Fixing FFmpeg: No Audio when Converting DVD VOB to MP4

Fixing FFmpeg: No Audio Converting DVD VOB to MP4

When trying to convert DVD VOB files to MP4 using FFmpeg through the command provided in the Winx DVD Ripper website, you might encounter an issue where the audio is not being converted or is out of sync. This article will guide you on how to fix this problem by providing detailed explanations and solutions for the topic.

Understanding the Problem

When converting DVD VOB files to MP4 using FFmpeg, the following command is used as per the Winx DVD Ripper website:

The problem occurs due to the lack of audio codec mapping in the FFmpeg command, leading to missing or out-of-sync audio in the output MP4 file.

Solution:

To fix the FFmpeg audio conversion issue, you need to provide FFmpeg with information about the audio codecs you want to use when converting DVD VOB files to MP4. This can be done by adding the appropriate codecs to the FFmpeg command using the -c:a option.

A recommended set of audio and video codecs are: - Video: h264 (codec for MP4 video) - Audio: ac3 (codec for DVD audio) or aac (codec for MP4 audio)

Here's an example of the updated FFmpeg command that includes the specified audio and video codecs:

If you prefer using the aac codec for audio, replace ac3 with aac in the command:

Additional Tips:

• Ensure that FFmpeg has access to the required codecs by installing and configuring the appropriate codecs and libraries.
• If you're still experiencing audio sync issues, try setting the -async option to 1 in the FFmpeg command:
  ffmpeg -i "concat:VTS_01_1.VOB|VTS_01_2.VOB|..." -c:v h264 -c:a ac3 -async 1 output.mp4

Summary:

This article provided a solution to the FFmpeg audio conversion issue when converting DVD VOB files to MP4. By adding the appropriate audio codec (ac3 or aac), the correct FFmpeg command can be successfully implemented, leading to the desired MP4 output with proper audio.

References:

• FFmpeg Official Site
• Encode AAC - FFmpeg Wiki
• Advanced Audio Coding