diff --git a/fftools/ffmpeg.c b/fftools/ffmpeg.c
index 6e44542776..c1070485be 100644
--- a/fftools/ffmpeg.c
+++ b/fftools/ffmpeg.c
@@ -1985,136 +1985,6 @@ static int init_input_stream(InputStream *ist, char *error, int error_len)
     return 0;
 }
 
-static int init_output_stream_streamcopy(OutputStream *ost)
-{
-    OutputFile *of = output_files[ost->file_index];
-    InputStream *ist = ost->ist;
-    InputFile *ifile = input_files[ist->file_index];
-    AVCodecParameters *par = ost->st->codecpar;
-    AVCodecContext *codec_ctx;
-    AVRational sar;
-    int i, ret;
-    uint32_t codec_tag = par->codec_tag;
-
-    av_assert0(ist && !ost->filter);
-
-    codec_ctx = avcodec_alloc_context3(NULL);
-    if (!codec_ctx)
-        return AVERROR(ENOMEM);
-
-    ret = avcodec_parameters_to_context(codec_ctx, ist->par);
-    if (ret >= 0)
-        ret = av_opt_set_dict(codec_ctx, &ost->encoder_opts);
-    if (ret < 0) {
-        av_log(ost, AV_LOG_FATAL,
-               "Error setting up codec context options.\n");
-        avcodec_free_context(&codec_ctx);
-        return ret;
-    }
-
-    ret = avcodec_parameters_from_context(par, codec_ctx);
-    avcodec_free_context(&codec_ctx);
-    if (ret < 0) {
-        av_log(ost, AV_LOG_FATAL,
-               "Error getting reference codec parameters.\n");
-        return ret;
-    }
-
-    if (!codec_tag) {
-        unsigned int codec_tag_tmp;
-        if (!of->format->codec_tag ||
-            av_codec_get_id (of->format->codec_tag, par->codec_tag) == par->codec_id ||
-            !av_codec_get_tag2(of->format->codec_tag, par->codec_id, &codec_tag_tmp))
-            codec_tag = par->codec_tag;
-    }
-
-    par->codec_tag = codec_tag;
-
-    if (!ost->frame_rate.num)
-        ost->frame_rate = ist->framerate;
-
-    if (ost->frame_rate.num)
-        ost->st->avg_frame_rate = ost->frame_rate;
-    else
-        ost->st->avg_frame_rate = ist->st->avg_frame_rate;
-
-    ret = avformat_transfer_internal_stream_timing_info(of->format, ost->st, ist->st, copy_tb);
-    if (ret < 0)
-        return ret;
-
-    // copy timebase while removing common factors
-    if (ost->st->time_base.num <= 0 || ost->st->time_base.den <= 0) {
-        if (ost->frame_rate.num)
-            ost->st->time_base = av_inv_q(ost->frame_rate);
-        else
-            ost->st->time_base = av_add_q(av_stream_get_codec_timebase(ost->st), (AVRational){0, 1});
-    }
-
-    // copy estimated duration as a hint to the muxer
-    if (ost->st->duration <= 0 && ist->st->duration > 0)
-        ost->st->duration = av_rescale_q(ist->st->duration, ist->st->time_base, ost->st->time_base);
-
-    if (!ost->copy_prior_start) {
-        ost->ts_copy_start = (of->start_time == AV_NOPTS_VALUE) ?
-                             0 : of->start_time;
-        if (copy_ts && ifile->start_time != AV_NOPTS_VALUE) {
-            ost->ts_copy_start = FFMAX(ost->ts_copy_start,
-                                       ifile->start_time + ifile->ts_offset);
-        }
-    }
-
-    if (ist->st->nb_side_data) {
-        for (i = 0; i < ist->st->nb_side_data; i++) {
-            const AVPacketSideData *sd_src = &ist->st->side_data[i];
-            uint8_t *dst_data;
-
-            dst_data = av_stream_new_side_data(ost->st, sd_src->type, sd_src->size);
-            if (!dst_data)
-                return AVERROR(ENOMEM);
-            memcpy(dst_data, sd_src->data, sd_src->size);
-        }
-    }
-
-#if FFMPEG_ROTATION_METADATA
-    if (ost->rotate_overridden) {
-        uint8_t *sd = av_stream_new_side_data(ost->st, AV_PKT_DATA_DISPLAYMATRIX,
-                                              sizeof(int32_t) * 9);
-        if (sd)
-            av_display_rotation_set((int32_t *)sd, -ost->rotate_override_value);
-    }
-#endif
-
-    switch (par->codec_type) {
-    case AVMEDIA_TYPE_AUDIO:
-        if ((par->block_align == 1 || par->block_align == 1152 || par->block_align == 576) &&
-            par->codec_id == AV_CODEC_ID_MP3)
-            par->block_align = 0;
-        if (par->codec_id == AV_CODEC_ID_AC3)
-            par->block_align = 0;
-        break;
-    case AVMEDIA_TYPE_VIDEO:
-        if (ost->frame_aspect_ratio.num) { // overridden by the -aspect cli option
-            sar =
-                av_mul_q(ost->frame_aspect_ratio,
-                         (AVRational){ par->height, par->width });
-            av_log(ost, AV_LOG_WARNING, "Overriding aspect ratio "
-                   "with stream copy may produce invalid files\n");
-            }
-        else if (ist->st->sample_aspect_ratio.num)
-            sar = ist->st->sample_aspect_ratio;
-        else
-            sar = par->sample_aspect_ratio;
-        ost->st->sample_aspect_ratio = par->sample_aspect_ratio = sar;
-        ost->st->avg_frame_rate = ist->st->avg_frame_rate;
-        ost->st->r_frame_rate = ist->st->r_frame_rate;
-        break;
-    }
-
-    ost->mux_timebase = ist->st->time_base;
-
-    return 0;
-}
-
 static int init_output_stream_nofilter(OutputStream *ost)
 {
     int ret = 0;
@@ -2124,12 +1994,6 @@ static int init_output_stream_nofilter(OutputStream *ost)
         if (ret < 0)
             return ret;
     } else {
-        if (ost->ist) {
-            ret = init_output_stream_streamcopy(ost);
-            if (ret < 0)
-                return ret;
-        }
-
         ret = of_stream_init(output_files[ost->file_index], ost);
         if (ret < 0)
             return ret;
diff --git a/fftools/ffmpeg_mux_init.c b/fftools/ffmpeg_mux_init.c
index 714315cfd0..06a6b3fd2d 100644
--- a/fftools/ffmpeg_mux_init.c
+++ b/fftools/ffmpeg_mux_init.c
@@ -37,6 +37,7 @@
 #include "libavutil/avutil.h"
 #include "libavutil/bprint.h"
 #include "libavutil/dict.h"
+#include "libavutil/display.h"
 #include "libavutil/getenv_utf8.h"
 #include "libavutil/intreadwrite.h"
 #include "libavutil/log.h"
@@ -839,6 +840,142 @@ static void new_stream_subtitle(Muxer *mux, const OptionsContext *o,
     }
 }
 
+static int streamcopy_init(const Muxer *mux, const OptionsContext *o,
+                           OutputStream *ost)
+{
+    const InputStream   *ist        = ost->ist;
+    const InputFile     *ifile      = input_files[ist->file_index];
+
+    AVCodecParameters   *par        = ost->st->codecpar;
+    uint32_t             codec_tag  = par->codec_tag;
+
+    AVCodecContext      *codec_ctx  = NULL;
+    AVDictionary        *codec_opts = NULL;
+    int ret = 0;
+
+    codec_ctx = avcodec_alloc_context3(NULL);
+    if (!codec_ctx)
+        return AVERROR(ENOMEM);
+
+    ret = avcodec_parameters_to_context(codec_ctx, ist->par);
+    if (ret >= 0)
+        ret = av_opt_set_dict(codec_ctx, &ost->encoder_opts);
+    if (ret < 0) {
+        av_log(ost, AV_LOG_FATAL,
+               "Error setting up codec context options.\n");
+        goto fail;
+    }
+
+    ret = avcodec_parameters_from_context(par, codec_ctx);
+    if (ret < 0) {
+        av_log(ost, AV_LOG_FATAL,
+               "Error getting reference codec parameters.\n");
+        goto fail;
+    }
+
+    if (!codec_tag) {
+        const struct AVCodecTag * const *ct = mux->fc->oformat->codec_tag;
+        unsigned int codec_tag_tmp;
+        if (!ct || av_codec_get_id (ct, par->codec_tag) == par->codec_id ||
+            !av_codec_get_tag2(ct, par->codec_id, &codec_tag_tmp))
+            codec_tag = par->codec_tag;
+    }
+
+    par->codec_tag = codec_tag;
+
+    if (!ost->frame_rate.num)
+        ost->frame_rate = ist->framerate;
+
+    if (ost->frame_rate.num)
+        ost->st->avg_frame_rate = ost->frame_rate;
+    else
+        ost->st->avg_frame_rate = ist->st->avg_frame_rate;
+
+    ret = avformat_transfer_internal_stream_timing_info(mux->fc->oformat,
+                                                        ost->st, ist->st, copy_tb);
+    if (ret < 0)
+        goto fail;
+
+    // copy timebase while removing common factors
+    if (ost->st->time_base.num <= 0 || ost->st->time_base.den <= 0) {
+        if (ost->frame_rate.num)
+            ost->st->time_base = av_inv_q(ost->frame_rate);
+        else
+            ost->st->time_base = av_add_q(av_stream_get_codec_timebase(ost->st), (AVRational){0, 1});
+    }
+
+    // copy estimated duration as a hint to the muxer
+    if (ost->st->duration <= 0 && ist->st->duration > 0)
+        ost->st->duration = av_rescale_q(ist->st->duration, ist->st->time_base, ost->st->time_base);
+
+    if (!ost->copy_prior_start) {
+        ost->ts_copy_start = (mux->of.start_time == AV_NOPTS_VALUE) ?
+                             0 : mux->of.start_time;
+        if (copy_ts && ifile->start_time != AV_NOPTS_VALUE) {
+            ost->ts_copy_start = FFMAX(ost->ts_copy_start,
+                                       ifile->start_time + ifile->ts_offset);
+        }
+    }
+
+    if (ist->st->nb_side_data) {
+        for (int i = 0; i < ist->st->nb_side_data; i++) {
+            const AVPacketSideData *sd_src = &ist->st->side_data[i];
+            uint8_t *dst_data;
+
+            dst_data = av_stream_new_side_data(ost->st, sd_src->type, sd_src->size);
+            if (!dst_data) {
+                ret = AVERROR(ENOMEM);
+                goto fail;
+            }
+            memcpy(dst_data, sd_src->data, sd_src->size);
+        }
+    }
+
+#if FFMPEG_ROTATION_METADATA
+    if (ost->rotate_overridden) {
+        uint8_t *sd = av_stream_new_side_data(ost->st, AV_PKT_DATA_DISPLAYMATRIX,
+                                              sizeof(int32_t) * 9);
+        if (sd)
+            av_display_rotation_set((int32_t *)sd, -ost->rotate_override_value);
+    }
+#endif
+
+    switch (par->codec_type) {
+    case AVMEDIA_TYPE_AUDIO:
+        if ((par->block_align == 1 || par->block_align == 1152 || par->block_align == 576) &&
+            par->codec_id == AV_CODEC_ID_MP3)
+            par->block_align = 0;
+        if (par->codec_id == AV_CODEC_ID_AC3)
+            par->block_align = 0;
+        break;
+    case AVMEDIA_TYPE_VIDEO: {
+        AVRational sar;
+        if (ost->frame_aspect_ratio.num) { // overridden by the -aspect cli option
+            sar =
+                av_mul_q(ost->frame_aspect_ratio,
+                         (AVRational){ par->height, par->width });
+            av_log(ost, AV_LOG_WARNING, "Overriding aspect ratio "
+                   "with stream copy may produce invalid files\n");
+            }
+        else if (ist->st->sample_aspect_ratio.num)
+            sar = ist->st->sample_aspect_ratio;
+        else
+            sar = par->sample_aspect_ratio;
+        ost->st->sample_aspect_ratio = par->sample_aspect_ratio = sar;
+        ost->st->avg_frame_rate = ist->st->avg_frame_rate;
+        ost->st->r_frame_rate = ist->st->r_frame_rate;
+        break;
+        }
+    }
+
+    ost->mux_timebase = ist->st->time_base;
+
+fail:
+    avcodec_free_context(&codec_ctx);
+    av_dict_free(&codec_opts);
+    return ret;
+}
+
 static OutputStream *ost_add(Muxer *mux, const OptionsContext *o,
                              enum AVMediaType type, InputStream *ist)
 {
@@ -1086,6 +1223,12 @@ static OutputStream *ost_add(Muxer *mux, const OptionsContext *o,
     default:                      new_stream_unknown   (mux, o, ost); break;
     }
 
+    if (ost->ist && !ost->enc) {
+        ret = streamcopy_init(mux, o, ost);
+        if (ret < 0)
+            exit_program(1);
+    }
+
     return ost;
 }
 
