It seems some MediaCodecs cannot handle an EOS buffer as the first buffer. So in CodecWrapperImpl, we have a DCHECK on this [1]:

    // Some MediaCodecs consider it an error to get an EOS as the first buffer
    // ( http://crbug.com/672268 ).
    DCHECK_NE(state_, State::kFlushed);

However, it's actually possible that after config change, which triggers the flush logic, the first buffer read from the demuxer is an EOS buffer. In that case we'll actually hit this DCHECK.

For the record, this has been discussed in
https://chromium-review.googlesource.com/c/chromium/src/+/1056490/5/media/gpu/android/codec_wrapper.cc#223

[1] https://cs.chromium.org/chromium/src/media/gpu/android/codec_wrapper.cc?rcl=de67106ba27287f1b29a8094aabe4d275ca3beb6&l=221