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  • Encode video with FFmpeg fps have been wrong

    7 novembre 2016, par Burak Hamuryen

    I’m trying to encod a video with FFmpeg but i have a problem about fps.
    So i build the sample code as follows

    AVCodec *codec;
    
AVCodecContext *c = NULL;
    
int i, ret, x, y, got_output;
    
FILE *f;
    
AVFrame *frame;
    
AVPacket pkt;
    
uint8_t endcode[] = { 0, 0, 1, 0xb7 };
    

    
printf("Encode video file %s\n", filename);
    

    
/* find the mpeg1 video encoder */
    
codec = avcodec_find_encoder((AVCodecID)codec_id);
    
if (!codec) {
    
    fprintf(stderr, "Codec not found\n");
    
    exit(1);
    
}
    

    
c = avcodec_alloc_context3(codec);
    
if (!c) {
    
    fprintf(stderr, "Could not allocate video codec context\n");
    
    exit(1);
    
}
    

    
/* put sample parameters */
    
c->bit_rate = 400000;
    
/* resolution must be a multiple of two */
    
c->width = 352;
    
c->height = 288;
    
/* frames per second */
    
c->time_base.num = 1;
    
c->time_base.den = 5; //changed
    

    
/* emit one intra frame every ten frames
    
* check frame pict_type before passing frame
    
* to encoder, if frame->pict_type is AV_PICTURE_TYPE_I
    
* then gop_size is ignored and the output of encoder
    
* will always be I frame irrespective to gop_size
    
*/
    
c->gop_size = 10;
    
c->max_b_frames = 1;
    
c->pix_fmt = AV_PIX_FMT_YUV420P;
    

    
if (codec_id == AV_CODEC_ID_H264)
    
    av_opt_set(c->priv_data, "preset", "slow", 0);
    

    
/* open it */
    
if (avcodec_open2(c, codec, NULL) < 0) {
    
    fprintf(stderr, "Could not open codec\n");
    
    exit(1);
    
}
    

    
f = fopen(filename, "wb");
    
if (!f) {
    
    fprintf(stderr, "Could not open %s\n", filename);
    
    exit(1);
    
}
    

    
frame = av_frame_alloc();
    
if (!frame) {
    
    fprintf(stderr, "Could not allocate video frame\n");
    
    exit(1);
    
}
    
frame->format = c->pix_fmt;
    
frame->width = c->width;
    
frame->height = c->height;
    

    
/* the image can be allocated by any means and av_image_alloc() is
    
* just the most convenient way if av_malloc() is to be used */
    
ret = av_image_alloc(frame->data, frame->linesize, c->width, c->height,
    
    c->pix_fmt, 32);
    
if (ret < 0) {
    
    fprintf(stderr, "Could not allocate raw picture buffer\n");
    
    exit(1);
    
}
    

    
/* encode 5 second of video */
    
for (i = 0; i < 25; i++) {
    
    av_init_packet(&pkt);
    
    pkt.data = NULL;    // packet data will be allocated by the encoder
    
    pkt.size = 0;
    

    
    fflush(stdout);
    
    /* prepare a dummy image */
    
    /* Y */
    
    for (y = 0; y < c->height; y++) {
    
        for (x = 0; x < c->width; x++) {
    
            frame->data[0][y * frame->linesize[0] + x] = x + y + i * 3;
    
        }
    
    }
    

    
    /* Cb and Cr */
    
    for (y = 0; y < c->height / 2; y++) {
    
        for (x = 0; x < c->width / 2; x++) {
    
            frame->data[1][y * frame->linesize[1] + x] = 128 + y + i * 2;
    
            frame->data[2][y * frame->linesize[2] + x] = 64 + x + i * 5;
    
        }
    
    }
    

    
    frame->pts = i;
    

    
    /* encode the image */
    
    ret = avcodec_encode_video2(c, &pkt, frame, &got_output);
    
    if (ret < 0) {
    
        fprintf(stderr, "Error encoding frame\n");
    
        exit(1);
    
    }
    

    
    if (got_output) {
    
        printf("Write frame %3d (size=%5d)\n", i, pkt.size);
    
        fwrite(pkt.data, 1, pkt.size, f);
    
        av_free_packet(&pkt);
    
    }
    
}
    

    
/* get the delayed frames */
    
for (got_output = 1; got_output; i++) {
    
    fflush(stdout);
    

    
    ret = avcodec_encode_video2(c, &pkt, NULL, &got_output);
    
    if (ret < 0) {
    
        fprintf(stderr, "Error encoding frame\n");
    
        exit(1);
    
    }
    

    
    if (got_output) {
    
        printf("Write frame %3d (size=%5d)\n", i, pkt.size);
    
        fwrite(pkt.data, 1, pkt.size, f);
    
        av_free_packet(&pkt);
    
    }
    
}
    

    
/* add sequence end code to have a real mpeg file */
    
fwrite(endcode, 1, sizeof(endcode), f);
    
fclose(f);
    

    
avcodec_close(c);
    
av_free(c);
    
av_freep(&frame->data[0]);
    
av_frame_free(&frame);
    
printf("\n");

    and I changed the following parts from the original

    c->time_base.num = 1;
    
c->time_base.den = 5;

    after these changes, i expect a video to be composed of 5 seconds and 5 fps.
    But when i play the output video file, the video ends in 1 2 seconds.
    The ffprob output of output video is as follows.

    Edit :
    ffprobe output added as a text

    ffprobe version 2.0.1 Copyright (c) 2007-2013 the FFmpeg developers
    
  built on Sep 26 2013 02:00:03 with gcc 4.8.1 (GCC)
    
  configuration: --disable-static --enable-shared --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
    
  libavutil      52. 38.100 / 52. 38.100
    
  libavcodec     55. 18.102 / 55. 18.102
    
  libavformat    55. 12.100 / 55. 12.100
    
  libavdevice    55.  3.100 / 55.  3.100
    
  libavfilter     3. 79.101 /  3. 79.101
    
  libswscale      2.  3.100 /  2.  3.100
    
  libswresample   0. 17.102 /  0. 17.102
    
  libpostproc    52.  3.100 / 52.  3.100
    
Input #0, h264, from 'C:\Users\bhamuryen\Desktop\Dev\Test\ffmpeg_test\ffmpeg_test\test.h264':
    
  Duration: N/A, bitrate: N/A
    
    Stream #0:0: Video: h264 (High), yuv420p, 352x288, 5 fps, 5 tbr, 1200k tbn, 10 tbc
    
[STREAM]
    
index=0
    
codec_name=h264
    
codec_long_name=H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10
    
profile=High
    
codec_type=video
    
codec_time_base=1/10
    
codec_tag_string=[0][0][0][0]
    
codec_tag=0x0000
    
width=352
    
height=288
    
has_b_frames=1
    
sample_aspect_ratio=0:1
    
display_aspect_ratio=0:1
    
pix_fmt=yuv420p
    
level=13
    
timecode=N/A
    
id=N/A
    
r_frame_rate=10/2
    
avg_frame_rate=5/1
    
time_base=1/1200000
    
start_pts=N/A
    
start_time=N/A
    
duration_ts=N/A
    
duration=N/A
    
bit_rate=N/A
    
nb_frames=N/A
    
nb_read_frames=N/A
    
nb_read_packets=N/A
    
DISPOSITION:default=0
    
DISPOSITION:dub=0
    
DISPOSITION:original=0
    
DISPOSITION:comment=0
    
DISPOSITION:lyrics=0
    
DISPOSITION:karaoke=0
    
DISPOSITION:forced=0
    
DISPOSITION:hearing_impaired=0
    
DISPOSITION:visual_impaired=0
    
DISPOSITION:clean_effects=0
    
DISPOSITION:attached_pic=0

    The output video file played with VLC and VLC statistic is as follows.

    vlc output

    As shown, i setted fps 5 but vlc read it like 10 fps also ffprobe say to us

    Stream #0:0 : Video : h264 (High), yuv420p, 352x288, 5 fps, 5 tbr, 1200k tbn, 10 tbc

    and

    codec_time_base=1/10

    i think the important thing is codec_time_base=1/10 and 10 tbc.
    What is wrong in this code ? i don’t know exactly the reason for the problem.
    How can i create a video(5 fps -10 fps or custom fps) and play correctly the created video ?

    Thanks for your help.

  • How to detect video bitrate from HLS/M3U8 file using ffprobe

    23 août 2016, par Guillermo

    We need to detect the video bitrate of a HLS stream with ffprobe by using the m3u8 file of the .ts.

    If I use the m3u8, I can get the duration, dimensions, codecs used, audio bitrate, but no video bitrate is available in the response provided by ffprobe.

    ffprobe -print_format json -show_format -show_streams -show_error http://gfrmedia-video-platform.s3.amazonaws.com/bumbia/2014/06/06/158217_20160126214307_bumbia-hls/hls1056k/158217_640x360-with-mp4-hls_bumbia-hls.m3u8
    

    
ffprobe version 2.8.3 Copyright (c) 2007-2015 the FFmpeg developers
    
  built with Apple LLVM version 7.0.0 (clang-700.1.76)
    
  configuration: --prefix=/usr/local/Cellar/ffmpeg/2.8.3 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-opencl --enable-libx264 --enable-libmp3lame --enable-libvo-aacenc --enable-libxvid --enable-vda
    
  libavutil      54. 31.100 / 54. 31.100
    
  libavcodec     56. 60.100 / 56. 60.100
    
  libavformat    56. 40.101 / 56. 40.101
    
  libavdevice    56.  4.100 / 56.  4.100
    
  libavfilter     5. 40.101 /  5. 40.101
    
  libavresample   2.  1.  0 /  2.  1.  0
    
  libswscale      3.  1.101 /  3.  1.101
    
  libswresample   1.  2.101 /  1.  2.101
    
  libpostproc    53.  3.100 / 53.  3.100
    
{
    
[http @ 0x7fcf09e19420] No trailing CRLF found in HTTP header.
    
Input #0, hls,applehttp, from 'http://gfrmedia-video-platform.s3.amazonaws.com/bumbia/2014/06/06/158217_20160126214307_bumbia-hls/hls1056k/158217_640x360-with-mp4-hls_bumbia-hls.m3u8':
    
  Duration: 00:00:11.00, start: 9.940500, bitrate: 0 kb/s
    
  Program 0
    
    Metadata:
    
      variant_bitrate : 0
    
    Stream #0:0: Video: h264 (Constrained Baseline) ([27][0][0][0] / 0x001B), yuv420p, 640x360 [SAR 1:1 DAR 16:9], 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc
    
    Stream #0:1: Audio: aac (LC) ([15][0][0][0] / 0x000F), 44100 Hz, stereo, fltp, 79 kb/s
    
    "streams": [
    
        {
    
            "index": 0,
    
            "codec_name": "h264",
    
            "codec_long_name": "H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10",
    
            "profile": "Constrained Baseline",
    
            "codec_type": "video",
    
            "codec_time_base": "1001/60000",
    
            "codec_tag_string": "[27][0][0][0]",
    
            "codec_tag": "0x001b",
    
            "width": 640,
    
            "height": 360,
    
            "coded_width": 640,
    
            "coded_height": 368,
    
            "has_b_frames": 0,
    
            "sample_aspect_ratio": "1:1",
    
            "display_aspect_ratio": "16:9",
    
            "pix_fmt": "yuv420p",
    
            "level": 30,
    
            "chroma_location": "left",
    
            "refs": 1,
    
            "is_avc": "0",
    
            "nal_length_size": "0",
    
            "r_frame_rate": "30000/1001",
    
            "avg_frame_rate": "30000/1001",
    
            "time_base": "1/90000",
    
            "start_pts": 900000,
    
            "start_time": "10.000000",
    
            "bits_per_raw_sample": "8",
    
            "disposition": {
    
                "default": 0,
    
                "dub": 0,
    
                "original": 0,
    
                "comment": 0,
    
                "lyrics": 0,
    
                "karaoke": 0,
    
                "forced": 0,
    
                "hearing_impaired": 0,
    
                "visual_impaired": 0,
    
                "clean_effects": 0,
    
                "attached_pic": 0
    
            }
    
        },
    
        {
    
            "index": 1,
    
            "codec_name": "aac",
    
            "codec_long_name": "AAC (Advanced Audio Coding)",
    
            "profile": "LC",
    
            "codec_type": "audio",
    
            "codec_time_base": "1/44100",
    
            "codec_tag_string": "[15][0][0][0]",
    
            "codec_tag": "0x000f",
    
            "sample_fmt": "fltp",
    
            "sample_rate": "44100",
    
            "channels": 2,
    
            "channel_layout": "stereo",
    
            "bits_per_sample": 0,
    
            "r_frame_rate": "0/0",
    
            "avg_frame_rate": "0/0",
    
            "time_base": "1/90000",
    
            "start_pts": 894645,
    
            "start_time": "9.940500",
    
            "bit_rate": "79931",
    
            "disposition": {
    
                "default": 0,
    
                "dub": 0,
    
                "original": 0,
    
                "comment": 0,
    
                "lyrics": 0,
    
                "karaoke": 0,
    
                "forced": 0,
    
                "hearing_impaired": 0,
    
                "visual_impaired": 0,
    
                "clean_effects": 0,
    
                "attached_pic": 0
    
            }
    
        }
    
    ],
    
    "format": {
    
        "filename": "http://gfrmedia-video-platform.s3.amazonaws.com/bumbia/2014/06/06/158217_20160126214307_bumbia-hls/hls1056k/158217_640x360-with-mp4-hls_bumbia-hls.m3u8",
    
        "nb_streams": 2,
    
        "nb_programs": 1,
    
        "format_name": "hls,applehttp",
    
        "format_long_name": "Apple HTTP Live Streaming",
    
        "start_time": "9.940500",
    
        "duration": "11.000000",
    
        "size": "281",
    
        "bit_rate": "204",
    
        "probe_score": 100
    
    }
    
}

    In this sample above, I know that video is around 520Kbps, but need to find a way to read that programatically with either ffprobe or any other way. With what I currently have I can get most of the information needed, but I’m missing one important value that is the video bitrate.

    What other options could I try ?

    Thanks !

  • How does ffprobe determine duration ?

    26 octobre 2015, par jasongullickson

    I’m using ffprobe to analyze media files stored on a remote server. This seems to work well, but for some files the duration is missing or incorrect (usually longer than it should be). Other times it returns this information accurately, and it doesn’t seem to be related to the media type (codec, etc.).

    Here’s an example of a command that works :

    ffprobe -v quiet -print_format json -show_streams -show_format http://host.com/file.aiff

    {
    
"streams": [
    
    {
    
        "index": 0,
    
        "codec_name": "pcm_s16be",
    
        "codec_long_name": "PCM signed 16-bit big-endian",
    
        "codec_type": "audio",
    
        "codec_time_base": "1/44100",
    
        "codec_tag_string": "[0][0][0][0]",
    
        "codec_tag": "0x0000",
    
        "sample_fmt": "s16",
    
        "sample_rate": "44100",
    
        "channels": 2,
    
        "bits_per_sample": 16,
    
        "r_frame_rate": "0/0",
    
        "avg_frame_rate": "0/0",
    
        "time_base": "1/44100",
    
        "start_pts": 0,
    
        "start_time": "0.000000",
    
        "duration_ts": 8494248,
    
        "duration": "192.613333",
    
        "bit_rate": "1411200",
    
        "nb_frames": "8494248",
    
        "disposition": {
    
            "default": 0,
    
            "dub": 0,
    
            "original": 0,
    
            "comment": 0,
    
            "lyrics": 0,
    
            "karaoke": 0,
    
            "forced": 0,
    
            "hearing_impaired": 0,
    
            "visual_impaired": 0,
    
            "clean_effects": 0,
    
            "attached_pic": 0
    
        }
    
    }
    
],
    
"format": {
    
    "filename": "http://host.com/file.aiff",
    
    "nb_streams": 1,
    
    "nb_programs": 0,
    
    "format_name": "aiff",
    
    "format_long_name": "Audio IFF",
    
    "start_time": "0.000000",
    
    "duration": "192.613333",
    
    "probe_score": 100
    
}
    
}

    Here’s an example of one that doesn’t :

    ffprobe -v quiet -print_format json -show_streams -show_format "http://host.com/file.wav"

    Which generates this result :

    {
    
"streams": [
    
    {
    
        "index": 0,
    
        "codec_name": "pcm_s16le",
    
        "codec_long_name": "PCM signed 16-bit little-endian",
    
        "codec_type": "audio",
    
        "codec_time_base": "1/44100",
    
        "codec_tag_string": "[1][0][0][0]",
    
        "codec_tag": "0x0001",
    
        "sample_fmt": "s16",
    
        "sample_rate": "44100",
    
        "channels": 2,
    
        "bits_per_sample": 16,
    
        "r_frame_rate": "0/0",
    
        "avg_frame_rate": "0/0",
    
        "time_base": "1/44100",
    
        "bit_rate": "1411200",
    
        "disposition": {
    
            "default": 0,
    
            "dub": 0,
    
            "original": 0,
    
            "comment": 0,
    
            "lyrics": 0,
    
            "karaoke": 0,
    
            "forced": 0,
    
            "hearing_impaired": 0,
    
            "visual_impaired": 0,
    
            "clean_effects": 0,
    
            "attached_pic": 0
    
        }
    
    }
    
],
    
"format": {
    
    "filename": "http://host.com/file.wav",
    
    "nb_streams": 1,
    
    "nb_programs": 0,
    
    "format_name": "wav",
    
    "format_long_name": "WAV / WAVE (Waveform Audio)",
    
    "bit_rate": "1411200",
    
    "probe_score": 99
    
}
    
}

    These two examples are different formats, but I’ve seen it work and not work when the format is the same, I just don’t have an example handy.

    What I’d like to know is if there is something I can change about the parameters I’m using with ffprobe to allow the duration to be determined consistently and accurate, or any information I can find as to how ffprobe works so I figure out how I might change the input files, etc. so they work correctly.

    Alternatively, if there is a different tool that works more reliably (it would need to be an open-source Linux tool) any suggestions or recommendations are welcome.

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