Try with following sequence:
1.Vdec_deleteChn
2. Vdis_setChPlayerStatePlay - Change the seqId for the channel you deleted.
3. Vdis_flushSwMs - Set channel Id to channel you deleted and set holdLastFrame = FALSE
4. Vdec_createChn.
Note that when you change seqId the VCODEC_BITSBUF_S.seqId for each bit buffer sent by the application should match the seqId set in the API in step (2) else playback will not resume