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• Parsing SCTE-35 Data stream with FFMPEG

  7 avril 2023, par Alex Dube

  I'm trying to parse a data stream containing SCTE-35 info (or so I hope) coming from a .ts file obtained from a master .m3u8 playlist using FFMPEG.

  


  I'm using the following command to try and parse map the specific data stream to an outfile :

  


  ffmpeg -i https://stream-url/master/ts_file.ts -y -map 0:2 -c copy -copy_unknown -f data scte35data.bin


  


  My full error log as follows :

  


  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=/opt/homebrew/Cellar/ffmpeg/5.1.2_3 --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 --enable-neon
  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
[mpegts @ 0x155f04080] start time for stream 2 is not set in estimate_timings_from_pts
Input #0, mpegts, from 'https://rcavlive.akamaized.net/hls/live/704025/xcanrdi/20230320T065736/master_2000/00012/master_2000_01207.ts':
  Duration: 00:00:08.00, start: 10442.033333, bitrate: 2282 kb/s
  Program 1 
  Stream #0:0[0x1e1]: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p(progressive), 852x480 [SAR 1:1 DAR 71:40], Closed Captions, 30 fps, 30 tbr, 90k tbn
  Stream #0:1[0x1e2](fre): Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp, 127 kb/s
  Stream #0:2[0x1f4]: Data: scte_35
  Stream #0:3[0x1f6]: Data: timed_id3 (ID3  / 0x20334449)
Output #0, data, to 'RecordingScripts/Tests/1.bin':
  Metadata:
    encoder         : Lavf59.27.100
  Stream #0:0: Data: scte_35
Stream mapping:
  Stream #0:2 -> #0:0 (copy)
Press [q] to stop, [?] for help
size=       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
Output file is empty, nothing was encoded (check -ss / -t / -frames parameters if used)


  


• Checking if a video has a sound even if it has an audio codec ?

  19 janvier 2023, par Sreenivasan

  I am new to intermediate python and I am trying to find if a downloaded video has sound, every video I download has an audio codec but I want to get the decibel of sound that audio has in that particular video.

  


  For example, this 'FFmpeg' command line script allows me to get the full info :

  


  ffmpeg -hide_banner -i testvideo.mp4 -af volumedetect -vn -f null - 2>&1


  


  this yields the below result in my command prompt(windows user here with win 11)

  


  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'testvideo.mp4':

Metadata:

major_brand : mp42

minor_version : 0

compatible_brands: mp42mp41isomavc1

creation_time : 2022-04-12T23:21:45.000000Z

Duration: 00:00:40.58, start: 0.000000, bitrate: 4104 kb/s

Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709, progressive), 1920x1080, 3846 kb/s, 29.97 fps, 29.97 tbr, 30k tbn (default)

Metadata:

creation_time : 2022-04-12T23:21:45.000000Z

handler_name : L-SMASH Video Handler

vendor_id : [0][0][0][0]

encoder : AVC Coding

Stream #0:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 253 kb/s (default)

Metadata:

creation_time : 2022-04-12T23:21:45.000000Z

handler_name : L-SMASH Audio Handler

vendor_id : [0][0][0][0]

Stream mapping:

Stream #0:1 -> #0:0 (aac (native) -> pcm_s16le (native))

Press [q] to stop, [?] for help

Output #0, null, to 'pipe:':

Metadata:

major_brand : mp42

minor_version : 0

compatible_brands: mp42mp41isomavc1

encoder : Lavf59.35.100

Stream #0:0(und): Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s (default)

Metadata:

creation_time : 2022-04-12T23:21:45.000000Z

handler_name : L-SMASH Audio Handler

vendor_id : [0][0][0][0]

encoder : Lavc59.56.100 pcm_s16le

size=N/A time=00:00:40.55 bitrate=N/A speed=1.22e+03x

video:0kB audio:7608kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown

[Parsed_volumedetect_0 @ 0000026609be08c0] n_samples: 3895296

[Parsed_volumedetect_0 @ 0000026609be08c0] mean_volume: -91.0 dB

[Parsed_volumedetect_0 @ 0000026609be08c0] max_volume: -91.0 dB

[Parsed_volumedetect_0 @ 0000026609be08c0] histogram_91db: 3895296


  


  As you can see there are 'parsed_volumedetect' values with dB which has a mean value of -91 dB which means the audio has no sound, i.e., the video has audio but there is no sound.

  


  Now I am trying to do the same in python and I want to get just the mean volume value to be stored in a variable so that I can check if the video has any sound in it.

  


  I have seen the subprocess codes so far but when I try to run my code in VS-Code - python 3.11 :

  


  import subprocess    
result = subprocess.run(["ffmpeg", "-hide_banner", "-af", "volumedetect", "-vn", "-f", "null", "testvideo1.mp4"],
    stdout=subprocess.PIPE,
    stderr=subprocess.STDOUT,
    shell=True)
    print(result.stdout)


  


  It says that :

  


  PS C:\Users\balaj\OneDrive\Documents\Programming language\python files> c:; cd 'c:\Users\balaj\OneDrive\Documents\Programming language\python files'; & 'C:\Python311\python.exe' 'c:\Users\balaj\.vscode\extensions\ms-python.python-2022.20.2\pythonFiles\lib\python\debugpy\adapter/../..\debugpy\launcher' '51760' '--' 'c:\Users\balaj\OneDrive\Documents\Programming language\python files\devproject\sample.py'

b"Output #0, null, to 'testvideo1.mp4':\r\nOutput file #0 does not contain any stream\r\n"


  


  Any help is much appreciated. Sorry for the long post... TIA !!!

  


  Just a quick update :
The result is the same for video files that have sound(I tested in VLC) and don't have sound.

  


  Another update :
I have changed the subprocess.runcode to the exact same as I called in the cmd windows :

  


  result = subprocess.run(["ffmpeg", "-hide_banner","-i","testvideo-sound.mp4", "-af", "volumedetect", "-vn", "-f", "null", "-2>&1"]


  


  Now the result is this :

  


  b'The handle could not be duplicated\r\nduring redirection of handle 1.\r\n'


  


• why would ffmpeg rotate 2nd video on concatenation when I don't want it to or seemingly ask for it ?

  10 janvier 2023, par Pompey Magnus

  here is the command I run :

  


  ffmpeg -f concat -an -i ./files.txt ztestout.mp4


  


  I have about 5 videos, but just to test I did with two.
the 2nd video gets flipped upside down, even though opening each video in VLC opens and plays them correctly.

  


  Any ideas why it would do that ? Is the metadata wrong in the video ? I took all the videos I'm trying to concat with the same android phone.

  


  output below, and I noticed its says rotation zero degrees :

  


  ffmpeg version 5.1.2 Copyright (c) 2000-2022 the FFmpeg developers
  built with Apple clang version 14.0.0 (clang-1400.0.29.102)
  configuration: --prefix=/opt/homebrew/Cellar/ffmpeg/5.1.2 --enable-shared --enable-pthreads --enable-version3 --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librist --enable-librubberband --enable-libsnappy --enable-libsrt --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 --enable-neon
  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 @ 0x138804730] Auto-inserting h264_mp4toannexb bitstream filter
Input #0, concat, from './files.txt':
  Duration: N/A, start: 0.000000, bitrate: 17255 kb/s
  Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuvj420p(pc, smpte170m, progressive), 1920x1080, 16999 kb/s, SAR 1:1 DAR 16:9, 30.01 fps, 30 tbr, 90k tbn
    Metadata:
      creation_time   : 2023-01-08T13:32:50.000000Z
      handler_name    : VideoHandle
      vendor_id       : [0][0][0][0]
    Side data:
      displaymatrix: rotation of -180.00 degrees
  Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 256 kb/s
    Metadata:
      creation_time   : 2023-01-08T13:32:50.000000Z
      handler_name    : SoundHandle
      vendor_id       : [0][0][0][0]
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
Press [q] to stop, [?] for help
[libx264 @ 0x137f07fe0] using SAR=1/1
[libx264 @ 0x137f07fe0] using cpu capabilities: ARMv8 NEON
[libx264 @ 0x137f07fe0] profile High, level 4.0, 4:2:0, 8-bit
[libx264 @ 0x137f07fe0] 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=15 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=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 'ztestout.mp4':
  Metadata:
    encoder         : Lavf59.27.100
  Stream #0:0(eng): Video: h264 (avc1 / 0x31637661), yuvj420p(pc, smpte170m, progressive), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 30 fps, 15360 tbn
    Metadata:
      creation_time   : 2023-01-08T13:32:50.000000Z
      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
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x138904b40] Auto-inserting h264_mp4toannexb bitstream filterdrop=20 speed=3.67x    
frame=74497 fps=109 q=-1.0 Lsize= 1740353kB time=00:41:23.13 bitrate=5741.5kbits/s dup=0 drop=25 speed=3.64x    
video:1739531kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.047236%
[libx264 @ 0x137f07fe0] frame I:300   Avg QP:20.73  size:294110
[libx264 @ 0x137f07fe0] frame P:29265 Avg QP:23.65  size: 45500
[libx264 @ 0x137f07fe0] frame B:44932 Avg QP:27.95  size:  8045
[libx264 @ 0x137f07fe0] consecutive B-frames: 19.4%  0.4%  0.7% 79.5%
[libx264 @ 0x137f07fe0] mb I  I16..4:  5.5% 43.8% 50.7%
[libx264 @ 0x137f07fe0] mb P  I16..4:  0.2%  0.9%  0.7%  P16..4: 36.9% 13.9% 10.8%  0.0%  0.0%    skip:36.6%
[libx264 @ 0x137f07fe0] mb B  I16..4:  0.0%  0.1%  0.1%  B16..8: 30.0%  3.0%  1.3%  direct: 1.1%  skip:64.3%  L0:38.1% L1:55.8% BI: 6.1%
[libx264 @ 0x137f07fe0] 8x8 transform intra:49.7% inter:45.0%
[libx264 @ 0x137f07fe0] coded y,uvDC,uvAC intra: 84.0% 82.3% 41.9% inter: 12.8% 10.8% 0.5%
[libx264 @ 0x137f07fe0] i16 v,h,dc,p: 30% 17%  8% 45%
[libx264 @ 0x137f07fe0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 17% 25% 12%  4%  7%  7% 12%  7%  8%
[libx264 @ 0x137f07fe0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 21% 25% 12%  5%  7%  7% 10%  6%  8%
[libx264 @ 0x137f07fe0] i8c dc,h,v,p: 47% 22% 22%  9%
[libx264 @ 0x137f07fe0] Weighted P-Frames: Y:0.3% UV:0.0%
[libx264 @ 0x137f07fe0] ref P L0: 70.3% 10.7% 13.9%  5.0%  0.0%
[libx264 @ 0x137f07fe0] ref B L0: 91.8%  6.2%  2.0%
[libx264 @ 0x137f07fe0] ref B L1: 95.7%  4.3%
[libx264 @ 0x137f07fe0] kb/s:5738.58