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• Using ffmpeg to read mp4 file from stdin and extract image is failing with "Invalid data found when processing input"

  16 mars 2023, par jsindos

  Using ffmpeg, I'm trying to read an mp4 file from stdin, and save the last frame of the file to jpg.

  


  cat PXL_20221118_051057924.TS.mp4 | ffmpeg -sseof -3 -i - -f mp4 -update 1 -q:v 1 last.jpg


  


  The command works fine when not running from stdin.

  


  When running from stdin, an empty file is created, with the following error message :

  


  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fcb4d0041c0] stream 1, offset 0x2eaee0d: partial file
pipe:: Invalid data found when processing input


  


  I've posted the full output below.

  


  —

  


  ffmpeg version 5.1.2 Copyright (c) 2000-2022 the FFmpeg developers
  built with Apple clang version 14.0.0 (clang-1400.0.29.202)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/5.1.2_5 --enable-shared --enable-pthreads --enable-version3 --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libaribb24 --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librist --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libsvtav1 --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libspeex --enable-libsoxr --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack --enable-videotoolbox
  libavutil      57. 28.100 / 57. 28.100
  libavcodec     59. 37.100 / 59. 37.100
  libavformat    59. 27.100 / 59. 27.100
  libavdevice    59.  7.100 / 59.  7.100
  libavfilter     8. 44.100 /  8. 44.100
  libswscale      6.  7.100 /  6.  7.100
  libswresample   4.  7.100 /  4.  7.100
  libpostproc    56.  6.100 / 56.  6.100
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fcb4d0041c0] stream 2, offset 0x2c: partial file
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'pipe:':
  Metadata:
    major_brand     : isom
    minor_version   : 131072
    compatible_brands: isomiso2mp41
    creation_time   : 2022-11-18T05:11:23.000000Z
    com.android.capture.fps: 30.000000
  Duration: 00:00:23.74, start: 0.000000, bitrate: N/A
  Stream #0:0[0x1](eng): Data: none (mett / 0x7474656D), 45 kb/s (default)
    Metadata:
      creation_time   : 2022-11-18T05:11:23.000000Z
      handler_name    : MetaHandle
  Stream #0:1[0x2](eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 192 kb/s (default)
    Metadata:
      creation_time   : 2022-11-18T05:11:23.000000Z
      handler_name    : SoundHandle
      vendor_id       : [0][0][0][0]
  Stream #0:2[0x3](eng): Video: hevc (Main) (hvc1 / 0x31637668), yuvj420p(pc, bt709), 1920x1080, 19524 kb/s, SAR 1:1 DAR 16:9, 30 fps, 30 tbr, 90k tbn (default)
    Metadata:
      creation_time   : 2022-11-18T05:11:23.000000Z
      handler_name    : VideoHandle
      vendor_id       : [0][0][0][0]
    Side data:
      displaymatrix: rotation of -90.00 degrees
  Stream #0:3[0x4](eng): Data: none (mett / 0x7474656D) (default)
    Metadata:
      creation_time   : 2022-11-18T05:11:23.000000Z
      handler_name    : MetaHandle
Stream mapping:
  Stream #0:2 -> #0:0 (hevc (native) -> h264 (libx264))
  Stream #0:1 -> #0:1 (aac (native) -> aac (native))
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fcb4d0041c0] stream 1, offset 0x2eaee0d: partial file
pipe:: Invalid data found when processing input
[libx264 @ 0x7fcb4d10b500] -qscale is ignored, -crf is recommended.
[libx264 @ 0x7fcb4d10b500] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0x7fcb4d10b500] profile High, level 4.0, 4:2:0, 8-bit
[libx264 @ 0x7fcb4d10b500] 264 - core 164 r3095 baee400 - H.264/MPEG-4 AVC codec - Copyleft 2003-2022 - 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=18 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 '/Users/josephtsindos/Downloads/last2.jpg':
  Metadata:
    major_brand     : isom
    minor_version   : 131072
    compatible_brands: isomiso2mp41
    com.android.capture.fps: 30.000000
    encoder         : Lavf59.27.100
  Stream #0:0(eng): Video: h264 (avc1 / 0x31637661), yuvj420p(pc), 1080x1920, q=2-31, 30 fps, 15360 tbn (default)
    Metadata:
      creation_time   : 2022-11-18T05:11:23.000000Z
      handler_name    : VideoHandle
      vendor_id       : [0][0][0][0]
      encoder         : Lavc59.37.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
      displaymatrix: rotation of -0.00 degrees
  Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      creation_time   : 2022-11-18T05:11:23.000000Z
      handler_name    : SoundHandle
      vendor_id       : [0][0][0][0]
      encoder         : Lavc59.37.100 aac
frame=    0 fps=0.0 q=0.0 Lsize=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
[aac @ 0x7fcb4d10c840] Qavg: nan


  


• Add a sample "CAMM" data to specific PTS in a MP4 file

  11 janvier 2023, par Cheloute

  For testing purpose, I need to add programatically some samples to an existing MP4 video file but I can't understand how.
My goal is to add some CAMM1 records (exposure data) associated to each PTS multiple of 33366, that's to say : PTS=0, PTS=33366, PTS=66732, ...

  


  I already have an existing camm track atom in my file, so the idea is to duplicate all the existing CAMM samples (CAMM2 and CAMM3 data), add my CAMM1 samples to the existing CAMM data, and write all the samples again at the end of the mdat atom (moov atom is located after mdat atom in my case). Next I'll update the CAMM track atom (stts, stsc, stsz and stco) to index all the samples correctly.

  


  But I have 1 question I can't understand. STSC and STCO are dealing with offsets and STTS with time and delta, how can I do to link my CAMM1 records to PTS multiple of 33366 ?

  


  Thanks

  


• What is the right way to put data to abuffersrc and pull from abufersink when I have multiple inputs with FFMPEG "afir" filter ?

  19 décembre 2022, par Evgenii

  I want to understand why av_buffersink_get_frame() always return AVERROR(EAGAIN).
I use this algorithm :

  


  

  1. Open input file input.mp3, create decoder for input file

  


  2. Open signal file signal.wav, create decoder for signal file

  


  3. Create filter graph and inputs/outputs with function avfilter_graph_parse2("[in0][in1]afir[out], &inputs, &outputs")

  


  4. Create abuffersrc for every inputs with names "in0", "in1"

  


  5. Create one abuffersink for one outputs with name "out"

  


  6. Read and decode samples with methods av_read_frame(), avcodec_send_packet(), avcodec_receive_frame(), put samples to abuffersrc with av_buffersrc_add_frame() and trying to read samples from abuffersink with av_buffersink_get_frame() - HERE I get AVERROR(EAGAIN) for every call

  


  


  Please, help !

  


  I've tried to read all samples and push its to abuffersrc for input and signal pipes in first step and and call av_buffersink_get_frame one time in second step. I got AVERROR(EGAIN) again.

  


  I've tried to config two outputs with names "in0" and "in1" and one input with name "out" and call avfilter_graph_parse_ptr() as done in here :

  


  static AVFilterContext *init_buffersrc(AVCodecContext *decoder, AVFilterGraph *filter_graph, const char *pad_name) {
    AVFilterContext *buffersrc = NULL;
    uint8_t args[1024];

    snprintf(args, sizeof(args),
        "time_base=%d/%d:sample_rate=%d:sample_fmt=%s:channel_layout=0x%"PRIx64"",
        decoder->time_base.num, decoder->time_base.den, decoder->sample_rate, av_get_sample_fmt_name(decoder->sample_fmt), decoder->channel_layout);

    CHECK_AV(avfilter_graph_create_filter(&buffersrc, avfilter_get_by_name("abuffer"), pad_name, args, NULL, filter_graph));
    return buffersrc;
}

static AVFilterContext *init_buffersink(AVFilterGraph *filter_graph) {
    AVFilterContext *buffersink = NULL;

    CHECK_AV(avfilter_graph_create_filter(&buffersink, avfilter_get_by_name("abuffersink"), "out", NULL, NULL, filter_graph));
    return buffersink;
}

static void init_complex_graph(const char *desc, Context *ctx) {

    AVFilterGraph *filter_graph;
    AVFilterInOut *inputs = avfilter_inout_alloc();
    AVFilterInOut **outputs = (AVFilterInOut**) av_malloc(ctx->nb_input_files*sizeof(AVFilterInOut *));
    char *dump;
    uint8_t pad_name[64];

    filter_graph = ctx->filter_graph = avfilter_graph_alloc();
    filter_graph->nb_threads = 1;

    for (int i = 0; i< ctx->nb_input_files; ++i) {
        outputs[i] = avfilter_inout_alloc();
    }

    for (int i = 0; i < ctx->nb_input_files; ++i) {
        AVFilterContext *buffersrc;
        snprintf(pad_name, sizeof(pad_name), "in%d", i);        
        buffersrc = init_buffersrc(ctx->input_files[i]->decoder, filter_graph, pad_name);
        ctx->input_files[i]->buffersrc = buffersrc;
        outputs[i]->name = av_strdup(pad_name);
        outputs[i]->filter_ctx = buffersrc;
        outputs[i]->pad_idx = 0;
        if (i == ctx->nb_input_files - 1) {
            outputs[i]->next = NULL;
        }
        else {
            outputs[i]->next = outputs[i + 1];
        }
    }

    ctx->output_file->buffersink = init_buffersink(filter_graph);

    inputs->name = av_strdup("out");
    inputs->filter_ctx = ctx->output_file->buffersink;
    inputs->pad_idx =0;
    inputs->next = NULL;

    CHECK_AV(avfilter_graph_parse_ptr(filter_graph, desc, &inputs, outputs, NULL));

    CHECK_AV(avfilter_graph_config(filter_graph, NULL));
}   

// Call init_complex_graph("[in0][in1]afir[out]", SOME_CONTEXT);


  


  and still nothing.