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Alex Rivera
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I am trying to add text subtitles to an MP4 container using FFmpeg: ffmpeg -i input.mp4 -i input.srt -map 0.0 -map 0.1 -map 1.0 output.mp4 When I am trying to run this line, it gives me an error: Number of stream maps must match number of output streams. If I try to change the MP4 file to Matroska —filename extension .mkv — (although MP4 supports text subtitles), it is like this: ffmpeg -i input.mp4 -i input.srt -map 0.0 -map 0.1 -map 1.0 output.mkv It correctly maps the streams, but it gives an error: Encoder (codec id 94210) not found for output stream #0.2 When I launch ffmpeg -codecs I can see that the SRT codec is supported as decoder and encoder. However, I am not sure what is used for MP4 and Matroska subs encoding, and whether I need to switch it on or compile separately.
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