align and correct messages regarding bitstream filters

The messages regarding the recommended use of bitstream filters are somewhat different.
This also adds the ":v" stream specifier to "-bsf h264_mp4toannexb".

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavformat/flvenc.c

@@ -521,7 +521,7 @@ static int flv_write_packet(AVFormatContext *s, AVPacket *pkt)
                (AV_RB16(pkt->data) & 0xfff0) == 0xfff0) {
         if (!s->streams[pkt->stream_index]->nb_frames) {
         av_log(s, AV_LOG_ERROR, "Malformed AAC bitstream detected: "
-               "use audio bitstream filter 'aac_adtstoasc' to fix it "
+               "use the audio bitstream filter 'aac_adtstoasc' to fix it "
                "('-bsf:a aac_adtstoasc' option with ffmpeg)\n");
         return AVERROR_INVALIDDATA;
         }

libavformat/movenc.c

@@ -3517,7 +3517,7 @@ int ff_mov_write_packet(AVFormatContext *s, AVPacket *pkt)
         (AV_RB16(pkt->data) & 0xfff0) == 0xfff0) {
         if (!s->streams[pkt->stream_index]->nb_frames) {
             av_log(s, AV_LOG_ERROR, "Malformed AAC bitstream detected: "
-                   "use audio bitstream filter 'aac_adtstoasc' to fix it "
+                   "use the audio bitstream filter 'aac_adtstoasc' to fix it "
                    "('-bsf:a aac_adtstoasc' option with ffmpeg)\n");
             return -1;
         }

libavformat/mpegtsenc.c

@@ -1193,7 +1193,8 @@ int ff_check_h264_startcode(AVFormatContext *s, const AVStream *st, const AVPack
     if (pkt->size < 5 || AV_RB32(pkt->data) != 0x0000001) {
         if (!st->nb_frames) {
             av_log(s, AV_LOG_ERROR, "H.264 bitstream malformed, "
-                   "no startcode found, use the h264_mp4toannexb bitstream filter (-bsf h264_mp4toannexb)\n");
+                   "no startcode found, use the video bitstream filter 'h264_mp4toannexb' to fix it "
+                   "('-bsf:v h264_mp4toannexb' option with ffmpeg)\n");
             return AVERROR_INVALIDDATA;
         }
         av_log(s, AV_LOG_WARNING, "H.264 bitstream error, startcode missing\n");