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The AVC1 (MPEG-4_AVC_BP) file format is also known as MPEG-4, which have H.264 in the baseline profile. Learn more about avc1
The SPX file format is a compressed audio format designed for speech. It is Open Source thus can be used for free. It compresses voices at 2 to 44 kbps and supports 8 kHz, 16 kHz, and 32 kHz compression in the same bitstream. Learn more about spx