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authorbreadcat2020-06-19 12:23:15 +0100
committerbreadcat2020-06-19 12:23:15 +0100
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Simple migration of existing posts to hugo format
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+---
+title: "Manually fixing malformed AAC bitstreams"
+date: 2019-10-22T09:21:00
+tags: ["formats", "guides", "media", "snippets", "software", "windows"]
+---
+
+Recently while running `youtube-dl` on Windows, `ffmpeg` wasn't found in `%PATH%`, so it was unable to automatically fix the AAC bitstream. The file will play fine, but in the interest of completeness I still wanted this to be applied to my new files.
+
+Not wanting to alter my path variable for a one-off fix, I investigated the source code a little and found the `FFmpegFixupM3u8PP` [function here](https://github.com/ytdl-org/youtube-dl/blob/3089bc748c0fe72a0361bce3f5e2fbab25175236/youtube_dl/postprocessor/ffmpeg.py#L577).
+
+With that, you can now run:
+```
+ffmpeg -i "input_file.mp4" -c copy -f mp4 -bsf:a aac_adtstoasc "output_file.mp4"
+```
+
+And you're done. \ No newline at end of file