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• moviepy output video only has sound in vs code and chrome but not in quicktime (the mac video player)

  24 janvier 2023, par UrLocalGoose

  I am using moviepy to make simple videos that require adding background music to a video. I have built essentially the whole application but I ran into a problem when showing people the videos. I tried emailing myself the video and it didn't have any sound, then I tried to play the video with the built in mac video player, quicktime, and it didn't have any sound, however, when I played the video in vs code's video player it worked perfectly, I also used the file path to view the video in chrome, and that worked too. I suspect that it has something to do with the encoding but I am a novice when it comes to video and audio encoding. This is what my code looks like :

  


  from moviepy.editor import *

background_video = VideoFileClip("./background.mp4")

background_music_audio = AudioFileClip("./music.wav")

comp = background_video.set_audio(background_music_audio)

comp.write_videofile("./test.mp4")


  


  I tried to make a video with background music but it had no sound

  


• ffmpeg stream to youtube has no sound with bigger mp4 file

  6 janvier 2023, par Alessandro Oliverio

  I want to stream to Youtube from a Ubuntu VPS and it works, but when i set a bigger .mp4 file (220mb) the livestream on Youtube has no sound.

  


  I tried to split the .mp4 file to 5s parts and concat them but without success.

  


  My settings are :

  


  FPS="30"                                       # FPS de la vidéo en sortie
QUAL="superfast"                                  # Preset de qualité FFMPEG
YOUTUBE_URL="rtmp://a.rtmp.youtube.com/live2"  # URL de base RTMP youtube

              # Source UDP (voir les annonces SAP)
KEY="###-my-key-###"                                     # Clé à récupérer sur>
VSOURCE="parts/files.txt"
ASOURCE="1m.mp3"

ffmpeg \
    -stream_loop -1 -f concat -i "$VSOURCE" -deinterlace \
    -stream_loop  -1 -i "$ASOURCE" \
    -vcodec libx264 -pix_fmt yuv420p -preset $QUAL -r $FPS -g $(($FPS * 2)) -b:v $VBR \
    -acodec libmp3lame -ar 44100 -threads 6 -qscale 3 -b:a 712000 -bufsize 512k \
    -f flv "$YOUTUBE_URL/$KEY"


  


  Hope someone can help me :)

  


  I tried to split the .mp4 file to 5s parts and concat them but without success.

  


• How to convert short video clips to TS without sound "gaps" between the segments ?

  10 novembre 2022, par Zvika

  I am trying to convert a sequence of short video files from MP4 to TS using ffmpeg.
I get valid TS files, but when playing them in any HLS player, there is a noticeable short gap in the sound between segment to segment.

  


  If I first stitch all the short video files to a single video file, and convert this file to TS while slicing it to segments, it plays perfectly fine.

  


  To the gory details :
My software creates short video clips that should be concateenated to an output video and streamed as HLS.
Each short clip is an H.264 video file and WAV audio file (I can create other formats if needed).
I then convert each such pair of H.264+WAV to a TS file using ffmpeg :
ffmpeg -y -i seg_0.mp4 -i seg_0.wav -c:a libvo_aacenc -c:v copy -bsf:v h264_mp4toannexb seg_0.ts ffmpeg -y -i seg_1.mp4 -i seg_1.wav -c:a libvo_aacenc -c:v copy -bsf:v h264_mp4toannexb -output_ts_offset 2.01 seg_1.ts ffmpeg -y -i seg_2.mp4 -i seg_2.wav -c:a libvo_aacenc -c:v copy -bsf:v h264_mp4toannexb -output_ts_offset 4.02 seg_2.ts
etc.

  


  and I create an appropriate M3U8 file to play all the short clips as a sequence.
The result is not satisfying, as I have audio gaps between each segment and segment, as you can hear here :
https://rnd3-temp-public.s3.amazonaws.com/HLS_4/out_seg2.m3u8

  


  However, if I concat all the pairs together, and convert the concatenated sequence to TS, while requesting ffmpeg to slice them again to segments, using a command like :
ffmpeg -y -f concat -i mp4_list.txt -f concat -i wav_list.txt -c:a libvo_aacenc -c:v copy -bsf:v h264_mp4toannexb -flags +cgop -g 30 -hls_time 2 out2.m3u8
it plays perfectly OK, as you can hear here :
https://rnd3-temp-public.s3.amazonaws.com/HLS/out2.m3u8

  


  How can I get a clear audio output by still encoding each segment separately ? (It's crucial for my workflow)

  


  Thanks !