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

Question

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!

Solution 1

the best way to detect the average bandwidth is combine ffmpeg and pv command like this:

ffmpeg  -re -i input.m3u8 -f flv - 2>/dev/null|pv -a >/dev/null

You may have to install pv apt-get install pv Hope it helped you.

Solution 2

For the video bitrate you can do:

ffprobe -select_streams v:0 -show_entries frame=pkt_size,pkt_duration_time <input>

to get the compressed packet sizes and durations (in bytes and respectively seconds) for a series of frames. Run it for a while then calculate the average bitrate for the total duration.

Solution 3

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.

The text in your shown HLS file has an entry: AVERAGE-BANDWIDTH : 599686
FFProbe says AAC audio bitrate is : 79 kb/s

To get the video bitrate you can do this formula:

HLS Average-Bandwidth minus FFProbe Audio-Bitrate = estimated video bitrate

With your numbers... (599686 - 79000) = 520686.

This actually confirms your "I know that video is around 520Kbps". Simply get the HLS text file into a String and use some String functions (or even Regular Expressions) to extract the first number.

Hope it helps.

Comments

[danday74]

where do you get 599686 from? thx

[VC.One]

@danday74 It was from the text of m3u8 file provided by Asker.