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AviSynth - hasaudio problem - VideoHelp Forum
https://forum.videohelp.com/threads/388223-AviSynth-hasaudio-problem
AviSynth+ r2580 Various MP4 H264 input videos - some have audio track (usually aac), some don't. I need to detect which videos do not have audio, so I can generate audio track using BlankClip. I do not have any demuxers/splitters/decoders installed (like Halli or similar). Tried the following source filters - test using a video with no audio track:
Importing media - Avisynth wiki
http://avisynth.nl/index.php/Importing_media
Load MP4 (video: h.264, audio: aac) using DirectShowSource and ffdshow (aac decoding enabled in ffdshow; when the audio is AC3 or DTS you can also use AC3Filter instead). Your script becomes for example: DirectShowSource ("d:\x264_aac.mp4", fps=25, convertfps=true) # adjust fps if necessary. some other formats:
FAQ loading clips - Avisynth wiki
http://avisynth.nl/index.php/FAQ_loading_clips
If your media file contains MPEG-4 AVC video, then there are two possibilities of opening them in AviSynth: 1) Using the plugin FFmpegSource. See above for its usage. At the moment, the supported containers are: AVI, MKV and MP4. 2) Get DGAVCDecode. At the moment you need to extract the raw stream (*.264) from the container first (using MKVExtract, MPlayer, TSRemux …
How to bring MP4 files into an AviSynth script « 720p ...
https://compactvideo.wordpress.com/2012/02/01/how-to-bring-mp4-files-into-an-avisynth-script/
Your compact camera may give you the option to shoot 720p video as MP4. If the video compression is x264 and the audio is AAC then your source files can be brought into an AviSynth script in a very similar fashion to AVCHD Lite.
MKV to MP4/using AviSynth/Problem with H264 - AnimeSuki Forum
https://forums.animesuki.com/showthread.php?t=60665
So for some time i've been looking into a guide to convert a MKV to MP4 (with subtitles), I found one on animesuki and thought I finally had it. However I ran into a problem. First I use MKVExtract and extract all of the audio/video/subtitles from the video I want to convert. Then I create a small script for AviSynth that looks like this as ...
DirectShowSource - Avisynth wiki
http://avisynth.nl/index.php/DirectShowSource
Unfortunately there is no way for AviSynth to correct this once the file has been opened. Use AssumeSampleRate and set the correct sample rate to fix this problem. My sound is choppy . Unfortunately Directshow is not required to support sample exact seeking. Open the sound another way, or demux your video file and serve it to AviSynth another way.
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