Hi,
the attached patch should fix this bug.
Note that the package now depends on libavresample.

-- 
Anton Khirnov
Index: cmus-2.5.0/ffmpeg.c
===================================================================
--- cmus-2.5.0.orig/ffmpeg.c	2012-11-07 08:46:17.000000000 +0000
+++ cmus-2.5.0/ffmpeg.c	2014-03-01 09:26:32.099123054 +0000
@@ -26,18 +26,12 @@
 #endif
 
 #include <stdio.h>
-#ifdef HAVE_FFMPEG_AVCODEC_H
-#include <ffmpeg/avcodec.h>
-#include <ffmpeg/avformat.h>
-#include <ffmpeg/avio.h>
-#else
 #include <libavcodec/avcodec.h>
 #include <libavformat/avformat.h>
 #include <libavformat/avio.h>
-#ifndef AVUTIL_MATHEMATICS_H
+#include <libavresample/avresample.h>
+#include <libavutil/opt.h>
 #include <libavutil/mathematics.h>
-#endif
-#endif
 
 #if (LIBAVFORMAT_VERSION_INT < ((52<<16)+(31<<8)+0))
 # define NUM_FFMPEG_KEYS 8
@@ -77,6 +71,7 @@
 	uint8_t *buffer_malloc;
 	uint8_t *buffer_pos;	/* current buffer position */
 	int buffer_used_len;
+	int buffer_size;
 };
 
 struct ffmpeg_private {
@@ -87,6 +82,13 @@
 
 	struct ffmpeg_input *input;
 	struct ffmpeg_output *output;
+
+	AVFrame *frame;
+
+	AVAudioResampleContext *avr;
+	uint64_t resample_channel_layout;
+	int	 resample_sample_rate;
+	int 	 resample_sample_fmt;
 };
 
 static struct ffmpeg_input *ffmpeg_input_create(void)
@@ -112,7 +114,8 @@
 {
 	struct ffmpeg_output *output = xnew(struct ffmpeg_output, 1);
 
-	output->buffer_malloc = xnew(uint8_t, AVCODEC_MAX_AUDIO_FRAME_SIZE + 15);
+	output->buffer_size = 192000 + 15;
+	output->buffer_malloc = xnew(uint8_t, output->buffer_size);
 	output->buffer = output->buffer_malloc;
 	/* align to 16 bytes so avcodec can SSE/Altivec/etc */
 	while ((intptr_t) output->buffer % 16)
@@ -241,20 +244,12 @@
 			break;
 		}
 
-#if (LIBAVCODEC_VERSION_INT > ((51<<16)+(64<<8)+0))
-		if (cc->sample_fmt == AV_SAMPLE_FMT_FLT || cc->sample_fmt == AV_SAMPLE_FMT_DBL) {
-#else
-		if (cc->sample_fmt == AV_SAMPLE_FMT_FLT) {
-#endif
-			err = -IP_ERROR_SAMPLE_FORMAT;
-			break;
-		}
 		/* We assume below that no more errors follow. */
 	} while (0);
 
 	if (err < 0) {
 		/* Clean up.  cc is never opened at this point.  (See above assumption.) */
-		av_close_input_file(ic);
+		avformat_close_input(&ic);
 		return err;
 	}
 
@@ -262,11 +257,12 @@
 	priv->codec_context = cc;
 	priv->input_context = ic;
 	priv->codec = codec;
+	priv->frame = av_frame_alloc();
 	priv->stream_index = stream_index;
 	priv->input = ffmpeg_input_create();
 	if (priv->input == NULL) {
 		avcodec_close(cc);
-		av_close_input_file(ic);
+		avformat_close_input(&ic);
 		free(priv);
 		return -IP_ERROR_INTERNAL;
 	}
@@ -300,8 +296,10 @@
 {
 	struct ffmpeg_private *priv = ip_data->private;
 
+	av_frame_free(&priv->frame);
+	avresample_free(&priv->avr);
 	avcodec_close(priv->codec_context);
-	av_close_input_file(priv->input_context);
+	avformat_close_input(&priv->input_context);
 	ffmpeg_input_free(priv->input);
 	ffmpeg_output_free(priv->output);
 	free(priv);
@@ -313,14 +311,18 @@
  * This returns the number of bytes added to the buffer.
  * It returns < 0 on error.  0 on EOF.
  */
-static int ffmpeg_fill_buffer(AVFormatContext *ic, AVCodecContext *cc, struct ffmpeg_input *input,
+static int ffmpeg_fill_buffer(struct ffmpeg_private *priv, struct ffmpeg_input *input,
 			      struct ffmpeg_output *output)
 {
+	AVFormatContext *ic = priv->input_context;
+	AVCodecContext  *cc = priv->codec_context;
+	AVFrame *frame      = priv->frame;
+
 	while (1) {
 		/* frame_size specifies the size of output->buffer for
 		 * avcodec_decode_audio2. */
-		int frame_size = AVCODEC_MAX_AUDIO_FRAME_SIZE;
-		int len;
+		AVPacket avpkt;
+		int len, got_output, ret;
 
 		if (input->curr_pkt_size <= 0) {
 			av_free_packet(&input->pkt);
@@ -335,26 +337,11 @@
 			continue;
 		}
 
-		/* The change to avcodec_decode_audio2 occurred between
-		 * 51.28.0 and 51.29.0 */
-#if (LIBAVCODEC_VERSION_INT <= ((51<<16) + (28<<8) + 0))
-		len = avcodec_decode_audio(cc, (int16_t *)output->buffer, &frame_size,
-				input->curr_pkt_buf, input->curr_pkt_size);
-		/* The change to avcodec_decode_audio3 occurred between
-		 * 52.25.0 and 52.26.0 */
-#elif (LIBAVCODEC_VERSION_INT <= ((52<<16) + (25<<8) + 0))
-		len = avcodec_decode_audio2(cc, (int16_t *) output->buffer, &frame_size,
-				input->curr_pkt_buf, input->curr_pkt_size);
-#else
-		{
-			AVPacket avpkt;
-			av_init_packet(&avpkt);
-			avpkt.data = input->curr_pkt_buf;
-			avpkt.size = input->curr_pkt_size;
-			len = avcodec_decode_audio3(cc, (int16_t *) output->buffer, &frame_size, &avpkt);
-			av_free_packet(&avpkt);
-		}
-#endif
+		av_init_packet(&avpkt);
+		avpkt.data = input->curr_pkt_buf;
+		avpkt.size = input->curr_pkt_size;
+		len = avcodec_decode_audio4(cc, frame, &got_output, &avpkt);
+
 		if (len < 0) {
 			/* this is often reached when seeking, not sure why */
 			input->curr_pkt_size = 0;
@@ -362,10 +349,34 @@
 		}
 		input->curr_pkt_size -= len;
 		input->curr_pkt_buf += len;
-		if (frame_size > 0) {
+		if (got_output) {
+			if (!priv->avr ||
+			    frame->format != priv->resample_sample_fmt ||
+                            frame->sample_rate != priv->resample_sample_rate ||
+                            frame->channel_layout != priv->resample_channel_layout) {
+
+                                avresample_free(&priv->avr);
+
+                                priv->avr = avresample_alloc_context();
+                                av_opt_set_int(priv->avr, "in_channel_layout", frame->channel_layout, 0);
+                                av_opt_set_int(priv->avr, "out_channel_layout", frame->channel_layout, 0);
+                                av_opt_set_int(priv->avr, "in_sample_rate", frame->sample_rate, 0);
+                                av_opt_set_int(priv->avr, "out_sample_rate", frame->sample_rate, 0);
+                                av_opt_set_int(priv->avr, "in_sample_fmt", frame->format, 0);
+                                av_opt_set_int(priv->avr, "out_sample_fmt", AV_SAMPLE_FMT_S16, 0);
+
+                                ret = avresample_open(priv->avr);
+                                if (ret < 0)
+                                        return -IP_ERROR_INTERNAL;
+                        }
+
+                        len = avresample_convert(priv->avr, (uint8_t**)&output->buffer, 
+					output->buffer_size, frame->nb_samples,
+					frame->extended_data, frame->linesize[0], frame->nb_samples);
+
 			output->buffer_pos = output->buffer;
-			output->buffer_used_len = frame_size;
-			return frame_size;
+			output->buffer_used_len = len * 2 * cc->channels;
+			return output->buffer_used_len;
 		}
 	}
 	/* This should never get here. */
@@ -380,7 +391,7 @@
 	int out_size;
 
 	if (output->buffer_used_len == 0) {
-		rc = ffmpeg_fill_buffer(priv->input_context, priv->codec_context, priv->input, priv->output);
+		rc = ffmpeg_fill_buffer(priv, priv->input, priv->output);
 		if (rc <= 0) {
 			return rc;
 		}
@@ -494,7 +505,7 @@
 	long bitrate = -1;
 #if (LIBAVFORMAT_VERSION_INT > ((51<<16)+(43<<8)+0))
 	/* ape codec returns silly numbers */
-	if (priv->codec->id == CODEC_ID_APE)
+	if (priv->codec->id == AV_CODEC_ID_APE)
 		return -1;
 #endif
 	if (priv->input->curr_duration > 0) {
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