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• lavc/cbs_av1 : restore CodedBitstreamAV1Context when AVERROR(ENOSPC)

  28 septembre 2022, par Haihao Xiang

  lavc/cbs_av1 : restore CodedBitstreamAV1Context when AVERROR(ENOSPC)
  The current pbc might be small for an obu frame, so a new pbc is
  
  required then parse this obu frame again. Because
  
  CodedBitstreamAV1Context has already been updated for this obu frame, we
  
  need to restore CodedBitstreamAV1Context, otherwise
  
  CodedBitstreamAV1Context doesn't match this obu frame when parsing obu
  
  frame again, e.g. CodedBitstreamAV1Context.order_hint.
  $ ffmpeg -i input.ivf -c:v copy -f null -
  
  [...]
  
  [av1_frame_merge @ 0x558bc3d6f880] ref_order_hint[i] does not match
  
  inferred value : 20, but should be 22.
  
  [av1_frame_merge @ 0x558bc3d6f880] Failed to write unit 1 (type 6).
  
  [av1_frame_merge @ 0x558bc3d6f880] Failed to write packet.
  
  [obu @ 0x558bc3d6e040] av1_frame_merge filter failed to send output
  
  packet
  Reviewed-by : James Almer <jamrial@gmail.com>
  
  Reviewed-by : Wenbin Chen <wenbin.chen@intel.com>
  
  Signed-off-by : Haihao Xiang <haihao.xiang@intel.com>
  

  • [DH] libavcodec/cbs_av1.c

• How to merge two audio files while retaining correct timings with ffmpeg

  31 août 2017, par andy

  Disclaimer : I don’t understand ffmpeg and mostly just copy commands

  I have two webm video files. Their duration is off by about a second.

  I converted these to mp4 and everything was fine :

  ffmpeg -acodec libopus -i 1.webm -r 10 -cpu-used 5 -c:v libx264 -crf 20 -c:a aac -strict experimental -loglevel error 1.mp4

  I then extracted the audio from each video and everything was fine. By fine, I mean, when I playback the audio files by themselves they match the timings on the original video. I used this command to extract the audio :

  fmpeg -i 1.mp4 -map 0:a -vn -acodec copy 1audio.m4a

  I now have two audio tracks and I want to combine them into one, I want to "overlay" them, AND I want to keep the timings the same as they were.

  BUT, whenever I try and combine the audio the timings are off. The "seconds" don’t match the original single audio files.

  I have tried these commands to merge the audio :

  ffmpeg -i 1audio.m4a -i 2audio.m4a -filter_complex "[0:a][1:a]amerge=inputs=2[a]" -map [a] -c:a libfdk_aac mergedaudio.m4a

  ffmpeg -i 2audio.m4a -i 1audio.m4a -filter_complex amix=inputs=2:duration=first mergedaudio.m4a

  ffmpeg -i 1audio.m4a -i 2audio.m4a -filter_complex amerge -ac 2 -c:a libfdk_aac -vbr 4 mergedaudio.m4a

  All the above command have resulted in a merged audio file... but the timings are off.

  What am I doing wrong ?

• audio issues when merging a video with an audio file using python ffmpeg and moviepy

  29 février 2024, par Stevenb123

  I’m trying to create a code that syncs between an audio file and a background file in terms of duration.
When creating the merged video I hear a cut or a loop sound of the last sentence for like 0.2 seconds.
I have tried to solve it in many different ways, listed below.

  


  Has anyone solved this issue ? I saw many people having a similar problem.
I’m using Ubuntu version 20.04 and ffmpeg version 4.2.7

  


  This is my code :

  


  def merge_videos_with_subs(
    background_path, audio_path, subs, output_directory, output_filename
):
    try:
        # Load background video and audio
        background_clip = VideoFileClip(background_path)
        background_clip = background_clip.without_audio()
        audio_clip = AudioFileClip(audio_path)

        # Adjust video duration to match audio duration
        audio_duration = audio_clip.duration

        # If the background video is longer, trim it to match the audio duration
        if background_clip.duration > audio_duration:
            background_clip = background_clip.subclip(0, audio_duration)
        # If the audio is longer, loop the background video
        else:
            background_clip = background_clip.loop(duration=audio_duration)

        # Set audio of the background clip
        background_clip = background_clip.set_audio(audio_clip)

        # Overlay subtitles on the video
        final_clip = CompositeVideoClip(
            [background_clip, subtitles.set_pos(("center", "bottom"))]
        )

        # Ensure the output directory exists
        os.makedirs(output_directory, exist_ok=True)

        # Define the output path
        output_path = os.path.join(output_directory, output_filename)

        # Write the merged video with subtitles
        final_clip.write_videofile(
            output_path, codec="libx264", audio_codec="aac", threads=4, fps=24
        )

        # Close the clips
        final_clip.close()
        background_clip.close()
        audio_clip.close()

        print(f"Merged video with subtitles saved to: {output_path}")
    except Exception as e:
        print(f"Error merging videos: {e}")


  


  I’ve tried changing the codec, tried cutting 0.2 seconds of the audio before and after the merge or silencing it, nothing seems to help.
  
When I run my code without the background subclip to match the audio it worked flawlessy.
If I let the background run until its full duration or make it loop there were no audio issues.
  
Looks like the issue is on the cutting part.