ffmpeg: fix usage of -shortest in codec copy scenarios

Don't mark all streams as finished, instead make sync_opts keep track of the
stream's duration, and set recording_time to it, same as in transcoding paths.

Fixes tickets #9512 and #9513.

Signed-off-by: James Almer <jamrial@gmail.com>

fftools/ffmpeg.c

@@ -871,10 +871,11 @@ static void write_packet(OutputFile *of, AVPacket *pkt, OutputStream *ost, int u
 static void close_output_stream(OutputStream *ost)
 {
     OutputFile *of = output_files[ost->file_index];
+    AVRational time_base = ost->stream_copy ? ost->mux_timebase : ost->enc_ctx->time_base;
 
     ost->finished |= ENCODER_FINISHED;
     if (of->shortest) {
-        int64_t end = av_rescale_q(ost->sync_opts - ost->first_pts, ost->enc_ctx->time_base, AV_TIME_BASE_Q);
+        int64_t end = av_rescale_q(ost->sync_opts - ost->first_pts, time_base, AV_TIME_BASE_Q);
         of->recording_time = FFMIN(of->recording_time, end);
     }
 }
@@ -1483,13 +1484,13 @@ static void do_video_stats(OutputStream *ost, int frame_size)
 static void finish_output_stream(OutputStream *ost)
 {
     OutputFile *of = output_files[ost->file_index];
-    int i;
+    AVRational time_base = ost->stream_copy ? ost->mux_timebase : ost->enc_ctx->time_base;
 
     ost->finished = ENCODER_FINISHED | MUXER_FINISHED;
 
     if (of->shortest) {
-        for (i = 0; i < of->ctx->nb_streams; i++)
-            output_streams[of->ost_index + i]->finished = ENCODER_FINISHED | MUXER_FINISHED;
+        int64_t end = av_rescale_q(ost->sync_opts - ost->first_pts, time_base, AV_TIME_BASE_Q);
+        of->recording_time = FFMIN(of->recording_time, end);
     }
 }
 
@@ -2086,10 +2087,6 @@ static void do_streamcopy(InputStream *ist, OutputStream *ost, const AVPacket *p
         }
     }
 
-    /* force the input stream PTS */
-    if (ost->enc_ctx->codec_type == AVMEDIA_TYPE_VIDEO)
-        ost->sync_opts++;
-
     if (av_packet_ref(opkt, pkt) < 0)
         exit_program(1);
 
@@ -2113,6 +2110,8 @@ static void do_streamcopy(InputStream *ist, OutputStream *ost, const AVPacket *p
 
     opkt->duration = av_rescale_q(pkt->duration, ist->st->time_base, ost->mux_timebase);
 
+    ost->sync_opts += opkt->duration;
+
     output_packet(of, opkt, ost, 0);
 }