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• Can't import to Unity video clip rendered using FFmpeg for Unity

  29 juin 2023, par Maximiliano Bezmalinovic

  I am using FFmpeg to render a video in Unity. For the FFmpegCaptureCommand.OutputOptions I'm using this command :

  


  -g 24 -c:v h264 -preset medium -crf 32 -pix_fmt yuv420p -color_primaries bt709 -color_trc bt709 -colorspace bt709 -color_range pc -f mov -movflags frag_keyframe+empty_moov -vf setpts=2*PTS


  


  The video output plays fine on windows media player or VLC but when I try to import the clip into Unity I get the following error :

  


  WindowsVideoMedia error 0xc00d36e6 while reading C:/.../d.mov

Context: Getting duration.
Error details: The requested attribute was not found.
Track types:
   Video Track [1024 x 1024], type: H264


  


  I can create a working copy of the video with this command :

  


  ffmpeg -i input.mov output.mov


  


  I assume ffmpeg creates a new container for the video when it copies it but I can't figure out why is not doing it in the first place.

  


  Using ffprobe

  


  ffprobe -show_streams -select_streams v C:\...\d.mov   


  


  I get this info on the original video :

  


  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'C:\...\d.mov':
  Metadata:
    major_brand     : qt
    minor_version   : 512
    compatible_brands: qt
    encoder         : Lavf59.4.101
  Duration: 00:00:02.97, start: 0.066667, bitrate: 2471 kb/s
  Stream #0:0: Video: h264 (High) (avc1 / 0x31637661), yuvj420p(pc, bt709), 1024x1024, 2465 kb/s, 30 fps, 30 tbr, 15360 tbn (default)
    Metadata:
      handler_name    : VideoHandler
      vendor_id       : FFMP
      encoder         : Lavc59.4.100 libx264
[STREAM]
index=0
codec_name=h264
codec_long_name=H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10
profile=High
codec_type=video
codec_tag_string=avc1
codec_tag=0x31637661
width=1024
height=1024
coded_width=1024
coded_height=1024
closed_captions=0
has_b_frames=2
sample_aspect_ratio=N/A
display_aspect_ratio=N/A
pix_fmt=yuvj420p
level=32
color_range=pc
color_space=bt709
color_transfer=bt709
color_primaries=bt709
chroma_location=left
field_order=unknown
refs=1
is_avc=true
nal_length_size=4
id=N/A
r_frame_rate=30/1
avg_frame_rate=30/1
time_base=1/15360
start_pts=1024
start_time=0.066667
duration_ts=45568
duration=2.966667
bit_rate=2465649
max_bit_rate=N/A
bits_per_raw_sample=8
nb_frames=N/A
nb_read_frames=N/A
nb_read_packets=N/A
DISPOSITION:default=1
DISPOSITION:dub=0
DISPOSITION:original=0
DISPOSITION:comment=0
DISPOSITION:lyrics=0
DISPOSITION:karaoke=0
DISPOSITION:forced=0
DISPOSITION:hearing_impaired=0
DISPOSITION:visual_impaired=0
DISPOSITION:clean_effects=0
DISPOSITION:attached_pic=0
DISPOSITION:timed_thumbnails=0
DISPOSITION:captions=0
DISPOSITION:descriptions=0
DISPOSITION:metadata=0
DISPOSITION:dependent=0
DISPOSITION:still_image=0
TAG:handler_name=VideoHandler
TAG:vendor_id=FFMP
TAG:encoder=Lavc59.4.100 libx264
[/STREAM]


  


  and this on the copied video :

  


  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'C:\...\d1.mov':
  Metadata:
    major_brand     : qt
    minor_version   : 512
    compatible_brands: qt
    encoder         : Lavf59.4.101
  Duration: 00:00:02.97, start: 0.000000, bitrate: 2869 kb/s
  Stream #0:0: Video: h264 (High) (avc1 / 0x31637661), yuvj420p(pc, bt709), 1024x1024, 2865 kb/s, 30 fps, 30 tbr, 15360 tbn (default)
    Metadata:
      handler_name    : VideoHandler
      vendor_id       : FFMP
      encoder         : Lavc59.4.100 libx264
[STREAM]
index=0
codec_name=h264
codec_long_name=H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10
profile=High
codec_type=video
codec_tag_string=avc1
codec_tag=0x31637661
width=1024
height=1024
coded_width=1024
coded_height=1024
closed_captions=0
has_b_frames=2
sample_aspect_ratio=N/A
display_aspect_ratio=N/A
pix_fmt=yuvj420p
level=32
color_range=pc
color_space=bt709
color_transfer=bt709
color_primaries=bt709
chroma_location=left
field_order=unknown
refs=1
is_avc=true
nal_length_size=4
id=N/A
r_frame_rate=30/1
avg_frame_rate=30/1
time_base=1/15360
start_pts=0
start_time=0.000000
duration_ts=45568
duration=2.966667
bit_rate=2865152
max_bit_rate=N/A
bits_per_raw_sample=8
nb_frames=89
nb_read_frames=N/A
nb_read_packets=N/A
DISPOSITION:default=1
DISPOSITION:dub=0
DISPOSITION:original=0
DISPOSITION:comment=0
DISPOSITION:lyrics=0
DISPOSITION:karaoke=0
DISPOSITION:forced=0
DISPOSITION:hearing_impaired=0
DISPOSITION:visual_impaired=0
DISPOSITION:clean_effects=0
DISPOSITION:attached_pic=0
DISPOSITION:timed_thumbnails=0
DISPOSITION:captions=0
DISPOSITION:descriptions=0
DISPOSITION:metadata=0
DISPOSITION:dependent=0
DISPOSITION:still_image=0
TAG:handler_name=VideoHandler
TAG:vendor_id=FFMP
TAG:encoder=Lavc59.4.100 libx264
[/STREAM]


  


  I noticed the start_time is 0.000000 on the copied video but the original is 0.066667, I wonder if that has anything to do with it.

  


  If I look at the video properties/details the "Length" attribute is missing on the original video but exists in the copy. Does Unity need that info maybe ?

  


  What am I missing here ? How could I make my original command output a video with the proper data that Unity needs for importing it ?.

  


  Thanks in advance.

  


• avformat/oggparsetheora : clip duration within 64bit

  1er mai 2023, par Michael Niedermayer

  avformat/oggparsetheora : clip duration within 64bit
  Fixes : signed integer overflow : 9079256848778919936 - -288230376151711746 cannot be represented in type 'long'
  
  Fixes : 58248/clusterfuzz-testcase-minimized-ffmpeg_dem_OGG_fuzzer-6326851353313280
  Found-by : continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavformat/oggparsetheora.c

• Combine two videos in python and get frame-precision duration of the end of the first clip within the new combined clip

  30 mai 2023, par johnklawlor

  I am trying to combine two videos (mov files) in Python and get the frame-precision duration of the end of the first clip within the new, combined clip so that I can skip to the end of the first clip/start of the second clip within the newly combined clip.

  


  Here is how I combine the two videos.

  


  def concatenate_videos(video1_path, video2_path, output_path):
    input1 = ffmpeg.input(video1_path)
    input2 = ffmpeg.input(video2_path)

    vid = '/Users/johnlawlor/projects/yesand/backend/media/videos/vid.mp4'
    aud = '/Users/johnlawlor/projects/yesand/backend/media/videos/aud.mp3'
    ffmpeg.concat(input1, input2, n=2, v=1, a=0).output(vid).run()
    ffmpeg.concat(input1, input2, n=2, v=0, a=1).output(aud).run()

    input1 = ffmpeg.input(vid)
    input2 = ffmpeg.input(aud)
    ffmpeg.concat(input1, input2, n=2, v=1, a=1).output(output_path).run()


  


  Then I get the duration of the first clip.

  


  def _get_duration(local_file_path):
    new_addition_metadata = ffmpeg.probe(local_file_path)
    duration = float(new_addition_metadata['streams'][0]['duration'])
    return duration


  


  However, when I skip to the time that is returned by this logic, it skips to a few frames before the actual start of the second clip, so I get a jerky effect that seems like a bug.

  


  I am currently using ffmpeg-python. I am open to any other Python libraries.

  


  Any ideas ?

  


  Thanks !