[FFmpeg-user] Yes or No? About the processing pipeline.

[Mark Filipak]

On 18/06/2025 16.41, Carl Zwanzig wrote:
> On 6/18/2025 4:42 AM, Mark Filipak wrote:
>> It fails with a nonsense error message.
> 
> If you're referring to-
> [sost#0:2 @ 0000000004c5ec80] Automatic encoder selection failed Default encoder for format mp4 
> (codec none) is probably disabled. Please choose an encoder manually.
> [sost#0:2 @ 0000000004c5ec80] Error selecting an encoder
> 
> That is definitely not "nonsense" because you don't immediately understand it; seems pretty obvious 
> to me and I'm sure you use ffmpeg a lot more than I do.
> 
> 
> The #0:2 refers to a stream, for which it can't select a codec. A couple of lines above we see
> 
>    Stream #0:2: Subtitle: dvd_subtitle (dvdsub), 720x480
> 
> which tells us about that stream.
> 
> So ffmpeg can't automatically select a codec for dvdsub into an MP4. -Why- it can't is another 
> question but not one that would be answered by a fairly generic error message.
> 
> This is not rocket science.

FFmpeg has made it rocket science. I address this issue in this posting:
  A fix for "Automatic encoder selection failed".

Z, how am I or anyone to know what "sost#0:2" means? I don't even know what "sost" means.

--Mark.