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• FFMPEG reports different (wrong) video resolution compared to how it actually plays

  30 mars 2015, par Emiliano

  Quick question, i have a movie, which was cut and rendered with Sony Vegas from its original format to a .wmv file. Here comes the tricky part, movie when played, either with VLC or WMP, has a resolution of 656x480 ... BUT when i run a ffmpeg -i on it, it says it has a resolution of 600x480 ....

  I took the time of actually capturing a frame and croping it with photoshop and its 656 and not 600 like ffmpeg its reporting, why would this could be happening ? How could i fix the headers resolution ? Would that have any impact on video re-rendering ? As i said, VLC and WMP seems not to care about the incorrect headers and are playing it right, BUT, jwplayer seems to be using the header information, which i don’t blame him, its correct to do that, but why the video headers could be wrong ?

  ffmpeg -i trailer.wmv

  Input #0, asf, from ’trailer.wmv’ :
  Duration : 00:01:04.93, start : 3.000000, bitrate : 2144 kb/s
  Stream #0.0 : Audio : wmav2, 44100 Hz, mono, 32 kb/s
  Stream #0.1 : Video : wmv3, yuv420p, 600x480 [PAR 59:54 DAR 295:216], 2065 kb/
  s, 25.00 tb(r)

  And yeah, the PAR/DAR parameters are also wrong, but honestly, i don’t understand that technical shit, usually watch video and make sure it look good, any feedback would be appreciated :P

  Is there a way to change the container information with ffmpeg so applications that actually do use the container information don’t render video incorrectly ?

• Ffmpeg generate master playlist file in realtime

  18 août 2022, par user994461

  I have playing with ffmpeg and HLS adaptive encoding, i want to make it somehow to encode one by one resolution and make/update master playlist file in realtime..
Example, when 240p is done master playlist file will be updated and video can be played in 240p while 480p,720p and etc... is still encoding in background.

  


  I have try with this command and actualy this is working fine but not in way as i want...

  


  /home/test/ffmpeg -i 1.mp4 
-map 0:v:0 -map 0:a:0 -map 0:v:0 -map 0:a:0
-c:v h264 -profile:v main -crf 20 -sc_threshold 0 -g 48 -keyint_min 48 -c:a aac -ar 48000
-filter:v:0 scale="trunc(oh*a/2)*2:240" -maxrate:v:0 856k -bufsize:v:0 1200k -b:a:0 96k  
-filter:v:1 scale="trunc(oh*a/2)*2:480" -maxrate:v:1 1498k -bufsize:v:1 2100k -b:a:1 128k  
-var_stream_map "v:0,a:0,name:240p v:1,a:1,name:480p" 
-hls_time 4 -hls_list_size 0 -master_pl_name master.m3u8 -hls_segment_filename %v_%03d.ts %v.m3u8


  


  This command above encoding all resolutions in same time and must finish all before i can watch it.

  


  Any solution to make ffmpeg to encode 240p -> update playlist, encode 480p -> update playlist and etc...

  


• moviepy ruining video after combining them

  1er juin 2020, par jjakeryan

  I'm trying to make a program that downloads videos from TikTok and combines all the separate videos into one .mp4 file and moves the final video to a folder on my desktop. I've been able to make it download all the videos and when I watch the separate videos they play fine however when I combine the videos some of the videos are messed up and look like this but the audio is fine.

  



  #slecting all .mp4 files
    video_files = glob.iglob("*.mp4")

    print(video_files)
    clips = []

    for clip in video_files:  # For each mp4 file name
        clips.append(VideoFileClip(clip))  # Store them as a VideoFileClip and add to the clips list

    today = date.today()

    final = concatenate_videoclips(clips)  # Concatenate the VideoFileClips
    final.write_videofile(f"{today}.mp4", codec="libx264")


#moving completed video to folder on desktop
    shutil.move(f'{today}.mp4', '/Users/jacobmarrandio/Desktop/done_videos/')


  



  thanks for any help