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27th February 2026, 21:13
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#1961 | Link |
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Location: Germany
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Using external encoder
I was about to use an external encoder (for the first time) of ffmpeg.
What I need is to encode the video, leave the audio as-is and put it into an mkv container. But doing File/Export/UsingExternalEncoder I always get: Invalid command line template: "-i - -c:v libsvtav1 -preset 5 -crf 22 -pix_fmt yuv420p10le -c:a copy "%file%"" What I did before: Options/ExternalEncoders... Have to define at the Encoders tab first. My entries: Video Encoder C:\<FullPathToFFMPEG>\ffmpeg.exe -i - -c:v libsvtav1 -preset 5 -crf 22 -pix_fmt yuv420p10le -c:a copy "%file%" %(outputname).video I do not define an audio encoder in the other tab. Next go to Encoder Sets and define a set with only the former video encoder entered. That's it. What did I do wrong? |
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28th February 2026, 15:04
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#1962 | Link | |
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Join Date: Dec 2008
Posts: 2,406
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Quote:
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MPC-BE 1.8.9 and Nightly builds | VideoRenderer | ImageSource | ScriptSource | BassAudioSource |
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28th February 2026, 16:03
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#1963 | Link | |
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Location: Germany
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Quote:
Then additionally defined an audio encoder: Command as of video encoder, options as: -i - -c:a copy "%file%" Input format: Raw audio data (or WAV file, doesn't matter). Compression: Bypass... Next added the defined audio encoder to the encoder set. (Still no multiplexer defined). Then do the Export/ ExternalEncoder. Message: Invalid command line template: -i - -c:a copy "%file%" What might be obviously wrong now? Last edited by nji; 28th February 2026 at 16:31. |
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28th February 2026, 20:31
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#1964 | Link |
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Location: Germany
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Very strange... there seems to be no knowledge in the forum how to use external encoders
 However I just discovered that your app can't read vdscript files (saved by itself), whereas orig VD2 has no problem with. |
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1st March 2026, 11:23
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#1965 | Link | |
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Quote:
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MPC-BE 1.8.9 and Nightly builds | VideoRenderer | ImageSource | ScriptSource | BassAudioSource |
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1st March 2026, 16:15
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#1966 | Link | |
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Location: Germany
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I already saw that source, but as it is as old (for VD1.10!), I wouldn't have expected that these entries do still work for VD2.x.
OK, with them I tried a simplified example: source: h264+aac movie. wanted destination: x265 lossless + audio copy. ffmpeg CLI: ffmpeg -i SourceAVC1.mp4 -c:v libx265 -crf 0 -c:a copy s.mkv does fine. Now define as external encoder in VD2.5: Video encoder arguments: -f rawvideo -c:v libx265 -crf 0 -i - "%(tempvideofile)" Audio encoder arguments: -i - -c:a copy "%(tempaudiofile)". Other tab: WAV file and bypass compression. Addition simple muxing by ffmpeg of both defined. Start stops at once. Log: Quote:
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1st March 2026, 19:06
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#1967 | Link | |
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Join Date: Dec 2008
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Quote:
If the task is to encode only video, then a simple example is as follows: Code:
Video encoder ffmpeg.exe -f rawvideo -s %(width)x%(height) -r %(fps) -i - -c:v libx264 -y %(outputname) %(outputname) This could be found in the link I wrote above. Sample1, Sample2.
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MPC-BE 1.8.9 and Nightly builds | VideoRenderer | ImageSource | ScriptSource | BassAudioSource |
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1st March 2026, 21:30
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#1968 | Link |
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Join Date: Mar 2018
Location: Germany
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Thank you for your assistance
 Acutually parameters width and height seem to be mandatory. I didn't expect that. I thought that VD2 just "calls" the encoder (same as in CLI). Audio encoder, bypass compression: It seems I misunderstood that. I thought when defining an external encoder, it would be possible to somehow leave the audio as-is (like the CLI ffmpeg command: -c:a copy). But if I'm right, then that isn't possible at all? By defining an external decoder, VD2 forwards the (de-compressed, if compr. bypassed) raw audio to audio encoder, so you have to compress with the audio encoder again. Right? Or do I miss something? Is it possible to pass-through the compressed audio stream from source untouched to the muxer?
Last edited by nji; 1st March 2026 at 22:53. |
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2nd March 2026, 08:51
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#1969 | Link | |
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Quote:
Some other input drivers may output the audio track as is. But I don't know if this works with external encoders.
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MPC-BE 1.8.9 and Nightly builds | VideoRenderer | ImageSource | ScriptSource | BassAudioSource |
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2nd March 2026, 09:20
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#1970 | Link |
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Join Date: Mar 2018
Location: Germany
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Actually I use a Quicktime driver for Audio (per "Audio from other file..."),
if I don't change video timeline, and so audio can remain, and doesn't have to be decompressed and recompressed again. Works perfect within VD2. But I haven't been successful in passing that compressed stream to an external encoder. And I haven't found any example/ explanation on that. I wonder, as it seems a usual case. Did anybody manage that? Last edited by nji; 2nd March 2026 at 09:23. |
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2nd March 2026, 09:52
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#1971 | Link | ||
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Join Date: Mar 2018
Location: Germany
Posts: 295
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In my example:
Say I have an aac audio file (e.g. the as-is extracted audio track (aac) from my video file; take AviDemux for extraction). In VD2's external decoder thing: how do I get that to "%(tempaudiofile)"? Using ffmpeg CLI the command is: ffmpeg -i SourceAVC1.aac -c:a copy bitcopy.aac So the definition for VD2 Audio Encoder should be like: ffmpeg -i - -c:a copy "%(tempaudiofile)" Right? When starting the external decoder set, it interupts after few seconds. Log: Quote:
Quote:
Last edited by nji; 2nd March 2026 at 10:02. |
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