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• How to fix the ffmpeg python issue "Error applying option 'original_size' to filter 'ass' : Invalid argument" ?

  16 février, par Gauthier Buttez

  ENVIRONMENT :

  


  Python 3.10

  


  Windows 11

  


  ffmpeg-python==0.2.0

  


  CONTEXT :

  


  I am trying to add hardcoded subtitles on a video with ffmpeg and Pyton.

  


  PROBLEM :

  


  ffmpeg is not able to find the path of my ass subtitle file. So I tried different ways with different methods. I asked different AI to try to find a solution. Impossible ! It is such a crazy issue that I tested the code from a "test" folder located on the root "C :" from the command line wid nows. No AI was able to fixed this issue. I tried chatGPT, deepseek, claude.ai. They proposed different solutions which were not working.

  


  THE CODE :

  


  import os
import ffmpeg
import subprocess

def add_subtitles_with_ass(video_path, ass_path, output_path):

    video_path = os.path.abspath(video_path)
    ass_path = os.path.abspath(ass_path)
    output_path = os.path.abspath(output_path)

    print(f"🚀 Add susbtitiles with ASS : {ass_path}")
    ass_path_escaped = rf'"{ass_path}"'

    try:
        ffmpeg.input(video_path).output(output_path, vf=f"ass='{ass_path_escaped}'").run(overwrite_output=True)
        print(f"✅ Subtitles added with success : {output_path}")
    except Exception as e:
        print(f"❌ ERROR when adding subtitles : {e}")


def add_subtitles_with_ass_with_subprocess(video_path, ass_path, output_path):
    video_path = os.path.abspath(video_path)
    ass_path = os.path.abspath(ass_path)
    output_path = os.path.abspath(output_path)

    print(f"🚀 Add subtitles with ASS : {ass_path}")

    try:
        command = [
            'ffmpeg',
            '-i', video_path,
            '-vf', f"ass='{ass_path}'",
            '-c:a', 'copy',
            output_path,
            '-y'  # Overwrite output file without asking
        ]

        subprocess.run(command, check=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
        print(f"✅ Subtitles added with success : {output_path}")
    except subprocess.CalledProcessError as e:
        print(f"❌ ERROR when adding subtitles : {e.stderr.decode('utf-8')}")


print(f"Test 1 -----------------------------------------------------------------------")
ass_path="G:\Mi unidad\Python\Scripts\shorts_videos\10000views_and_higher\Li2zY7XcOf0_Matthew_Hussey_flip_h_BW_with_logo_EN.ass"
video_path="G:\Mi unidad\Python\Scripts\shorts_videos\10000views_and_higher\Li2zY7XcOf0_Matthew_Hussey_flip_h_BW_with_logo.mp4"
output_path="G:\Mi unidad\Python\Scripts\shorts_videos\10000views_and_higher\Li2zY7XcOf0_Matthew_Hussey_flip_h_BW_with_logo_EN.mp4"
add_subtitles_with_ass(video_path, ass_path, output_path)
print(50*"*")
print(50*"*")
print(50*"*")

print(f"Test 2 -----------------------------------------------------------------------")
ass_path2="G:\\Mi unidad\\Python\\Scripts\\shorts_videos\\10000views_and_higher\\Li2zY7XcOf0_Matthew_Hussey_flip_h_BW_with_logo_EN.ass"
video_path2="G:\\Mi unidad\\Python\\Scripts\\shorts_videos\\10000views_and_higher\\Li2zY7XcOf0_Matthew_Hussey_flip_h_BW_with_logo.mp4"
output_path2="G:\\Mi unidad\\Python\\Scripts\\shorts_videos\\10000views_and_higher\\Li2zY7XcOf0_Matthew_Hussey_flip_h_BW_with_logo_EN.mp4"
add_subtitles_with_ass(video_path2, ass_path2, output_path2)

print(50*"*")
print(50*"*")
print(50*"*")

print(f"Test 3 -----------------------------------------------------------------------")
ass_path3="G:/\Mi unidad/\Python/\Scripts/\shorts_videos/\10000views_and_higher/\Li2zY7XcOf0_Matthew_Hussey_flip_h_BW_with_logo_EN.ass"
video_path3="G:/\Mi unidad/\Python/\Scripts/\shorts_videos/\10000views_and_higher/\Li2zY7XcOf0_Matthew_Hussey_flip_h_BW_with_logo.mp4"
output_path3="G:/\Mi unidad/\Python/\Scripts/\shorts_videos/\10000views_and_higher/\Li2zY7XcOf0_Matthew_Hussey_flip_h_BW_with_logo_EN.mp4"
add_subtitles_with_ass(video_path3, ass_path3, output_path3)

print(50*"*")
print(50*"*")
print(50*"*")

print(f"Test 4 -----------------------------------------------------------------------")
ass_path4="G:/\\Mi unidad/\\Python/\\Scripts/\\shorts_videos/\\10000views_and_higher/\\Li2zY7XcOf0_Matthew_Hussey_flip_h_BW_with_logo_EN.ass"
video_path4="G:/\\Mi unidad/\\Python/\\Scripts/\\shorts_videos/\\10000views_and_higher/\\Li2zY7XcOf0_Matthew_Hussey_flip_h_BW_with_logo.mp4"
output_path4="G:/\\Mi unidad/\\Python/\\Scripts/\\shorts_videos/\\10000views_and_higher/\\Li2zY7XcOf0_Matthew_Hussey_flip_h_BW_with_logo_EN.mp4"
add_subtitles_with_ass(video_path4, ass_path4, output_path4)




print(f"Test 1 with subprocess -----------------------------------------------------------------------")
add_subtitles_with_ass_with_subprocess(video_path, ass_path, output_path)
print(50*"*")
print(50*"*")
print(50*"*")

print(f"Test 2 with subprocess -----------------------------------------------------------------------")
add_subtitles_with_ass_with_subprocess(video_path2, ass_path2, output_path2)
print(50*"*")
print(50*"*")
print(50*"*")

print(f"Test 3 with subprocess -----------------------------------------------------------------------")
add_subtitles_with_ass_with_subprocess(video_path3, ass_path3, output_path3)
print(50*"*")
print(50*"*")
print(50*"*")

print(f"Test 4 with subprocess -----------------------------------------------------------------------")
add_subtitles_with_ass_with_subprocess(video_path4, ass_path4, output_path4)
print(50*"*")
print(50*"*")
print(50*"*")

#======================= IT DIDN'T WORK, SO LET'S DO WITH RELATIVE PATH ===================================


print(f"Test 1 with relative path -----------------------------------------------------------------------")
ass_path_relative="10000views_and_higher\Li2zY7XcOf0_Matthew_Hussey_flip_h_BW_with_logo_EN.ass"
video_path_relative="10000views_and_higher\Li2zY7XcOf0_Matthew_Hussey_flip_h_BW_with_logo.mp4"
output_path_relative="10000views_and_higher\Li2zY7XcOf0_Matthew_Hussey_flip_h_BW_with_logo_EN.mp4"
add_subtitles_with_ass(video_path_relative, ass_path_relative, output_path_relative)
print(50*"*")
print(50*"*")
print(50*"*")

print(f"Test 2  with relative path -----------------------------------------------------------------------")
ass_path2_relative="10000views_and_higher\\Li2zY7XcOf0_Matthew_Hussey_flip_h_BW_with_logo_EN.ass"
video_path2_relative="10000views_and_higher\\Li2zY7XcOf0_Matthew_Hussey_flip_h_BW_with_logo.mp4"
output_path2_relative="10000views_and_higher\\Li2zY7XcOf0_Matthew_Hussey_flip_h_BW_with_logo_EN.mp4"
add_subtitles_with_ass(video_path2_relative, ass_path2_relative, output_path2_relative)

print(50*"*")
print(50*"*")
print(50*"*")

print(f"Test 3  with relative path -----------------------------------------------------------------------")
ass_path3_relative="10000views_and_higher/\Li2zY7XcOf0_Matthew_Hussey_flip_h_BW_with_logo_EN.ass"
video_path3_relative="10000views_and_higher/\Li2zY7XcOf0_Matthew_Hussey_flip_h_BW_with_logo.mp4"
output_path3_relative="10000views_and_higher/\Li2zY7XcOf0_Matthew_Hussey_flip_h_BW_with_logo_EN.mp4"
add_subtitles_with_ass(video_path3_relative, ass_path3_relative, output_path3_relative)

print(50*"*")
print(50*"*")
print(50*"*")

print(f"Test 4  with relative path -----------------------------------------------------------------------")
ass_path4_relative="10000views_and_higher/\\Li2zY7XcOf0_Matthew_Hussey_flip_h_BW_with_logo_EN.ass"
video_path4_relative="10000views_and_higher/\\Li2zY7XcOf0_Matthew_Hussey_flip_h_BW_with_logo.mp4"
output_path4_relative="10000views_and_higher/\\Li2zY7XcOf0_Matthew_Hussey_flip_h_BW_with_logo_EN.mp4"
add_subtitles_with_ass(video_path4_relative, ass_path4_relative, output_path4_relative)




print(f"Test 1 with subprocess  with relative path -----------------------------------------------------------------------")
add_subtitles_with_ass_with_subprocess(video_path, ass_path, output_path)
print(50*"*")
print(50*"*")
print(50*"*")

print(f"Test 2 with subprocess  with relative path -----------------------------------------------------------------------")
add_subtitles_with_ass_with_subprocess(video_path2_relative, ass_path2_relative, output_path2_relative)
print(50*"*")
print(50*"*")
print(50*"*")

print(f"Test 3 with subprocess  with relative path -----------------------------------------------------------------------")
add_subtitles_with_ass_with_subprocess(video_path3_relative, ass_path3_relative, output_path3_relative)
print(50*"*")
print(50*"*")
print(50*"*")

print(f"Test 4 with subprocess  with relative path -----------------------------------------------------------------------")
add_subtitles_with_ass_with_subprocess(video_path4_relative, ass_path4_relative, output_path4_relative)
print(50*"*")
print(50*"*")
print(50*"*")


  


  THE OUTPUT :

  


  The output was too large to post it here. I uploaded it on my github :

  


  https://github.com/gauthierbuttez/public/blob/master/output_ffmpeg.log

  


  I also zipped and uploaded all the files to make reproducing the issue on your computer easy :

  


  https://github.com/gauthierbuttez/public/blob/master/test.zip

  


  Is there any kind super Python Master in the place ?

  


• doc/filters : fix "ewa_lanczos" filter description

  20 avril, par Niklas Haas

  doc/filters : fix "ewa_lanczos" filter description
  

  • [DH] doc/filters.texi

• FFmpeg : Invalid NAL unit size after Concat filter

  12 juin 2019, par green_hat

  I am trying to concatenate 3 videos using Concat filter.
  The videos are :

  Video1

  Duration : 00:00:05.34, start : 0.000000, bitrate : 45584 kb/s
  Stream #0:0(eng) : Video : h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 45653 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)

  Video2

  Duration : 01:12:18.67, start : 0.000000, bitrate : 730 kb/s
  Stream #0:0(und) : Video : h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p(tv, smpte170m/smpte170m/bt709), 704x352 [SAR 457:704 DAR 457:352], 599 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc (default)

  Video3

  Duration : 00:00:10.02, start : 0.000000, bitrate : 25827 kb/s
  Stream #0:0(und) : Video : h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 25812 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)

  The ffmpeg command that I use is :

  ffmpeg -i video1.mp4 -i video2.mp4 -i video3.mp4 -filter_complex 
  
  "[0:v]scale=1920:1080:force_original_aspect_ratio=1,pad=1920:1080:(ow-iw)/2:(oh-ih)/2,setdar=16/9[v0];
  
  [1:v]scale=1920:1080:force_original_aspect_ratio=1,pad=1920:1080:(ow-iw)/2:(oh-ih)/2,setdar=16/9[v1]; 
  
  [2:v]scale=1920:1080:force_original_aspect_ratio=1,pad=1920:1080:(ow-iw)/2:(oh-ih)/2,setdar=16/9[v2];
  
  [v0][0:a][v1][1:a][v2][2:a] concat=n=3:v=1:a=1[v][a]" 
  
  -map "[v]" -map "[a]" output.mp4
  
  (I have tried also with force_original_aspect_ratio=decrease)

  However I get the following error

  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b7422ea700] stream 1, offset 0xbac62: partial files dup=2 drop=0 speed=0.989x
  
  [h264 @ 0x55b742be9a20] Invalid NAL unit size (110724 > 17746).
  
  [h264 @ 0x55b742be9a20] Error splitting the input into NAL units.
  
  video3.mp4: Invalid data found when processing input
  
  video3.mp4: Invalid data found when processing input
  
  Last message repeated 2 times
  
  Error while decoding stream #2:0: Invalid data found when processing input
  
  video3.mp4: Invalid data found when processing input
  
  Last message repeated 1 times

  and the output.mp4 is only video1+video2.

  BUT ! If I use a sample of video2.mp4 (for example the first 10 minutes of it), the ffmpeg command runs successfully till the end, generating the expected output (video1+video2+video3).

  Do you know why do I get this error and how could I cope with it ?

  UPDATE :
  My command works perfectly with a downgraded version of FFmpeg. Maybe there is a bug in the newest one ?