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• Pydub AudioSegment.from_file() fails for mp3 audio file : Decoding failed. ffmpeg returned error code : 1,

  27 mars 2021, par Nisuga Jayawardana

  Couldn't find any fix. Looks like a bug. How to fix this ?

  


      # Grab the file from the request
    file_uploaded = request.FILES.get('sourceFile')
    file_path = uploads_base_path + file_uploaded.name
    
    # saving the uploaded file
    open(file_path, 'wb')

    extension = file_uploaded.name.split('.')[-1]
    with open(file_path, "rb") as wav_file:
        audio_segment = AudioSegment.from_file(wav_file, format=extension)    <-------------Error

    # create .wav filename for the file
    wavFileName = uploads_base_path + 'out.wav'
    print(wavFileName)

    # convert audio file to .wav type
    audio_segment.export(wavFileName,"wav")


  


  // Pydub Error
  
Decoding failed. ffmpeg returned error code : 1
  
Output from ffmpeg/avlib :
  
ffmpeg version N-101739-gcad3a5d715 Copyright (c) 2000-2021 the FFmpeg developers
  
built with gcc 9.3-win32 (GCC) 20200320

  


  // FFMPEG Error
  
[cache @ 000001c52157fdc0] Inner protocol failed to seekback end : -40
  
Last message repeated 1 times
  
[mp3 @ 000001c52157f400] Failed to read frame size : Could not seek to 1026.
  
[cache @ 000001c52157fdc0] Statistics, cache hits:0 cache misses:0
  
cache:pipe:0 : Invalid argument

  


• How to generate a video by looping an image and then concat with another very long video without re-encoding using ffmpeg ?

  23 mars 2021, par Linghao Chen

  I have an image and a very long video (1.5h).
Now I want to generate a heading video about 5 seconds by looping the image, and then concatenate it with the long video. Since the video is long, I don't want to re-encode the videos.
I have tried to generate the heading video using

  


  ffmpeg -loop 1 -i image.png -c:v libx264 -t 5 -pix_fmt yuv420p head.mp4


  


  and then

  


  ffmpeg -f concat -i list.txt -c:v copy concat.mp4


  


  where the list.txt contains

  


  file head.mp4
file longvideo.mp4


  


  I have tried these operations on two machines.
On one machine, the concatenated video has no audio. Moreover, it stucks at 5-10 seconds and directly jump to 11s.
On the other machine, the video and audio are not synchronized.

  


  To provide more information, I have checked the codecs of the two videos by

  


  ffprobe -v error -select_streams v:0 -show_entries stream=codec_name \
  -of default=noprint_wrappers=1:nokey=1 xxxxx.mp4


  


  Both of them are h264.

  


  My question is, how to generate it correctly with ffmpeg ? If it is hard using ffmpeg, is there any method to do it fast ? As far as I know, Adobe Premiere and Final Cut Pro do not export as fast as I expect because they re-encode the videos.

  


• How to concat MTS videos and apply filters without re-encoding using FFmpeg ?

  20 mars 2021, par Karp

  I have a txt file with many MTS video files. I want to merge them all together using FFmpeg and get one big MTS file. But I want to apply fade-in and fade-out to the final video. Can I do it without re-encoding ? Because re-encoding takes a lot of time, but I need to do it fast.

  


  Edit

  


  Here is the output when I run

  


  ffmpeg -i C:/Users/aleks/Downloads/IMPORTANT/MTS_videos/my.MTS


  


  Output :

  


  Input #0, mpegts, from 'C:/Users/aleks/Downloads/IMPORTANT/MTS_videos/my.MTS':
  Duration: 00:00:08.51, start: 1.433367, bitrate: 5275 kb/s
  Program 1
    Metadata:
      service_name    : Service01
      service_provider: FFmpeg
    Stream #0:0[0x100]: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p(tv, bt709, progressive), 1920x1080, 59.94 fps, 59.94 tbr, 90k tbn, 120k tbc


  


  Edit 2

  


  ok, I think I figured it out. The problem was in audio codec, I added -c:a mp3 and it seems to be working. However now I have the second problem. I have 3 videos. I apply fade in to the first one, fade out to the third one and nothing to the second one. I get them from one video by slicing using this command 3 times

  


  ffmpeg -i 'C:/Users/aleks/Downloads/video.MTS' -ss 20 -t 5 -c copy 'C:/Users/aleks/Downloads/third.MTS'


  


  But when I run it my video is 2 seconds long (it must be 5 seconds long). Can you help me with fixing this problem.

  


  PS. i have seen similar question and there was a suggestion to add -async 1. It didn't help. And moving -t 5 to the position before -i didn't help as well.

  


  Also if I delete -c copy everything works fine. But I need to keep it because I don't want to re-encode.