Problem with B-frames

[johnr283]

I have a WMV file I'm trying to edit and convert to MP4 using Avidemux. When opening the file, I get:
This video contains B-frames, but the presentation time stamps (PTS) are either missing or monotonically increasing. Avidemux can try to reconstruct correct PTS by decoding the entire video. This may take a lot of time. Proceed?

When I try to convert it, Avidemux crashes and closes.

[davexnet]

Try deselecting the audio (from "audio" at the top) and just encoding the video.
If this works you can save the audio to uncompressed WAV by opening the source in Audacity (with the FFmpeg supplement installed
so it can access the file), then expoting it to a WAV file. Then use this as audio input to Avidemux after deselecting the original stream audio

Another method is to create a new lossless intermediate, then open that in Avidemux, do your editing, then save to
the format of your choice.

You can use a simple FFmpeg command to create the new source. It wil be big, as it's lossless

ffmpeg.exe -i in.wmv -c:v libx264 -crf 0 -c:a pcm_s16le out.mkv

[johnr283]

Try deselecting the audio (from "audio" at the top) and just encoding the video.
If this works you can save the audio to uncompressed WAV by opening the source in Audacity (with the FFmpeg supplement installed
so it can access the file), then expoting it to a WAV file. Then use this as audio input to Avidemux after deselecting the original stream audio

Another method is to create a new lossless intermediate, then open that in Avidemux, do your editing, then save to
the format of your choice.

This worked although the audio sounds a little different, almost like there's an eco to it.

[davexnet]

Try deselecting the audio (from "audio" at the top) and just encoding the video.
If this works you can save the audio to uncompressed WAV by opening the source in Audacity (with the FFmpeg supplement installed
so it can access the file), then expoting it to a WAV file. Then use this as audio input to Avidemux after deselecting the original stream audio

Another method is to create a new lossless intermediate, then open that in Avidemux, do your editing, then save to
the format of your choice.

This worked although the audio sounds a little different, almost like there's an eco to it.

Which method did you use?
For further analysis provide a clip of the source, upload to a hosting site and
Put the URL here, or you can upload here directly, up to 500mb

[johns0]

If your audio source was 5.1 then it might be 2.0 with the wrong encoding missing the main audio tracks.

[johnr283]

Never mind. I don't know what went wrong the first time, but it's fine now. I used the first method you recommended. Thanks!

[davexnet]

Never mind. I don't know what went wrong the first time, but it's fine now. I used the first method you recommended. Thanks!

Thanks for the update