如何使用ffprobe从HLS / M3U8文件中检测视频比特率

时间:2016-01-27 16:59:00

标签: ffmpeg video-streaming hls m3u8 ffprobe

我们需要使用HLS的{​​{1}}文件,使用ffprobe检测m3u8流的视频比特率

如果我使用.ts,我可以获得持续时间,尺寸,使用的编解码器,音频比特率,但响应中没有视频比特率m3u8提供。

ffprobe

在上面的示例中,我知道视频大约是520Kbps,但需要找到一种以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 } } 或任何其他方式以编程方式读取的方法。根据我目前的情况,我可以获得所需的大部分信息,但我错过了一个重要的值,即视频比特率

我可以尝试哪些其他选择?

谢谢!

3 个答案:

答案 0 :(得分:2)

对于视频比特率,您可以这样做:

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

获取一系列帧的压缩包大小和持续时间(以字节和秒为单位)。运行一段时间然后计算总持续时间的平均比特率。

答案 1 :(得分:1)

  

在上面的示例中,我知道视频大约是 520Kbps ,但需要   找到一种用ffprobe或任何方式以编程方式读取的方法   其他方式。

显示的HLS文件中的文字有一个条目: AVERAGE-BANDWIDTH:599686
FFProbe表示AAC音频比特率为: 79 kb / s

要获得视频比特率,您可以执行以下公式:

  

HLS平均带宽减去 FFProbe音频比特率 =估算的视频比特率

你的号码......(599686 - 79000)= 520686。

这实际上证实了您“我知道视频大约是520Kbps”。只需将HLS文本文件放入String并使用一些字符串函数(甚至正则表达式)来提取第一个数字。

希望它有所帮助。

答案 2 :(得分:1)

检测平均带宽的最佳方法是将ffmpeg和pv命令结合起来,如下所示:

apt-get install pv

您可能需要安装pv RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams(200, 200); lp.addRule(RelativeLayout.CENTER_IN_PARENT); // A position in layout. ImageView imageView = new ImageView(this); // initialize ImageView imageView.setLayoutParams(lp); // imageView.setScaleType(ImageView.ScaleType.FIT_CENTER); imageView.setImageResource(R.drawable.photo); RelativeLayout layout = (RelativeLayout) findViewById(R.id.layout); layout.addView(imageView); 希望它对你有所帮助。