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• Encoding from FFMPEG to MPEG-DASH, WebM with Keyframe Clusters to work with MediaSource API

  1er mai 2016, par Chris Nolet

  I’m currently sending a video stream to Chrome, to play via the MediaSource API.

  As I understand it, MediaSource only supports MP4 files encoded with MPEG-DASH, or WebM files that have clusters beginning with keyframes (otherwise it raises the error : Media segment did not begin with keyframe).

  Is there any way to encode in MPEG-DASH or keyframed WebM formats with FFMPEG in real-time ?

  EDIT :

  I just tried it with ffmpeg ... -f webm -vcodec vp8 -g 1 ... so that every frame is a keyframe. Not the ideal solution. It does work with MediaStream now though. Any way to sync up the segments with the keyframes in WebM so not every frame needs to be a keyframe ?

  ---

  Reference Questions on WebM / MP4 and MediaSource :

  Media Source Api not working for a custom webm file (Chrome Version 23.0.1271.97 m)

  MediaSource API and mp4

• ffmpeg is not running from php exec() function, work from command line

  6 mars 2016, par Thanigaivelan

  When i run the ffmpeg command it is working from command line. but when i try from php exec(). it returns 127 error.

  my ffmpeg

  root@w1 [/]# which ffmpeg
  
  /root/bin/ffmpeg

  this is my code

  ffmpeg-y -i /home/castbox/public_html/IGVideo/upload/tamil/videos/testing/test_ig.mp4 -acodec libfdk_aac -ab 24k -ar 44100 -c:v libx264 -pix_fmt yuv420p -profile:v baseline -level 31 -b:v 200k -g 72 -f hls -hls_time 3 -hls_list_size 999 -s 426x240 /home/castbox/public_html/IGVideo/upload/tamil/videos/testing/test_ig-240-index.m3u8
  
  
  
  when i run this code in from command line it work fine. but when try to run from php exec i am getting failed, it returns 127.

  i had tried like this also

  /path/to/ffmpeg-y -i /home/castbox/public_html/IGVideo/upload/tamil/videos/testing/test_ig.mp4 -acodec libfdk_aac -ab 24k -ar 44100 -c:v libx264 -pix_fmt yuv420p -profile:v baseline -level 31 -b:v 200k -g 72 -f hls -hls_time 3 -hls_list_size 999 -s 426x240 /home/castbox/public_html/IGVideo/upload/tamil/videos/testing/test_ig-240-index.m3u8

  Where is my mistake ?

• Cannot seem to work with mp3 files in pydub

  14 janvier 2023, par NegativePotato

  I have been trying to open mp3 files on pydub, I have ffmpeg in path and whatnot, but I get errors whenever I attempt to use pydub with mp3 files. Wav files work fine of course.
This is my code for testing purposes (copied directly from online) :

  


  from os import path
from pydub import AudioSegment

# files                                                                         
src = "Meet.mp3"
dst = "test.wav"

# convert wav to mp3                                                            
sound = AudioSegment.from_mp3(src)
sound.export(dst, format="wav")


  


  And this is my output for that code :

  


  C:\Users\aiden\OneDrive\Desktop\VietnameseAudioConnector>py test.py&#xA;Traceback (most recent call last):&#xA;  File "C:\Users\aiden\OneDrive\Desktop\VietnameseAudioConnector\test.py", line 9, in <module>&#xA;    sound = AudioSegment.from_mp3(src)&#xA;            ^^^^^^^^^^^^^^^^^^^^^^^^^^&#xA;  File "C:\Users\aiden\AppData\Local\Programs\Python\Python311\Lib\site-packages\pydub\audio_segment.py", line 796, in from_mp3&#xA;    return cls.from_file(file, &#x27;mp3&#x27;, parameters=parameters)&#xA;           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^&#xA;  File "C:\Users\aiden\AppData\Local\Programs\Python\Python311\Lib\site-packages\pydub\audio_segment.py", line 773, in from_file&#xA;    raise CouldntDecodeError(&#xA;pydub.exceptions.CouldntDecodeError: Decoding failed. ffmpeg returned error code: 1&#xA;&#xA;Output from ffmpeg/avlib:&#xA;&#xA;ffmpeg version 2023-01-12-git-fc263f073e-full_build-www.gyan.dev Copyright (c) 2000-2023 the FFmpeg developers&#xA;  built with gcc 12.2.0 (Rev7, Built by MSYS2 project)&#xA;  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-bzlib --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libaribb24 --enable-libdav1d --enable-libdavs2 --enable-libuavs3d --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxvid --enable-libaom --enable-libjxl --enable-libopenjpeg --enable-libvpx --enable-mediafoundation --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-liblensfun --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libvpl --enable-libshaderc --enable-vulkan --enable-libplacebo --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint&#xA;  libavutil      57. 43.100 / 57. 43.100&#xA;  libavcodec     59. 56.100 / 59. 56.100&#xA;  libavformat    59. 35.100 / 59. 35.100&#xA;  libavdevice    59.  8.101 / 59.  8.101&#xA;  libavfilter     8. 53.100 /  8. 53.100&#xA;  libswscale      6.  8.112 /  6.  8.112&#xA;  libswresample   4.  9.100 /  4.  9.100&#xA;  libpostproc    56.  7.100 / 56.  7.100&#xA;[mp3 @ 000002d24d29e500] Failed to read frame size: Could not seek to 44209.&#xA;Meet.mp3: Invalid argument&#xA;</module>

  


  Sorry if this ends up being obvious, I am new to using python. Thank you for the help !