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• Converting From 4-bit RAW Audio to WAV (or another output format)

  10 février 2017, par Haravikk

  Okay, so I’ve got some .raw files from an old game (Zork Nemesis) and determined that they’re audio files, however I’m having trouble converting them into something meaningful.

  With a bit of trial and error in Audacity I’ve found that I can listen to a still noisy version of the audio using raw file input settings of 8-bit signed PCM in stereo with a sample rate of 22050hz. However, my suspicion is that the files may in fact be encoded in 4-bits with a sample rate of 44100hz, but I’m having trouble finding a tool that can handle this.

  What I’m looking for is either a tool that can handle 4-bit raw formats, or even a tool that can determine (or guess at) the format of a given .raw file, so I know for sure what I’m dealing with (as I’m just going by trial and error so far).

  I’ve tried sox, but I’m most likely doing something wrong as it complains of an unsupported size :

  sox -r 44100 -e signed -b 4 -c 2 in.raw out.wav

  I was also going to try ffmpeg, but I can’t find the appropriate format/codec to set.

  In case it gives any further clues ; I’ve tried various combinations of settings, increasing sample size while decreasing sample rate increases the (white-)noise, and even 8-bit is still noisy, which is why I’m thinking 4-bit. I’ve tried signed and unsigned, which strangely doesn’t seem to make much of a difference

• appx cannot call exe file

  22 avril 2022, par MrL

  enter image description here

  


  I have developed an application with electron and intend to upload it to the windows app store. This software needs ffmpeg Exe, which can be used normally during the test, but I can't call ffmpeg after I package it into appx and install it Exe, I guess Microsoft may not allow developers to call exe files, but I'm not particularly sure. Is there any other way to call ffmpeg ?

  


• Cannot play DAV to MP4 converted H.265 video file with hvc1 tag in iPhone

  21 août 2023, par Venkata Subbarao

  I have converted H.265 video file in dav format from Dahua camera using following commands. Both of the generated mp4 video files are NOT playable in iPhone default player. However, the generated video files are playable in VLC player.

  


  ffmpeg -y -i hevc.dav -c:v copy -tag:v hvc1 hevc.mp4
ffmpeg -y -i hevc.dav -tag:v hvc1 -c:v copy -f mp4 -movflags frag_keyframe+empty_moov hevc.mp4


  


  Generated video file plays only if I re-encode the video using following command.

  


  ffmpeg -y -i hevc.dav -c:v libx265 -tag:v hvc1 hevc.mp4


  


  Re-encoding is time consuming. So, please let me know, if I am missing any flags in the above commands.