :

  


  bool toxav_video_send_frame(ToxAV *av, uint32_t friend_number, uint16_t width, uint16_t height, const uint8_t *y,
                            const uint8_t *u, const uint8_t *v, Toxav_Err_Send_Frame *error, int16_t kf_max_dist, vpx_codec_er_flags_t error_resilient,
                            unsigned int my_lag_in_frames, uint16_t kf_mode, uint16_t quality_mode)
{
    Toxav_Err_Send_Frame rc = TOXAV_ERR_SEND_FRAME_OK;
    ToxAVCall *call;
    uint64_t video_frame_record_timestamp = current_time_monotonic(av->m->mono_time);

    int vpx_encode_flags = 0;

    pthread_mutex_lock(call->mutex_video);
    pthread_mutex_unlock(av->mutex);

    if (y == nullptr || u == nullptr || v == nullptr) {
        pthread_mutex_unlock(call->mutex_video);
        rc = TOXAV_ERR_SEND_FRAME_NULL;
        goto RETURN;
    }


    if (call->video_rtp->ssrc < VIDEO_SEND_X_KEYFRAMES_FIRST) {
        // Key frame flag for first frames
        vpx_encode_flags = VPX_EFLAG_FORCE_KF;
        LOGGER_INFO(av->m->log, "I_FRAME_FLAG:%d only-i-frame mode", call->video_rtp->ssrc);

        ++call->video_rtp->ssrc;
    } else if (call->video_rtp->ssrc == VIDEO_SEND_X_KEYFRAMES_FIRST) {
        // normal keyframe placement
        vpx_encode_flags = 0;
        LOGGER_INFO(av->m->log, "I_FRAME_FLAG:%d normal mode", call->video_rtp->ssrc);

        ++call->video_rtp->ssrc;
    }


    x264_nal_t *nal = NULL;
    int i_frame_size = 0;

    uint32_t result = encode_frame_h264(av, friend_number, width, height,
                                        y, u, v,
                                        &video_frame_record_timestamp,
                                        vpx_encode_flags,
                                        &nal,
                                        &i_frame_size);
    if (result != 0) {
        pthread_mutex_unlock(call->mutex_video);
        rc = TOXAV_ERR_SEND_FRAME_INVALID;
        goto RETURN;
    }

    ++call->video->frame_counter;

    rc = send_frames_h264(av, friend_number, width, height,
                          y, u, v, call,
                          &video_frame_record_timestamp,
                          vpx_encode_flags,
                          &nal,
                          &i_frame_size,
                          &rc);

    pthread_mutex_unlock(call->mutex_video);

RETURN:

    if (error) {
        *error = rc;
    }

    return rc == TOXAV_ERR_SEND_FRAME_OK;
}

uint32_t send_frames_h264(ToxAV *av, uint32_t friend_number, uint16_t width, uint16_t height,
                          const uint8_t *y,
                          const uint8_t *u, const uint8_t *v, ToxAVCall *call,
                          uint64_t *video_frame_record_timestamp,
                          int vpx_encode_flags,
                          x264_nal_t **nal,
                          int *i_frame_size,
                          TOXAV_ERR_SEND_FRAME *rc)
{

    if (*i_frame_size > 0) {

        // use the record timestamp that was actually used for this frame
        *video_frame_record_timestamp = (uint64_t)call->video->h264_in_pic.i_pts;
        const uint32_t frame_length_in_bytes = *i_frame_size;
        const int keyframe = (int)call->video->h264_out_pic.b_keyframe;

        LOGGER_DEBUG(av->m->log, "video packet record time: %lu", (*video_frame_record_timestamp));

        int res = rtp_send_data
                  (
                      call->video_rtp,
                      (const uint8_t *)((*nal)->p_payload),
                      frame_length_in_bytes,
                      keyframe,
                      *video_frame_record_timestamp,
                      av->m->log
                  );

        (*video_frame_record_timestamp)++;

        if (res < 0) {
            LOGGER_WARNING(av->m->log, "Could not send video frame: %s", strerror(errno));
            *rc = TOXAV_ERR_SEND_FRAME_RTP_FAILED;
            return 1;
        }

        return 0;
    } else {
        *rc = TOXAV_ERR_SEND_FRAME_RTP_FAILED;
        return 1;
    }

}


  


  I get image like this :

  


  

  


• H264 codec encode, decode and write to file

  30 novembre 2020, par Алекс Аникей

  I try to use ffmpeg and h264 codec to translate the video in realtime. But at the state of decoding encoded frame, I get some "bad" image.
Init encoder and decoder :

  


      VCSession *vc_new_x264(Logger *log, ToxAV *av, uint32_t friend_number, toxav_video_receive_frame_cb *cb, void *cb_data,
                       VCSession *vc)
{

// ------ ffmpeg encoder ------
    AVCodec *codec2 = NULL;
    vc->h264_encoder_ctx = NULL;//AVCodecContext type

    codec2 = NULL;
    avcodec_register_all();
    codec2 = avcodec_find_encoder(AV_CODEC_ID_H264);
    if (codec2 == NULL)
    {
        LOGGER_WARNING(log, "h264: not find encoder");
    }

    vc->h264_encoder_ctx = avcodec_alloc_context3(codec2);

    vc->h264_out_pic2 = av_packet_alloc();

    vc->h264_encoder_ctx->bit_rate = 10 *1000 * 1000;
    vc->h264_encoder_ctx->width = 800;
    vc->h264_encoder_ctx->height = 600;

    vc->h264_enc_width = vc->h264_encoder_ctx->width;
    vc->h264_enc_height = vc->h264_encoder_ctx->height;
    vc->h264_encoder_ctx->time_base = (AVRational) {
            1, 30
    };
    vc->h264_encoder_ctx->gop_size = 30;
    vc->h264_encoder_ctx->max_b_frames = 1;
    vc->h264_encoder_ctx->pix_fmt = AV_PIX_FMT_YUV420P;


    av_opt_set(vc->h264_encoder_ctx->priv_data, "preset", "veryfast", 0);


    av_opt_set(vc->h264_encoder_ctx->priv_data, "annex_b", "1", 0);
    av_opt_set(vc->h264_encoder_ctx->priv_data, "repeat_headers", "1", 0);
    av_opt_set(vc->h264_encoder_ctx->priv_data, "tune", "zerolatency", 0);
    av_opt_set_int(vc->h264_encoder_ctx->priv_data, "zerolatency", 1, 0);

    vc->h264_encoder_ctx->time_base.num = 1;
    vc->h264_encoder_ctx->time_base.den = 1000;

    vc->h264_encoder_ctx->framerate = (AVRational) {
        1000, 40
    };

    AVDictionary *opts = NULL;

    if (avcodec_open2(vc->h264_encoder_ctx, codec2, &opts) < 0) {
        LOGGER_ERROR(log, "could not open codec H264 on encoder");
    }

    av_dict_free(&opts);



    AVCodec *codec = NULL;
    vc->h264_decoder_ctx = NULL;// AVCodecContext - type
    codec = NULL;

    codec = avcodec_find_decoder(AV_CODEC_ID_H264);

    if (!codec) {
        LOGGER_WARNING(log, "codec not found H264 on decoder");
    }

    vc->h264_decoder_ctx = avcodec_alloc_context3(codec);

    if (codec->capabilities & AV_CODEC_CAP_TRUNCATED) {
        vc->h264_decoder_ctx->flags |= AV_CODEC_FLAG_TRUNCATED; /* we do not send complete frames */
    }

    if (codec->capabilities & AV_CODEC_FLAG_LOW_DELAY) {
        vc->h264_decoder_ctx->flags |= AV_CODEC_FLAG_LOW_DELAY;
    }

    vc->h264_decoder_ctx->flags |= AV_CODEC_FLAG2_SHOW_ALL;

     vc->h264_decoder_ctx->refcounted_frames = 0;

    vc->h264_decoder_ctx->delay = 0;
    vc->h264_decoder_ctx->sw_pix_fmt = AV_PIX_FMT_YUV420P;
    av_opt_set_int(vc->h264_decoder_ctx->priv_data, "delay", 0, AV_OPT_SEARCH_CHILDREN);
    vc->h264_decoder_ctx->time_base = (AVRational) {
            40, 1000
};
    vc->h264_decoder_ctx->framerate = (AVRational) {
        1000, 40
    };

    if (avcodec_open2(vc->h264_decoder_ctx, codec, NULL) < 0) {
        LOGGER_WARNING(log, "could not open codec H264 on decoder");
    }
    vc->h264_decoder_ctx->refcounted_frames = 0;

    return vc;
}


  


  Encoding (in this function i encode frame and for debugging decode and save him in file) :

  


  uint32_t encode_frame_h264_p(ToxAV *av, uint32_t friend_number, uint16_t width, uint16_t height,
                           const uint8_t *y,
                           const uint8_t *u, const uint8_t *v, ToxAVCall *call,
                           uint64_t *video_frame_record_timestamp,
                           int vpx_encode_flags,
                           x264_nal_t **nal,
                           int *i_frame_size)
{
    AVFrame *frame;
    int ret;
    uint32_t result = 1;

    frame = av_frame_alloc();

    frame->format = call->video->h264_encoder_ctx->pix_fmt;
    frame->width  = width;
    frame->height = height;

    ret = av_frame_get_buffer(frame, 32);

    if (ret < 0) {
        LOGGER_ERROR(av->m->log, "av_frame_get_buffer:Could not allocate the video frame data");
    }

    /* make sure the frame data is writable */
    ret = av_frame_make_writable(frame);

    if (ret < 0) {
        LOGGER_ERROR(av->m->log, "av_frame_make_writable:ERROR");
    }

    frame->pts = (int64_t)(*video_frame_record_timestamp);


    // copy YUV frame data into buffers
    memcpy(frame->data[0], y, width * height);
    memcpy(frame->data[1], u, (width / 2) * (height / 2));
    memcpy(frame->data[2], v, (width / 2) * (height / 2));

    // encode the frame
    ret = avcodec_send_frame(call->video->h264_encoder_ctx, frame);

    if (ret < 0) {
        LOGGER_ERROR(av->m->log, "Error sending a frame for encoding:ERROR");
    }


    ret = avcodec_receive_packet(call->video->h264_encoder_ctx, call->video->h264_out_pic2);



    if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) {
        *i_frame_size = 0;
    } else if (ret < 0) {
        *i_frame_size = 0;
        // fprintf(stderr, "Error during encoding\n");
    } else {

        // Decoded encoded frame and save him to file

        saveInFile(call->video->h264_decoder_ctx, frame, call->video->h264_out_pic2, "/home/user/testSave");

        // printf("Write packet %3"PRId64" (size=%5d)\n", call->video->h264_out_pic2->pts, call->video->h264_out_pic2->size);
        // fwrite(call->video->h264_out_pic2->data, 1, call->video->h264_out_pic2->size, outfile);

        global_encoder_delay_counter++;

        if (global_encoder_delay_counter > 60) {
            global_encoder_delay_counter = 0;
            LOGGER_DEBUG(av->m->log, "enc:delay=%ld",
                         (long int)(frame->pts - (int64_t)call->video->h264_out_pic2->pts)
                        );
        }


        *i_frame_size = call->video->h264_out_pic2->size;
        *video_frame_record_timestamp = (uint64_t)call->video->h264_out_pic2->pts;

        result = 0;
    }

    av_frame_free(&frame);

    return result;

}


  


  Decode and save frame code :

  


  void saveInFile(AVCodecContext *dec_ctx, AVFrame *frame, AVPacket *pkt, const char *filename)
{
    if (!pkt)
        return;
    char buf[1024];
    int ret;
    static int curNumber = 0;
    ret = avcodec_send_packet(dec_ctx, pkt);
    if (ret < 0 && ret != AVERROR_EOF)
    {
        fprintf(stderr, "Error sending a packet for decoding'\n");
        if ( ret == AVERROR(EAGAIN))
            return;
        if (ret == AVERROR(EINVAL))
            return;
        if (ret == AVERROR(ENOMEM))
            return;

    }

        ret = avcodec_receive_frame(dec_ctx, frame);
        if (ret == AVERROR(EAGAIN) )
            return;
        if (ret == AVERROR_EOF)
        {
            return;
        }
        else if (ret < 0)
        {
            fprintf(stderr, "Error during decoding\n");
        }
        printf("saving frame %3d\n", dec_ctx->frame_number);
        sprintf(buf, "%s%d", filename, curNumber);
        curNumber++;
        pgm_save(frame->data[0], frame->linesize[0], frame->width, frame->height, buf);

}

void pgm_save(unsigned char* buf, int wrap, int xsize, int ysize, char *filename)
{
    FILE *f;
    int i;
    f = fopen(filename, "w");
    fprintf(f, "P5\n%d %d\n%d\n", xsize, ysize, 255);
    for (i =0; i < ysize; i++)
        fwrite(buf + i* wrap, 1, xsize, f);
    fclose(f);
}


  


  After this manipulation I have smth like that :