//todo check for params mismatch
let cvt = match (&oopts.enc_params.format, &ret_eparams.format) {
(NACodecTypeInfo::Video(svinfo), NACodecTypeInfo::Video(dvinfo)) => {
//todo check for params mismatch
let cvt = match (&oopts.enc_params.format, &ret_eparams.format) {
(NACodecTypeInfo::Video(svinfo), NACodecTypeInfo::Video(dvinfo)) => {